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