persistentstorage/sql/SQLite/os.c
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Fri, 22 Jan 2010 11:06:30 +0200
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permissions -rw-r--r--
Revision: 201003 Kit: 201003
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/*
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** 2005 November 29
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**
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** The author disclaims copyright to this source code.  In place of
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** a legal notice, here is a blessing:
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**
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**    May you do good and not evil.
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**    May you find forgiveness for yourself and forgive others.
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**    May you share freely, never taking more than you give.
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**
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******************************************************************************
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**
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** This file contains OS interface code that is common to all
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** architectures.
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**
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** $Id: os.c,v 1.120 2008/07/28 19:34:53 drh Exp $
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*/
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#define _SQLITE_OS_C_ 1
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#include "sqliteInt.h"
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#undef _SQLITE_OS_C_
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/*
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** The default SQLite sqlite3_vfs implementations do not allocate
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** memory (actually, os_unix.c allocates a small amount of memory
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** from within OsOpen()), but some third-party implementations may.
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** So we test the effects of a malloc() failing and the sqlite3OsXXX()
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** function returning SQLITE_IOERR_NOMEM using the DO_OS_MALLOC_TEST macro.
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**
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** The following functions are instrumented for malloc() failure 
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** testing:
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**
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**     sqlite3OsOpen()
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**     sqlite3OsRead()
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**     sqlite3OsWrite()
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**     sqlite3OsSync()
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**     sqlite3OsLock()
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**
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*/
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#if defined(SQLITE_TEST) && (SQLITE_OS_WIN==0) && 0
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  #define DO_OS_MALLOC_TEST if (1) {            \
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    void *pTstAlloc = sqlite3Malloc(10);       \
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    if (!pTstAlloc) return SQLITE_IOERR_NOMEM;  \
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    sqlite3_free(pTstAlloc);                    \
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  }
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#else
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  #define DO_OS_MALLOC_TEST
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#endif
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/*
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** The following routines are convenience wrappers around methods
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** of the sqlite3_file object.  This is mostly just syntactic sugar. All
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** of this would be completely automatic if SQLite were coded using
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** C++ instead of plain old C.
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*/
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int sqlite3OsClose(sqlite3_file *pId){
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  int rc = SQLITE_OK;
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  if( pId->pMethods ){
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    rc = pId->pMethods->xClose(pId);
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    pId->pMethods = 0;
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  }
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  return rc;
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}
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int sqlite3OsRead(sqlite3_file *id, void *pBuf, int amt, i64 offset){
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  DO_OS_MALLOC_TEST;
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  return id->pMethods->xRead(id, pBuf, amt, offset);
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}
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int sqlite3OsWrite(sqlite3_file *id, const void *pBuf, int amt, i64 offset){
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  DO_OS_MALLOC_TEST;
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  return id->pMethods->xWrite(id, pBuf, amt, offset);
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}
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int sqlite3OsTruncate(sqlite3_file *id, i64 size){
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  return id->pMethods->xTruncate(id, size);
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}
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int sqlite3OsSync(sqlite3_file *id, int flags){
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  DO_OS_MALLOC_TEST;
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  return id->pMethods->xSync(id, flags);
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}
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int sqlite3OsFileSize(sqlite3_file *id, i64 *pSize){
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  DO_OS_MALLOC_TEST;
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  return id->pMethods->xFileSize(id, pSize);
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}
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int sqlite3OsLock(sqlite3_file *id, int lockType){
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  DO_OS_MALLOC_TEST;
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  return id->pMethods->xLock(id, lockType);
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}
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int sqlite3OsUnlock(sqlite3_file *id, int lockType){
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  return id->pMethods->xUnlock(id, lockType);
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}
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int sqlite3OsCheckReservedLock(sqlite3_file *id, int *pResOut){
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  DO_OS_MALLOC_TEST;
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  return id->pMethods->xCheckReservedLock(id, pResOut);
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}
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int sqlite3OsFileControl(sqlite3_file *id, int op, void *pArg){
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  return id->pMethods->xFileControl(id, op, pArg);
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}
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int sqlite3OsSectorSize(sqlite3_file *id){
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  int (*xSectorSize)(sqlite3_file*) = id->pMethods->xSectorSize;
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  return (xSectorSize ? xSectorSize(id) : SQLITE_DEFAULT_SECTOR_SIZE);
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}
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int sqlite3OsDeviceCharacteristics(sqlite3_file *id){
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  return id->pMethods->xDeviceCharacteristics(id);
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}
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/*
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** The next group of routines are convenience wrappers around the
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** VFS methods.
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*/
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int sqlite3OsOpen(
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  sqlite3_vfs *pVfs, 
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  const char *zPath, 
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  sqlite3_file *pFile, 
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  int flags, 
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  int *pFlagsOut
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){
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  DO_OS_MALLOC_TEST;
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  return pVfs->xOpen(pVfs, zPath, pFile, flags, pFlagsOut);
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}
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int sqlite3OsDelete(sqlite3_vfs *pVfs, const char *zPath, int dirSync){
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  return pVfs->xDelete(pVfs, zPath, dirSync);
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}
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int sqlite3OsAccess(
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  sqlite3_vfs *pVfs, 
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  const char *zPath, 
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  int flags, 
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  int *pResOut
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   126
){
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  DO_OS_MALLOC_TEST;
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  return pVfs->xAccess(pVfs, zPath, flags, pResOut);
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}
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int sqlite3OsFullPathname(
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  sqlite3_vfs *pVfs, 
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  const char *zPath, 
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  int nPathOut, 
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  char *zPathOut
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){
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  return pVfs->xFullPathname(pVfs, zPath, nPathOut, zPathOut);
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}
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#ifndef SQLITE_OMIT_LOAD_EXTENSION
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void *sqlite3OsDlOpen(sqlite3_vfs *pVfs, const char *zPath){
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  return pVfs->xDlOpen(pVfs, zPath);
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}
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void sqlite3OsDlError(sqlite3_vfs *pVfs, int nByte, char *zBufOut){
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  pVfs->xDlError(pVfs, nByte, zBufOut);
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}
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void *sqlite3OsDlSym(sqlite3_vfs *pVfs, void *pHandle, const char *zSymbol){
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  return pVfs->xDlSym(pVfs, pHandle, zSymbol);
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}
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void sqlite3OsDlClose(sqlite3_vfs *pVfs, void *pHandle){
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  pVfs->xDlClose(pVfs, pHandle);
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}
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#endif /* SQLITE_OMIT_LOAD_EXTENSION */
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int sqlite3OsRandomness(sqlite3_vfs *pVfs, int nByte, char *zBufOut){
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  return pVfs->xRandomness(pVfs, nByte, zBufOut);
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}
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int sqlite3OsSleep(sqlite3_vfs *pVfs, int nMicro){
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  return pVfs->xSleep(pVfs, nMicro);
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}
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int sqlite3OsCurrentTime(sqlite3_vfs *pVfs, double *pTimeOut){
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  return pVfs->xCurrentTime(pVfs, pTimeOut);
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}
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   161
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int sqlite3OsOpenMalloc(
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  sqlite3_vfs *pVfs, 
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  const char *zFile, 
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  sqlite3_file **ppFile, 
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  int flags,
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  int *pOutFlags
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   168
){
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  int rc = SQLITE_NOMEM;
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  sqlite3_file *pFile;
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  pFile = (sqlite3_file *)sqlite3Malloc(pVfs->szOsFile);
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   172
  if( pFile ){
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    rc = sqlite3OsOpen(pVfs, zFile, pFile, flags, pOutFlags);
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   174
    if( rc!=SQLITE_OK ){
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      sqlite3_free(pFile);
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   176
    }else{
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      *ppFile = pFile;
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   178
    }
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  }
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  return rc;
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   181
}
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   182
int sqlite3OsCloseFree(sqlite3_file *pFile){
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  int rc = SQLITE_OK;
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  assert( pFile );
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  rc = sqlite3OsClose(pFile);
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  sqlite3_free(pFile);
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  return rc;
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}
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   189
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   190
/*
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** The list of all registered VFS implementations.
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   192
*/
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static sqlite3_vfs *vfsList = 0;
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   194
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   195
/*
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** Locate a VFS by name.  If no name is given, simply return the
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** first VFS on the list.
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   198
*/
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   199
sqlite3_vfs *sqlite3_vfs_find(const char *zVfs){
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  sqlite3_vfs *pVfs = 0;
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   201
#ifndef SQLITE_MUTEX_NOOP
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  sqlite3_mutex *mutex;
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   203
#endif
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   204
#ifndef SQLITE_OMIT_AUTOINIT
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  int rc = sqlite3_initialize();
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  if( rc ) return 0;
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   207
#endif
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   208
#ifndef SQLITE_MUTEX_NOOP
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  mutex = sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MASTER);
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#endif
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  sqlite3_mutex_enter(mutex);
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   212
  for(pVfs = vfsList; pVfs; pVfs=pVfs->pNext){
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   213
    if( zVfs==0 ) break;
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   214
    if( strcmp(zVfs, pVfs->zName)==0 ) break;
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   215
  }
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  sqlite3_mutex_leave(mutex);
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  return pVfs;
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   218
}
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   219
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/*
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** Unlink a VFS from the linked list
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*/
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static void vfsUnlink(sqlite3_vfs *pVfs){
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  assert( sqlite3_mutex_held(sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MASTER)) );
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  if( pVfs==0 ){
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    /* No-op */
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  }else if( vfsList==pVfs ){
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    vfsList = pVfs->pNext;
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  }else if( vfsList ){
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    sqlite3_vfs *p = vfsList;
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    while( p->pNext && p->pNext!=pVfs ){
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      p = p->pNext;
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    }
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    if( p->pNext==pVfs ){
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      p->pNext = pVfs->pNext;
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    }
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  }
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}
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/*
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** Register a VFS with the system.  It is harmless to register the same
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** VFS multiple times.  The new VFS becomes the default if makeDflt is
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** true.
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*/
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int sqlite3_vfs_register(sqlite3_vfs *pVfs, int makeDflt){
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  sqlite3_mutex *mutex = 0;
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#ifndef SQLITE_OMIT_AUTOINIT
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  int rc = sqlite3_initialize();
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  if( rc ) return rc;
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#endif
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  mutex = sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MASTER);
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  sqlite3_mutex_enter(mutex);
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  vfsUnlink(pVfs);
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  if( makeDflt || vfsList==0 ){
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    pVfs->pNext = vfsList;
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    vfsList = pVfs;
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  }else{
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    pVfs->pNext = vfsList->pNext;
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    vfsList->pNext = pVfs;
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  }
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  assert(vfsList);
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  sqlite3_mutex_leave(mutex);
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  return SQLITE_OK;
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}
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/*
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** Unregister a VFS so that it is no longer accessible.
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*/
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int sqlite3_vfs_unregister(sqlite3_vfs *pVfs){
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#ifndef SQLITE_MUTEX_NOOP
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  sqlite3_mutex *mutex = sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MASTER);
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#endif
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  sqlite3_mutex_enter(mutex);
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  vfsUnlink(pVfs);
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  sqlite3_mutex_leave(mutex);
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  return SQLITE_OK;
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}