1 /* 2 ** 2001 September 15 3 ** 4 ** The author disclaims copyright to this source code. In place of 5 ** a legal notice, here is a blessing: 6 ** 7 ** May you do good and not evil. 8 ** May you find forgiveness for yourself and forgive others. 9 ** May you share freely, never taking more than you give. 10 ** 11 ************************************************************************* 12 ** Main file for the SQLite library. The routines in this file 13 ** implement the programmer interface to the library. Routines in 14 ** other files are for internal use by SQLite and should not be 15 ** accessed by users of the library. 16 */ 17 #include "sqliteInt.h" 18 19 #ifdef SQLITE_ENABLE_FTS3 20 # include "fts3.h" 21 #endif 22 #ifdef SQLITE_ENABLE_RTREE 23 # include "rtree.h" 24 #endif 25 #if defined(SQLITE_ENABLE_ICU) || defined(SQLITE_ENABLE_ICU_COLLATIONS) 26 # include "sqliteicu.h" 27 #endif 28 #ifdef SQLITE_ENABLE_JSON1 29 int sqlite3Json1Init(sqlite3*); 30 #endif 31 #ifdef SQLITE_ENABLE_STMTVTAB 32 int sqlite3StmtVtabInit(sqlite3*); 33 #endif 34 #ifdef SQLITE_ENABLE_FTS5 35 int sqlite3Fts5Init(sqlite3*); 36 #endif 37 38 #ifndef SQLITE_AMALGAMATION 39 /* IMPLEMENTATION-OF: R-46656-45156 The sqlite3_version[] string constant 40 ** contains the text of SQLITE_VERSION macro. 41 */ 42 const char sqlite3_version[] = SQLITE_VERSION; 43 #endif 44 45 /* IMPLEMENTATION-OF: R-53536-42575 The sqlite3_libversion() function returns 46 ** a pointer to the to the sqlite3_version[] string constant. 47 */ 48 const char *sqlite3_libversion(void){ return sqlite3_version; } 49 50 /* IMPLEMENTATION-OF: R-25063-23286 The sqlite3_sourceid() function returns a 51 ** pointer to a string constant whose value is the same as the 52 ** SQLITE_SOURCE_ID C preprocessor macro. Except if SQLite is built using 53 ** an edited copy of the amalgamation, then the last four characters of 54 ** the hash might be different from SQLITE_SOURCE_ID. 55 */ 56 const char *sqlite3_sourceid(void){ return SQLITE_SOURCE_ID; } 57 58 /* IMPLEMENTATION-OF: R-35210-63508 The sqlite3_libversion_number() function 59 ** returns an integer equal to SQLITE_VERSION_NUMBER. 60 */ 61 int sqlite3_libversion_number(void){ return SQLITE_VERSION_NUMBER; } 62 63 /* IMPLEMENTATION-OF: R-20790-14025 The sqlite3_threadsafe() function returns 64 ** zero if and only if SQLite was compiled with mutexing code omitted due to 65 ** the SQLITE_THREADSAFE compile-time option being set to 0. 66 */ 67 int sqlite3_threadsafe(void){ return SQLITE_THREADSAFE; } 68 69 /* 70 ** When compiling the test fixture or with debugging enabled (on Win32), 71 ** this variable being set to non-zero will cause OSTRACE macros to emit 72 ** extra diagnostic information. 73 */ 74 #ifdef SQLITE_HAVE_OS_TRACE 75 # ifndef SQLITE_DEBUG_OS_TRACE 76 # define SQLITE_DEBUG_OS_TRACE 0 77 # endif 78 int sqlite3OSTrace = SQLITE_DEBUG_OS_TRACE; 79 #endif 80 81 #if !defined(SQLITE_OMIT_TRACE) && defined(SQLITE_ENABLE_IOTRACE) 82 /* 83 ** If the following function pointer is not NULL and if 84 ** SQLITE_ENABLE_IOTRACE is enabled, then messages describing 85 ** I/O active are written using this function. These messages 86 ** are intended for debugging activity only. 87 */ 88 SQLITE_API void (SQLITE_CDECL *sqlite3IoTrace)(const char*, ...) = 0; 89 #endif 90 91 /* 92 ** If the following global variable points to a string which is the 93 ** name of a directory, then that directory will be used to store 94 ** temporary files. 95 ** 96 ** See also the "PRAGMA temp_store_directory" SQL command. 97 */ 98 char *sqlite3_temp_directory = 0; 99 100 /* 101 ** If the following global variable points to a string which is the 102 ** name of a directory, then that directory will be used to store 103 ** all database files specified with a relative pathname. 104 ** 105 ** See also the "PRAGMA data_store_directory" SQL command. 106 */ 107 char *sqlite3_data_directory = 0; 108 109 /* 110 ** Initialize SQLite. 111 ** 112 ** This routine must be called to initialize the memory allocation, 113 ** VFS, and mutex subsystems prior to doing any serious work with 114 ** SQLite. But as long as you do not compile with SQLITE_OMIT_AUTOINIT 115 ** this routine will be called automatically by key routines such as 116 ** sqlite3_open(). 117 ** 118 ** This routine is a no-op except on its very first call for the process, 119 ** or for the first call after a call to sqlite3_shutdown. 120 ** 121 ** The first thread to call this routine runs the initialization to 122 ** completion. If subsequent threads call this routine before the first 123 ** thread has finished the initialization process, then the subsequent 124 ** threads must block until the first thread finishes with the initialization. 125 ** 126 ** The first thread might call this routine recursively. Recursive 127 ** calls to this routine should not block, of course. Otherwise the 128 ** initialization process would never complete. 129 ** 130 ** Let X be the first thread to enter this routine. Let Y be some other 131 ** thread. Then while the initial invocation of this routine by X is 132 ** incomplete, it is required that: 133 ** 134 ** * Calls to this routine from Y must block until the outer-most 135 ** call by X completes. 136 ** 137 ** * Recursive calls to this routine from thread X return immediately 138 ** without blocking. 139 */ 140 int sqlite3_initialize(void){ 141 MUTEX_LOGIC( sqlite3_mutex *pMaster; ) /* The main static mutex */ 142 int rc; /* Result code */ 143 #ifdef SQLITE_EXTRA_INIT 144 int bRunExtraInit = 0; /* Extra initialization needed */ 145 #endif 146 147 #ifdef SQLITE_OMIT_WSD 148 rc = sqlite3_wsd_init(4096, 24); 149 if( rc!=SQLITE_OK ){ 150 return rc; 151 } 152 #endif 153 154 /* If the following assert() fails on some obscure processor/compiler 155 ** combination, the work-around is to set the correct pointer 156 ** size at compile-time using -DSQLITE_PTRSIZE=n compile-time option */ 157 assert( SQLITE_PTRSIZE==sizeof(char*) ); 158 159 /* If SQLite is already completely initialized, then this call 160 ** to sqlite3_initialize() should be a no-op. But the initialization 161 ** must be complete. So isInit must not be set until the very end 162 ** of this routine. 163 */ 164 if( sqlite3GlobalConfig.isInit ) return SQLITE_OK; 165 166 /* Make sure the mutex subsystem is initialized. If unable to 167 ** initialize the mutex subsystem, return early with the error. 168 ** If the system is so sick that we are unable to allocate a mutex, 169 ** there is not much SQLite is going to be able to do. 170 ** 171 ** The mutex subsystem must take care of serializing its own 172 ** initialization. 173 */ 174 rc = sqlite3MutexInit(); 175 if( rc ) return rc; 176 177 /* Initialize the malloc() system and the recursive pInitMutex mutex. 178 ** This operation is protected by the STATIC_MASTER mutex. Note that 179 ** MutexAlloc() is called for a static mutex prior to initializing the 180 ** malloc subsystem - this implies that the allocation of a static 181 ** mutex must not require support from the malloc subsystem. 182 */ 183 MUTEX_LOGIC( pMaster = sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MASTER); ) 184 sqlite3_mutex_enter(pMaster); 185 sqlite3GlobalConfig.isMutexInit = 1; 186 if( !sqlite3GlobalConfig.isMallocInit ){ 187 rc = sqlite3MallocInit(); 188 } 189 if( rc==SQLITE_OK ){ 190 sqlite3GlobalConfig.isMallocInit = 1; 191 if( !sqlite3GlobalConfig.pInitMutex ){ 192 sqlite3GlobalConfig.pInitMutex = 193 sqlite3MutexAlloc(SQLITE_MUTEX_RECURSIVE); 194 if( sqlite3GlobalConfig.bCoreMutex && !sqlite3GlobalConfig.pInitMutex ){ 195 rc = SQLITE_NOMEM_BKPT; 196 } 197 } 198 } 199 if( rc==SQLITE_OK ){ 200 sqlite3GlobalConfig.nRefInitMutex++; 201 } 202 sqlite3_mutex_leave(pMaster); 203 204 /* If rc is not SQLITE_OK at this point, then either the malloc 205 ** subsystem could not be initialized or the system failed to allocate 206 ** the pInitMutex mutex. Return an error in either case. */ 207 if( rc!=SQLITE_OK ){ 208 return rc; 209 } 210 211 /* Do the rest of the initialization under the recursive mutex so 212 ** that we will be able to handle recursive calls into 213 ** sqlite3_initialize(). The recursive calls normally come through 214 ** sqlite3_os_init() when it invokes sqlite3_vfs_register(), but other 215 ** recursive calls might also be possible. 216 ** 217 ** IMPLEMENTATION-OF: R-00140-37445 SQLite automatically serializes calls 218 ** to the xInit method, so the xInit method need not be threadsafe. 219 ** 220 ** The following mutex is what serializes access to the appdef pcache xInit 221 ** methods. The sqlite3_pcache_methods.xInit() all is embedded in the 222 ** call to sqlite3PcacheInitialize(). 223 */ 224 sqlite3_mutex_enter(sqlite3GlobalConfig.pInitMutex); 225 if( sqlite3GlobalConfig.isInit==0 && sqlite3GlobalConfig.inProgress==0 ){ 226 sqlite3GlobalConfig.inProgress = 1; 227 #ifdef SQLITE_ENABLE_SQLLOG 228 { 229 extern void sqlite3_init_sqllog(void); 230 sqlite3_init_sqllog(); 231 } 232 #endif 233 memset(&sqlite3BuiltinFunctions, 0, sizeof(sqlite3BuiltinFunctions)); 234 sqlite3RegisterBuiltinFunctions(); 235 if( sqlite3GlobalConfig.isPCacheInit==0 ){ 236 rc = sqlite3PcacheInitialize(); 237 } 238 if( rc==SQLITE_OK ){ 239 sqlite3GlobalConfig.isPCacheInit = 1; 240 rc = sqlite3OsInit(); 241 } 242 #ifdef SQLITE_ENABLE_DESERIALIZE 243 if( rc==SQLITE_OK ){ 244 rc = sqlite3MemdbInit(); 245 } 246 #endif 247 if( rc==SQLITE_OK ){ 248 sqlite3PCacheBufferSetup( sqlite3GlobalConfig.pPage, 249 sqlite3GlobalConfig.szPage, sqlite3GlobalConfig.nPage); 250 sqlite3GlobalConfig.isInit = 1; 251 #ifdef SQLITE_EXTRA_INIT 252 bRunExtraInit = 1; 253 #endif 254 } 255 sqlite3GlobalConfig.inProgress = 0; 256 } 257 sqlite3_mutex_leave(sqlite3GlobalConfig.pInitMutex); 258 259 /* Go back under the static mutex and clean up the recursive 260 ** mutex to prevent a resource leak. 261 */ 262 sqlite3_mutex_enter(pMaster); 263 sqlite3GlobalConfig.nRefInitMutex--; 264 if( sqlite3GlobalConfig.nRefInitMutex<=0 ){ 265 assert( sqlite3GlobalConfig.nRefInitMutex==0 ); 266 sqlite3_mutex_free(sqlite3GlobalConfig.pInitMutex); 267 sqlite3GlobalConfig.pInitMutex = 0; 268 } 269 sqlite3_mutex_leave(pMaster); 270 271 /* The following is just a sanity check to make sure SQLite has 272 ** been compiled correctly. It is important to run this code, but 273 ** we don't want to run it too often and soak up CPU cycles for no 274 ** reason. So we run it once during initialization. 275 */ 276 #ifndef NDEBUG 277 #ifndef SQLITE_OMIT_FLOATING_POINT 278 /* This section of code's only "output" is via assert() statements. */ 279 if( rc==SQLITE_OK ){ 280 u64 x = (((u64)1)<<63)-1; 281 double y; 282 assert(sizeof(x)==8); 283 assert(sizeof(x)==sizeof(y)); 284 memcpy(&y, &x, 8); 285 assert( sqlite3IsNaN(y) ); 286 } 287 #endif 288 #endif 289 290 /* Do extra initialization steps requested by the SQLITE_EXTRA_INIT 291 ** compile-time option. 292 */ 293 #ifdef SQLITE_EXTRA_INIT 294 if( bRunExtraInit ){ 295 int SQLITE_EXTRA_INIT(const char*); 296 rc = SQLITE_EXTRA_INIT(0); 297 } 298 #endif 299 300 return rc; 301 } 302 303 /* 304 ** Undo the effects of sqlite3_initialize(). Must not be called while 305 ** there are outstanding database connections or memory allocations or 306 ** while any part of SQLite is otherwise in use in any thread. This 307 ** routine is not threadsafe. But it is safe to invoke this routine 308 ** on when SQLite is already shut down. If SQLite is already shut down 309 ** when this routine is invoked, then this routine is a harmless no-op. 310 */ 311 int sqlite3_shutdown(void){ 312 #ifdef SQLITE_OMIT_WSD 313 int rc = sqlite3_wsd_init(4096, 24); 314 if( rc!=SQLITE_OK ){ 315 return rc; 316 } 317 #endif 318 319 if( sqlite3GlobalConfig.isInit ){ 320 #ifdef SQLITE_EXTRA_SHUTDOWN 321 void SQLITE_EXTRA_SHUTDOWN(void); 322 SQLITE_EXTRA_SHUTDOWN(); 323 #endif 324 sqlite3_os_end(); 325 sqlite3_reset_auto_extension(); 326 sqlite3GlobalConfig.isInit = 0; 327 } 328 if( sqlite3GlobalConfig.isPCacheInit ){ 329 sqlite3PcacheShutdown(); 330 sqlite3GlobalConfig.isPCacheInit = 0; 331 } 332 if( sqlite3GlobalConfig.isMallocInit ){ 333 sqlite3MallocEnd(); 334 sqlite3GlobalConfig.isMallocInit = 0; 335 336 #ifndef SQLITE_OMIT_SHUTDOWN_DIRECTORIES 337 /* The heap subsystem has now been shutdown and these values are supposed 338 ** to be NULL or point to memory that was obtained from sqlite3_malloc(), 339 ** which would rely on that heap subsystem; therefore, make sure these 340 ** values cannot refer to heap memory that was just invalidated when the 341 ** heap subsystem was shutdown. This is only done if the current call to 342 ** this function resulted in the heap subsystem actually being shutdown. 343 */ 344 sqlite3_data_directory = 0; 345 sqlite3_temp_directory = 0; 346 #endif 347 } 348 if( sqlite3GlobalConfig.isMutexInit ){ 349 sqlite3MutexEnd(); 350 sqlite3GlobalConfig.isMutexInit = 0; 351 } 352 353 return SQLITE_OK; 354 } 355 356 /* 357 ** This API allows applications to modify the global configuration of 358 ** the SQLite library at run-time. 359 ** 360 ** This routine should only be called when there are no outstanding 361 ** database connections or memory allocations. This routine is not 362 ** threadsafe. Failure to heed these warnings can lead to unpredictable 363 ** behavior. 364 */ 365 int sqlite3_config(int op, ...){ 366 va_list ap; 367 int rc = SQLITE_OK; 368 369 /* sqlite3_config() shall return SQLITE_MISUSE if it is invoked while 370 ** the SQLite library is in use. */ 371 if( sqlite3GlobalConfig.isInit ) return SQLITE_MISUSE_BKPT; 372 373 va_start(ap, op); 374 switch( op ){ 375 376 /* Mutex configuration options are only available in a threadsafe 377 ** compile. 378 */ 379 #if defined(SQLITE_THREADSAFE) && SQLITE_THREADSAFE>0 /* IMP: R-54466-46756 */ 380 case SQLITE_CONFIG_SINGLETHREAD: { 381 /* EVIDENCE-OF: R-02748-19096 This option sets the threading mode to 382 ** Single-thread. */ 383 sqlite3GlobalConfig.bCoreMutex = 0; /* Disable mutex on core */ 384 sqlite3GlobalConfig.bFullMutex = 0; /* Disable mutex on connections */ 385 break; 386 } 387 #endif 388 #if defined(SQLITE_THREADSAFE) && SQLITE_THREADSAFE>0 /* IMP: R-20520-54086 */ 389 case SQLITE_CONFIG_MULTITHREAD: { 390 /* EVIDENCE-OF: R-14374-42468 This option sets the threading mode to 391 ** Multi-thread. */ 392 sqlite3GlobalConfig.bCoreMutex = 1; /* Enable mutex on core */ 393 sqlite3GlobalConfig.bFullMutex = 0; /* Disable mutex on connections */ 394 break; 395 } 396 #endif 397 #if defined(SQLITE_THREADSAFE) && SQLITE_THREADSAFE>0 /* IMP: R-59593-21810 */ 398 case SQLITE_CONFIG_SERIALIZED: { 399 /* EVIDENCE-OF: R-41220-51800 This option sets the threading mode to 400 ** Serialized. */ 401 sqlite3GlobalConfig.bCoreMutex = 1; /* Enable mutex on core */ 402 sqlite3GlobalConfig.bFullMutex = 1; /* Enable mutex on connections */ 403 break; 404 } 405 #endif 406 #if defined(SQLITE_THREADSAFE) && SQLITE_THREADSAFE>0 /* IMP: R-63666-48755 */ 407 case SQLITE_CONFIG_MUTEX: { 408 /* Specify an alternative mutex implementation */ 409 sqlite3GlobalConfig.mutex = *va_arg(ap, sqlite3_mutex_methods*); 410 break; 411 } 412 #endif 413 #if defined(SQLITE_THREADSAFE) && SQLITE_THREADSAFE>0 /* IMP: R-14450-37597 */ 414 case SQLITE_CONFIG_GETMUTEX: { 415 /* Retrieve the current mutex implementation */ 416 *va_arg(ap, sqlite3_mutex_methods*) = sqlite3GlobalConfig.mutex; 417 break; 418 } 419 #endif 420 421 case SQLITE_CONFIG_MALLOC: { 422 /* EVIDENCE-OF: R-55594-21030 The SQLITE_CONFIG_MALLOC option takes a 423 ** single argument which is a pointer to an instance of the 424 ** sqlite3_mem_methods structure. The argument specifies alternative 425 ** low-level memory allocation routines to be used in place of the memory 426 ** allocation routines built into SQLite. */ 427 sqlite3GlobalConfig.m = *va_arg(ap, sqlite3_mem_methods*); 428 break; 429 } 430 case SQLITE_CONFIG_GETMALLOC: { 431 /* EVIDENCE-OF: R-51213-46414 The SQLITE_CONFIG_GETMALLOC option takes a 432 ** single argument which is a pointer to an instance of the 433 ** sqlite3_mem_methods structure. The sqlite3_mem_methods structure is 434 ** filled with the currently defined memory allocation routines. */ 435 if( sqlite3GlobalConfig.m.xMalloc==0 ) sqlite3MemSetDefault(); 436 *va_arg(ap, sqlite3_mem_methods*) = sqlite3GlobalConfig.m; 437 break; 438 } 439 case SQLITE_CONFIG_MEMSTATUS: { 440 /* EVIDENCE-OF: R-61275-35157 The SQLITE_CONFIG_MEMSTATUS option takes 441 ** single argument of type int, interpreted as a boolean, which enables 442 ** or disables the collection of memory allocation statistics. */ 443 sqlite3GlobalConfig.bMemstat = va_arg(ap, int); 444 break; 445 } 446 case SQLITE_CONFIG_SMALL_MALLOC: { 447 sqlite3GlobalConfig.bSmallMalloc = va_arg(ap, int); 448 break; 449 } 450 case SQLITE_CONFIG_PAGECACHE: { 451 /* EVIDENCE-OF: R-18761-36601 There are three arguments to 452 ** SQLITE_CONFIG_PAGECACHE: A pointer to 8-byte aligned memory (pMem), 453 ** the size of each page cache line (sz), and the number of cache lines 454 ** (N). */ 455 sqlite3GlobalConfig.pPage = va_arg(ap, void*); 456 sqlite3GlobalConfig.szPage = va_arg(ap, int); 457 sqlite3GlobalConfig.nPage = va_arg(ap, int); 458 break; 459 } 460 case SQLITE_CONFIG_PCACHE_HDRSZ: { 461 /* EVIDENCE-OF: R-39100-27317 The SQLITE_CONFIG_PCACHE_HDRSZ option takes 462 ** a single parameter which is a pointer to an integer and writes into 463 ** that integer the number of extra bytes per page required for each page 464 ** in SQLITE_CONFIG_PAGECACHE. */ 465 *va_arg(ap, int*) = 466 sqlite3HeaderSizeBtree() + 467 sqlite3HeaderSizePcache() + 468 sqlite3HeaderSizePcache1(); 469 break; 470 } 471 472 case SQLITE_CONFIG_PCACHE: { 473 /* no-op */ 474 break; 475 } 476 case SQLITE_CONFIG_GETPCACHE: { 477 /* now an error */ 478 rc = SQLITE_ERROR; 479 break; 480 } 481 482 case SQLITE_CONFIG_PCACHE2: { 483 /* EVIDENCE-OF: R-63325-48378 The SQLITE_CONFIG_PCACHE2 option takes a 484 ** single argument which is a pointer to an sqlite3_pcache_methods2 485 ** object. This object specifies the interface to a custom page cache 486 ** implementation. */ 487 sqlite3GlobalConfig.pcache2 = *va_arg(ap, sqlite3_pcache_methods2*); 488 break; 489 } 490 case SQLITE_CONFIG_GETPCACHE2: { 491 /* EVIDENCE-OF: R-22035-46182 The SQLITE_CONFIG_GETPCACHE2 option takes a 492 ** single argument which is a pointer to an sqlite3_pcache_methods2 493 ** object. SQLite copies of the current page cache implementation into 494 ** that object. */ 495 if( sqlite3GlobalConfig.pcache2.xInit==0 ){ 496 sqlite3PCacheSetDefault(); 497 } 498 *va_arg(ap, sqlite3_pcache_methods2*) = sqlite3GlobalConfig.pcache2; 499 break; 500 } 501 502 /* EVIDENCE-OF: R-06626-12911 The SQLITE_CONFIG_HEAP option is only 503 ** available if SQLite is compiled with either SQLITE_ENABLE_MEMSYS3 or 504 ** SQLITE_ENABLE_MEMSYS5 and returns SQLITE_ERROR if invoked otherwise. */ 505 #if defined(SQLITE_ENABLE_MEMSYS3) || defined(SQLITE_ENABLE_MEMSYS5) 506 case SQLITE_CONFIG_HEAP: { 507 /* EVIDENCE-OF: R-19854-42126 There are three arguments to 508 ** SQLITE_CONFIG_HEAP: An 8-byte aligned pointer to the memory, the 509 ** number of bytes in the memory buffer, and the minimum allocation size. 510 */ 511 sqlite3GlobalConfig.pHeap = va_arg(ap, void*); 512 sqlite3GlobalConfig.nHeap = va_arg(ap, int); 513 sqlite3GlobalConfig.mnReq = va_arg(ap, int); 514 515 if( sqlite3GlobalConfig.mnReq<1 ){ 516 sqlite3GlobalConfig.mnReq = 1; 517 }else if( sqlite3GlobalConfig.mnReq>(1<<12) ){ 518 /* cap min request size at 2^12 */ 519 sqlite3GlobalConfig.mnReq = (1<<12); 520 } 521 522 if( sqlite3GlobalConfig.pHeap==0 ){ 523 /* EVIDENCE-OF: R-49920-60189 If the first pointer (the memory pointer) 524 ** is NULL, then SQLite reverts to using its default memory allocator 525 ** (the system malloc() implementation), undoing any prior invocation of 526 ** SQLITE_CONFIG_MALLOC. 527 ** 528 ** Setting sqlite3GlobalConfig.m to all zeros will cause malloc to 529 ** revert to its default implementation when sqlite3_initialize() is run 530 */ 531 memset(&sqlite3GlobalConfig.m, 0, sizeof(sqlite3GlobalConfig.m)); 532 }else{ 533 /* EVIDENCE-OF: R-61006-08918 If the memory pointer is not NULL then the 534 ** alternative memory allocator is engaged to handle all of SQLites 535 ** memory allocation needs. */ 536 #ifdef SQLITE_ENABLE_MEMSYS3 537 sqlite3GlobalConfig.m = *sqlite3MemGetMemsys3(); 538 #endif 539 #ifdef SQLITE_ENABLE_MEMSYS5 540 sqlite3GlobalConfig.m = *sqlite3MemGetMemsys5(); 541 #endif 542 } 543 break; 544 } 545 #endif 546 547 case SQLITE_CONFIG_LOOKASIDE: { 548 sqlite3GlobalConfig.szLookaside = va_arg(ap, int); 549 sqlite3GlobalConfig.nLookaside = va_arg(ap, int); 550 break; 551 } 552 553 /* Record a pointer to the logger function and its first argument. 554 ** The default is NULL. Logging is disabled if the function pointer is 555 ** NULL. 556 */ 557 case SQLITE_CONFIG_LOG: { 558 /* MSVC is picky about pulling func ptrs from va lists. 559 ** http://support.microsoft.com/kb/47961 560 ** sqlite3GlobalConfig.xLog = va_arg(ap, void(*)(void*,int,const char*)); 561 */ 562 typedef void(*LOGFUNC_t)(void*,int,const char*); 563 sqlite3GlobalConfig.xLog = va_arg(ap, LOGFUNC_t); 564 sqlite3GlobalConfig.pLogArg = va_arg(ap, void*); 565 break; 566 } 567 568 /* EVIDENCE-OF: R-55548-33817 The compile-time setting for URI filenames 569 ** can be changed at start-time using the 570 ** sqlite3_config(SQLITE_CONFIG_URI,1) or 571 ** sqlite3_config(SQLITE_CONFIG_URI,0) configuration calls. 572 */ 573 case SQLITE_CONFIG_URI: { 574 /* EVIDENCE-OF: R-25451-61125 The SQLITE_CONFIG_URI option takes a single 575 ** argument of type int. If non-zero, then URI handling is globally 576 ** enabled. If the parameter is zero, then URI handling is globally 577 ** disabled. */ 578 sqlite3GlobalConfig.bOpenUri = va_arg(ap, int); 579 break; 580 } 581 582 case SQLITE_CONFIG_COVERING_INDEX_SCAN: { 583 /* EVIDENCE-OF: R-36592-02772 The SQLITE_CONFIG_COVERING_INDEX_SCAN 584 ** option takes a single integer argument which is interpreted as a 585 ** boolean in order to enable or disable the use of covering indices for 586 ** full table scans in the query optimizer. */ 587 sqlite3GlobalConfig.bUseCis = va_arg(ap, int); 588 break; 589 } 590 591 #ifdef SQLITE_ENABLE_SQLLOG 592 case SQLITE_CONFIG_SQLLOG: { 593 typedef void(*SQLLOGFUNC_t)(void*, sqlite3*, const char*, int); 594 sqlite3GlobalConfig.xSqllog = va_arg(ap, SQLLOGFUNC_t); 595 sqlite3GlobalConfig.pSqllogArg = va_arg(ap, void *); 596 break; 597 } 598 #endif 599 600 case SQLITE_CONFIG_MMAP_SIZE: { 601 /* EVIDENCE-OF: R-58063-38258 SQLITE_CONFIG_MMAP_SIZE takes two 64-bit 602 ** integer (sqlite3_int64) values that are the default mmap size limit 603 ** (the default setting for PRAGMA mmap_size) and the maximum allowed 604 ** mmap size limit. */ 605 sqlite3_int64 szMmap = va_arg(ap, sqlite3_int64); 606 sqlite3_int64 mxMmap = va_arg(ap, sqlite3_int64); 607 /* EVIDENCE-OF: R-53367-43190 If either argument to this option is 608 ** negative, then that argument is changed to its compile-time default. 609 ** 610 ** EVIDENCE-OF: R-34993-45031 The maximum allowed mmap size will be 611 ** silently truncated if necessary so that it does not exceed the 612 ** compile-time maximum mmap size set by the SQLITE_MAX_MMAP_SIZE 613 ** compile-time option. 614 */ 615 if( mxMmap<0 || mxMmap>SQLITE_MAX_MMAP_SIZE ){ 616 mxMmap = SQLITE_MAX_MMAP_SIZE; 617 } 618 if( szMmap<0 ) szMmap = SQLITE_DEFAULT_MMAP_SIZE; 619 if( szMmap>mxMmap) szMmap = mxMmap; 620 sqlite3GlobalConfig.mxMmap = mxMmap; 621 sqlite3GlobalConfig.szMmap = szMmap; 622 break; 623 } 624 625 #if SQLITE_OS_WIN && defined(SQLITE_WIN32_MALLOC) /* IMP: R-04780-55815 */ 626 case SQLITE_CONFIG_WIN32_HEAPSIZE: { 627 /* EVIDENCE-OF: R-34926-03360 SQLITE_CONFIG_WIN32_HEAPSIZE takes a 32-bit 628 ** unsigned integer value that specifies the maximum size of the created 629 ** heap. */ 630 sqlite3GlobalConfig.nHeap = va_arg(ap, int); 631 break; 632 } 633 #endif 634 635 case SQLITE_CONFIG_PMASZ: { 636 sqlite3GlobalConfig.szPma = va_arg(ap, unsigned int); 637 break; 638 } 639 640 case SQLITE_CONFIG_STMTJRNL_SPILL: { 641 sqlite3GlobalConfig.nStmtSpill = va_arg(ap, int); 642 break; 643 } 644 645 #ifdef SQLITE_ENABLE_SORTER_REFERENCES 646 case SQLITE_CONFIG_SORTERREF_SIZE: { 647 int iVal = va_arg(ap, int); 648 if( iVal<0 ){ 649 iVal = SQLITE_DEFAULT_SORTERREF_SIZE; 650 } 651 sqlite3GlobalConfig.szSorterRef = (u32)iVal; 652 break; 653 } 654 #endif /* SQLITE_ENABLE_SORTER_REFERENCES */ 655 656 #ifdef SQLITE_ENABLE_DESERIALIZE 657 case SQLITE_CONFIG_MEMDB_MAXSIZE: { 658 sqlite3GlobalConfig.mxMemdbSize = va_arg(ap, sqlite3_int64); 659 break; 660 } 661 #endif /* SQLITE_ENABLE_DESERIALIZE */ 662 663 default: { 664 rc = SQLITE_ERROR; 665 break; 666 } 667 } 668 va_end(ap); 669 return rc; 670 } 671 672 /* 673 ** Set up the lookaside buffers for a database connection. 674 ** Return SQLITE_OK on success. 675 ** If lookaside is already active, return SQLITE_BUSY. 676 ** 677 ** The sz parameter is the number of bytes in each lookaside slot. 678 ** The cnt parameter is the number of slots. If pStart is NULL the 679 ** space for the lookaside memory is obtained from sqlite3_malloc(). 680 ** If pStart is not NULL then it is sz*cnt bytes of memory to use for 681 ** the lookaside memory. 682 */ 683 static int setupLookaside(sqlite3 *db, void *pBuf, int sz, int cnt){ 684 #ifndef SQLITE_OMIT_LOOKASIDE 685 void *pStart; 686 687 if( sqlite3LookasideUsed(db,0)>0 ){ 688 return SQLITE_BUSY; 689 } 690 /* Free any existing lookaside buffer for this handle before 691 ** allocating a new one so we don't have to have space for 692 ** both at the same time. 693 */ 694 if( db->lookaside.bMalloced ){ 695 sqlite3_free(db->lookaside.pStart); 696 } 697 /* The size of a lookaside slot after ROUNDDOWN8 needs to be larger 698 ** than a pointer to be useful. 699 */ 700 sz = ROUNDDOWN8(sz); /* IMP: R-33038-09382 */ 701 if( sz<=(int)sizeof(LookasideSlot*) ) sz = 0; 702 if( cnt<0 ) cnt = 0; 703 if( sz==0 || cnt==0 ){ 704 sz = 0; 705 pStart = 0; 706 }else if( pBuf==0 ){ 707 sqlite3BeginBenignMalloc(); 708 pStart = sqlite3Malloc( sz*(sqlite3_int64)cnt ); /* IMP: R-61949-35727 */ 709 sqlite3EndBenignMalloc(); 710 if( pStart ) cnt = sqlite3MallocSize(pStart)/sz; 711 }else{ 712 pStart = pBuf; 713 } 714 db->lookaside.pStart = pStart; 715 db->lookaside.pInit = 0; 716 db->lookaside.pFree = 0; 717 db->lookaside.sz = (u16)sz; 718 db->lookaside.szTrue = (u16)sz; 719 if( pStart ){ 720 int i; 721 LookasideSlot *p; 722 assert( sz > (int)sizeof(LookasideSlot*) ); 723 db->lookaside.nSlot = cnt; 724 p = (LookasideSlot*)pStart; 725 for(i=cnt-1; i>=0; i--){ 726 p->pNext = db->lookaside.pInit; 727 db->lookaside.pInit = p; 728 p = (LookasideSlot*)&((u8*)p)[sz]; 729 } 730 db->lookaside.pEnd = p; 731 db->lookaside.bDisable = 0; 732 db->lookaside.bMalloced = pBuf==0 ?1:0; 733 }else{ 734 db->lookaside.pStart = db; 735 db->lookaside.pEnd = db; 736 db->lookaside.bDisable = 1; 737 db->lookaside.sz = 0; 738 db->lookaside.bMalloced = 0; 739 db->lookaside.nSlot = 0; 740 } 741 #endif /* SQLITE_OMIT_LOOKASIDE */ 742 return SQLITE_OK; 743 } 744 745 /* 746 ** Return the mutex associated with a database connection. 747 */ 748 sqlite3_mutex *sqlite3_db_mutex(sqlite3 *db){ 749 #ifdef SQLITE_ENABLE_API_ARMOR 750 if( !sqlite3SafetyCheckOk(db) ){ 751 (void)SQLITE_MISUSE_BKPT; 752 return 0; 753 } 754 #endif 755 return db->mutex; 756 } 757 758 /* 759 ** Free up as much memory as we can from the given database 760 ** connection. 761 */ 762 int sqlite3_db_release_memory(sqlite3 *db){ 763 int i; 764 765 #ifdef SQLITE_ENABLE_API_ARMOR 766 if( !sqlite3SafetyCheckOk(db) ) return SQLITE_MISUSE_BKPT; 767 #endif 768 sqlite3_mutex_enter(db->mutex); 769 sqlite3BtreeEnterAll(db); 770 for(i=0; i<db->nDb; i++){ 771 Btree *pBt = db->aDb[i].pBt; 772 if( pBt ){ 773 Pager *pPager = sqlite3BtreePager(pBt); 774 sqlite3PagerShrink(pPager); 775 } 776 } 777 sqlite3BtreeLeaveAll(db); 778 sqlite3_mutex_leave(db->mutex); 779 return SQLITE_OK; 780 } 781 782 /* 783 ** Flush any dirty pages in the pager-cache for any attached database 784 ** to disk. 785 */ 786 int sqlite3_db_cacheflush(sqlite3 *db){ 787 int i; 788 int rc = SQLITE_OK; 789 int bSeenBusy = 0; 790 791 #ifdef SQLITE_ENABLE_API_ARMOR 792 if( !sqlite3SafetyCheckOk(db) ) return SQLITE_MISUSE_BKPT; 793 #endif 794 sqlite3_mutex_enter(db->mutex); 795 sqlite3BtreeEnterAll(db); 796 for(i=0; rc==SQLITE_OK && i<db->nDb; i++){ 797 Btree *pBt = db->aDb[i].pBt; 798 if( pBt && sqlite3BtreeIsInTrans(pBt) ){ 799 Pager *pPager = sqlite3BtreePager(pBt); 800 rc = sqlite3PagerFlush(pPager); 801 if( rc==SQLITE_BUSY ){ 802 bSeenBusy = 1; 803 rc = SQLITE_OK; 804 } 805 } 806 } 807 sqlite3BtreeLeaveAll(db); 808 sqlite3_mutex_leave(db->mutex); 809 return ((rc==SQLITE_OK && bSeenBusy) ? SQLITE_BUSY : rc); 810 } 811 812 /* 813 ** Configuration settings for an individual database connection 814 */ 815 int sqlite3_db_config(sqlite3 *db, int op, ...){ 816 va_list ap; 817 int rc; 818 va_start(ap, op); 819 switch( op ){ 820 case SQLITE_DBCONFIG_MAINDBNAME: { 821 /* IMP: R-06824-28531 */ 822 /* IMP: R-36257-52125 */ 823 db->aDb[0].zDbSName = va_arg(ap,char*); 824 rc = SQLITE_OK; 825 break; 826 } 827 case SQLITE_DBCONFIG_LOOKASIDE: { 828 void *pBuf = va_arg(ap, void*); /* IMP: R-26835-10964 */ 829 int sz = va_arg(ap, int); /* IMP: R-47871-25994 */ 830 int cnt = va_arg(ap, int); /* IMP: R-04460-53386 */ 831 rc = setupLookaside(db, pBuf, sz, cnt); 832 break; 833 } 834 default: { 835 static const struct { 836 int op; /* The opcode */ 837 u32 mask; /* Mask of the bit in sqlite3.flags to set/clear */ 838 } aFlagOp[] = { 839 { SQLITE_DBCONFIG_ENABLE_FKEY, SQLITE_ForeignKeys }, 840 { SQLITE_DBCONFIG_ENABLE_TRIGGER, SQLITE_EnableTrigger }, 841 { SQLITE_DBCONFIG_ENABLE_VIEW, SQLITE_EnableView }, 842 { SQLITE_DBCONFIG_ENABLE_FTS3_TOKENIZER, SQLITE_Fts3Tokenizer }, 843 { SQLITE_DBCONFIG_ENABLE_LOAD_EXTENSION, SQLITE_LoadExtension }, 844 { SQLITE_DBCONFIG_NO_CKPT_ON_CLOSE, SQLITE_NoCkptOnClose }, 845 { SQLITE_DBCONFIG_ENABLE_QPSG, SQLITE_EnableQPSG }, 846 { SQLITE_DBCONFIG_TRIGGER_EQP, SQLITE_TriggerEQP }, 847 { SQLITE_DBCONFIG_RESET_DATABASE, SQLITE_ResetDatabase }, 848 { SQLITE_DBCONFIG_DEFENSIVE, SQLITE_Defensive }, 849 { SQLITE_DBCONFIG_WRITABLE_SCHEMA, SQLITE_WriteSchema| 850 SQLITE_NoSchemaError }, 851 { SQLITE_DBCONFIG_LEGACY_ALTER_TABLE, SQLITE_LegacyAlter }, 852 { SQLITE_DBCONFIG_DQS_DDL, SQLITE_DqsDDL }, 853 { SQLITE_DBCONFIG_DQS_DML, SQLITE_DqsDML }, 854 }; 855 unsigned int i; 856 rc = SQLITE_ERROR; /* IMP: R-42790-23372 */ 857 for(i=0; i<ArraySize(aFlagOp); i++){ 858 if( aFlagOp[i].op==op ){ 859 int onoff = va_arg(ap, int); 860 int *pRes = va_arg(ap, int*); 861 u64 oldFlags = db->flags; 862 if( onoff>0 ){ 863 db->flags |= aFlagOp[i].mask; 864 }else if( onoff==0 ){ 865 db->flags &= ~(u64)aFlagOp[i].mask; 866 } 867 if( oldFlags!=db->flags ){ 868 sqlite3ExpirePreparedStatements(db, 0); 869 } 870 if( pRes ){ 871 *pRes = (db->flags & aFlagOp[i].mask)!=0; 872 } 873 rc = SQLITE_OK; 874 break; 875 } 876 } 877 break; 878 } 879 } 880 va_end(ap); 881 return rc; 882 } 883 884 /* 885 ** This is the default collating function named "BINARY" which is always 886 ** available. 887 */ 888 static int binCollFunc( 889 void *NotUsed, 890 int nKey1, const void *pKey1, 891 int nKey2, const void *pKey2 892 ){ 893 int rc, n; 894 UNUSED_PARAMETER(NotUsed); 895 n = nKey1<nKey2 ? nKey1 : nKey2; 896 /* EVIDENCE-OF: R-65033-28449 The built-in BINARY collation compares 897 ** strings byte by byte using the memcmp() function from the standard C 898 ** library. */ 899 assert( pKey1 && pKey2 ); 900 rc = memcmp(pKey1, pKey2, n); 901 if( rc==0 ){ 902 rc = nKey1 - nKey2; 903 } 904 return rc; 905 } 906 907 /* 908 ** This is the collating function named "RTRIM" which is always 909 ** available. Ignore trailing spaces. 910 */ 911 static int rtrimCollFunc( 912 void *pUser, 913 int nKey1, const void *pKey1, 914 int nKey2, const void *pKey2 915 ){ 916 const u8 *pK1 = (const u8*)pKey1; 917 const u8 *pK2 = (const u8*)pKey2; 918 while( nKey1 && pK1[nKey1-1]==' ' ) nKey1--; 919 while( nKey2 && pK2[nKey2-1]==' ' ) nKey2--; 920 return binCollFunc(pUser, nKey1, pKey1, nKey2, pKey2); 921 } 922 923 /* 924 ** Return true if CollSeq is the default built-in BINARY. 925 */ 926 int sqlite3IsBinary(const CollSeq *p){ 927 assert( p==0 || p->xCmp!=binCollFunc || strcmp(p->zName,"BINARY")==0 ); 928 return p==0 || p->xCmp==binCollFunc; 929 } 930 931 /* 932 ** Another built-in collating sequence: NOCASE. 933 ** 934 ** This collating sequence is intended to be used for "case independent 935 ** comparison". SQLite's knowledge of upper and lower case equivalents 936 ** extends only to the 26 characters used in the English language. 937 ** 938 ** At the moment there is only a UTF-8 implementation. 939 */ 940 static int nocaseCollatingFunc( 941 void *NotUsed, 942 int nKey1, const void *pKey1, 943 int nKey2, const void *pKey2 944 ){ 945 int r = sqlite3StrNICmp( 946 (const char *)pKey1, (const char *)pKey2, (nKey1<nKey2)?nKey1:nKey2); 947 UNUSED_PARAMETER(NotUsed); 948 if( 0==r ){ 949 r = nKey1-nKey2; 950 } 951 return r; 952 } 953 954 /* 955 ** Return the ROWID of the most recent insert 956 */ 957 sqlite_int64 sqlite3_last_insert_rowid(sqlite3 *db){ 958 #ifdef SQLITE_ENABLE_API_ARMOR 959 if( !sqlite3SafetyCheckOk(db) ){ 960 (void)SQLITE_MISUSE_BKPT; 961 return 0; 962 } 963 #endif 964 return db->lastRowid; 965 } 966 967 /* 968 ** Set the value returned by the sqlite3_last_insert_rowid() API function. 969 */ 970 void sqlite3_set_last_insert_rowid(sqlite3 *db, sqlite3_int64 iRowid){ 971 #ifdef SQLITE_ENABLE_API_ARMOR 972 if( !sqlite3SafetyCheckOk(db) ){ 973 (void)SQLITE_MISUSE_BKPT; 974 return; 975 } 976 #endif 977 sqlite3_mutex_enter(db->mutex); 978 db->lastRowid = iRowid; 979 sqlite3_mutex_leave(db->mutex); 980 } 981 982 /* 983 ** Return the number of changes in the most recent call to sqlite3_exec(). 984 */ 985 int sqlite3_changes(sqlite3 *db){ 986 #ifdef SQLITE_ENABLE_API_ARMOR 987 if( !sqlite3SafetyCheckOk(db) ){ 988 (void)SQLITE_MISUSE_BKPT; 989 return 0; 990 } 991 #endif 992 return db->nChange; 993 } 994 995 /* 996 ** Return the number of changes since the database handle was opened. 997 */ 998 int sqlite3_total_changes(sqlite3 *db){ 999 #ifdef SQLITE_ENABLE_API_ARMOR 1000 if( !sqlite3SafetyCheckOk(db) ){ 1001 (void)SQLITE_MISUSE_BKPT; 1002 return 0; 1003 } 1004 #endif 1005 return db->nTotalChange; 1006 } 1007 1008 /* 1009 ** Close all open savepoints. This function only manipulates fields of the 1010 ** database handle object, it does not close any savepoints that may be open 1011 ** at the b-tree/pager level. 1012 */ 1013 void sqlite3CloseSavepoints(sqlite3 *db){ 1014 while( db->pSavepoint ){ 1015 Savepoint *pTmp = db->pSavepoint; 1016 db->pSavepoint = pTmp->pNext; 1017 sqlite3DbFree(db, pTmp); 1018 } 1019 db->nSavepoint = 0; 1020 db->nStatement = 0; 1021 db->isTransactionSavepoint = 0; 1022 } 1023 1024 /* 1025 ** Invoke the destructor function associated with FuncDef p, if any. Except, 1026 ** if this is not the last copy of the function, do not invoke it. Multiple 1027 ** copies of a single function are created when create_function() is called 1028 ** with SQLITE_ANY as the encoding. 1029 */ 1030 static void functionDestroy(sqlite3 *db, FuncDef *p){ 1031 FuncDestructor *pDestructor = p->u.pDestructor; 1032 if( pDestructor ){ 1033 pDestructor->nRef--; 1034 if( pDestructor->nRef==0 ){ 1035 pDestructor->xDestroy(pDestructor->pUserData); 1036 sqlite3DbFree(db, pDestructor); 1037 } 1038 } 1039 } 1040 1041 /* 1042 ** Disconnect all sqlite3_vtab objects that belong to database connection 1043 ** db. This is called when db is being closed. 1044 */ 1045 static void disconnectAllVtab(sqlite3 *db){ 1046 #ifndef SQLITE_OMIT_VIRTUALTABLE 1047 int i; 1048 HashElem *p; 1049 sqlite3BtreeEnterAll(db); 1050 for(i=0; i<db->nDb; i++){ 1051 Schema *pSchema = db->aDb[i].pSchema; 1052 if( pSchema ){ 1053 for(p=sqliteHashFirst(&pSchema->tblHash); p; p=sqliteHashNext(p)){ 1054 Table *pTab = (Table *)sqliteHashData(p); 1055 if( IsVirtual(pTab) ) sqlite3VtabDisconnect(db, pTab); 1056 } 1057 } 1058 } 1059 for(p=sqliteHashFirst(&db->aModule); p; p=sqliteHashNext(p)){ 1060 Module *pMod = (Module *)sqliteHashData(p); 1061 if( pMod->pEpoTab ){ 1062 sqlite3VtabDisconnect(db, pMod->pEpoTab); 1063 } 1064 } 1065 sqlite3VtabUnlockList(db); 1066 sqlite3BtreeLeaveAll(db); 1067 #else 1068 UNUSED_PARAMETER(db); 1069 #endif 1070 } 1071 1072 /* 1073 ** Return TRUE if database connection db has unfinalized prepared 1074 ** statements or unfinished sqlite3_backup objects. 1075 */ 1076 static int connectionIsBusy(sqlite3 *db){ 1077 int j; 1078 assert( sqlite3_mutex_held(db->mutex) ); 1079 if( db->pVdbe ) return 1; 1080 for(j=0; j<db->nDb; j++){ 1081 Btree *pBt = db->aDb[j].pBt; 1082 if( pBt && sqlite3BtreeIsInBackup(pBt) ) return 1; 1083 } 1084 return 0; 1085 } 1086 1087 /* 1088 ** Close an existing SQLite database 1089 */ 1090 static int sqlite3Close(sqlite3 *db, int forceZombie){ 1091 if( !db ){ 1092 /* EVIDENCE-OF: R-63257-11740 Calling sqlite3_close() or 1093 ** sqlite3_close_v2() with a NULL pointer argument is a harmless no-op. */ 1094 return SQLITE_OK; 1095 } 1096 if( !sqlite3SafetyCheckSickOrOk(db) ){ 1097 return SQLITE_MISUSE_BKPT; 1098 } 1099 sqlite3_mutex_enter(db->mutex); 1100 if( db->mTrace & SQLITE_TRACE_CLOSE ){ 1101 db->xTrace(SQLITE_TRACE_CLOSE, db->pTraceArg, db, 0); 1102 } 1103 1104 /* Force xDisconnect calls on all virtual tables */ 1105 disconnectAllVtab(db); 1106 1107 /* If a transaction is open, the disconnectAllVtab() call above 1108 ** will not have called the xDisconnect() method on any virtual 1109 ** tables in the db->aVTrans[] array. The following sqlite3VtabRollback() 1110 ** call will do so. We need to do this before the check for active 1111 ** SQL statements below, as the v-table implementation may be storing 1112 ** some prepared statements internally. 1113 */ 1114 sqlite3VtabRollback(db); 1115 1116 /* Legacy behavior (sqlite3_close() behavior) is to return 1117 ** SQLITE_BUSY if the connection can not be closed immediately. 1118 */ 1119 if( !forceZombie && connectionIsBusy(db) ){ 1120 sqlite3ErrorWithMsg(db, SQLITE_BUSY, "unable to close due to unfinalized " 1121 "statements or unfinished backups"); 1122 sqlite3_mutex_leave(db->mutex); 1123 return SQLITE_BUSY; 1124 } 1125 1126 #ifdef SQLITE_ENABLE_SQLLOG 1127 if( sqlite3GlobalConfig.xSqllog ){ 1128 /* Closing the handle. Fourth parameter is passed the value 2. */ 1129 sqlite3GlobalConfig.xSqllog(sqlite3GlobalConfig.pSqllogArg, db, 0, 2); 1130 } 1131 #endif 1132 1133 /* Convert the connection into a zombie and then close it. 1134 */ 1135 db->magic = SQLITE_MAGIC_ZOMBIE; 1136 sqlite3LeaveMutexAndCloseZombie(db); 1137 return SQLITE_OK; 1138 } 1139 1140 /* 1141 ** Two variations on the public interface for closing a database 1142 ** connection. The sqlite3_close() version returns SQLITE_BUSY and 1143 ** leaves the connection option if there are unfinalized prepared 1144 ** statements or unfinished sqlite3_backups. The sqlite3_close_v2() 1145 ** version forces the connection to become a zombie if there are 1146 ** unclosed resources, and arranges for deallocation when the last 1147 ** prepare statement or sqlite3_backup closes. 1148 */ 1149 int sqlite3_close(sqlite3 *db){ return sqlite3Close(db,0); } 1150 int sqlite3_close_v2(sqlite3 *db){ return sqlite3Close(db,1); } 1151 1152 1153 /* 1154 ** Close the mutex on database connection db. 1155 ** 1156 ** Furthermore, if database connection db is a zombie (meaning that there 1157 ** has been a prior call to sqlite3_close(db) or sqlite3_close_v2(db)) and 1158 ** every sqlite3_stmt has now been finalized and every sqlite3_backup has 1159 ** finished, then free all resources. 1160 */ 1161 void sqlite3LeaveMutexAndCloseZombie(sqlite3 *db){ 1162 HashElem *i; /* Hash table iterator */ 1163 int j; 1164 1165 /* If there are outstanding sqlite3_stmt or sqlite3_backup objects 1166 ** or if the connection has not yet been closed by sqlite3_close_v2(), 1167 ** then just leave the mutex and return. 1168 */ 1169 if( db->magic!=SQLITE_MAGIC_ZOMBIE || connectionIsBusy(db) ){ 1170 sqlite3_mutex_leave(db->mutex); 1171 return; 1172 } 1173 1174 /* If we reach this point, it means that the database connection has 1175 ** closed all sqlite3_stmt and sqlite3_backup objects and has been 1176 ** passed to sqlite3_close (meaning that it is a zombie). Therefore, 1177 ** go ahead and free all resources. 1178 */ 1179 1180 /* If a transaction is open, roll it back. This also ensures that if 1181 ** any database schemas have been modified by an uncommitted transaction 1182 ** they are reset. And that the required b-tree mutex is held to make 1183 ** the pager rollback and schema reset an atomic operation. */ 1184 sqlite3RollbackAll(db, SQLITE_OK); 1185 1186 /* Free any outstanding Savepoint structures. */ 1187 sqlite3CloseSavepoints(db); 1188 1189 /* Close all database connections */ 1190 for(j=0; j<db->nDb; j++){ 1191 struct Db *pDb = &db->aDb[j]; 1192 if( pDb->pBt ){ 1193 sqlite3BtreeClose(pDb->pBt); 1194 pDb->pBt = 0; 1195 if( j!=1 ){ 1196 pDb->pSchema = 0; 1197 } 1198 } 1199 } 1200 /* Clear the TEMP schema separately and last */ 1201 if( db->aDb[1].pSchema ){ 1202 sqlite3SchemaClear(db->aDb[1].pSchema); 1203 } 1204 sqlite3VtabUnlockList(db); 1205 1206 /* Free up the array of auxiliary databases */ 1207 sqlite3CollapseDatabaseArray(db); 1208 assert( db->nDb<=2 ); 1209 assert( db->aDb==db->aDbStatic ); 1210 1211 /* Tell the code in notify.c that the connection no longer holds any 1212 ** locks and does not require any further unlock-notify callbacks. 1213 */ 1214 sqlite3ConnectionClosed(db); 1215 1216 for(i=sqliteHashFirst(&db->aFunc); i; i=sqliteHashNext(i)){ 1217 FuncDef *pNext, *p; 1218 p = sqliteHashData(i); 1219 do{ 1220 functionDestroy(db, p); 1221 pNext = p->pNext; 1222 sqlite3DbFree(db, p); 1223 p = pNext; 1224 }while( p ); 1225 } 1226 sqlite3HashClear(&db->aFunc); 1227 for(i=sqliteHashFirst(&db->aCollSeq); i; i=sqliteHashNext(i)){ 1228 CollSeq *pColl = (CollSeq *)sqliteHashData(i); 1229 /* Invoke any destructors registered for collation sequence user data. */ 1230 for(j=0; j<3; j++){ 1231 if( pColl[j].xDel ){ 1232 pColl[j].xDel(pColl[j].pUser); 1233 } 1234 } 1235 sqlite3DbFree(db, pColl); 1236 } 1237 sqlite3HashClear(&db->aCollSeq); 1238 #ifndef SQLITE_OMIT_VIRTUALTABLE 1239 for(i=sqliteHashFirst(&db->aModule); i; i=sqliteHashNext(i)){ 1240 Module *pMod = (Module *)sqliteHashData(i); 1241 sqlite3VtabEponymousTableClear(db, pMod); 1242 sqlite3VtabModuleUnref(db, pMod); 1243 } 1244 sqlite3HashClear(&db->aModule); 1245 #endif 1246 1247 sqlite3Error(db, SQLITE_OK); /* Deallocates any cached error strings. */ 1248 sqlite3ValueFree(db->pErr); 1249 sqlite3CloseExtensions(db); 1250 #if SQLITE_USER_AUTHENTICATION 1251 sqlite3_free(db->auth.zAuthUser); 1252 sqlite3_free(db->auth.zAuthPW); 1253 #endif 1254 1255 db->magic = SQLITE_MAGIC_ERROR; 1256 1257 /* The temp-database schema is allocated differently from the other schema 1258 ** objects (using sqliteMalloc() directly, instead of sqlite3BtreeSchema()). 1259 ** So it needs to be freed here. Todo: Why not roll the temp schema into 1260 ** the same sqliteMalloc() as the one that allocates the database 1261 ** structure? 1262 */ 1263 sqlite3DbFree(db, db->aDb[1].pSchema); 1264 sqlite3_mutex_leave(db->mutex); 1265 db->magic = SQLITE_MAGIC_CLOSED; 1266 sqlite3_mutex_free(db->mutex); 1267 assert( sqlite3LookasideUsed(db,0)==0 ); 1268 if( db->lookaside.bMalloced ){ 1269 sqlite3_free(db->lookaside.pStart); 1270 } 1271 sqlite3_free(db); 1272 } 1273 1274 /* 1275 ** Rollback all database files. If tripCode is not SQLITE_OK, then 1276 ** any write cursors are invalidated ("tripped" - as in "tripping a circuit 1277 ** breaker") and made to return tripCode if there are any further 1278 ** attempts to use that cursor. Read cursors remain open and valid 1279 ** but are "saved" in case the table pages are moved around. 1280 */ 1281 void sqlite3RollbackAll(sqlite3 *db, int tripCode){ 1282 int i; 1283 int inTrans = 0; 1284 int schemaChange; 1285 assert( sqlite3_mutex_held(db->mutex) ); 1286 sqlite3BeginBenignMalloc(); 1287 1288 /* Obtain all b-tree mutexes before making any calls to BtreeRollback(). 1289 ** This is important in case the transaction being rolled back has 1290 ** modified the database schema. If the b-tree mutexes are not taken 1291 ** here, then another shared-cache connection might sneak in between 1292 ** the database rollback and schema reset, which can cause false 1293 ** corruption reports in some cases. */ 1294 sqlite3BtreeEnterAll(db); 1295 schemaChange = (db->mDbFlags & DBFLAG_SchemaChange)!=0 && db->init.busy==0; 1296 1297 for(i=0; i<db->nDb; i++){ 1298 Btree *p = db->aDb[i].pBt; 1299 if( p ){ 1300 if( sqlite3BtreeIsInTrans(p) ){ 1301 inTrans = 1; 1302 } 1303 sqlite3BtreeRollback(p, tripCode, !schemaChange); 1304 } 1305 } 1306 sqlite3VtabRollback(db); 1307 sqlite3EndBenignMalloc(); 1308 1309 if( schemaChange ){ 1310 sqlite3ExpirePreparedStatements(db, 0); 1311 sqlite3ResetAllSchemasOfConnection(db); 1312 } 1313 sqlite3BtreeLeaveAll(db); 1314 1315 /* Any deferred constraint violations have now been resolved. */ 1316 db->nDeferredCons = 0; 1317 db->nDeferredImmCons = 0; 1318 db->flags &= ~(u64)SQLITE_DeferFKs; 1319 1320 /* If one has been configured, invoke the rollback-hook callback */ 1321 if( db->xRollbackCallback && (inTrans || !db->autoCommit) ){ 1322 db->xRollbackCallback(db->pRollbackArg); 1323 } 1324 } 1325 1326 /* 1327 ** Return a static string containing the name corresponding to the error code 1328 ** specified in the argument. 1329 */ 1330 #if defined(SQLITE_NEED_ERR_NAME) 1331 const char *sqlite3ErrName(int rc){ 1332 const char *zName = 0; 1333 int i, origRc = rc; 1334 for(i=0; i<2 && zName==0; i++, rc &= 0xff){ 1335 switch( rc ){ 1336 case SQLITE_OK: zName = "SQLITE_OK"; break; 1337 case SQLITE_ERROR: zName = "SQLITE_ERROR"; break; 1338 case SQLITE_ERROR_SNAPSHOT: zName = "SQLITE_ERROR_SNAPSHOT"; break; 1339 case SQLITE_INTERNAL: zName = "SQLITE_INTERNAL"; break; 1340 case SQLITE_PERM: zName = "SQLITE_PERM"; break; 1341 case SQLITE_ABORT: zName = "SQLITE_ABORT"; break; 1342 case SQLITE_ABORT_ROLLBACK: zName = "SQLITE_ABORT_ROLLBACK"; break; 1343 case SQLITE_BUSY: zName = "SQLITE_BUSY"; break; 1344 case SQLITE_BUSY_RECOVERY: zName = "SQLITE_BUSY_RECOVERY"; break; 1345 case SQLITE_BUSY_SNAPSHOT: zName = "SQLITE_BUSY_SNAPSHOT"; break; 1346 case SQLITE_LOCKED: zName = "SQLITE_LOCKED"; break; 1347 case SQLITE_LOCKED_SHAREDCACHE: zName = "SQLITE_LOCKED_SHAREDCACHE";break; 1348 case SQLITE_NOMEM: zName = "SQLITE_NOMEM"; break; 1349 case SQLITE_READONLY: zName = "SQLITE_READONLY"; break; 1350 case SQLITE_READONLY_RECOVERY: zName = "SQLITE_READONLY_RECOVERY"; break; 1351 case SQLITE_READONLY_CANTINIT: zName = "SQLITE_READONLY_CANTINIT"; break; 1352 case SQLITE_READONLY_ROLLBACK: zName = "SQLITE_READONLY_ROLLBACK"; break; 1353 case SQLITE_READONLY_DBMOVED: zName = "SQLITE_READONLY_DBMOVED"; break; 1354 case SQLITE_READONLY_DIRECTORY: zName = "SQLITE_READONLY_DIRECTORY";break; 1355 case SQLITE_INTERRUPT: zName = "SQLITE_INTERRUPT"; break; 1356 case SQLITE_IOERR: zName = "SQLITE_IOERR"; break; 1357 case SQLITE_IOERR_READ: zName = "SQLITE_IOERR_READ"; break; 1358 case SQLITE_IOERR_SHORT_READ: zName = "SQLITE_IOERR_SHORT_READ"; break; 1359 case SQLITE_IOERR_WRITE: zName = "SQLITE_IOERR_WRITE"; break; 1360 case SQLITE_IOERR_FSYNC: zName = "SQLITE_IOERR_FSYNC"; break; 1361 case SQLITE_IOERR_DIR_FSYNC: zName = "SQLITE_IOERR_DIR_FSYNC"; break; 1362 case SQLITE_IOERR_TRUNCATE: zName = "SQLITE_IOERR_TRUNCATE"; break; 1363 case SQLITE_IOERR_FSTAT: zName = "SQLITE_IOERR_FSTAT"; break; 1364 case SQLITE_IOERR_UNLOCK: zName = "SQLITE_IOERR_UNLOCK"; break; 1365 case SQLITE_IOERR_RDLOCK: zName = "SQLITE_IOERR_RDLOCK"; break; 1366 case SQLITE_IOERR_DELETE: zName = "SQLITE_IOERR_DELETE"; break; 1367 case SQLITE_IOERR_NOMEM: zName = "SQLITE_IOERR_NOMEM"; break; 1368 case SQLITE_IOERR_ACCESS: zName = "SQLITE_IOERR_ACCESS"; break; 1369 case SQLITE_IOERR_CHECKRESERVEDLOCK: 1370 zName = "SQLITE_IOERR_CHECKRESERVEDLOCK"; break; 1371 case SQLITE_IOERR_LOCK: zName = "SQLITE_IOERR_LOCK"; break; 1372 case SQLITE_IOERR_CLOSE: zName = "SQLITE_IOERR_CLOSE"; break; 1373 case SQLITE_IOERR_DIR_CLOSE: zName = "SQLITE_IOERR_DIR_CLOSE"; break; 1374 case SQLITE_IOERR_SHMOPEN: zName = "SQLITE_IOERR_SHMOPEN"; break; 1375 case SQLITE_IOERR_SHMSIZE: zName = "SQLITE_IOERR_SHMSIZE"; break; 1376 case SQLITE_IOERR_SHMLOCK: zName = "SQLITE_IOERR_SHMLOCK"; break; 1377 case SQLITE_IOERR_SHMMAP: zName = "SQLITE_IOERR_SHMMAP"; break; 1378 case SQLITE_IOERR_SEEK: zName = "SQLITE_IOERR_SEEK"; break; 1379 case SQLITE_IOERR_DELETE_NOENT: zName = "SQLITE_IOERR_DELETE_NOENT";break; 1380 case SQLITE_IOERR_MMAP: zName = "SQLITE_IOERR_MMAP"; break; 1381 case SQLITE_IOERR_GETTEMPPATH: zName = "SQLITE_IOERR_GETTEMPPATH"; break; 1382 case SQLITE_IOERR_CONVPATH: zName = "SQLITE_IOERR_CONVPATH"; break; 1383 case SQLITE_CORRUPT: zName = "SQLITE_CORRUPT"; break; 1384 case SQLITE_CORRUPT_VTAB: zName = "SQLITE_CORRUPT_VTAB"; break; 1385 case SQLITE_NOTFOUND: zName = "SQLITE_NOTFOUND"; break; 1386 case SQLITE_FULL: zName = "SQLITE_FULL"; break; 1387 case SQLITE_CANTOPEN: zName = "SQLITE_CANTOPEN"; break; 1388 case SQLITE_CANTOPEN_NOTEMPDIR: zName = "SQLITE_CANTOPEN_NOTEMPDIR";break; 1389 case SQLITE_CANTOPEN_ISDIR: zName = "SQLITE_CANTOPEN_ISDIR"; break; 1390 case SQLITE_CANTOPEN_FULLPATH: zName = "SQLITE_CANTOPEN_FULLPATH"; break; 1391 case SQLITE_CANTOPEN_CONVPATH: zName = "SQLITE_CANTOPEN_CONVPATH"; break; 1392 case SQLITE_PROTOCOL: zName = "SQLITE_PROTOCOL"; break; 1393 case SQLITE_EMPTY: zName = "SQLITE_EMPTY"; break; 1394 case SQLITE_SCHEMA: zName = "SQLITE_SCHEMA"; break; 1395 case SQLITE_TOOBIG: zName = "SQLITE_TOOBIG"; break; 1396 case SQLITE_CONSTRAINT: zName = "SQLITE_CONSTRAINT"; break; 1397 case SQLITE_CONSTRAINT_UNIQUE: zName = "SQLITE_CONSTRAINT_UNIQUE"; break; 1398 case SQLITE_CONSTRAINT_TRIGGER: zName = "SQLITE_CONSTRAINT_TRIGGER";break; 1399 case SQLITE_CONSTRAINT_FOREIGNKEY: 1400 zName = "SQLITE_CONSTRAINT_FOREIGNKEY"; break; 1401 case SQLITE_CONSTRAINT_CHECK: zName = "SQLITE_CONSTRAINT_CHECK"; break; 1402 case SQLITE_CONSTRAINT_PRIMARYKEY: 1403 zName = "SQLITE_CONSTRAINT_PRIMARYKEY"; break; 1404 case SQLITE_CONSTRAINT_NOTNULL: zName = "SQLITE_CONSTRAINT_NOTNULL";break; 1405 case SQLITE_CONSTRAINT_COMMITHOOK: 1406 zName = "SQLITE_CONSTRAINT_COMMITHOOK"; break; 1407 case SQLITE_CONSTRAINT_VTAB: zName = "SQLITE_CONSTRAINT_VTAB"; break; 1408 case SQLITE_CONSTRAINT_FUNCTION: 1409 zName = "SQLITE_CONSTRAINT_FUNCTION"; break; 1410 case SQLITE_CONSTRAINT_ROWID: zName = "SQLITE_CONSTRAINT_ROWID"; break; 1411 case SQLITE_MISMATCH: zName = "SQLITE_MISMATCH"; break; 1412 case SQLITE_MISUSE: zName = "SQLITE_MISUSE"; break; 1413 case SQLITE_NOLFS: zName = "SQLITE_NOLFS"; break; 1414 case SQLITE_AUTH: zName = "SQLITE_AUTH"; break; 1415 case SQLITE_FORMAT: zName = "SQLITE_FORMAT"; break; 1416 case SQLITE_RANGE: zName = "SQLITE_RANGE"; break; 1417 case SQLITE_NOTADB: zName = "SQLITE_NOTADB"; break; 1418 case SQLITE_ROW: zName = "SQLITE_ROW"; break; 1419 case SQLITE_NOTICE: zName = "SQLITE_NOTICE"; break; 1420 case SQLITE_NOTICE_RECOVER_WAL: zName = "SQLITE_NOTICE_RECOVER_WAL";break; 1421 case SQLITE_NOTICE_RECOVER_ROLLBACK: 1422 zName = "SQLITE_NOTICE_RECOVER_ROLLBACK"; break; 1423 case SQLITE_WARNING: zName = "SQLITE_WARNING"; break; 1424 case SQLITE_WARNING_AUTOINDEX: zName = "SQLITE_WARNING_AUTOINDEX"; break; 1425 case SQLITE_DONE: zName = "SQLITE_DONE"; break; 1426 } 1427 } 1428 if( zName==0 ){ 1429 static char zBuf[50]; 1430 sqlite3_snprintf(sizeof(zBuf), zBuf, "SQLITE_UNKNOWN(%d)", origRc); 1431 zName = zBuf; 1432 } 1433 return zName; 1434 } 1435 #endif 1436 1437 /* 1438 ** Return a static string that describes the kind of error specified in the 1439 ** argument. 1440 */ 1441 const char *sqlite3ErrStr(int rc){ 1442 static const char* const aMsg[] = { 1443 /* SQLITE_OK */ "not an error", 1444 /* SQLITE_ERROR */ "SQL logic error", 1445 /* SQLITE_INTERNAL */ 0, 1446 /* SQLITE_PERM */ "access permission denied", 1447 /* SQLITE_ABORT */ "query aborted", 1448 /* SQLITE_BUSY */ "database is locked", 1449 /* SQLITE_LOCKED */ "database table is locked", 1450 /* SQLITE_NOMEM */ "out of memory", 1451 /* SQLITE_READONLY */ "attempt to write a readonly database", 1452 /* SQLITE_INTERRUPT */ "interrupted", 1453 /* SQLITE_IOERR */ "disk I/O error", 1454 /* SQLITE_CORRUPT */ "database disk image is malformed", 1455 /* SQLITE_NOTFOUND */ "unknown operation", 1456 /* SQLITE_FULL */ "database or disk is full", 1457 /* SQLITE_CANTOPEN */ "unable to open database file", 1458 /* SQLITE_PROTOCOL */ "locking protocol", 1459 /* SQLITE_EMPTY */ 0, 1460 /* SQLITE_SCHEMA */ "database schema has changed", 1461 /* SQLITE_TOOBIG */ "string or blob too big", 1462 /* SQLITE_CONSTRAINT */ "constraint failed", 1463 /* SQLITE_MISMATCH */ "datatype mismatch", 1464 /* SQLITE_MISUSE */ "bad parameter or other API misuse", 1465 #ifdef SQLITE_DISABLE_LFS 1466 /* SQLITE_NOLFS */ "large file support is disabled", 1467 #else 1468 /* SQLITE_NOLFS */ 0, 1469 #endif 1470 /* SQLITE_AUTH */ "authorization denied", 1471 /* SQLITE_FORMAT */ 0, 1472 /* SQLITE_RANGE */ "column index out of range", 1473 /* SQLITE_NOTADB */ "file is not a database", 1474 /* SQLITE_NOTICE */ "notification message", 1475 /* SQLITE_WARNING */ "warning message", 1476 }; 1477 const char *zErr = "unknown error"; 1478 switch( rc ){ 1479 case SQLITE_ABORT_ROLLBACK: { 1480 zErr = "abort due to ROLLBACK"; 1481 break; 1482 } 1483 case SQLITE_ROW: { 1484 zErr = "another row available"; 1485 break; 1486 } 1487 case SQLITE_DONE: { 1488 zErr = "no more rows available"; 1489 break; 1490 } 1491 default: { 1492 rc &= 0xff; 1493 if( ALWAYS(rc>=0) && rc<ArraySize(aMsg) && aMsg[rc]!=0 ){ 1494 zErr = aMsg[rc]; 1495 } 1496 break; 1497 } 1498 } 1499 return zErr; 1500 } 1501 1502 /* 1503 ** This routine implements a busy callback that sleeps and tries 1504 ** again until a timeout value is reached. The timeout value is 1505 ** an integer number of milliseconds passed in as the first 1506 ** argument. 1507 ** 1508 ** Return non-zero to retry the lock. Return zero to stop trying 1509 ** and cause SQLite to return SQLITE_BUSY. 1510 */ 1511 static int sqliteDefaultBusyCallback( 1512 void *ptr, /* Database connection */ 1513 int count, /* Number of times table has been busy */ 1514 sqlite3_file *pFile /* The file on which the lock occurred */ 1515 ){ 1516 #if SQLITE_OS_WIN || HAVE_USLEEP 1517 /* This case is for systems that have support for sleeping for fractions of 1518 ** a second. Examples: All windows systems, unix systems with usleep() */ 1519 static const u8 delays[] = 1520 { 1, 2, 5, 10, 15, 20, 25, 25, 25, 50, 50, 100 }; 1521 static const u8 totals[] = 1522 { 0, 1, 3, 8, 18, 33, 53, 78, 103, 128, 178, 228 }; 1523 # define NDELAY ArraySize(delays) 1524 sqlite3 *db = (sqlite3 *)ptr; 1525 int tmout = db->busyTimeout; 1526 int delay, prior; 1527 1528 #ifdef SQLITE_ENABLE_SETLK_TIMEOUT 1529 if( sqlite3OsFileControl(pFile,SQLITE_FCNTL_LOCK_TIMEOUT,&tmout)==SQLITE_OK ){ 1530 if( count ){ 1531 tmout = 0; 1532 sqlite3OsFileControl(pFile, SQLITE_FCNTL_LOCK_TIMEOUT, &tmout); 1533 return 0; 1534 }else{ 1535 return 1; 1536 } 1537 } 1538 #else 1539 UNUSED_PARAMETER(pFile); 1540 #endif 1541 assert( count>=0 ); 1542 if( count < NDELAY ){ 1543 delay = delays[count]; 1544 prior = totals[count]; 1545 }else{ 1546 delay = delays[NDELAY-1]; 1547 prior = totals[NDELAY-1] + delay*(count-(NDELAY-1)); 1548 } 1549 if( prior + delay > tmout ){ 1550 delay = tmout - prior; 1551 if( delay<=0 ) return 0; 1552 } 1553 sqlite3OsSleep(db->pVfs, delay*1000); 1554 return 1; 1555 #else 1556 /* This case for unix systems that lack usleep() support. Sleeping 1557 ** must be done in increments of whole seconds */ 1558 sqlite3 *db = (sqlite3 *)ptr; 1559 int tmout = ((sqlite3 *)ptr)->busyTimeout; 1560 UNUSED_PARAMETER(pFile); 1561 if( (count+1)*1000 > tmout ){ 1562 return 0; 1563 } 1564 sqlite3OsSleep(db->pVfs, 1000000); 1565 return 1; 1566 #endif 1567 } 1568 1569 /* 1570 ** Invoke the given busy handler. 1571 ** 1572 ** This routine is called when an operation failed to acquire a 1573 ** lock on VFS file pFile. 1574 ** 1575 ** If this routine returns non-zero, the lock is retried. If it 1576 ** returns 0, the operation aborts with an SQLITE_BUSY error. 1577 */ 1578 int sqlite3InvokeBusyHandler(BusyHandler *p, sqlite3_file *pFile){ 1579 int rc; 1580 if( p->xBusyHandler==0 || p->nBusy<0 ) return 0; 1581 if( p->bExtraFileArg ){ 1582 /* Add an extra parameter with the pFile pointer to the end of the 1583 ** callback argument list */ 1584 int (*xTra)(void*,int,sqlite3_file*); 1585 xTra = (int(*)(void*,int,sqlite3_file*))p->xBusyHandler; 1586 rc = xTra(p->pBusyArg, p->nBusy, pFile); 1587 }else{ 1588 /* Legacy style busy handler callback */ 1589 rc = p->xBusyHandler(p->pBusyArg, p->nBusy); 1590 } 1591 if( rc==0 ){ 1592 p->nBusy = -1; 1593 }else{ 1594 p->nBusy++; 1595 } 1596 return rc; 1597 } 1598 1599 /* 1600 ** This routine sets the busy callback for an Sqlite database to the 1601 ** given callback function with the given argument. 1602 */ 1603 int sqlite3_busy_handler( 1604 sqlite3 *db, 1605 int (*xBusy)(void*,int), 1606 void *pArg 1607 ){ 1608 #ifdef SQLITE_ENABLE_API_ARMOR 1609 if( !sqlite3SafetyCheckOk(db) ) return SQLITE_MISUSE_BKPT; 1610 #endif 1611 sqlite3_mutex_enter(db->mutex); 1612 db->busyHandler.xBusyHandler = xBusy; 1613 db->busyHandler.pBusyArg = pArg; 1614 db->busyHandler.nBusy = 0; 1615 db->busyHandler.bExtraFileArg = 0; 1616 db->busyTimeout = 0; 1617 sqlite3_mutex_leave(db->mutex); 1618 return SQLITE_OK; 1619 } 1620 1621 #ifndef SQLITE_OMIT_PROGRESS_CALLBACK 1622 /* 1623 ** This routine sets the progress callback for an Sqlite database to the 1624 ** given callback function with the given argument. The progress callback will 1625 ** be invoked every nOps opcodes. 1626 */ 1627 void sqlite3_progress_handler( 1628 sqlite3 *db, 1629 int nOps, 1630 int (*xProgress)(void*), 1631 void *pArg 1632 ){ 1633 #ifdef SQLITE_ENABLE_API_ARMOR 1634 if( !sqlite3SafetyCheckOk(db) ){ 1635 (void)SQLITE_MISUSE_BKPT; 1636 return; 1637 } 1638 #endif 1639 sqlite3_mutex_enter(db->mutex); 1640 if( nOps>0 ){ 1641 db->xProgress = xProgress; 1642 db->nProgressOps = (unsigned)nOps; 1643 db->pProgressArg = pArg; 1644 }else{ 1645 db->xProgress = 0; 1646 db->nProgressOps = 0; 1647 db->pProgressArg = 0; 1648 } 1649 sqlite3_mutex_leave(db->mutex); 1650 } 1651 #endif 1652 1653 1654 /* 1655 ** This routine installs a default busy handler that waits for the 1656 ** specified number of milliseconds before returning 0. 1657 */ 1658 int sqlite3_busy_timeout(sqlite3 *db, int ms){ 1659 #ifdef SQLITE_ENABLE_API_ARMOR 1660 if( !sqlite3SafetyCheckOk(db) ) return SQLITE_MISUSE_BKPT; 1661 #endif 1662 if( ms>0 ){ 1663 sqlite3_busy_handler(db, (int(*)(void*,int))sqliteDefaultBusyCallback, 1664 (void*)db); 1665 db->busyTimeout = ms; 1666 db->busyHandler.bExtraFileArg = 1; 1667 }else{ 1668 sqlite3_busy_handler(db, 0, 0); 1669 } 1670 return SQLITE_OK; 1671 } 1672 1673 /* 1674 ** Cause any pending operation to stop at its earliest opportunity. 1675 */ 1676 void sqlite3_interrupt(sqlite3 *db){ 1677 #ifdef SQLITE_ENABLE_API_ARMOR 1678 if( !sqlite3SafetyCheckOk(db) && (db==0 || db->magic!=SQLITE_MAGIC_ZOMBIE) ){ 1679 (void)SQLITE_MISUSE_BKPT; 1680 return; 1681 } 1682 #endif 1683 db->u1.isInterrupted = 1; 1684 } 1685 1686 1687 /* 1688 ** This function is exactly the same as sqlite3_create_function(), except 1689 ** that it is designed to be called by internal code. The difference is 1690 ** that if a malloc() fails in sqlite3_create_function(), an error code 1691 ** is returned and the mallocFailed flag cleared. 1692 */ 1693 int sqlite3CreateFunc( 1694 sqlite3 *db, 1695 const char *zFunctionName, 1696 int nArg, 1697 int enc, 1698 void *pUserData, 1699 void (*xSFunc)(sqlite3_context*,int,sqlite3_value **), 1700 void (*xStep)(sqlite3_context*,int,sqlite3_value **), 1701 void (*xFinal)(sqlite3_context*), 1702 void (*xValue)(sqlite3_context*), 1703 void (*xInverse)(sqlite3_context*,int,sqlite3_value **), 1704 FuncDestructor *pDestructor 1705 ){ 1706 FuncDef *p; 1707 int nName; 1708 int extraFlags; 1709 1710 assert( sqlite3_mutex_held(db->mutex) ); 1711 assert( xValue==0 || xSFunc==0 ); 1712 if( zFunctionName==0 /* Must have a valid name */ 1713 || (xSFunc!=0 && xFinal!=0) /* Not both xSFunc and xFinal */ 1714 || ((xFinal==0)!=(xStep==0)) /* Both or neither of xFinal and xStep */ 1715 || ((xValue==0)!=(xInverse==0)) /* Both or neither of xValue, xInverse */ 1716 || (nArg<-1 || nArg>SQLITE_MAX_FUNCTION_ARG) 1717 || (255<(nName = sqlite3Strlen30( zFunctionName))) 1718 ){ 1719 return SQLITE_MISUSE_BKPT; 1720 } 1721 1722 assert( SQLITE_FUNC_CONSTANT==SQLITE_DETERMINISTIC ); 1723 assert( SQLITE_FUNC_DIRECT==SQLITE_DIRECTONLY ); 1724 extraFlags = enc & (SQLITE_DETERMINISTIC|SQLITE_DIRECTONLY|SQLITE_SUBTYPE); 1725 enc &= (SQLITE_FUNC_ENCMASK|SQLITE_ANY); 1726 1727 #ifndef SQLITE_OMIT_UTF16 1728 /* If SQLITE_UTF16 is specified as the encoding type, transform this 1729 ** to one of SQLITE_UTF16LE or SQLITE_UTF16BE using the 1730 ** SQLITE_UTF16NATIVE macro. SQLITE_UTF16 is not used internally. 1731 ** 1732 ** If SQLITE_ANY is specified, add three versions of the function 1733 ** to the hash table. 1734 */ 1735 if( enc==SQLITE_UTF16 ){ 1736 enc = SQLITE_UTF16NATIVE; 1737 }else if( enc==SQLITE_ANY ){ 1738 int rc; 1739 rc = sqlite3CreateFunc(db, zFunctionName, nArg, SQLITE_UTF8|extraFlags, 1740 pUserData, xSFunc, xStep, xFinal, xValue, xInverse, pDestructor); 1741 if( rc==SQLITE_OK ){ 1742 rc = sqlite3CreateFunc(db, zFunctionName, nArg, SQLITE_UTF16LE|extraFlags, 1743 pUserData, xSFunc, xStep, xFinal, xValue, xInverse, pDestructor); 1744 } 1745 if( rc!=SQLITE_OK ){ 1746 return rc; 1747 } 1748 enc = SQLITE_UTF16BE; 1749 } 1750 #else 1751 enc = SQLITE_UTF8; 1752 #endif 1753 1754 /* Check if an existing function is being overridden or deleted. If so, 1755 ** and there are active VMs, then return SQLITE_BUSY. If a function 1756 ** is being overridden/deleted but there are no active VMs, allow the 1757 ** operation to continue but invalidate all precompiled statements. 1758 */ 1759 p = sqlite3FindFunction(db, zFunctionName, nArg, (u8)enc, 0); 1760 if( p && (p->funcFlags & SQLITE_FUNC_ENCMASK)==(u32)enc && p->nArg==nArg ){ 1761 if( db->nVdbeActive ){ 1762 sqlite3ErrorWithMsg(db, SQLITE_BUSY, 1763 "unable to delete/modify user-function due to active statements"); 1764 assert( !db->mallocFailed ); 1765 return SQLITE_BUSY; 1766 }else{ 1767 sqlite3ExpirePreparedStatements(db, 0); 1768 } 1769 } 1770 1771 p = sqlite3FindFunction(db, zFunctionName, nArg, (u8)enc, 1); 1772 assert(p || db->mallocFailed); 1773 if( !p ){ 1774 return SQLITE_NOMEM_BKPT; 1775 } 1776 1777 /* If an older version of the function with a configured destructor is 1778 ** being replaced invoke the destructor function here. */ 1779 functionDestroy(db, p); 1780 1781 if( pDestructor ){ 1782 pDestructor->nRef++; 1783 } 1784 p->u.pDestructor = pDestructor; 1785 p->funcFlags = (p->funcFlags & SQLITE_FUNC_ENCMASK) | extraFlags; 1786 testcase( p->funcFlags & SQLITE_DETERMINISTIC ); 1787 testcase( p->funcFlags & SQLITE_DIRECTONLY ); 1788 p->xSFunc = xSFunc ? xSFunc : xStep; 1789 p->xFinalize = xFinal; 1790 p->xValue = xValue; 1791 p->xInverse = xInverse; 1792 p->pUserData = pUserData; 1793 p->nArg = (u16)nArg; 1794 return SQLITE_OK; 1795 } 1796 1797 /* 1798 ** Worker function used by utf-8 APIs that create new functions: 1799 ** 1800 ** sqlite3_create_function() 1801 ** sqlite3_create_function_v2() 1802 ** sqlite3_create_window_function() 1803 */ 1804 static int createFunctionApi( 1805 sqlite3 *db, 1806 const char *zFunc, 1807 int nArg, 1808 int enc, 1809 void *p, 1810 void (*xSFunc)(sqlite3_context*,int,sqlite3_value**), 1811 void (*xStep)(sqlite3_context*,int,sqlite3_value**), 1812 void (*xFinal)(sqlite3_context*), 1813 void (*xValue)(sqlite3_context*), 1814 void (*xInverse)(sqlite3_context*,int,sqlite3_value**), 1815 void(*xDestroy)(void*) 1816 ){ 1817 int rc = SQLITE_ERROR; 1818 FuncDestructor *pArg = 0; 1819 1820 #ifdef SQLITE_ENABLE_API_ARMOR 1821 if( !sqlite3SafetyCheckOk(db) ){ 1822 return SQLITE_MISUSE_BKPT; 1823 } 1824 #endif 1825 sqlite3_mutex_enter(db->mutex); 1826 if( xDestroy ){ 1827 pArg = (FuncDestructor *)sqlite3Malloc(sizeof(FuncDestructor)); 1828 if( !pArg ){ 1829 sqlite3OomFault(db); 1830 xDestroy(p); 1831 goto out; 1832 } 1833 pArg->nRef = 0; 1834 pArg->xDestroy = xDestroy; 1835 pArg->pUserData = p; 1836 } 1837 rc = sqlite3CreateFunc(db, zFunc, nArg, enc, p, 1838 xSFunc, xStep, xFinal, xValue, xInverse, pArg 1839 ); 1840 if( pArg && pArg->nRef==0 ){ 1841 assert( rc!=SQLITE_OK ); 1842 xDestroy(p); 1843 sqlite3_free(pArg); 1844 } 1845 1846 out: 1847 rc = sqlite3ApiExit(db, rc); 1848 sqlite3_mutex_leave(db->mutex); 1849 return rc; 1850 } 1851 1852 /* 1853 ** Create new user functions. 1854 */ 1855 int sqlite3_create_function( 1856 sqlite3 *db, 1857 const char *zFunc, 1858 int nArg, 1859 int enc, 1860 void *p, 1861 void (*xSFunc)(sqlite3_context*,int,sqlite3_value **), 1862 void (*xStep)(sqlite3_context*,int,sqlite3_value **), 1863 void (*xFinal)(sqlite3_context*) 1864 ){ 1865 return createFunctionApi(db, zFunc, nArg, enc, p, xSFunc, xStep, 1866 xFinal, 0, 0, 0); 1867 } 1868 int sqlite3_create_function_v2( 1869 sqlite3 *db, 1870 const char *zFunc, 1871 int nArg, 1872 int enc, 1873 void *p, 1874 void (*xSFunc)(sqlite3_context*,int,sqlite3_value **), 1875 void (*xStep)(sqlite3_context*,int,sqlite3_value **), 1876 void (*xFinal)(sqlite3_context*), 1877 void (*xDestroy)(void *) 1878 ){ 1879 return createFunctionApi(db, zFunc, nArg, enc, p, xSFunc, xStep, 1880 xFinal, 0, 0, xDestroy); 1881 } 1882 int sqlite3_create_window_function( 1883 sqlite3 *db, 1884 const char *zFunc, 1885 int nArg, 1886 int enc, 1887 void *p, 1888 void (*xStep)(sqlite3_context*,int,sqlite3_value **), 1889 void (*xFinal)(sqlite3_context*), 1890 void (*xValue)(sqlite3_context*), 1891 void (*xInverse)(sqlite3_context*,int,sqlite3_value **), 1892 void (*xDestroy)(void *) 1893 ){ 1894 return createFunctionApi(db, zFunc, nArg, enc, p, 0, xStep, 1895 xFinal, xValue, xInverse, xDestroy); 1896 } 1897 1898 #ifndef SQLITE_OMIT_UTF16 1899 int sqlite3_create_function16( 1900 sqlite3 *db, 1901 const void *zFunctionName, 1902 int nArg, 1903 int eTextRep, 1904 void *p, 1905 void (*xSFunc)(sqlite3_context*,int,sqlite3_value**), 1906 void (*xStep)(sqlite3_context*,int,sqlite3_value**), 1907 void (*xFinal)(sqlite3_context*) 1908 ){ 1909 int rc; 1910 char *zFunc8; 1911 1912 #ifdef SQLITE_ENABLE_API_ARMOR 1913 if( !sqlite3SafetyCheckOk(db) || zFunctionName==0 ) return SQLITE_MISUSE_BKPT; 1914 #endif 1915 sqlite3_mutex_enter(db->mutex); 1916 assert( !db->mallocFailed ); 1917 zFunc8 = sqlite3Utf16to8(db, zFunctionName, -1, SQLITE_UTF16NATIVE); 1918 rc = sqlite3CreateFunc(db, zFunc8, nArg, eTextRep, p, xSFunc,xStep,xFinal,0,0,0); 1919 sqlite3DbFree(db, zFunc8); 1920 rc = sqlite3ApiExit(db, rc); 1921 sqlite3_mutex_leave(db->mutex); 1922 return rc; 1923 } 1924 #endif 1925 1926 1927 /* 1928 ** The following is the implementation of an SQL function that always 1929 ** fails with an error message stating that the function is used in the 1930 ** wrong context. The sqlite3_overload_function() API might construct 1931 ** SQL function that use this routine so that the functions will exist 1932 ** for name resolution but are actually overloaded by the xFindFunction 1933 ** method of virtual tables. 1934 */ 1935 static void sqlite3InvalidFunction( 1936 sqlite3_context *context, /* The function calling context */ 1937 int NotUsed, /* Number of arguments to the function */ 1938 sqlite3_value **NotUsed2 /* Value of each argument */ 1939 ){ 1940 const char *zName = (const char*)sqlite3_user_data(context); 1941 char *zErr; 1942 UNUSED_PARAMETER2(NotUsed, NotUsed2); 1943 zErr = sqlite3_mprintf( 1944 "unable to use function %s in the requested context", zName); 1945 sqlite3_result_error(context, zErr, -1); 1946 sqlite3_free(zErr); 1947 } 1948 1949 /* 1950 ** Declare that a function has been overloaded by a virtual table. 1951 ** 1952 ** If the function already exists as a regular global function, then 1953 ** this routine is a no-op. If the function does not exist, then create 1954 ** a new one that always throws a run-time error. 1955 ** 1956 ** When virtual tables intend to provide an overloaded function, they 1957 ** should call this routine to make sure the global function exists. 1958 ** A global function must exist in order for name resolution to work 1959 ** properly. 1960 */ 1961 int sqlite3_overload_function( 1962 sqlite3 *db, 1963 const char *zName, 1964 int nArg 1965 ){ 1966 int rc; 1967 char *zCopy; 1968 1969 #ifdef SQLITE_ENABLE_API_ARMOR 1970 if( !sqlite3SafetyCheckOk(db) || zName==0 || nArg<-2 ){ 1971 return SQLITE_MISUSE_BKPT; 1972 } 1973 #endif 1974 sqlite3_mutex_enter(db->mutex); 1975 rc = sqlite3FindFunction(db, zName, nArg, SQLITE_UTF8, 0)!=0; 1976 sqlite3_mutex_leave(db->mutex); 1977 if( rc ) return SQLITE_OK; 1978 zCopy = sqlite3_mprintf(zName); 1979 if( zCopy==0 ) return SQLITE_NOMEM; 1980 return sqlite3_create_function_v2(db, zName, nArg, SQLITE_UTF8, 1981 zCopy, sqlite3InvalidFunction, 0, 0, sqlite3_free); 1982 } 1983 1984 #ifndef SQLITE_OMIT_TRACE 1985 /* 1986 ** Register a trace function. The pArg from the previously registered trace 1987 ** is returned. 1988 ** 1989 ** A NULL trace function means that no tracing is executes. A non-NULL 1990 ** trace is a pointer to a function that is invoked at the start of each 1991 ** SQL statement. 1992 */ 1993 #ifndef SQLITE_OMIT_DEPRECATED 1994 void *sqlite3_trace(sqlite3 *db, void(*xTrace)(void*,const char*), void *pArg){ 1995 void *pOld; 1996 1997 #ifdef SQLITE_ENABLE_API_ARMOR 1998 if( !sqlite3SafetyCheckOk(db) ){ 1999 (void)SQLITE_MISUSE_BKPT; 2000 return 0; 2001 } 2002 #endif 2003 sqlite3_mutex_enter(db->mutex); 2004 pOld = db->pTraceArg; 2005 db->mTrace = xTrace ? SQLITE_TRACE_LEGACY : 0; 2006 db->xTrace = (int(*)(u32,void*,void*,void*))xTrace; 2007 db->pTraceArg = pArg; 2008 sqlite3_mutex_leave(db->mutex); 2009 return pOld; 2010 } 2011 #endif /* SQLITE_OMIT_DEPRECATED */ 2012 2013 /* Register a trace callback using the version-2 interface. 2014 */ 2015 int sqlite3_trace_v2( 2016 sqlite3 *db, /* Trace this connection */ 2017 unsigned mTrace, /* Mask of events to be traced */ 2018 int(*xTrace)(unsigned,void*,void*,void*), /* Callback to invoke */ 2019 void *pArg /* Context */ 2020 ){ 2021 #ifdef SQLITE_ENABLE_API_ARMOR 2022 if( !sqlite3SafetyCheckOk(db) ){ 2023 return SQLITE_MISUSE_BKPT; 2024 } 2025 #endif 2026 sqlite3_mutex_enter(db->mutex); 2027 if( mTrace==0 ) xTrace = 0; 2028 if( xTrace==0 ) mTrace = 0; 2029 db->mTrace = mTrace; 2030 db->xTrace = xTrace; 2031 db->pTraceArg = pArg; 2032 sqlite3_mutex_leave(db->mutex); 2033 return SQLITE_OK; 2034 } 2035 2036 #ifndef SQLITE_OMIT_DEPRECATED 2037 /* 2038 ** Register a profile function. The pArg from the previously registered 2039 ** profile function is returned. 2040 ** 2041 ** A NULL profile function means that no profiling is executes. A non-NULL 2042 ** profile is a pointer to a function that is invoked at the conclusion of 2043 ** each SQL statement that is run. 2044 */ 2045 void *sqlite3_profile( 2046 sqlite3 *db, 2047 void (*xProfile)(void*,const char*,sqlite_uint64), 2048 void *pArg 2049 ){ 2050 void *pOld; 2051 2052 #ifdef SQLITE_ENABLE_API_ARMOR 2053 if( !sqlite3SafetyCheckOk(db) ){ 2054 (void)SQLITE_MISUSE_BKPT; 2055 return 0; 2056 } 2057 #endif 2058 sqlite3_mutex_enter(db->mutex); 2059 pOld = db->pProfileArg; 2060 db->xProfile = xProfile; 2061 db->pProfileArg = pArg; 2062 db->mTrace &= SQLITE_TRACE_NONLEGACY_MASK; 2063 if( db->xProfile ) db->mTrace |= SQLITE_TRACE_XPROFILE; 2064 sqlite3_mutex_leave(db->mutex); 2065 return pOld; 2066 } 2067 #endif /* SQLITE_OMIT_DEPRECATED */ 2068 #endif /* SQLITE_OMIT_TRACE */ 2069 2070 /* 2071 ** Register a function to be invoked when a transaction commits. 2072 ** If the invoked function returns non-zero, then the commit becomes a 2073 ** rollback. 2074 */ 2075 void *sqlite3_commit_hook( 2076 sqlite3 *db, /* Attach the hook to this database */ 2077 int (*xCallback)(void*), /* Function to invoke on each commit */ 2078 void *pArg /* Argument to the function */ 2079 ){ 2080 void *pOld; 2081 2082 #ifdef SQLITE_ENABLE_API_ARMOR 2083 if( !sqlite3SafetyCheckOk(db) ){ 2084 (void)SQLITE_MISUSE_BKPT; 2085 return 0; 2086 } 2087 #endif 2088 sqlite3_mutex_enter(db->mutex); 2089 pOld = db->pCommitArg; 2090 db->xCommitCallback = xCallback; 2091 db->pCommitArg = pArg; 2092 sqlite3_mutex_leave(db->mutex); 2093 return pOld; 2094 } 2095 2096 /* 2097 ** Register a callback to be invoked each time a row is updated, 2098 ** inserted or deleted using this database connection. 2099 */ 2100 void *sqlite3_update_hook( 2101 sqlite3 *db, /* Attach the hook to this database */ 2102 void (*xCallback)(void*,int,char const *,char const *,sqlite_int64), 2103 void *pArg /* Argument to the function */ 2104 ){ 2105 void *pRet; 2106 2107 #ifdef SQLITE_ENABLE_API_ARMOR 2108 if( !sqlite3SafetyCheckOk(db) ){ 2109 (void)SQLITE_MISUSE_BKPT; 2110 return 0; 2111 } 2112 #endif 2113 sqlite3_mutex_enter(db->mutex); 2114 pRet = db->pUpdateArg; 2115 db->xUpdateCallback = xCallback; 2116 db->pUpdateArg = pArg; 2117 sqlite3_mutex_leave(db->mutex); 2118 return pRet; 2119 } 2120 2121 /* 2122 ** Register a callback to be invoked each time a transaction is rolled 2123 ** back by this database connection. 2124 */ 2125 void *sqlite3_rollback_hook( 2126 sqlite3 *db, /* Attach the hook to this database */ 2127 void (*xCallback)(void*), /* Callback function */ 2128 void *pArg /* Argument to the function */ 2129 ){ 2130 void *pRet; 2131 2132 #ifdef SQLITE_ENABLE_API_ARMOR 2133 if( !sqlite3SafetyCheckOk(db) ){ 2134 (void)SQLITE_MISUSE_BKPT; 2135 return 0; 2136 } 2137 #endif 2138 sqlite3_mutex_enter(db->mutex); 2139 pRet = db->pRollbackArg; 2140 db->xRollbackCallback = xCallback; 2141 db->pRollbackArg = pArg; 2142 sqlite3_mutex_leave(db->mutex); 2143 return pRet; 2144 } 2145 2146 #ifdef SQLITE_ENABLE_PREUPDATE_HOOK 2147 /* 2148 ** Register a callback to be invoked each time a row is updated, 2149 ** inserted or deleted using this database connection. 2150 */ 2151 void *sqlite3_preupdate_hook( 2152 sqlite3 *db, /* Attach the hook to this database */ 2153 void(*xCallback)( /* Callback function */ 2154 void*,sqlite3*,int,char const*,char const*,sqlite3_int64,sqlite3_int64), 2155 void *pArg /* First callback argument */ 2156 ){ 2157 void *pRet; 2158 sqlite3_mutex_enter(db->mutex); 2159 pRet = db->pPreUpdateArg; 2160 db->xPreUpdateCallback = xCallback; 2161 db->pPreUpdateArg = pArg; 2162 sqlite3_mutex_leave(db->mutex); 2163 return pRet; 2164 } 2165 #endif /* SQLITE_ENABLE_PREUPDATE_HOOK */ 2166 2167 #ifndef SQLITE_OMIT_WAL 2168 /* 2169 ** The sqlite3_wal_hook() callback registered by sqlite3_wal_autocheckpoint(). 2170 ** Invoke sqlite3_wal_checkpoint if the number of frames in the log file 2171 ** is greater than sqlite3.pWalArg cast to an integer (the value configured by 2172 ** wal_autocheckpoint()). 2173 */ 2174 int sqlite3WalDefaultHook( 2175 void *pClientData, /* Argument */ 2176 sqlite3 *db, /* Connection */ 2177 const char *zDb, /* Database */ 2178 int nFrame /* Size of WAL */ 2179 ){ 2180 if( nFrame>=SQLITE_PTR_TO_INT(pClientData) ){ 2181 sqlite3BeginBenignMalloc(); 2182 sqlite3_wal_checkpoint(db, zDb); 2183 sqlite3EndBenignMalloc(); 2184 } 2185 return SQLITE_OK; 2186 } 2187 #endif /* SQLITE_OMIT_WAL */ 2188 2189 /* 2190 ** Configure an sqlite3_wal_hook() callback to automatically checkpoint 2191 ** a database after committing a transaction if there are nFrame or 2192 ** more frames in the log file. Passing zero or a negative value as the 2193 ** nFrame parameter disables automatic checkpoints entirely. 2194 ** 2195 ** The callback registered by this function replaces any existing callback 2196 ** registered using sqlite3_wal_hook(). Likewise, registering a callback 2197 ** using sqlite3_wal_hook() disables the automatic checkpoint mechanism 2198 ** configured by this function. 2199 */ 2200 int sqlite3_wal_autocheckpoint(sqlite3 *db, int nFrame){ 2201 #ifdef SQLITE_OMIT_WAL 2202 UNUSED_PARAMETER(db); 2203 UNUSED_PARAMETER(nFrame); 2204 #else 2205 #ifdef SQLITE_ENABLE_API_ARMOR 2206 if( !sqlite3SafetyCheckOk(db) ) return SQLITE_MISUSE_BKPT; 2207 #endif 2208 if( nFrame>0 ){ 2209 sqlite3_wal_hook(db, sqlite3WalDefaultHook, SQLITE_INT_TO_PTR(nFrame)); 2210 }else{ 2211 sqlite3_wal_hook(db, 0, 0); 2212 } 2213 #endif 2214 return SQLITE_OK; 2215 } 2216 2217 /* 2218 ** Register a callback to be invoked each time a transaction is written 2219 ** into the write-ahead-log by this database connection. 2220 */ 2221 void *sqlite3_wal_hook( 2222 sqlite3 *db, /* Attach the hook to this db handle */ 2223 int(*xCallback)(void *, sqlite3*, const char*, int), 2224 void *pArg /* First argument passed to xCallback() */ 2225 ){ 2226 #ifndef SQLITE_OMIT_WAL 2227 void *pRet; 2228 #ifdef SQLITE_ENABLE_API_ARMOR 2229 if( !sqlite3SafetyCheckOk(db) ){ 2230 (void)SQLITE_MISUSE_BKPT; 2231 return 0; 2232 } 2233 #endif 2234 sqlite3_mutex_enter(db->mutex); 2235 pRet = db->pWalArg; 2236 db->xWalCallback = xCallback; 2237 db->pWalArg = pArg; 2238 sqlite3_mutex_leave(db->mutex); 2239 return pRet; 2240 #else 2241 return 0; 2242 #endif 2243 } 2244 2245 /* 2246 ** Checkpoint database zDb. 2247 */ 2248 int sqlite3_wal_checkpoint_v2( 2249 sqlite3 *db, /* Database handle */ 2250 const char *zDb, /* Name of attached database (or NULL) */ 2251 int eMode, /* SQLITE_CHECKPOINT_* value */ 2252 int *pnLog, /* OUT: Size of WAL log in frames */ 2253 int *pnCkpt /* OUT: Total number of frames checkpointed */ 2254 ){ 2255 #ifdef SQLITE_OMIT_WAL 2256 return SQLITE_OK; 2257 #else 2258 int rc; /* Return code */ 2259 int iDb = SQLITE_MAX_ATTACHED; /* sqlite3.aDb[] index of db to checkpoint */ 2260 2261 #ifdef SQLITE_ENABLE_API_ARMOR 2262 if( !sqlite3SafetyCheckOk(db) ) return SQLITE_MISUSE_BKPT; 2263 #endif 2264 2265 /* Initialize the output variables to -1 in case an error occurs. */ 2266 if( pnLog ) *pnLog = -1; 2267 if( pnCkpt ) *pnCkpt = -1; 2268 2269 assert( SQLITE_CHECKPOINT_PASSIVE==0 ); 2270 assert( SQLITE_CHECKPOINT_FULL==1 ); 2271 assert( SQLITE_CHECKPOINT_RESTART==2 ); 2272 assert( SQLITE_CHECKPOINT_TRUNCATE==3 ); 2273 if( eMode<SQLITE_CHECKPOINT_PASSIVE || eMode>SQLITE_CHECKPOINT_TRUNCATE ){ 2274 /* EVIDENCE-OF: R-03996-12088 The M parameter must be a valid checkpoint 2275 ** mode: */ 2276 return SQLITE_MISUSE; 2277 } 2278 2279 sqlite3_mutex_enter(db->mutex); 2280 if( zDb && zDb[0] ){ 2281 iDb = sqlite3FindDbName(db, zDb); 2282 } 2283 if( iDb<0 ){ 2284 rc = SQLITE_ERROR; 2285 sqlite3ErrorWithMsg(db, SQLITE_ERROR, "unknown database: %s", zDb); 2286 }else{ 2287 db->busyHandler.nBusy = 0; 2288 rc = sqlite3Checkpoint(db, iDb, eMode, pnLog, pnCkpt); 2289 sqlite3Error(db, rc); 2290 } 2291 rc = sqlite3ApiExit(db, rc); 2292 2293 /* If there are no active statements, clear the interrupt flag at this 2294 ** point. */ 2295 if( db->nVdbeActive==0 ){ 2296 db->u1.isInterrupted = 0; 2297 } 2298 2299 sqlite3_mutex_leave(db->mutex); 2300 return rc; 2301 #endif 2302 } 2303 2304 2305 /* 2306 ** Checkpoint database zDb. If zDb is NULL, or if the buffer zDb points 2307 ** to contains a zero-length string, all attached databases are 2308 ** checkpointed. 2309 */ 2310 int sqlite3_wal_checkpoint(sqlite3 *db, const char *zDb){ 2311 /* EVIDENCE-OF: R-41613-20553 The sqlite3_wal_checkpoint(D,X) is equivalent to 2312 ** sqlite3_wal_checkpoint_v2(D,X,SQLITE_CHECKPOINT_PASSIVE,0,0). */ 2313 return sqlite3_wal_checkpoint_v2(db,zDb,SQLITE_CHECKPOINT_PASSIVE,0,0); 2314 } 2315 2316 #ifndef SQLITE_OMIT_WAL 2317 /* 2318 ** Run a checkpoint on database iDb. This is a no-op if database iDb is 2319 ** not currently open in WAL mode. 2320 ** 2321 ** If a transaction is open on the database being checkpointed, this 2322 ** function returns SQLITE_LOCKED and a checkpoint is not attempted. If 2323 ** an error occurs while running the checkpoint, an SQLite error code is 2324 ** returned (i.e. SQLITE_IOERR). Otherwise, SQLITE_OK. 2325 ** 2326 ** The mutex on database handle db should be held by the caller. The mutex 2327 ** associated with the specific b-tree being checkpointed is taken by 2328 ** this function while the checkpoint is running. 2329 ** 2330 ** If iDb is passed SQLITE_MAX_ATTACHED, then all attached databases are 2331 ** checkpointed. If an error is encountered it is returned immediately - 2332 ** no attempt is made to checkpoint any remaining databases. 2333 ** 2334 ** Parameter eMode is one of SQLITE_CHECKPOINT_PASSIVE, FULL, RESTART 2335 ** or TRUNCATE. 2336 */ 2337 int sqlite3Checkpoint(sqlite3 *db, int iDb, int eMode, int *pnLog, int *pnCkpt){ 2338 int rc = SQLITE_OK; /* Return code */ 2339 int i; /* Used to iterate through attached dbs */ 2340 int bBusy = 0; /* True if SQLITE_BUSY has been encountered */ 2341 2342 assert( sqlite3_mutex_held(db->mutex) ); 2343 assert( !pnLog || *pnLog==-1 ); 2344 assert( !pnCkpt || *pnCkpt==-1 ); 2345 2346 for(i=0; i<db->nDb && rc==SQLITE_OK; i++){ 2347 if( i==iDb || iDb==SQLITE_MAX_ATTACHED ){ 2348 rc = sqlite3BtreeCheckpoint(db->aDb[i].pBt, eMode, pnLog, pnCkpt); 2349 pnLog = 0; 2350 pnCkpt = 0; 2351 if( rc==SQLITE_BUSY ){ 2352 bBusy = 1; 2353 rc = SQLITE_OK; 2354 } 2355 } 2356 } 2357 2358 return (rc==SQLITE_OK && bBusy) ? SQLITE_BUSY : rc; 2359 } 2360 #endif /* SQLITE_OMIT_WAL */ 2361 2362 /* 2363 ** This function returns true if main-memory should be used instead of 2364 ** a temporary file for transient pager files and statement journals. 2365 ** The value returned depends on the value of db->temp_store (runtime 2366 ** parameter) and the compile time value of SQLITE_TEMP_STORE. The 2367 ** following table describes the relationship between these two values 2368 ** and this functions return value. 2369 ** 2370 ** SQLITE_TEMP_STORE db->temp_store Location of temporary database 2371 ** ----------------- -------------- ------------------------------ 2372 ** 0 any file (return 0) 2373 ** 1 1 file (return 0) 2374 ** 1 2 memory (return 1) 2375 ** 1 0 file (return 0) 2376 ** 2 1 file (return 0) 2377 ** 2 2 memory (return 1) 2378 ** 2 0 memory (return 1) 2379 ** 3 any memory (return 1) 2380 */ 2381 int sqlite3TempInMemory(const sqlite3 *db){ 2382 #if SQLITE_TEMP_STORE==1 2383 return ( db->temp_store==2 ); 2384 #endif 2385 #if SQLITE_TEMP_STORE==2 2386 return ( db->temp_store!=1 ); 2387 #endif 2388 #if SQLITE_TEMP_STORE==3 2389 UNUSED_PARAMETER(db); 2390 return 1; 2391 #endif 2392 #if SQLITE_TEMP_STORE<1 || SQLITE_TEMP_STORE>3 2393 UNUSED_PARAMETER(db); 2394 return 0; 2395 #endif 2396 } 2397 2398 /* 2399 ** Return UTF-8 encoded English language explanation of the most recent 2400 ** error. 2401 */ 2402 const char *sqlite3_errmsg(sqlite3 *db){ 2403 const char *z; 2404 if( !db ){ 2405 return sqlite3ErrStr(SQLITE_NOMEM_BKPT); 2406 } 2407 if( !sqlite3SafetyCheckSickOrOk(db) ){ 2408 return sqlite3ErrStr(SQLITE_MISUSE_BKPT); 2409 } 2410 sqlite3_mutex_enter(db->mutex); 2411 if( db->mallocFailed ){ 2412 z = sqlite3ErrStr(SQLITE_NOMEM_BKPT); 2413 }else{ 2414 testcase( db->pErr==0 ); 2415 z = db->errCode ? (char*)sqlite3_value_text(db->pErr) : 0; 2416 assert( !db->mallocFailed ); 2417 if( z==0 ){ 2418 z = sqlite3ErrStr(db->errCode); 2419 } 2420 } 2421 sqlite3_mutex_leave(db->mutex); 2422 return z; 2423 } 2424 2425 #ifndef SQLITE_OMIT_UTF16 2426 /* 2427 ** Return UTF-16 encoded English language explanation of the most recent 2428 ** error. 2429 */ 2430 const void *sqlite3_errmsg16(sqlite3 *db){ 2431 static const u16 outOfMem[] = { 2432 'o', 'u', 't', ' ', 'o', 'f', ' ', 'm', 'e', 'm', 'o', 'r', 'y', 0 2433 }; 2434 static const u16 misuse[] = { 2435 'b', 'a', 'd', ' ', 'p', 'a', 'r', 'a', 'm', 'e', 't', 'e', 'r', ' ', 2436 'o', 'r', ' ', 'o', 't', 'h', 'e', 'r', ' ', 'A', 'P', 'I', ' ', 2437 'm', 'i', 's', 'u', 's', 'e', 0 2438 }; 2439 2440 const void *z; 2441 if( !db ){ 2442 return (void *)outOfMem; 2443 } 2444 if( !sqlite3SafetyCheckSickOrOk(db) ){ 2445 return (void *)misuse; 2446 } 2447 sqlite3_mutex_enter(db->mutex); 2448 if( db->mallocFailed ){ 2449 z = (void *)outOfMem; 2450 }else{ 2451 z = sqlite3_value_text16(db->pErr); 2452 if( z==0 ){ 2453 sqlite3ErrorWithMsg(db, db->errCode, sqlite3ErrStr(db->errCode)); 2454 z = sqlite3_value_text16(db->pErr); 2455 } 2456 /* A malloc() may have failed within the call to sqlite3_value_text16() 2457 ** above. If this is the case, then the db->mallocFailed flag needs to 2458 ** be cleared before returning. Do this directly, instead of via 2459 ** sqlite3ApiExit(), to avoid setting the database handle error message. 2460 */ 2461 sqlite3OomClear(db); 2462 } 2463 sqlite3_mutex_leave(db->mutex); 2464 return z; 2465 } 2466 #endif /* SQLITE_OMIT_UTF16 */ 2467 2468 /* 2469 ** Return the most recent error code generated by an SQLite routine. If NULL is 2470 ** passed to this function, we assume a malloc() failed during sqlite3_open(). 2471 */ 2472 int sqlite3_errcode(sqlite3 *db){ 2473 if( db && !sqlite3SafetyCheckSickOrOk(db) ){ 2474 return SQLITE_MISUSE_BKPT; 2475 } 2476 if( !db || db->mallocFailed ){ 2477 return SQLITE_NOMEM_BKPT; 2478 } 2479 return db->errCode & db->errMask; 2480 } 2481 int sqlite3_extended_errcode(sqlite3 *db){ 2482 if( db && !sqlite3SafetyCheckSickOrOk(db) ){ 2483 return SQLITE_MISUSE_BKPT; 2484 } 2485 if( !db || db->mallocFailed ){ 2486 return SQLITE_NOMEM_BKPT; 2487 } 2488 return db->errCode; 2489 } 2490 int sqlite3_system_errno(sqlite3 *db){ 2491 return db ? db->iSysErrno : 0; 2492 } 2493 2494 /* 2495 ** Return a string that describes the kind of error specified in the 2496 ** argument. For now, this simply calls the internal sqlite3ErrStr() 2497 ** function. 2498 */ 2499 const char *sqlite3_errstr(int rc){ 2500 return sqlite3ErrStr(rc); 2501 } 2502 2503 /* 2504 ** Create a new collating function for database "db". The name is zName 2505 ** and the encoding is enc. 2506 */ 2507 static int createCollation( 2508 sqlite3* db, 2509 const char *zName, 2510 u8 enc, 2511 void* pCtx, 2512 int(*xCompare)(void*,int,const void*,int,const void*), 2513 void(*xDel)(void*) 2514 ){ 2515 CollSeq *pColl; 2516 int enc2; 2517 2518 assert( sqlite3_mutex_held(db->mutex) ); 2519 2520 /* If SQLITE_UTF16 is specified as the encoding type, transform this 2521 ** to one of SQLITE_UTF16LE or SQLITE_UTF16BE using the 2522 ** SQLITE_UTF16NATIVE macro. SQLITE_UTF16 is not used internally. 2523 */ 2524 enc2 = enc; 2525 testcase( enc2==SQLITE_UTF16 ); 2526 testcase( enc2==SQLITE_UTF16_ALIGNED ); 2527 if( enc2==SQLITE_UTF16 || enc2==SQLITE_UTF16_ALIGNED ){ 2528 enc2 = SQLITE_UTF16NATIVE; 2529 } 2530 if( enc2<SQLITE_UTF8 || enc2>SQLITE_UTF16BE ){ 2531 return SQLITE_MISUSE_BKPT; 2532 } 2533 2534 /* Check if this call is removing or replacing an existing collation 2535 ** sequence. If so, and there are active VMs, return busy. If there 2536 ** are no active VMs, invalidate any pre-compiled statements. 2537 */ 2538 pColl = sqlite3FindCollSeq(db, (u8)enc2, zName, 0); 2539 if( pColl && pColl->xCmp ){ 2540 if( db->nVdbeActive ){ 2541 sqlite3ErrorWithMsg(db, SQLITE_BUSY, 2542 "unable to delete/modify collation sequence due to active statements"); 2543 return SQLITE_BUSY; 2544 } 2545 sqlite3ExpirePreparedStatements(db, 0); 2546 2547 /* If collation sequence pColl was created directly by a call to 2548 ** sqlite3_create_collation, and not generated by synthCollSeq(), 2549 ** then any copies made by synthCollSeq() need to be invalidated. 2550 ** Also, collation destructor - CollSeq.xDel() - function may need 2551 ** to be called. 2552 */ 2553 if( (pColl->enc & ~SQLITE_UTF16_ALIGNED)==enc2 ){ 2554 CollSeq *aColl = sqlite3HashFind(&db->aCollSeq, zName); 2555 int j; 2556 for(j=0; j<3; j++){ 2557 CollSeq *p = &aColl[j]; 2558 if( p->enc==pColl->enc ){ 2559 if( p->xDel ){ 2560 p->xDel(p->pUser); 2561 } 2562 p->xCmp = 0; 2563 } 2564 } 2565 } 2566 } 2567 2568 pColl = sqlite3FindCollSeq(db, (u8)enc2, zName, 1); 2569 if( pColl==0 ) return SQLITE_NOMEM_BKPT; 2570 pColl->xCmp = xCompare; 2571 pColl->pUser = pCtx; 2572 pColl->xDel = xDel; 2573 pColl->enc = (u8)(enc2 | (enc & SQLITE_UTF16_ALIGNED)); 2574 sqlite3Error(db, SQLITE_OK); 2575 return SQLITE_OK; 2576 } 2577 2578 2579 /* 2580 ** This array defines hard upper bounds on limit values. The 2581 ** initializer must be kept in sync with the SQLITE_LIMIT_* 2582 ** #defines in sqlite3.h. 2583 */ 2584 static const int aHardLimit[] = { 2585 SQLITE_MAX_LENGTH, 2586 SQLITE_MAX_SQL_LENGTH, 2587 SQLITE_MAX_COLUMN, 2588 SQLITE_MAX_EXPR_DEPTH, 2589 SQLITE_MAX_COMPOUND_SELECT, 2590 SQLITE_MAX_VDBE_OP, 2591 SQLITE_MAX_FUNCTION_ARG, 2592 SQLITE_MAX_ATTACHED, 2593 SQLITE_MAX_LIKE_PATTERN_LENGTH, 2594 SQLITE_MAX_VARIABLE_NUMBER, /* IMP: R-38091-32352 */ 2595 SQLITE_MAX_TRIGGER_DEPTH, 2596 SQLITE_MAX_WORKER_THREADS, 2597 }; 2598 2599 /* 2600 ** Make sure the hard limits are set to reasonable values 2601 */ 2602 #if SQLITE_MAX_LENGTH<100 2603 # error SQLITE_MAX_LENGTH must be at least 100 2604 #endif 2605 #if SQLITE_MAX_SQL_LENGTH<100 2606 # error SQLITE_MAX_SQL_LENGTH must be at least 100 2607 #endif 2608 #if SQLITE_MAX_SQL_LENGTH>SQLITE_MAX_LENGTH 2609 # error SQLITE_MAX_SQL_LENGTH must not be greater than SQLITE_MAX_LENGTH 2610 #endif 2611 #if SQLITE_MAX_COMPOUND_SELECT<2 2612 # error SQLITE_MAX_COMPOUND_SELECT must be at least 2 2613 #endif 2614 #if SQLITE_MAX_VDBE_OP<40 2615 # error SQLITE_MAX_VDBE_OP must be at least 40 2616 #endif 2617 #if SQLITE_MAX_FUNCTION_ARG<0 || SQLITE_MAX_FUNCTION_ARG>127 2618 # error SQLITE_MAX_FUNCTION_ARG must be between 0 and 127 2619 #endif 2620 #if SQLITE_MAX_ATTACHED<0 || SQLITE_MAX_ATTACHED>125 2621 # error SQLITE_MAX_ATTACHED must be between 0 and 125 2622 #endif 2623 #if SQLITE_MAX_LIKE_PATTERN_LENGTH<1 2624 # error SQLITE_MAX_LIKE_PATTERN_LENGTH must be at least 1 2625 #endif 2626 #if SQLITE_MAX_COLUMN>32767 2627 # error SQLITE_MAX_COLUMN must not exceed 32767 2628 #endif 2629 #if SQLITE_MAX_TRIGGER_DEPTH<1 2630 # error SQLITE_MAX_TRIGGER_DEPTH must be at least 1 2631 #endif 2632 #if SQLITE_MAX_WORKER_THREADS<0 || SQLITE_MAX_WORKER_THREADS>50 2633 # error SQLITE_MAX_WORKER_THREADS must be between 0 and 50 2634 #endif 2635 2636 2637 /* 2638 ** Change the value of a limit. Report the old value. 2639 ** If an invalid limit index is supplied, report -1. 2640 ** Make no changes but still report the old value if the 2641 ** new limit is negative. 2642 ** 2643 ** A new lower limit does not shrink existing constructs. 2644 ** It merely prevents new constructs that exceed the limit 2645 ** from forming. 2646 */ 2647 int sqlite3_limit(sqlite3 *db, int limitId, int newLimit){ 2648 int oldLimit; 2649 2650 #ifdef SQLITE_ENABLE_API_ARMOR 2651 if( !sqlite3SafetyCheckOk(db) ){ 2652 (void)SQLITE_MISUSE_BKPT; 2653 return -1; 2654 } 2655 #endif 2656 2657 /* EVIDENCE-OF: R-30189-54097 For each limit category SQLITE_LIMIT_NAME 2658 ** there is a hard upper bound set at compile-time by a C preprocessor 2659 ** macro called SQLITE_MAX_NAME. (The "_LIMIT_" in the name is changed to 2660 ** "_MAX_".) 2661 */ 2662 assert( aHardLimit[SQLITE_LIMIT_LENGTH]==SQLITE_MAX_LENGTH ); 2663 assert( aHardLimit[SQLITE_LIMIT_SQL_LENGTH]==SQLITE_MAX_SQL_LENGTH ); 2664 assert( aHardLimit[SQLITE_LIMIT_COLUMN]==SQLITE_MAX_COLUMN ); 2665 assert( aHardLimit[SQLITE_LIMIT_EXPR_DEPTH]==SQLITE_MAX_EXPR_DEPTH ); 2666 assert( aHardLimit[SQLITE_LIMIT_COMPOUND_SELECT]==SQLITE_MAX_COMPOUND_SELECT); 2667 assert( aHardLimit[SQLITE_LIMIT_VDBE_OP]==SQLITE_MAX_VDBE_OP ); 2668 assert( aHardLimit[SQLITE_LIMIT_FUNCTION_ARG]==SQLITE_MAX_FUNCTION_ARG ); 2669 assert( aHardLimit[SQLITE_LIMIT_ATTACHED]==SQLITE_MAX_ATTACHED ); 2670 assert( aHardLimit[SQLITE_LIMIT_LIKE_PATTERN_LENGTH]== 2671 SQLITE_MAX_LIKE_PATTERN_LENGTH ); 2672 assert( aHardLimit[SQLITE_LIMIT_VARIABLE_NUMBER]==SQLITE_MAX_VARIABLE_NUMBER); 2673 assert( aHardLimit[SQLITE_LIMIT_TRIGGER_DEPTH]==SQLITE_MAX_TRIGGER_DEPTH ); 2674 assert( aHardLimit[SQLITE_LIMIT_WORKER_THREADS]==SQLITE_MAX_WORKER_THREADS ); 2675 assert( SQLITE_LIMIT_WORKER_THREADS==(SQLITE_N_LIMIT-1) ); 2676 2677 2678 if( limitId<0 || limitId>=SQLITE_N_LIMIT ){ 2679 return -1; 2680 } 2681 oldLimit = db->aLimit[limitId]; 2682 if( newLimit>=0 ){ /* IMP: R-52476-28732 */ 2683 if( newLimit>aHardLimit[limitId] ){ 2684 newLimit = aHardLimit[limitId]; /* IMP: R-51463-25634 */ 2685 } 2686 db->aLimit[limitId] = newLimit; 2687 } 2688 return oldLimit; /* IMP: R-53341-35419 */ 2689 } 2690 2691 /* 2692 ** This function is used to parse both URIs and non-URI filenames passed by the 2693 ** user to API functions sqlite3_open() or sqlite3_open_v2(), and for database 2694 ** URIs specified as part of ATTACH statements. 2695 ** 2696 ** The first argument to this function is the name of the VFS to use (or 2697 ** a NULL to signify the default VFS) if the URI does not contain a "vfs=xxx" 2698 ** query parameter. The second argument contains the URI (or non-URI filename) 2699 ** itself. When this function is called the *pFlags variable should contain 2700 ** the default flags to open the database handle with. The value stored in 2701 ** *pFlags may be updated before returning if the URI filename contains 2702 ** "cache=xxx" or "mode=xxx" query parameters. 2703 ** 2704 ** If successful, SQLITE_OK is returned. In this case *ppVfs is set to point to 2705 ** the VFS that should be used to open the database file. *pzFile is set to 2706 ** point to a buffer containing the name of the file to open. It is the 2707 ** responsibility of the caller to eventually call sqlite3_free() to release 2708 ** this buffer. 2709 ** 2710 ** If an error occurs, then an SQLite error code is returned and *pzErrMsg 2711 ** may be set to point to a buffer containing an English language error 2712 ** message. It is the responsibility of the caller to eventually release 2713 ** this buffer by calling sqlite3_free(). 2714 */ 2715 int sqlite3ParseUri( 2716 const char *zDefaultVfs, /* VFS to use if no "vfs=xxx" query option */ 2717 const char *zUri, /* Nul-terminated URI to parse */ 2718 unsigned int *pFlags, /* IN/OUT: SQLITE_OPEN_XXX flags */ 2719 sqlite3_vfs **ppVfs, /* OUT: VFS to use */ 2720 char **pzFile, /* OUT: Filename component of URI */ 2721 char **pzErrMsg /* OUT: Error message (if rc!=SQLITE_OK) */ 2722 ){ 2723 int rc = SQLITE_OK; 2724 unsigned int flags = *pFlags; 2725 const char *zVfs = zDefaultVfs; 2726 char *zFile; 2727 char c; 2728 int nUri = sqlite3Strlen30(zUri); 2729 2730 assert( *pzErrMsg==0 ); 2731 2732 if( ((flags & SQLITE_OPEN_URI) /* IMP: R-48725-32206 */ 2733 || sqlite3GlobalConfig.bOpenUri) /* IMP: R-51689-46548 */ 2734 && nUri>=5 && memcmp(zUri, "file:", 5)==0 /* IMP: R-57884-37496 */ 2735 ){ 2736 char *zOpt; 2737 int eState; /* Parser state when parsing URI */ 2738 int iIn; /* Input character index */ 2739 int iOut = 0; /* Output character index */ 2740 u64 nByte = nUri+2; /* Bytes of space to allocate */ 2741 2742 /* Make sure the SQLITE_OPEN_URI flag is set to indicate to the VFS xOpen 2743 ** method that there may be extra parameters following the file-name. */ 2744 flags |= SQLITE_OPEN_URI; 2745 2746 for(iIn=0; iIn<nUri; iIn++) nByte += (zUri[iIn]=='&'); 2747 zFile = sqlite3_malloc64(nByte); 2748 if( !zFile ) return SQLITE_NOMEM_BKPT; 2749 2750 iIn = 5; 2751 #ifdef SQLITE_ALLOW_URI_AUTHORITY 2752 if( strncmp(zUri+5, "///", 3)==0 ){ 2753 iIn = 7; 2754 /* The following condition causes URIs with five leading / characters 2755 ** like file://///host/path to be converted into UNCs like //host/path. 2756 ** The correct URI for that UNC has only two or four leading / characters 2757 ** file://host/path or file:////host/path. But 5 leading slashes is a 2758 ** common error, we are told, so we handle it as a special case. */ 2759 if( strncmp(zUri+7, "///", 3)==0 ){ iIn++; } 2760 }else if( strncmp(zUri+5, "//localhost/", 12)==0 ){ 2761 iIn = 16; 2762 } 2763 #else 2764 /* Discard the scheme and authority segments of the URI. */ 2765 if( zUri[5]=='/' && zUri[6]=='/' ){ 2766 iIn = 7; 2767 while( zUri[iIn] && zUri[iIn]!='/' ) iIn++; 2768 if( iIn!=7 && (iIn!=16 || memcmp("localhost", &zUri[7], 9)) ){ 2769 *pzErrMsg = sqlite3_mprintf("invalid uri authority: %.*s", 2770 iIn-7, &zUri[7]); 2771 rc = SQLITE_ERROR; 2772 goto parse_uri_out; 2773 } 2774 } 2775 #endif 2776 2777 /* Copy the filename and any query parameters into the zFile buffer. 2778 ** Decode %HH escape codes along the way. 2779 ** 2780 ** Within this loop, variable eState may be set to 0, 1 or 2, depending 2781 ** on the parsing context. As follows: 2782 ** 2783 ** 0: Parsing file-name. 2784 ** 1: Parsing name section of a name=value query parameter. 2785 ** 2: Parsing value section of a name=value query parameter. 2786 */ 2787 eState = 0; 2788 while( (c = zUri[iIn])!=0 && c!='#' ){ 2789 iIn++; 2790 if( c=='%' 2791 && sqlite3Isxdigit(zUri[iIn]) 2792 && sqlite3Isxdigit(zUri[iIn+1]) 2793 ){ 2794 int octet = (sqlite3HexToInt(zUri[iIn++]) << 4); 2795 octet += sqlite3HexToInt(zUri[iIn++]); 2796 2797 assert( octet>=0 && octet<256 ); 2798 if( octet==0 ){ 2799 #ifndef SQLITE_ENABLE_URI_00_ERROR 2800 /* This branch is taken when "%00" appears within the URI. In this 2801 ** case we ignore all text in the remainder of the path, name or 2802 ** value currently being parsed. So ignore the current character 2803 ** and skip to the next "?", "=" or "&", as appropriate. */ 2804 while( (c = zUri[iIn])!=0 && c!='#' 2805 && (eState!=0 || c!='?') 2806 && (eState!=1 || (c!='=' && c!='&')) 2807 && (eState!=2 || c!='&') 2808 ){ 2809 iIn++; 2810 } 2811 continue; 2812 #else 2813 /* If ENABLE_URI_00_ERROR is defined, "%00" in a URI is an error. */ 2814 *pzErrMsg = sqlite3_mprintf("unexpected %%00 in uri"); 2815 rc = SQLITE_ERROR; 2816 goto parse_uri_out; 2817 #endif 2818 } 2819 c = octet; 2820 }else if( eState==1 && (c=='&' || c=='=') ){ 2821 if( zFile[iOut-1]==0 ){ 2822 /* An empty option name. Ignore this option altogether. */ 2823 while( zUri[iIn] && zUri[iIn]!='#' && zUri[iIn-1]!='&' ) iIn++; 2824 continue; 2825 } 2826 if( c=='&' ){ 2827 zFile[iOut++] = '\0'; 2828 }else{ 2829 eState = 2; 2830 } 2831 c = 0; 2832 }else if( (eState==0 && c=='?') || (eState==2 && c=='&') ){ 2833 c = 0; 2834 eState = 1; 2835 } 2836 zFile[iOut++] = c; 2837 } 2838 if( eState==1 ) zFile[iOut++] = '\0'; 2839 zFile[iOut++] = '\0'; 2840 zFile[iOut++] = '\0'; 2841 2842 /* Check if there were any options specified that should be interpreted 2843 ** here. Options that are interpreted here include "vfs" and those that 2844 ** correspond to flags that may be passed to the sqlite3_open_v2() 2845 ** method. */ 2846 zOpt = &zFile[sqlite3Strlen30(zFile)+1]; 2847 while( zOpt[0] ){ 2848 int nOpt = sqlite3Strlen30(zOpt); 2849 char *zVal = &zOpt[nOpt+1]; 2850 int nVal = sqlite3Strlen30(zVal); 2851 2852 if( nOpt==3 && memcmp("vfs", zOpt, 3)==0 ){ 2853 zVfs = zVal; 2854 }else{ 2855 struct OpenMode { 2856 const char *z; 2857 int mode; 2858 } *aMode = 0; 2859 char *zModeType = 0; 2860 int mask = 0; 2861 int limit = 0; 2862 2863 if( nOpt==5 && memcmp("cache", zOpt, 5)==0 ){ 2864 static struct OpenMode aCacheMode[] = { 2865 { "shared", SQLITE_OPEN_SHAREDCACHE }, 2866 { "private", SQLITE_OPEN_PRIVATECACHE }, 2867 { 0, 0 } 2868 }; 2869 2870 mask = SQLITE_OPEN_SHAREDCACHE|SQLITE_OPEN_PRIVATECACHE; 2871 aMode = aCacheMode; 2872 limit = mask; 2873 zModeType = "cache"; 2874 } 2875 if( nOpt==4 && memcmp("mode", zOpt, 4)==0 ){ 2876 static struct OpenMode aOpenMode[] = { 2877 { "ro", SQLITE_OPEN_READONLY }, 2878 { "rw", SQLITE_OPEN_READWRITE }, 2879 { "rwc", SQLITE_OPEN_READWRITE | SQLITE_OPEN_CREATE }, 2880 { "memory", SQLITE_OPEN_MEMORY }, 2881 { 0, 0 } 2882 }; 2883 2884 mask = SQLITE_OPEN_READONLY | SQLITE_OPEN_READWRITE 2885 | SQLITE_OPEN_CREATE | SQLITE_OPEN_MEMORY; 2886 aMode = aOpenMode; 2887 limit = mask & flags; 2888 zModeType = "access"; 2889 } 2890 2891 if( aMode ){ 2892 int i; 2893 int mode = 0; 2894 for(i=0; aMode[i].z; i++){ 2895 const char *z = aMode[i].z; 2896 if( nVal==sqlite3Strlen30(z) && 0==memcmp(zVal, z, nVal) ){ 2897 mode = aMode[i].mode; 2898 break; 2899 } 2900 } 2901 if( mode==0 ){ 2902 *pzErrMsg = sqlite3_mprintf("no such %s mode: %s", zModeType, zVal); 2903 rc = SQLITE_ERROR; 2904 goto parse_uri_out; 2905 } 2906 if( (mode & ~SQLITE_OPEN_MEMORY)>limit ){ 2907 *pzErrMsg = sqlite3_mprintf("%s mode not allowed: %s", 2908 zModeType, zVal); 2909 rc = SQLITE_PERM; 2910 goto parse_uri_out; 2911 } 2912 flags = (flags & ~mask) | mode; 2913 } 2914 } 2915 2916 zOpt = &zVal[nVal+1]; 2917 } 2918 2919 }else{ 2920 zFile = sqlite3_malloc64(nUri+2); 2921 if( !zFile ) return SQLITE_NOMEM_BKPT; 2922 if( nUri ){ 2923 memcpy(zFile, zUri, nUri); 2924 } 2925 zFile[nUri] = '\0'; 2926 zFile[nUri+1] = '\0'; 2927 flags &= ~SQLITE_OPEN_URI; 2928 } 2929 2930 *ppVfs = sqlite3_vfs_find(zVfs); 2931 if( *ppVfs==0 ){ 2932 *pzErrMsg = sqlite3_mprintf("no such vfs: %s", zVfs); 2933 rc = SQLITE_ERROR; 2934 } 2935 parse_uri_out: 2936 if( rc!=SQLITE_OK ){ 2937 sqlite3_free(zFile); 2938 zFile = 0; 2939 } 2940 *pFlags = flags; 2941 *pzFile = zFile; 2942 return rc; 2943 } 2944 2945 #if defined(SQLITE_HAS_CODEC) 2946 /* 2947 ** Process URI filename query parameters relevant to the SQLite Encryption 2948 ** Extension. Return true if any of the relevant query parameters are 2949 ** seen and return false if not. 2950 */ 2951 int sqlite3CodecQueryParameters( 2952 sqlite3 *db, /* Database connection */ 2953 const char *zDb, /* Which schema is being created/attached */ 2954 const char *zUri /* URI filename */ 2955 ){ 2956 const char *zKey; 2957 if( (zKey = sqlite3_uri_parameter(zUri, "hexkey"))!=0 && zKey[0] ){ 2958 u8 iByte; 2959 int i; 2960 char zDecoded[40]; 2961 for(i=0, iByte=0; i<sizeof(zDecoded)*2 && sqlite3Isxdigit(zKey[i]); i++){ 2962 iByte = (iByte<<4) + sqlite3HexToInt(zKey[i]); 2963 if( (i&1)!=0 ) zDecoded[i/2] = iByte; 2964 } 2965 sqlite3_key_v2(db, zDb, zDecoded, i/2); 2966 return 1; 2967 }else if( (zKey = sqlite3_uri_parameter(zUri, "key"))!=0 ){ 2968 sqlite3_key_v2(db, zDb, zKey, sqlite3Strlen30(zKey)); 2969 return 1; 2970 }else if( (zKey = sqlite3_uri_parameter(zUri, "textkey"))!=0 ){ 2971 sqlite3_key_v2(db, zDb, zKey, -1); 2972 return 1; 2973 }else{ 2974 return 0; 2975 } 2976 } 2977 #endif 2978 2979 2980 /* 2981 ** This routine does the work of opening a database on behalf of 2982 ** sqlite3_open() and sqlite3_open16(). The database filename "zFilename" 2983 ** is UTF-8 encoded. 2984 */ 2985 static int openDatabase( 2986 const char *zFilename, /* Database filename UTF-8 encoded */ 2987 sqlite3 **ppDb, /* OUT: Returned database handle */ 2988 unsigned int flags, /* Operational flags */ 2989 const char *zVfs /* Name of the VFS to use */ 2990 ){ 2991 sqlite3 *db; /* Store allocated handle here */ 2992 int rc; /* Return code */ 2993 int isThreadsafe; /* True for threadsafe connections */ 2994 char *zOpen = 0; /* Filename argument to pass to BtreeOpen() */ 2995 char *zErrMsg = 0; /* Error message from sqlite3ParseUri() */ 2996 2997 #ifdef SQLITE_ENABLE_API_ARMOR 2998 if( ppDb==0 ) return SQLITE_MISUSE_BKPT; 2999 #endif 3000 *ppDb = 0; 3001 #ifndef SQLITE_OMIT_AUTOINIT 3002 rc = sqlite3_initialize(); 3003 if( rc ) return rc; 3004 #endif 3005 3006 if( sqlite3GlobalConfig.bCoreMutex==0 ){ 3007 isThreadsafe = 0; 3008 }else if( flags & SQLITE_OPEN_NOMUTEX ){ 3009 isThreadsafe = 0; 3010 }else if( flags & SQLITE_OPEN_FULLMUTEX ){ 3011 isThreadsafe = 1; 3012 }else{ 3013 isThreadsafe = sqlite3GlobalConfig.bFullMutex; 3014 } 3015 3016 if( flags & SQLITE_OPEN_PRIVATECACHE ){ 3017 flags &= ~SQLITE_OPEN_SHAREDCACHE; 3018 }else if( sqlite3GlobalConfig.sharedCacheEnabled ){ 3019 flags |= SQLITE_OPEN_SHAREDCACHE; 3020 } 3021 3022 /* Remove harmful bits from the flags parameter 3023 ** 3024 ** The SQLITE_OPEN_NOMUTEX and SQLITE_OPEN_FULLMUTEX flags were 3025 ** dealt with in the previous code block. Besides these, the only 3026 ** valid input flags for sqlite3_open_v2() are SQLITE_OPEN_READONLY, 3027 ** SQLITE_OPEN_READWRITE, SQLITE_OPEN_CREATE, SQLITE_OPEN_SHAREDCACHE, 3028 ** SQLITE_OPEN_PRIVATECACHE, and some reserved bits. Silently mask 3029 ** off all other flags. 3030 */ 3031 flags &= ~( SQLITE_OPEN_DELETEONCLOSE | 3032 SQLITE_OPEN_EXCLUSIVE | 3033 SQLITE_OPEN_MAIN_DB | 3034 SQLITE_OPEN_TEMP_DB | 3035 SQLITE_OPEN_TRANSIENT_DB | 3036 SQLITE_OPEN_MAIN_JOURNAL | 3037 SQLITE_OPEN_TEMP_JOURNAL | 3038 SQLITE_OPEN_SUBJOURNAL | 3039 SQLITE_OPEN_MASTER_JOURNAL | 3040 SQLITE_OPEN_NOMUTEX | 3041 SQLITE_OPEN_FULLMUTEX | 3042 SQLITE_OPEN_WAL 3043 ); 3044 3045 /* Allocate the sqlite data structure */ 3046 db = sqlite3MallocZero( sizeof(sqlite3) ); 3047 if( db==0 ) goto opendb_out; 3048 if( isThreadsafe 3049 #ifdef SQLITE_ENABLE_MULTITHREADED_CHECKS 3050 || sqlite3GlobalConfig.bCoreMutex 3051 #endif 3052 ){ 3053 db->mutex = sqlite3MutexAlloc(SQLITE_MUTEX_RECURSIVE); 3054 if( db->mutex==0 ){ 3055 sqlite3_free(db); 3056 db = 0; 3057 goto opendb_out; 3058 } 3059 if( isThreadsafe==0 ){ 3060 sqlite3MutexWarnOnContention(db->mutex); 3061 } 3062 } 3063 sqlite3_mutex_enter(db->mutex); 3064 db->errMask = 0xff; 3065 db->nDb = 2; 3066 db->magic = SQLITE_MAGIC_BUSY; 3067 db->aDb = db->aDbStatic; 3068 db->lookaside.bDisable = 1; 3069 db->lookaside.sz = 0; 3070 3071 assert( sizeof(db->aLimit)==sizeof(aHardLimit) ); 3072 memcpy(db->aLimit, aHardLimit, sizeof(db->aLimit)); 3073 db->aLimit[SQLITE_LIMIT_WORKER_THREADS] = SQLITE_DEFAULT_WORKER_THREADS; 3074 db->autoCommit = 1; 3075 db->nextAutovac = -1; 3076 db->szMmap = sqlite3GlobalConfig.szMmap; 3077 db->nextPagesize = 0; 3078 db->nMaxSorterMmap = 0x7FFFFFFF; 3079 db->flags |= SQLITE_ShortColNames 3080 | SQLITE_EnableTrigger 3081 | SQLITE_EnableView 3082 | SQLITE_CacheSpill 3083 3084 /* The SQLITE_DQS compile-time option determines the default settings 3085 ** for SQLITE_DBCONFIG_DQS_DDL and SQLITE_DBCONFIG_DQS_DML. 3086 ** 3087 ** SQLITE_DQS SQLITE_DBCONFIG_DQS_DDL SQLITE_DBCONFIG_DQS_DML 3088 ** ---------- ----------------------- ----------------------- 3089 ** undefined on on 3090 ** 3 on on 3091 ** 2 on off 3092 ** 1 off on 3093 ** 0 off off 3094 ** 3095 ** Legacy behavior is 3 (double-quoted string literals are allowed anywhere) 3096 ** and so that is the default. But developers are encouranged to use 3097 ** -DSQLITE_DQS=0 (best) or -DSQLITE_DQS=1 (second choice) if possible. 3098 */ 3099 #if !defined(SQLITE_DQS) 3100 # define SQLITE_DQS 3 3101 #endif 3102 #if (SQLITE_DQS&1)==1 3103 | SQLITE_DqsDML 3104 #endif 3105 #if (SQLITE_DQS&2)==2 3106 | SQLITE_DqsDDL 3107 #endif 3108 3109 #if !defined(SQLITE_DEFAULT_AUTOMATIC_INDEX) || SQLITE_DEFAULT_AUTOMATIC_INDEX 3110 | SQLITE_AutoIndex 3111 #endif 3112 #if SQLITE_DEFAULT_CKPTFULLFSYNC 3113 | SQLITE_CkptFullFSync 3114 #endif 3115 #if SQLITE_DEFAULT_FILE_FORMAT<4 3116 | SQLITE_LegacyFileFmt 3117 #endif 3118 #ifdef SQLITE_ENABLE_LOAD_EXTENSION 3119 | SQLITE_LoadExtension 3120 #endif 3121 #if SQLITE_DEFAULT_RECURSIVE_TRIGGERS 3122 | SQLITE_RecTriggers 3123 #endif 3124 #if defined(SQLITE_DEFAULT_FOREIGN_KEYS) && SQLITE_DEFAULT_FOREIGN_KEYS 3125 | SQLITE_ForeignKeys 3126 #endif 3127 #if defined(SQLITE_REVERSE_UNORDERED_SELECTS) 3128 | SQLITE_ReverseOrder 3129 #endif 3130 #if defined(SQLITE_ENABLE_OVERSIZE_CELL_CHECK) 3131 | SQLITE_CellSizeCk 3132 #endif 3133 #if defined(SQLITE_ENABLE_FTS3_TOKENIZER) 3134 | SQLITE_Fts3Tokenizer 3135 #endif 3136 #if defined(SQLITE_ENABLE_QPSG) 3137 | SQLITE_EnableQPSG 3138 #endif 3139 #if defined(SQLITE_DEFAULT_DEFENSIVE) 3140 | SQLITE_Defensive 3141 #endif 3142 ; 3143 sqlite3HashInit(&db->aCollSeq); 3144 #ifndef SQLITE_OMIT_VIRTUALTABLE 3145 sqlite3HashInit(&db->aModule); 3146 #endif 3147 3148 /* Add the default collation sequence BINARY. BINARY works for both UTF-8 3149 ** and UTF-16, so add a version for each to avoid any unnecessary 3150 ** conversions. The only error that can occur here is a malloc() failure. 3151 ** 3152 ** EVIDENCE-OF: R-52786-44878 SQLite defines three built-in collating 3153 ** functions: 3154 */ 3155 createCollation(db, sqlite3StrBINARY, SQLITE_UTF8, 0, binCollFunc, 0); 3156 createCollation(db, sqlite3StrBINARY, SQLITE_UTF16BE, 0, binCollFunc, 0); 3157 createCollation(db, sqlite3StrBINARY, SQLITE_UTF16LE, 0, binCollFunc, 0); 3158 createCollation(db, "NOCASE", SQLITE_UTF8, 0, nocaseCollatingFunc, 0); 3159 createCollation(db, "RTRIM", SQLITE_UTF8, 0, rtrimCollFunc, 0); 3160 if( db->mallocFailed ){ 3161 goto opendb_out; 3162 } 3163 /* EVIDENCE-OF: R-08308-17224 The default collating function for all 3164 ** strings is BINARY. 3165 */ 3166 db->pDfltColl = sqlite3FindCollSeq(db, SQLITE_UTF8, sqlite3StrBINARY, 0); 3167 assert( db->pDfltColl!=0 ); 3168 3169 /* Parse the filename/URI argument 3170 ** 3171 ** Only allow sensible combinations of bits in the flags argument. 3172 ** Throw an error if any non-sense combination is used. If we 3173 ** do not block illegal combinations here, it could trigger 3174 ** assert() statements in deeper layers. Sensible combinations 3175 ** are: 3176 ** 3177 ** 1: SQLITE_OPEN_READONLY 3178 ** 2: SQLITE_OPEN_READWRITE 3179 ** 6: SQLITE_OPEN_READWRITE | SQLITE_OPEN_CREATE 3180 */ 3181 db->openFlags = flags; 3182 assert( SQLITE_OPEN_READONLY == 0x01 ); 3183 assert( SQLITE_OPEN_READWRITE == 0x02 ); 3184 assert( SQLITE_OPEN_CREATE == 0x04 ); 3185 testcase( (1<<(flags&7))==0x02 ); /* READONLY */ 3186 testcase( (1<<(flags&7))==0x04 ); /* READWRITE */ 3187 testcase( (1<<(flags&7))==0x40 ); /* READWRITE | CREATE */ 3188 if( ((1<<(flags&7)) & 0x46)==0 ){ 3189 rc = SQLITE_MISUSE_BKPT; /* IMP: R-65497-44594 */ 3190 }else{ 3191 rc = sqlite3ParseUri(zVfs, zFilename, &flags, &db->pVfs, &zOpen, &zErrMsg); 3192 } 3193 if( rc!=SQLITE_OK ){ 3194 if( rc==SQLITE_NOMEM ) sqlite3OomFault(db); 3195 sqlite3ErrorWithMsg(db, rc, zErrMsg ? "%s" : 0, zErrMsg); 3196 sqlite3_free(zErrMsg); 3197 goto opendb_out; 3198 } 3199 3200 /* Open the backend database driver */ 3201 rc = sqlite3BtreeOpen(db->pVfs, zOpen, db, &db->aDb[0].pBt, 0, 3202 flags | SQLITE_OPEN_MAIN_DB); 3203 if( rc!=SQLITE_OK ){ 3204 if( rc==SQLITE_IOERR_NOMEM ){ 3205 rc = SQLITE_NOMEM_BKPT; 3206 } 3207 sqlite3Error(db, rc); 3208 goto opendb_out; 3209 } 3210 sqlite3BtreeEnter(db->aDb[0].pBt); 3211 db->aDb[0].pSchema = sqlite3SchemaGet(db, db->aDb[0].pBt); 3212 if( !db->mallocFailed ) ENC(db) = SCHEMA_ENC(db); 3213 sqlite3BtreeLeave(db->aDb[0].pBt); 3214 db->aDb[1].pSchema = sqlite3SchemaGet(db, 0); 3215 3216 /* The default safety_level for the main database is FULL; for the temp 3217 ** database it is OFF. This matches the pager layer defaults. 3218 */ 3219 db->aDb[0].zDbSName = "main"; 3220 db->aDb[0].safety_level = SQLITE_DEFAULT_SYNCHRONOUS+1; 3221 db->aDb[1].zDbSName = "temp"; 3222 db->aDb[1].safety_level = PAGER_SYNCHRONOUS_OFF; 3223 3224 db->magic = SQLITE_MAGIC_OPEN; 3225 if( db->mallocFailed ){ 3226 goto opendb_out; 3227 } 3228 3229 /* Register all built-in functions, but do not attempt to read the 3230 ** database schema yet. This is delayed until the first time the database 3231 ** is accessed. 3232 */ 3233 sqlite3Error(db, SQLITE_OK); 3234 sqlite3RegisterPerConnectionBuiltinFunctions(db); 3235 rc = sqlite3_errcode(db); 3236 3237 #ifdef SQLITE_ENABLE_FTS5 3238 /* Register any built-in FTS5 module before loading the automatic 3239 ** extensions. This allows automatic extensions to register FTS5 3240 ** tokenizers and auxiliary functions. */ 3241 if( !db->mallocFailed && rc==SQLITE_OK ){ 3242 rc = sqlite3Fts5Init(db); 3243 } 3244 #endif 3245 3246 /* Load automatic extensions - extensions that have been registered 3247 ** using the sqlite3_automatic_extension() API. 3248 */ 3249 if( rc==SQLITE_OK ){ 3250 sqlite3AutoLoadExtensions(db); 3251 rc = sqlite3_errcode(db); 3252 if( rc!=SQLITE_OK ){ 3253 goto opendb_out; 3254 } 3255 } 3256 3257 #ifdef SQLITE_ENABLE_FTS1 3258 if( !db->mallocFailed ){ 3259 extern int sqlite3Fts1Init(sqlite3*); 3260 rc = sqlite3Fts1Init(db); 3261 } 3262 #endif 3263 3264 #ifdef SQLITE_ENABLE_FTS2 3265 if( !db->mallocFailed && rc==SQLITE_OK ){ 3266 extern int sqlite3Fts2Init(sqlite3*); 3267 rc = sqlite3Fts2Init(db); 3268 } 3269 #endif 3270 3271 #ifdef SQLITE_ENABLE_FTS3 /* automatically defined by SQLITE_ENABLE_FTS4 */ 3272 if( !db->mallocFailed && rc==SQLITE_OK ){ 3273 rc = sqlite3Fts3Init(db); 3274 } 3275 #endif 3276 3277 #if defined(SQLITE_ENABLE_ICU) || defined(SQLITE_ENABLE_ICU_COLLATIONS) 3278 if( !db->mallocFailed && rc==SQLITE_OK ){ 3279 rc = sqlite3IcuInit(db); 3280 } 3281 #endif 3282 3283 #ifdef SQLITE_ENABLE_RTREE 3284 if( !db->mallocFailed && rc==SQLITE_OK){ 3285 rc = sqlite3RtreeInit(db); 3286 } 3287 #endif 3288 3289 #ifdef SQLITE_ENABLE_DBPAGE_VTAB 3290 if( !db->mallocFailed && rc==SQLITE_OK){ 3291 rc = sqlite3DbpageRegister(db); 3292 } 3293 #endif 3294 3295 #ifdef SQLITE_ENABLE_DBSTAT_VTAB 3296 if( !db->mallocFailed && rc==SQLITE_OK){ 3297 rc = sqlite3DbstatRegister(db); 3298 } 3299 #endif 3300 3301 #ifdef SQLITE_ENABLE_JSON1 3302 if( !db->mallocFailed && rc==SQLITE_OK){ 3303 rc = sqlite3Json1Init(db); 3304 } 3305 #endif 3306 3307 #ifdef SQLITE_ENABLE_STMTVTAB 3308 if( !db->mallocFailed && rc==SQLITE_OK){ 3309 rc = sqlite3StmtVtabInit(db); 3310 } 3311 #endif 3312 3313 /* -DSQLITE_DEFAULT_LOCKING_MODE=1 makes EXCLUSIVE the default locking 3314 ** mode. -DSQLITE_DEFAULT_LOCKING_MODE=0 make NORMAL the default locking 3315 ** mode. Doing nothing at all also makes NORMAL the default. 3316 */ 3317 #ifdef SQLITE_DEFAULT_LOCKING_MODE 3318 db->dfltLockMode = SQLITE_DEFAULT_LOCKING_MODE; 3319 sqlite3PagerLockingMode(sqlite3BtreePager(db->aDb[0].pBt), 3320 SQLITE_DEFAULT_LOCKING_MODE); 3321 #endif 3322 3323 if( rc ) sqlite3Error(db, rc); 3324 3325 /* Enable the lookaside-malloc subsystem */ 3326 setupLookaside(db, 0, sqlite3GlobalConfig.szLookaside, 3327 sqlite3GlobalConfig.nLookaside); 3328 3329 sqlite3_wal_autocheckpoint(db, SQLITE_DEFAULT_WAL_AUTOCHECKPOINT); 3330 3331 opendb_out: 3332 if( db ){ 3333 assert( db->mutex!=0 || isThreadsafe==0 3334 || sqlite3GlobalConfig.bFullMutex==0 ); 3335 sqlite3_mutex_leave(db->mutex); 3336 } 3337 rc = sqlite3_errcode(db); 3338 assert( db!=0 || rc==SQLITE_NOMEM ); 3339 if( rc==SQLITE_NOMEM ){ 3340 sqlite3_close(db); 3341 db = 0; 3342 }else if( rc!=SQLITE_OK ){ 3343 db->magic = SQLITE_MAGIC_SICK; 3344 } 3345 *ppDb = db; 3346 #ifdef SQLITE_ENABLE_SQLLOG 3347 if( sqlite3GlobalConfig.xSqllog ){ 3348 /* Opening a db handle. Fourth parameter is passed 0. */ 3349 void *pArg = sqlite3GlobalConfig.pSqllogArg; 3350 sqlite3GlobalConfig.xSqllog(pArg, db, zFilename, 0); 3351 } 3352 #endif 3353 #if defined(SQLITE_HAS_CODEC) 3354 if( rc==SQLITE_OK ) sqlite3CodecQueryParameters(db, 0, zOpen); 3355 #endif 3356 sqlite3_free(zOpen); 3357 return rc & 0xff; 3358 } 3359 3360 3361 /* 3362 ** Open a new database handle. 3363 */ 3364 int sqlite3_open( 3365 const char *zFilename, 3366 sqlite3 **ppDb 3367 ){ 3368 return openDatabase(zFilename, ppDb, 3369 SQLITE_OPEN_READWRITE | SQLITE_OPEN_CREATE, 0); 3370 } 3371 int sqlite3_open_v2( 3372 const char *filename, /* Database filename (UTF-8) */ 3373 sqlite3 **ppDb, /* OUT: SQLite db handle */ 3374 int flags, /* Flags */ 3375 const char *zVfs /* Name of VFS module to use */ 3376 ){ 3377 return openDatabase(filename, ppDb, (unsigned int)flags, zVfs); 3378 } 3379 3380 #ifndef SQLITE_OMIT_UTF16 3381 /* 3382 ** Open a new database handle. 3383 */ 3384 int sqlite3_open16( 3385 const void *zFilename, 3386 sqlite3 **ppDb 3387 ){ 3388 char const *zFilename8; /* zFilename encoded in UTF-8 instead of UTF-16 */ 3389 sqlite3_value *pVal; 3390 int rc; 3391 3392 #ifdef SQLITE_ENABLE_API_ARMOR 3393 if( ppDb==0 ) return SQLITE_MISUSE_BKPT; 3394 #endif 3395 *ppDb = 0; 3396 #ifndef SQLITE_OMIT_AUTOINIT 3397 rc = sqlite3_initialize(); 3398 if( rc ) return rc; 3399 #endif 3400 if( zFilename==0 ) zFilename = "\000\000"; 3401 pVal = sqlite3ValueNew(0); 3402 sqlite3ValueSetStr(pVal, -1, zFilename, SQLITE_UTF16NATIVE, SQLITE_STATIC); 3403 zFilename8 = sqlite3ValueText(pVal, SQLITE_UTF8); 3404 if( zFilename8 ){ 3405 rc = openDatabase(zFilename8, ppDb, 3406 SQLITE_OPEN_READWRITE | SQLITE_OPEN_CREATE, 0); 3407 assert( *ppDb || rc==SQLITE_NOMEM ); 3408 if( rc==SQLITE_OK && !DbHasProperty(*ppDb, 0, DB_SchemaLoaded) ){ 3409 SCHEMA_ENC(*ppDb) = ENC(*ppDb) = SQLITE_UTF16NATIVE; 3410 } 3411 }else{ 3412 rc = SQLITE_NOMEM_BKPT; 3413 } 3414 sqlite3ValueFree(pVal); 3415 3416 return rc & 0xff; 3417 } 3418 #endif /* SQLITE_OMIT_UTF16 */ 3419 3420 /* 3421 ** Register a new collation sequence with the database handle db. 3422 */ 3423 int sqlite3_create_collation( 3424 sqlite3* db, 3425 const char *zName, 3426 int enc, 3427 void* pCtx, 3428 int(*xCompare)(void*,int,const void*,int,const void*) 3429 ){ 3430 return sqlite3_create_collation_v2(db, zName, enc, pCtx, xCompare, 0); 3431 } 3432 3433 /* 3434 ** Register a new collation sequence with the database handle db. 3435 */ 3436 int sqlite3_create_collation_v2( 3437 sqlite3* db, 3438 const char *zName, 3439 int enc, 3440 void* pCtx, 3441 int(*xCompare)(void*,int,const void*,int,const void*), 3442 void(*xDel)(void*) 3443 ){ 3444 int rc; 3445 3446 #ifdef SQLITE_ENABLE_API_ARMOR 3447 if( !sqlite3SafetyCheckOk(db) || zName==0 ) return SQLITE_MISUSE_BKPT; 3448 #endif 3449 sqlite3_mutex_enter(db->mutex); 3450 assert( !db->mallocFailed ); 3451 rc = createCollation(db, zName, (u8)enc, pCtx, xCompare, xDel); 3452 rc = sqlite3ApiExit(db, rc); 3453 sqlite3_mutex_leave(db->mutex); 3454 return rc; 3455 } 3456 3457 #ifndef SQLITE_OMIT_UTF16 3458 /* 3459 ** Register a new collation sequence with the database handle db. 3460 */ 3461 int sqlite3_create_collation16( 3462 sqlite3* db, 3463 const void *zName, 3464 int enc, 3465 void* pCtx, 3466 int(*xCompare)(void*,int,const void*,int,const void*) 3467 ){ 3468 int rc = SQLITE_OK; 3469 char *zName8; 3470 3471 #ifdef SQLITE_ENABLE_API_ARMOR 3472 if( !sqlite3SafetyCheckOk(db) || zName==0 ) return SQLITE_MISUSE_BKPT; 3473 #endif 3474 sqlite3_mutex_enter(db->mutex); 3475 assert( !db->mallocFailed ); 3476 zName8 = sqlite3Utf16to8(db, zName, -1, SQLITE_UTF16NATIVE); 3477 if( zName8 ){ 3478 rc = createCollation(db, zName8, (u8)enc, pCtx, xCompare, 0); 3479 sqlite3DbFree(db, zName8); 3480 } 3481 rc = sqlite3ApiExit(db, rc); 3482 sqlite3_mutex_leave(db->mutex); 3483 return rc; 3484 } 3485 #endif /* SQLITE_OMIT_UTF16 */ 3486 3487 /* 3488 ** Register a collation sequence factory callback with the database handle 3489 ** db. Replace any previously installed collation sequence factory. 3490 */ 3491 int sqlite3_collation_needed( 3492 sqlite3 *db, 3493 void *pCollNeededArg, 3494 void(*xCollNeeded)(void*,sqlite3*,int eTextRep,const char*) 3495 ){ 3496 #ifdef SQLITE_ENABLE_API_ARMOR 3497 if( !sqlite3SafetyCheckOk(db) ) return SQLITE_MISUSE_BKPT; 3498 #endif 3499 sqlite3_mutex_enter(db->mutex); 3500 db->xCollNeeded = xCollNeeded; 3501 db->xCollNeeded16 = 0; 3502 db->pCollNeededArg = pCollNeededArg; 3503 sqlite3_mutex_leave(db->mutex); 3504 return SQLITE_OK; 3505 } 3506 3507 #ifndef SQLITE_OMIT_UTF16 3508 /* 3509 ** Register a collation sequence factory callback with the database handle 3510 ** db. Replace any previously installed collation sequence factory. 3511 */ 3512 int sqlite3_collation_needed16( 3513 sqlite3 *db, 3514 void *pCollNeededArg, 3515 void(*xCollNeeded16)(void*,sqlite3*,int eTextRep,const void*) 3516 ){ 3517 #ifdef SQLITE_ENABLE_API_ARMOR 3518 if( !sqlite3SafetyCheckOk(db) ) return SQLITE_MISUSE_BKPT; 3519 #endif 3520 sqlite3_mutex_enter(db->mutex); 3521 db->xCollNeeded = 0; 3522 db->xCollNeeded16 = xCollNeeded16; 3523 db->pCollNeededArg = pCollNeededArg; 3524 sqlite3_mutex_leave(db->mutex); 3525 return SQLITE_OK; 3526 } 3527 #endif /* SQLITE_OMIT_UTF16 */ 3528 3529 #ifndef SQLITE_OMIT_DEPRECATED 3530 /* 3531 ** This function is now an anachronism. It used to be used to recover from a 3532 ** malloc() failure, but SQLite now does this automatically. 3533 */ 3534 int sqlite3_global_recover(void){ 3535 return SQLITE_OK; 3536 } 3537 #endif 3538 3539 /* 3540 ** Test to see whether or not the database connection is in autocommit 3541 ** mode. Return TRUE if it is and FALSE if not. Autocommit mode is on 3542 ** by default. Autocommit is disabled by a BEGIN statement and reenabled 3543 ** by the next COMMIT or ROLLBACK. 3544 */ 3545 int sqlite3_get_autocommit(sqlite3 *db){ 3546 #ifdef SQLITE_ENABLE_API_ARMOR 3547 if( !sqlite3SafetyCheckOk(db) ){ 3548 (void)SQLITE_MISUSE_BKPT; 3549 return 0; 3550 } 3551 #endif 3552 return db->autoCommit; 3553 } 3554 3555 /* 3556 ** The following routines are substitutes for constants SQLITE_CORRUPT, 3557 ** SQLITE_MISUSE, SQLITE_CANTOPEN, SQLITE_NOMEM and possibly other error 3558 ** constants. They serve two purposes: 3559 ** 3560 ** 1. Serve as a convenient place to set a breakpoint in a debugger 3561 ** to detect when version error conditions occurs. 3562 ** 3563 ** 2. Invoke sqlite3_log() to provide the source code location where 3564 ** a low-level error is first detected. 3565 */ 3566 int sqlite3ReportError(int iErr, int lineno, const char *zType){ 3567 sqlite3_log(iErr, "%s at line %d of [%.10s]", 3568 zType, lineno, 20+sqlite3_sourceid()); 3569 return iErr; 3570 } 3571 int sqlite3CorruptError(int lineno){ 3572 testcase( sqlite3GlobalConfig.xLog!=0 ); 3573 return sqlite3ReportError(SQLITE_CORRUPT, lineno, "database corruption"); 3574 } 3575 int sqlite3MisuseError(int lineno){ 3576 testcase( sqlite3GlobalConfig.xLog!=0 ); 3577 return sqlite3ReportError(SQLITE_MISUSE, lineno, "misuse"); 3578 } 3579 int sqlite3CantopenError(int lineno){ 3580 testcase( sqlite3GlobalConfig.xLog!=0 ); 3581 return sqlite3ReportError(SQLITE_CANTOPEN, lineno, "cannot open file"); 3582 } 3583 #ifdef SQLITE_DEBUG 3584 int sqlite3CorruptPgnoError(int lineno, Pgno pgno){ 3585 char zMsg[100]; 3586 sqlite3_snprintf(sizeof(zMsg), zMsg, "database corruption page %d", pgno); 3587 testcase( sqlite3GlobalConfig.xLog!=0 ); 3588 return sqlite3ReportError(SQLITE_CORRUPT, lineno, zMsg); 3589 } 3590 int sqlite3NomemError(int lineno){ 3591 testcase( sqlite3GlobalConfig.xLog!=0 ); 3592 return sqlite3ReportError(SQLITE_NOMEM, lineno, "OOM"); 3593 } 3594 int sqlite3IoerrnomemError(int lineno){ 3595 testcase( sqlite3GlobalConfig.xLog!=0 ); 3596 return sqlite3ReportError(SQLITE_IOERR_NOMEM, lineno, "I/O OOM error"); 3597 } 3598 #endif 3599 3600 #ifndef SQLITE_OMIT_DEPRECATED 3601 /* 3602 ** This is a convenience routine that makes sure that all thread-specific 3603 ** data for this thread has been deallocated. 3604 ** 3605 ** SQLite no longer uses thread-specific data so this routine is now a 3606 ** no-op. It is retained for historical compatibility. 3607 */ 3608 void sqlite3_thread_cleanup(void){ 3609 } 3610 #endif 3611 3612 /* 3613 ** Return meta information about a specific column of a database table. 3614 ** See comment in sqlite3.h (sqlite.h.in) for details. 3615 */ 3616 int sqlite3_table_column_metadata( 3617 sqlite3 *db, /* Connection handle */ 3618 const char *zDbName, /* Database name or NULL */ 3619 const char *zTableName, /* Table name */ 3620 const char *zColumnName, /* Column name */ 3621 char const **pzDataType, /* OUTPUT: Declared data type */ 3622 char const **pzCollSeq, /* OUTPUT: Collation sequence name */ 3623 int *pNotNull, /* OUTPUT: True if NOT NULL constraint exists */ 3624 int *pPrimaryKey, /* OUTPUT: True if column part of PK */ 3625 int *pAutoinc /* OUTPUT: True if column is auto-increment */ 3626 ){ 3627 int rc; 3628 char *zErrMsg = 0; 3629 Table *pTab = 0; 3630 Column *pCol = 0; 3631 int iCol = 0; 3632 char const *zDataType = 0; 3633 char const *zCollSeq = 0; 3634 int notnull = 0; 3635 int primarykey = 0; 3636 int autoinc = 0; 3637 3638 3639 #ifdef SQLITE_ENABLE_API_ARMOR 3640 if( !sqlite3SafetyCheckOk(db) || zTableName==0 ){ 3641 return SQLITE_MISUSE_BKPT; 3642 } 3643 #endif 3644 3645 /* Ensure the database schema has been loaded */ 3646 sqlite3_mutex_enter(db->mutex); 3647 sqlite3BtreeEnterAll(db); 3648 rc = sqlite3Init(db, &zErrMsg); 3649 if( SQLITE_OK!=rc ){ 3650 goto error_out; 3651 } 3652 3653 /* Locate the table in question */ 3654 pTab = sqlite3FindTable(db, zTableName, zDbName); 3655 if( !pTab || pTab->pSelect ){ 3656 pTab = 0; 3657 goto error_out; 3658 } 3659 3660 /* Find the column for which info is requested */ 3661 if( zColumnName==0 ){ 3662 /* Query for existance of table only */ 3663 }else{ 3664 for(iCol=0; iCol<pTab->nCol; iCol++){ 3665 pCol = &pTab->aCol[iCol]; 3666 if( 0==sqlite3StrICmp(pCol->zName, zColumnName) ){ 3667 break; 3668 } 3669 } 3670 if( iCol==pTab->nCol ){ 3671 if( HasRowid(pTab) && sqlite3IsRowid(zColumnName) ){ 3672 iCol = pTab->iPKey; 3673 pCol = iCol>=0 ? &pTab->aCol[iCol] : 0; 3674 }else{ 3675 pTab = 0; 3676 goto error_out; 3677 } 3678 } 3679 } 3680 3681 /* The following block stores the meta information that will be returned 3682 ** to the caller in local variables zDataType, zCollSeq, notnull, primarykey 3683 ** and autoinc. At this point there are two possibilities: 3684 ** 3685 ** 1. The specified column name was rowid", "oid" or "_rowid_" 3686 ** and there is no explicitly declared IPK column. 3687 ** 3688 ** 2. The table is not a view and the column name identified an 3689 ** explicitly declared column. Copy meta information from *pCol. 3690 */ 3691 if( pCol ){ 3692 zDataType = sqlite3ColumnType(pCol,0); 3693 zCollSeq = pCol->zColl; 3694 notnull = pCol->notNull!=0; 3695 primarykey = (pCol->colFlags & COLFLAG_PRIMKEY)!=0; 3696 autoinc = pTab->iPKey==iCol && (pTab->tabFlags & TF_Autoincrement)!=0; 3697 }else{ 3698 zDataType = "INTEGER"; 3699 primarykey = 1; 3700 } 3701 if( !zCollSeq ){ 3702 zCollSeq = sqlite3StrBINARY; 3703 } 3704 3705 error_out: 3706 sqlite3BtreeLeaveAll(db); 3707 3708 /* Whether the function call succeeded or failed, set the output parameters 3709 ** to whatever their local counterparts contain. If an error did occur, 3710 ** this has the effect of zeroing all output parameters. 3711 */ 3712 if( pzDataType ) *pzDataType = zDataType; 3713 if( pzCollSeq ) *pzCollSeq = zCollSeq; 3714 if( pNotNull ) *pNotNull = notnull; 3715 if( pPrimaryKey ) *pPrimaryKey = primarykey; 3716 if( pAutoinc ) *pAutoinc = autoinc; 3717 3718 if( SQLITE_OK==rc && !pTab ){ 3719 sqlite3DbFree(db, zErrMsg); 3720 zErrMsg = sqlite3MPrintf(db, "no such table column: %s.%s", zTableName, 3721 zColumnName); 3722 rc = SQLITE_ERROR; 3723 } 3724 sqlite3ErrorWithMsg(db, rc, (zErrMsg?"%s":0), zErrMsg); 3725 sqlite3DbFree(db, zErrMsg); 3726 rc = sqlite3ApiExit(db, rc); 3727 sqlite3_mutex_leave(db->mutex); 3728 return rc; 3729 } 3730 3731 /* 3732 ** Sleep for a little while. Return the amount of time slept. 3733 */ 3734 int sqlite3_sleep(int ms){ 3735 sqlite3_vfs *pVfs; 3736 int rc; 3737 pVfs = sqlite3_vfs_find(0); 3738 if( pVfs==0 ) return 0; 3739 3740 /* This function works in milliseconds, but the underlying OsSleep() 3741 ** API uses microseconds. Hence the 1000's. 3742 */ 3743 rc = (sqlite3OsSleep(pVfs, 1000*ms)/1000); 3744 return rc; 3745 } 3746 3747 /* 3748 ** Enable or disable the extended result codes. 3749 */ 3750 int sqlite3_extended_result_codes(sqlite3 *db, int onoff){ 3751 #ifdef SQLITE_ENABLE_API_ARMOR 3752 if( !sqlite3SafetyCheckOk(db) ) return SQLITE_MISUSE_BKPT; 3753 #endif 3754 sqlite3_mutex_enter(db->mutex); 3755 db->errMask = onoff ? 0xffffffff : 0xff; 3756 sqlite3_mutex_leave(db->mutex); 3757 return SQLITE_OK; 3758 } 3759 3760 /* 3761 ** Invoke the xFileControl method on a particular database. 3762 */ 3763 int sqlite3_file_control(sqlite3 *db, const char *zDbName, int op, void *pArg){ 3764 int rc = SQLITE_ERROR; 3765 Btree *pBtree; 3766 3767 #ifdef SQLITE_ENABLE_API_ARMOR 3768 if( !sqlite3SafetyCheckOk(db) ) return SQLITE_MISUSE_BKPT; 3769 #endif 3770 sqlite3_mutex_enter(db->mutex); 3771 pBtree = sqlite3DbNameToBtree(db, zDbName); 3772 if( pBtree ){ 3773 Pager *pPager; 3774 sqlite3_file *fd; 3775 sqlite3BtreeEnter(pBtree); 3776 pPager = sqlite3BtreePager(pBtree); 3777 assert( pPager!=0 ); 3778 fd = sqlite3PagerFile(pPager); 3779 assert( fd!=0 ); 3780 if( op==SQLITE_FCNTL_FILE_POINTER ){ 3781 *(sqlite3_file**)pArg = fd; 3782 rc = SQLITE_OK; 3783 }else if( op==SQLITE_FCNTL_VFS_POINTER ){ 3784 *(sqlite3_vfs**)pArg = sqlite3PagerVfs(pPager); 3785 rc = SQLITE_OK; 3786 }else if( op==SQLITE_FCNTL_JOURNAL_POINTER ){ 3787 *(sqlite3_file**)pArg = sqlite3PagerJrnlFile(pPager); 3788 rc = SQLITE_OK; 3789 }else if( op==SQLITE_FCNTL_DATA_VERSION ){ 3790 *(unsigned int*)pArg = sqlite3PagerDataVersion(pPager); 3791 rc = SQLITE_OK; 3792 }else{ 3793 rc = sqlite3OsFileControl(fd, op, pArg); 3794 } 3795 sqlite3BtreeLeave(pBtree); 3796 } 3797 sqlite3_mutex_leave(db->mutex); 3798 return rc; 3799 } 3800 3801 /* 3802 ** Interface to the testing logic. 3803 */ 3804 int sqlite3_test_control(int op, ...){ 3805 int rc = 0; 3806 #ifdef SQLITE_UNTESTABLE 3807 UNUSED_PARAMETER(op); 3808 #else 3809 va_list ap; 3810 va_start(ap, op); 3811 switch( op ){ 3812 3813 /* 3814 ** Save the current state of the PRNG. 3815 */ 3816 case SQLITE_TESTCTRL_PRNG_SAVE: { 3817 sqlite3PrngSaveState(); 3818 break; 3819 } 3820 3821 /* 3822 ** Restore the state of the PRNG to the last state saved using 3823 ** PRNG_SAVE. If PRNG_SAVE has never before been called, then 3824 ** this verb acts like PRNG_RESET. 3825 */ 3826 case SQLITE_TESTCTRL_PRNG_RESTORE: { 3827 sqlite3PrngRestoreState(); 3828 break; 3829 } 3830 3831 /* sqlite3_test_control(SQLITE_TESTCTRL_PRNG_SEED, int x, sqlite3 *db); 3832 ** 3833 ** Control the seed for the pseudo-random number generator (PRNG) that 3834 ** is built into SQLite. Cases: 3835 ** 3836 ** x!=0 && db!=0 Seed the PRNG to the current value of the 3837 ** schema cookie in the main database for db, or 3838 ** x if the schema cookie is zero. This case 3839 ** is convenient to use with database fuzzers 3840 ** as it allows the fuzzer some control over the 3841 ** the PRNG seed. 3842 ** 3843 ** x!=0 && db==0 Seed the PRNG to the value of x. 3844 ** 3845 ** x==0 && db==0 Revert to default behavior of using the 3846 ** xRandomness method on the primary VFS. 3847 ** 3848 ** This test-control also resets the PRNG so that the new seed will 3849 ** be used for the next call to sqlite3_randomness(). 3850 */ 3851 case SQLITE_TESTCTRL_PRNG_SEED: { 3852 int x = va_arg(ap, int); 3853 int y; 3854 sqlite3 *db = va_arg(ap, sqlite3*); 3855 assert( db==0 || db->aDb[0].pSchema!=0 ); 3856 if( db && (y = db->aDb[0].pSchema->schema_cookie)!=0 ){ x = y; } 3857 sqlite3Config.iPrngSeed = x; 3858 sqlite3_randomness(0,0); 3859 break; 3860 } 3861 3862 /* 3863 ** sqlite3_test_control(BITVEC_TEST, size, program) 3864 ** 3865 ** Run a test against a Bitvec object of size. The program argument 3866 ** is an array of integers that defines the test. Return -1 on a 3867 ** memory allocation error, 0 on success, or non-zero for an error. 3868 ** See the sqlite3BitvecBuiltinTest() for additional information. 3869 */ 3870 case SQLITE_TESTCTRL_BITVEC_TEST: { 3871 int sz = va_arg(ap, int); 3872 int *aProg = va_arg(ap, int*); 3873 rc = sqlite3BitvecBuiltinTest(sz, aProg); 3874 break; 3875 } 3876 3877 /* 3878 ** sqlite3_test_control(FAULT_INSTALL, xCallback) 3879 ** 3880 ** Arrange to invoke xCallback() whenever sqlite3FaultSim() is called, 3881 ** if xCallback is not NULL. 3882 ** 3883 ** As a test of the fault simulator mechanism itself, sqlite3FaultSim(0) 3884 ** is called immediately after installing the new callback and the return 3885 ** value from sqlite3FaultSim(0) becomes the return from 3886 ** sqlite3_test_control(). 3887 */ 3888 case SQLITE_TESTCTRL_FAULT_INSTALL: { 3889 /* MSVC is picky about pulling func ptrs from va lists. 3890 ** http://support.microsoft.com/kb/47961 3891 ** sqlite3GlobalConfig.xTestCallback = va_arg(ap, int(*)(int)); 3892 */ 3893 typedef int(*TESTCALLBACKFUNC_t)(int); 3894 sqlite3GlobalConfig.xTestCallback = va_arg(ap, TESTCALLBACKFUNC_t); 3895 rc = sqlite3FaultSim(0); 3896 break; 3897 } 3898 3899 /* 3900 ** sqlite3_test_control(BENIGN_MALLOC_HOOKS, xBegin, xEnd) 3901 ** 3902 ** Register hooks to call to indicate which malloc() failures 3903 ** are benign. 3904 */ 3905 case SQLITE_TESTCTRL_BENIGN_MALLOC_HOOKS: { 3906 typedef void (*void_function)(void); 3907 void_function xBenignBegin; 3908 void_function xBenignEnd; 3909 xBenignBegin = va_arg(ap, void_function); 3910 xBenignEnd = va_arg(ap, void_function); 3911 sqlite3BenignMallocHooks(xBenignBegin, xBenignEnd); 3912 break; 3913 } 3914 3915 /* 3916 ** sqlite3_test_control(SQLITE_TESTCTRL_PENDING_BYTE, unsigned int X) 3917 ** 3918 ** Set the PENDING byte to the value in the argument, if X>0. 3919 ** Make no changes if X==0. Return the value of the pending byte 3920 ** as it existing before this routine was called. 3921 ** 3922 ** IMPORTANT: Changing the PENDING byte from 0x40000000 results in 3923 ** an incompatible database file format. Changing the PENDING byte 3924 ** while any database connection is open results in undefined and 3925 ** deleterious behavior. 3926 */ 3927 case SQLITE_TESTCTRL_PENDING_BYTE: { 3928 rc = PENDING_BYTE; 3929 #ifndef SQLITE_OMIT_WSD 3930 { 3931 unsigned int newVal = va_arg(ap, unsigned int); 3932 if( newVal ) sqlite3PendingByte = newVal; 3933 } 3934 #endif 3935 break; 3936 } 3937 3938 /* 3939 ** sqlite3_test_control(SQLITE_TESTCTRL_ASSERT, int X) 3940 ** 3941 ** This action provides a run-time test to see whether or not 3942 ** assert() was enabled at compile-time. If X is true and assert() 3943 ** is enabled, then the return value is true. If X is true and 3944 ** assert() is disabled, then the return value is zero. If X is 3945 ** false and assert() is enabled, then the assertion fires and the 3946 ** process aborts. If X is false and assert() is disabled, then the 3947 ** return value is zero. 3948 */ 3949 case SQLITE_TESTCTRL_ASSERT: { 3950 volatile int x = 0; 3951 assert( /*side-effects-ok*/ (x = va_arg(ap,int))!=0 ); 3952 rc = x; 3953 break; 3954 } 3955 3956 3957 /* 3958 ** sqlite3_test_control(SQLITE_TESTCTRL_ALWAYS, int X) 3959 ** 3960 ** This action provides a run-time test to see how the ALWAYS and 3961 ** NEVER macros were defined at compile-time. 3962 ** 3963 ** The return value is ALWAYS(X) if X is true, or 0 if X is false. 3964 ** 3965 ** The recommended test is X==2. If the return value is 2, that means 3966 ** ALWAYS() and NEVER() are both no-op pass-through macros, which is the 3967 ** default setting. If the return value is 1, then ALWAYS() is either 3968 ** hard-coded to true or else it asserts if its argument is false. 3969 ** The first behavior (hard-coded to true) is the case if 3970 ** SQLITE_TESTCTRL_ASSERT shows that assert() is disabled and the second 3971 ** behavior (assert if the argument to ALWAYS() is false) is the case if 3972 ** SQLITE_TESTCTRL_ASSERT shows that assert() is enabled. 3973 ** 3974 ** The run-time test procedure might look something like this: 3975 ** 3976 ** if( sqlite3_test_control(SQLITE_TESTCTRL_ALWAYS, 2)==2 ){ 3977 ** // ALWAYS() and NEVER() are no-op pass-through macros 3978 ** }else if( sqlite3_test_control(SQLITE_TESTCTRL_ASSERT, 1) ){ 3979 ** // ALWAYS(x) asserts that x is true. NEVER(x) asserts x is false. 3980 ** }else{ 3981 ** // ALWAYS(x) is a constant 1. NEVER(x) is a constant 0. 3982 ** } 3983 */ 3984 case SQLITE_TESTCTRL_ALWAYS: { 3985 int x = va_arg(ap,int); 3986 rc = x ? ALWAYS(x) : 0; 3987 break; 3988 } 3989 3990 /* 3991 ** sqlite3_test_control(SQLITE_TESTCTRL_BYTEORDER); 3992 ** 3993 ** The integer returned reveals the byte-order of the computer on which 3994 ** SQLite is running: 3995 ** 3996 ** 1 big-endian, determined at run-time 3997 ** 10 little-endian, determined at run-time 3998 ** 432101 big-endian, determined at compile-time 3999 ** 123410 little-endian, determined at compile-time 4000 */ 4001 case SQLITE_TESTCTRL_BYTEORDER: { 4002 rc = SQLITE_BYTEORDER*100 + SQLITE_LITTLEENDIAN*10 + SQLITE_BIGENDIAN; 4003 break; 4004 } 4005 4006 /* sqlite3_test_control(SQLITE_TESTCTRL_RESERVE, sqlite3 *db, int N) 4007 ** 4008 ** Set the nReserve size to N for the main database on the database 4009 ** connection db. 4010 */ 4011 case SQLITE_TESTCTRL_RESERVE: { 4012 sqlite3 *db = va_arg(ap, sqlite3*); 4013 int x = va_arg(ap,int); 4014 sqlite3_mutex_enter(db->mutex); 4015 sqlite3BtreeSetPageSize(db->aDb[0].pBt, 0, x, 0); 4016 sqlite3_mutex_leave(db->mutex); 4017 break; 4018 } 4019 4020 /* sqlite3_test_control(SQLITE_TESTCTRL_OPTIMIZATIONS, sqlite3 *db, int N) 4021 ** 4022 ** Enable or disable various optimizations for testing purposes. The 4023 ** argument N is a bitmask of optimizations to be disabled. For normal 4024 ** operation N should be 0. The idea is that a test program (like the 4025 ** SQL Logic Test or SLT test module) can run the same SQL multiple times 4026 ** with various optimizations disabled to verify that the same answer 4027 ** is obtained in every case. 4028 */ 4029 case SQLITE_TESTCTRL_OPTIMIZATIONS: { 4030 sqlite3 *db = va_arg(ap, sqlite3*); 4031 db->dbOptFlags = (u16)(va_arg(ap, int) & 0xffff); 4032 break; 4033 } 4034 4035 /* sqlite3_test_control(SQLITE_TESTCTRL_LOCALTIME_FAULT, int onoff); 4036 ** 4037 ** If parameter onoff is non-zero, subsequent calls to localtime() 4038 ** and its variants fail. If onoff is zero, undo this setting. 4039 */ 4040 case SQLITE_TESTCTRL_LOCALTIME_FAULT: { 4041 sqlite3GlobalConfig.bLocaltimeFault = va_arg(ap, int); 4042 break; 4043 } 4044 4045 /* sqlite3_test_control(SQLITE_TESTCTRL_INTERNAL_FUNCS, int onoff); 4046 ** 4047 ** If parameter onoff is non-zero, internal-use-only SQL functions 4048 ** are visible to ordinary SQL. This is useful for testing but is 4049 ** unsafe because invalid parameters to those internal-use-only functions 4050 ** can result in crashes or segfaults. 4051 */ 4052 case SQLITE_TESTCTRL_INTERNAL_FUNCTIONS: { 4053 sqlite3GlobalConfig.bInternalFunctions = va_arg(ap, int); 4054 break; 4055 } 4056 4057 /* sqlite3_test_control(SQLITE_TESTCTRL_NEVER_CORRUPT, int); 4058 ** 4059 ** Set or clear a flag that indicates that the database file is always well- 4060 ** formed and never corrupt. This flag is clear by default, indicating that 4061 ** database files might have arbitrary corruption. Setting the flag during 4062 ** testing causes certain assert() statements in the code to be activated 4063 ** that demonstrat invariants on well-formed database files. 4064 */ 4065 case SQLITE_TESTCTRL_NEVER_CORRUPT: { 4066 sqlite3GlobalConfig.neverCorrupt = va_arg(ap, int); 4067 break; 4068 } 4069 4070 /* sqlite3_test_control(SQLITE_TESTCTRL_EXTRA_SCHEMA_CHECKS, int); 4071 ** 4072 ** Set or clear a flag that causes SQLite to verify that type, name, 4073 ** and tbl_name fields of the sqlite_master table. This is normally 4074 ** on, but it is sometimes useful to turn it off for testing. 4075 */ 4076 case SQLITE_TESTCTRL_EXTRA_SCHEMA_CHECKS: { 4077 sqlite3GlobalConfig.bExtraSchemaChecks = va_arg(ap, int); 4078 break; 4079 } 4080 4081 /* Set the threshold at which OP_Once counters reset back to zero. 4082 ** By default this is 0x7ffffffe (over 2 billion), but that value is 4083 ** too big to test in a reasonable amount of time, so this control is 4084 ** provided to set a small and easily reachable reset value. 4085 */ 4086 case SQLITE_TESTCTRL_ONCE_RESET_THRESHOLD: { 4087 sqlite3GlobalConfig.iOnceResetThreshold = va_arg(ap, int); 4088 break; 4089 } 4090 4091 /* sqlite3_test_control(SQLITE_TESTCTRL_VDBE_COVERAGE, xCallback, ptr); 4092 ** 4093 ** Set the VDBE coverage callback function to xCallback with context 4094 ** pointer ptr. 4095 */ 4096 case SQLITE_TESTCTRL_VDBE_COVERAGE: { 4097 #ifdef SQLITE_VDBE_COVERAGE 4098 typedef void (*branch_callback)(void*,unsigned int, 4099 unsigned char,unsigned char); 4100 sqlite3GlobalConfig.xVdbeBranch = va_arg(ap,branch_callback); 4101 sqlite3GlobalConfig.pVdbeBranchArg = va_arg(ap,void*); 4102 #endif 4103 break; 4104 } 4105 4106 /* sqlite3_test_control(SQLITE_TESTCTRL_SORTER_MMAP, db, nMax); */ 4107 case SQLITE_TESTCTRL_SORTER_MMAP: { 4108 sqlite3 *db = va_arg(ap, sqlite3*); 4109 db->nMaxSorterMmap = va_arg(ap, int); 4110 break; 4111 } 4112 4113 /* sqlite3_test_control(SQLITE_TESTCTRL_ISINIT); 4114 ** 4115 ** Return SQLITE_OK if SQLite has been initialized and SQLITE_ERROR if 4116 ** not. 4117 */ 4118 case SQLITE_TESTCTRL_ISINIT: { 4119 if( sqlite3GlobalConfig.isInit==0 ) rc = SQLITE_ERROR; 4120 break; 4121 } 4122 4123 /* sqlite3_test_control(SQLITE_TESTCTRL_IMPOSTER, db, dbName, onOff, tnum); 4124 ** 4125 ** This test control is used to create imposter tables. "db" is a pointer 4126 ** to the database connection. dbName is the database name (ex: "main" or 4127 ** "temp") which will receive the imposter. "onOff" turns imposter mode on 4128 ** or off. "tnum" is the root page of the b-tree to which the imposter 4129 ** table should connect. 4130 ** 4131 ** Enable imposter mode only when the schema has already been parsed. Then 4132 ** run a single CREATE TABLE statement to construct the imposter table in 4133 ** the parsed schema. Then turn imposter mode back off again. 4134 ** 4135 ** If onOff==0 and tnum>0 then reset the schema for all databases, causing 4136 ** the schema to be reparsed the next time it is needed. This has the 4137 ** effect of erasing all imposter tables. 4138 */ 4139 case SQLITE_TESTCTRL_IMPOSTER: { 4140 sqlite3 *db = va_arg(ap, sqlite3*); 4141 sqlite3_mutex_enter(db->mutex); 4142 db->init.iDb = sqlite3FindDbName(db, va_arg(ap,const char*)); 4143 db->init.busy = db->init.imposterTable = va_arg(ap,int); 4144 db->init.newTnum = va_arg(ap,int); 4145 if( db->init.busy==0 && db->init.newTnum>0 ){ 4146 sqlite3ResetAllSchemasOfConnection(db); 4147 } 4148 sqlite3_mutex_leave(db->mutex); 4149 break; 4150 } 4151 4152 #if defined(YYCOVERAGE) 4153 /* sqlite3_test_control(SQLITE_TESTCTRL_PARSER_COVERAGE, FILE *out) 4154 ** 4155 ** This test control (only available when SQLite is compiled with 4156 ** -DYYCOVERAGE) writes a report onto "out" that shows all 4157 ** state/lookahead combinations in the parser state machine 4158 ** which are never exercised. If any state is missed, make the 4159 ** return code SQLITE_ERROR. 4160 */ 4161 case SQLITE_TESTCTRL_PARSER_COVERAGE: { 4162 FILE *out = va_arg(ap, FILE*); 4163 if( sqlite3ParserCoverage(out) ) rc = SQLITE_ERROR; 4164 break; 4165 } 4166 #endif /* defined(YYCOVERAGE) */ 4167 4168 /* sqlite3_test_control(SQLITE_TESTCTRL_RESULT_INTREAL, sqlite3_context*); 4169 ** 4170 ** This test-control causes the most recent sqlite3_result_int64() value 4171 ** to be interpreted as a MEM_IntReal instead of as an MEM_Int. Normally, 4172 ** MEM_IntReal values only arise during an INSERT operation of integer 4173 ** values into a REAL column, so they can be challenging to test. This 4174 ** test-control enables us to write an intreal() SQL function that can 4175 ** inject an intreal() value at arbitrary places in an SQL statement, 4176 ** for testing purposes. 4177 */ 4178 case SQLITE_TESTCTRL_RESULT_INTREAL: { 4179 sqlite3_context *pCtx = va_arg(ap, sqlite3_context*); 4180 sqlite3ResultIntReal(pCtx); 4181 break; 4182 } 4183 } 4184 va_end(ap); 4185 #endif /* SQLITE_UNTESTABLE */ 4186 return rc; 4187 } 4188 4189 /* 4190 ** This is a utility routine, useful to VFS implementations, that checks 4191 ** to see if a database file was a URI that contained a specific query 4192 ** parameter, and if so obtains the value of the query parameter. 4193 ** 4194 ** The zFilename argument is the filename pointer passed into the xOpen() 4195 ** method of a VFS implementation. The zParam argument is the name of the 4196 ** query parameter we seek. This routine returns the value of the zParam 4197 ** parameter if it exists. If the parameter does not exist, this routine 4198 ** returns a NULL pointer. 4199 */ 4200 const char *sqlite3_uri_parameter(const char *zFilename, const char *zParam){ 4201 if( zFilename==0 || zParam==0 ) return 0; 4202 zFilename += sqlite3Strlen30(zFilename) + 1; 4203 while( zFilename[0] ){ 4204 int x = strcmp(zFilename, zParam); 4205 zFilename += sqlite3Strlen30(zFilename) + 1; 4206 if( x==0 ) return zFilename; 4207 zFilename += sqlite3Strlen30(zFilename) + 1; 4208 } 4209 return 0; 4210 } 4211 4212 /* 4213 ** Return a boolean value for a query parameter. 4214 */ 4215 int sqlite3_uri_boolean(const char *zFilename, const char *zParam, int bDflt){ 4216 const char *z = sqlite3_uri_parameter(zFilename, zParam); 4217 bDflt = bDflt!=0; 4218 return z ? sqlite3GetBoolean(z, bDflt) : bDflt; 4219 } 4220 4221 /* 4222 ** Return a 64-bit integer value for a query parameter. 4223 */ 4224 sqlite3_int64 sqlite3_uri_int64( 4225 const char *zFilename, /* Filename as passed to xOpen */ 4226 const char *zParam, /* URI parameter sought */ 4227 sqlite3_int64 bDflt /* return if parameter is missing */ 4228 ){ 4229 const char *z = sqlite3_uri_parameter(zFilename, zParam); 4230 sqlite3_int64 v; 4231 if( z && sqlite3DecOrHexToI64(z, &v)==0 ){ 4232 bDflt = v; 4233 } 4234 return bDflt; 4235 } 4236 4237 /* 4238 ** Return the Btree pointer identified by zDbName. Return NULL if not found. 4239 */ 4240 Btree *sqlite3DbNameToBtree(sqlite3 *db, const char *zDbName){ 4241 int iDb = zDbName ? sqlite3FindDbName(db, zDbName) : 0; 4242 return iDb<0 ? 0 : db->aDb[iDb].pBt; 4243 } 4244 4245 /* 4246 ** Return the filename of the database associated with a database 4247 ** connection. 4248 */ 4249 const char *sqlite3_db_filename(sqlite3 *db, const char *zDbName){ 4250 Btree *pBt; 4251 #ifdef SQLITE_ENABLE_API_ARMOR 4252 if( !sqlite3SafetyCheckOk(db) ){ 4253 (void)SQLITE_MISUSE_BKPT; 4254 return 0; 4255 } 4256 #endif 4257 pBt = sqlite3DbNameToBtree(db, zDbName); 4258 return pBt ? sqlite3BtreeGetFilename(pBt) : 0; 4259 } 4260 4261 /* 4262 ** Return 1 if database is read-only or 0 if read/write. Return -1 if 4263 ** no such database exists. 4264 */ 4265 int sqlite3_db_readonly(sqlite3 *db, const char *zDbName){ 4266 Btree *pBt; 4267 #ifdef SQLITE_ENABLE_API_ARMOR 4268 if( !sqlite3SafetyCheckOk(db) ){ 4269 (void)SQLITE_MISUSE_BKPT; 4270 return -1; 4271 } 4272 #endif 4273 pBt = sqlite3DbNameToBtree(db, zDbName); 4274 return pBt ? sqlite3BtreeIsReadonly(pBt) : -1; 4275 } 4276 4277 #ifdef SQLITE_ENABLE_SNAPSHOT 4278 /* 4279 ** Obtain a snapshot handle for the snapshot of database zDb currently 4280 ** being read by handle db. 4281 */ 4282 int sqlite3_snapshot_get( 4283 sqlite3 *db, 4284 const char *zDb, 4285 sqlite3_snapshot **ppSnapshot 4286 ){ 4287 int rc = SQLITE_ERROR; 4288 #ifndef SQLITE_OMIT_WAL 4289 4290 #ifdef SQLITE_ENABLE_API_ARMOR 4291 if( !sqlite3SafetyCheckOk(db) ){ 4292 return SQLITE_MISUSE_BKPT; 4293 } 4294 #endif 4295 sqlite3_mutex_enter(db->mutex); 4296 4297 if( db->autoCommit==0 ){ 4298 int iDb = sqlite3FindDbName(db, zDb); 4299 if( iDb==0 || iDb>1 ){ 4300 Btree *pBt = db->aDb[iDb].pBt; 4301 if( 0==sqlite3BtreeIsInTrans(pBt) ){ 4302 rc = sqlite3BtreeBeginTrans(pBt, 0, 0); 4303 if( rc==SQLITE_OK ){ 4304 rc = sqlite3PagerSnapshotGet(sqlite3BtreePager(pBt), ppSnapshot); 4305 } 4306 } 4307 } 4308 } 4309 4310 sqlite3_mutex_leave(db->mutex); 4311 #endif /* SQLITE_OMIT_WAL */ 4312 return rc; 4313 } 4314 4315 /* 4316 ** Open a read-transaction on the snapshot idendified by pSnapshot. 4317 */ 4318 int sqlite3_snapshot_open( 4319 sqlite3 *db, 4320 const char *zDb, 4321 sqlite3_snapshot *pSnapshot 4322 ){ 4323 int rc = SQLITE_ERROR; 4324 #ifndef SQLITE_OMIT_WAL 4325 4326 #ifdef SQLITE_ENABLE_API_ARMOR 4327 if( !sqlite3SafetyCheckOk(db) ){ 4328 return SQLITE_MISUSE_BKPT; 4329 } 4330 #endif 4331 sqlite3_mutex_enter(db->mutex); 4332 if( db->autoCommit==0 ){ 4333 int iDb; 4334 iDb = sqlite3FindDbName(db, zDb); 4335 if( iDb==0 || iDb>1 ){ 4336 Btree *pBt = db->aDb[iDb].pBt; 4337 if( sqlite3BtreeIsInTrans(pBt)==0 ){ 4338 Pager *pPager = sqlite3BtreePager(pBt); 4339 int bUnlock = 0; 4340 if( sqlite3BtreeIsInReadTrans(pBt) ){ 4341 if( db->nVdbeActive==0 ){ 4342 rc = sqlite3PagerSnapshotCheck(pPager, pSnapshot); 4343 if( rc==SQLITE_OK ){ 4344 bUnlock = 1; 4345 rc = sqlite3BtreeCommit(pBt); 4346 } 4347 } 4348 }else{ 4349 rc = SQLITE_OK; 4350 } 4351 if( rc==SQLITE_OK ){ 4352 rc = sqlite3PagerSnapshotOpen(pPager, pSnapshot); 4353 } 4354 if( rc==SQLITE_OK ){ 4355 rc = sqlite3BtreeBeginTrans(pBt, 0, 0); 4356 sqlite3PagerSnapshotOpen(pPager, 0); 4357 } 4358 if( bUnlock ){ 4359 sqlite3PagerSnapshotUnlock(pPager); 4360 } 4361 } 4362 } 4363 } 4364 4365 sqlite3_mutex_leave(db->mutex); 4366 #endif /* SQLITE_OMIT_WAL */ 4367 return rc; 4368 } 4369 4370 /* 4371 ** Recover as many snapshots as possible from the wal file associated with 4372 ** schema zDb of database db. 4373 */ 4374 int sqlite3_snapshot_recover(sqlite3 *db, const char *zDb){ 4375 int rc = SQLITE_ERROR; 4376 int iDb; 4377 #ifndef SQLITE_OMIT_WAL 4378 4379 #ifdef SQLITE_ENABLE_API_ARMOR 4380 if( !sqlite3SafetyCheckOk(db) ){ 4381 return SQLITE_MISUSE_BKPT; 4382 } 4383 #endif 4384 4385 sqlite3_mutex_enter(db->mutex); 4386 iDb = sqlite3FindDbName(db, zDb); 4387 if( iDb==0 || iDb>1 ){ 4388 Btree *pBt = db->aDb[iDb].pBt; 4389 if( 0==sqlite3BtreeIsInReadTrans(pBt) ){ 4390 rc = sqlite3BtreeBeginTrans(pBt, 0, 0); 4391 if( rc==SQLITE_OK ){ 4392 rc = sqlite3PagerSnapshotRecover(sqlite3BtreePager(pBt)); 4393 sqlite3BtreeCommit(pBt); 4394 } 4395 } 4396 } 4397 sqlite3_mutex_leave(db->mutex); 4398 #endif /* SQLITE_OMIT_WAL */ 4399 return rc; 4400 } 4401 4402 /* 4403 ** Free a snapshot handle obtained from sqlite3_snapshot_get(). 4404 */ 4405 void sqlite3_snapshot_free(sqlite3_snapshot *pSnapshot){ 4406 sqlite3_free(pSnapshot); 4407 } 4408 #endif /* SQLITE_ENABLE_SNAPSHOT */ 4409 4410 #ifndef SQLITE_OMIT_COMPILEOPTION_DIAGS 4411 /* 4412 ** Given the name of a compile-time option, return true if that option 4413 ** was used and false if not. 4414 ** 4415 ** The name can optionally begin with "SQLITE_" but the "SQLITE_" prefix 4416 ** is not required for a match. 4417 */ 4418 int sqlite3_compileoption_used(const char *zOptName){ 4419 int i, n; 4420 int nOpt; 4421 const char **azCompileOpt; 4422 4423 #if SQLITE_ENABLE_API_ARMOR 4424 if( zOptName==0 ){ 4425 (void)SQLITE_MISUSE_BKPT; 4426 return 0; 4427 } 4428 #endif 4429 4430 azCompileOpt = sqlite3CompileOptions(&nOpt); 4431 4432 if( sqlite3StrNICmp(zOptName, "SQLITE_", 7)==0 ) zOptName += 7; 4433 n = sqlite3Strlen30(zOptName); 4434 4435 /* Since nOpt is normally in single digits, a linear search is 4436 ** adequate. No need for a binary search. */ 4437 for(i=0; i<nOpt; i++){ 4438 if( sqlite3StrNICmp(zOptName, azCompileOpt[i], n)==0 4439 && sqlite3IsIdChar((unsigned char)azCompileOpt[i][n])==0 4440 ){ 4441 return 1; 4442 } 4443 } 4444 return 0; 4445 } 4446 4447 /* 4448 ** Return the N-th compile-time option string. If N is out of range, 4449 ** return a NULL pointer. 4450 */ 4451 const char *sqlite3_compileoption_get(int N){ 4452 int nOpt; 4453 const char **azCompileOpt; 4454 azCompileOpt = sqlite3CompileOptions(&nOpt); 4455 if( N>=0 && N<nOpt ){ 4456 return azCompileOpt[N]; 4457 } 4458 return 0; 4459 } 4460 #endif /* SQLITE_OMIT_COMPILEOPTION_DIAGS */ 4461