1 /* 2 ** 2005 November 29 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 ** 13 ** This file contains OS interface code that is common to all 14 ** architectures. 15 */ 16 #define _SQLITE_OS_C_ 1 17 #include "sqliteInt.h" 18 #include "os.h" 19 20 /* 21 ** The following routines are convenience wrappers around methods 22 ** of the OsFile object. This is mostly just syntactic sugar. All 23 ** of this would be completely automatic if SQLite were coded using 24 ** C++ instead of plain old C. 25 */ 26 int sqlite3OsClose(OsFile **pId){ 27 OsFile *id; 28 if( pId!=0 && (id = *pId)!=0 ){ 29 return id->pMethod->xClose(pId); 30 }else{ 31 return SQLITE_OK; 32 } 33 } 34 int sqlite3OsOpenDirectory(OsFile *id, const char *zName){ 35 return id->pMethod->xOpenDirectory(id, zName); 36 } 37 int sqlite3OsRead(OsFile *id, void *pBuf, int amt){ 38 return id->pMethod->xRead(id, pBuf, amt); 39 } 40 int sqlite3OsWrite(OsFile *id, const void *pBuf, int amt){ 41 return id->pMethod->xWrite(id, pBuf, amt); 42 } 43 int sqlite3OsSeek(OsFile *id, i64 offset){ 44 return id->pMethod->xSeek(id, offset); 45 } 46 int sqlite3OsTruncate(OsFile *id, i64 size){ 47 return id->pMethod->xTruncate(id, size); 48 } 49 int sqlite3OsSync(OsFile *id, int fullsync){ 50 return id->pMethod->xSync(id, fullsync); 51 } 52 void sqlite3OsSetFullSync(OsFile *id, int value){ 53 id->pMethod->xSetFullSync(id, value); 54 } 55 #if defined(SQLITE_TEST) || defined(SQLITE_DEBUG) 56 /* This method is currently only used while interactively debugging the 57 ** pager. More specificly, it can only be used when sqlite3DebugPrintf() is 58 ** included in the build. */ 59 int sqlite3OsFileHandle(OsFile *id){ 60 return id->pMethod->xFileHandle(id); 61 } 62 #endif 63 int sqlite3OsFileSize(OsFile *id, i64 *pSize){ 64 return id->pMethod->xFileSize(id, pSize); 65 } 66 int sqlite3OsLock(OsFile *id, int lockType){ 67 return id->pMethod->xLock(id, lockType); 68 } 69 int sqlite3OsUnlock(OsFile *id, int lockType){ 70 return id->pMethod->xUnlock(id, lockType); 71 } 72 int sqlite3OsLockState(OsFile *id){ 73 return id->pMethod->xLockState(id); 74 } 75 int sqlite3OsCheckReservedLock(OsFile *id){ 76 return id->pMethod->xCheckReservedLock(id); 77 } 78 79 #ifdef SQLITE_ENABLE_REDEF_IO 80 /* 81 ** A function to return a pointer to the virtual function table. 82 ** This routine really does not accomplish very much since the 83 ** virtual function table is a global variable and anybody who 84 ** can call this function can just as easily access the variable 85 ** for themselves. Nevertheless, we include this routine for 86 ** backwards compatibility with an earlier redefinable I/O 87 ** interface design. 88 */ 89 struct sqlite3OsVtbl *sqlite3_os_switch(void){ 90 return &sqlite3Os; 91 } 92 #endif 93