| /* |
| ** 2010 April 7 |
| ** |
| ** The author disclaims copyright to this source code. In place of |
| ** a legal notice, here is a blessing: |
| ** |
| ** May you do good and not evil. |
| ** May you find forgiveness for yourself and forgive others. |
| ** May you share freely, never taking more than you give. |
| ** |
| ************************************************************************* |
| ** |
| ** An example of a simple VFS implementation that omits complex features |
| ** often not required or not possible on embedded platforms. Also includes |
| ** code to buffer writes to the journal file, which can be a significant |
| ** performance improvement on some embedded platforms. |
| ** |
| */ |
| |
| /* |
| ** OVERVIEW |
| ** |
| ** The code in this file implements a minimal SQLite VFS that can be |
| ** used on Linux and other posix-like operating systems. The following |
| ** system calls are used: |
| ** |
| ** File-system: access(), unlink(), getcwd() |
| ** File IO: open(), read(), write(), fsync(), close(), fstat() |
| ** Other: sleep(), usleep(), time() |
| ** |
| ** The following VFS features are omitted: |
| ** |
| ** 1. File locking. The user must ensure that there is at most one |
| ** connection to each database when using this VFS. Multiple |
| ** connections to a single shared-cache count as a single connection |
| ** for the purposes of the previous statement. |
| ** |
| ** 2. The loading of dynamic extensions (shared libraries). |
| ** |
| ** 3. Temporary files. The user must configure SQLite to use in-memory |
| ** temp files when using this VFS. The easiest way to do this is to |
| ** compile with: |
| ** |
| ** -DSQLITE_TEMP_STORE=3 |
| ** |
| ** 4. File truncation. As of version 3.6.24, SQLite may run without |
| ** a working xTruncate() call, providing the user does not configure |
| ** SQLite to use "journal_mode=truncate", or use both |
| ** "journal_mode=persist" and ATTACHed databases. |
| ** |
| ** It is assumed that the system uses UNIX-like path-names. Specifically, |
| ** that '/' characters are used to separate path components and that |
| ** a path-name is a relative path unless it begins with a '/'. And that |
| ** no UTF-8 encoded paths are greater than 512 bytes in length. |
| ** |
| ** JOURNAL WRITE-BUFFERING |
| ** |
| ** To commit a transaction to the database, SQLite first writes rollback |
| ** information into the journal file. This usually consists of 4 steps: |
| ** |
| ** 1. The rollback information is sequentially written into the journal |
| ** file, starting at the start of the file. |
| ** 2. The journal file is synced to disk. |
| ** 3. A modification is made to the first few bytes of the journal file. |
| ** 4. The journal file is synced to disk again. |
| ** |
| ** Most of the data is written in step 1 using a series of calls to the |
| ** VFS xWrite() method. The buffers passed to the xWrite() calls are of |
| ** various sizes. For example, as of version 3.6.24, when committing a |
| ** transaction that modifies 3 pages of a database file that uses 4096 |
| ** byte pages residing on a media with 512 byte sectors, SQLite makes |
| ** eleven calls to the xWrite() method to create the rollback journal, |
| ** as follows: |
| ** |
| ** Write offset | Bytes written |
| ** ---------------------------- |
| ** 0 512 |
| ** 512 4 |
| ** 516 4096 |
| ** 4612 4 |
| ** 4616 4 |
| ** 4620 4096 |
| ** 8716 4 |
| ** 8720 4 |
| ** 8724 4096 |
| ** 12820 4 |
| ** ++++++++++++SYNC+++++++++++ |
| ** 0 12 |
| ** ++++++++++++SYNC+++++++++++ |
| ** |
| ** On many operating systems, this is an efficient way to write to a file. |
| ** However, on some embedded systems that do not cache writes in OS |
| ** buffers it is much more efficient to write data in blocks that are |
| ** an integer multiple of the sector-size in size and aligned at the |
| ** start of a sector. |
| ** |
| ** To work around this, the code in this file allocates a fixed size |
| ** buffer of SQLITE_DEMOVFS_BUFFERSZ using sqlite3_malloc() whenever a |
| ** journal file is opened. It uses the buffer to coalesce sequential |
| ** writes into aligned SQLITE_DEMOVFS_BUFFERSZ blocks. When SQLite |
| ** invokes the xSync() method to sync the contents of the file to disk, |
| ** all accumulated data is written out, even if it does not constitute |
| ** a complete block. This means the actual IO to create the rollback |
| ** journal for the example transaction above is this: |
| ** |
| ** Write offset | Bytes written |
| ** ---------------------------- |
| ** 0 8192 |
| ** 8192 4632 |
| ** ++++++++++++SYNC+++++++++++ |
| ** 0 12 |
| ** ++++++++++++SYNC+++++++++++ |
| ** |
| ** Much more efficient if the underlying OS is not caching write |
| ** operations. |
| */ |
| |
| #if !defined(SQLITE_TEST) || SQLITE_OS_UNIX |
| |
| #include <sqlite3.h> |
| |
| #include <assert.h> |
| #include <string.h> |
| #include <sys/types.h> |
| #include <sys/stat.h> |
| #include <sys/file.h> |
| #include <sys/param.h> |
| #include <unistd.h> |
| #include <time.h> |
| #include <errno.h> |
| |
| /* |
| ** Size of the write buffer used by journal files in bytes. |
| */ |
| #ifndef SQLITE_DEMOVFS_BUFFERSZ |
| # define SQLITE_DEMOVFS_BUFFERSZ 8192 |
| #endif |
| |
| /* |
| ** The maximum pathname length supported by this VFS. |
| */ |
| #define MAXPATHNAME 512 |
| |
| /* |
| ** When using this VFS, the sqlite3_file* handles that SQLite uses are |
| ** actually pointers to instances of type DemoFile. |
| */ |
| typedef struct DemoFile DemoFile; |
| struct DemoFile { |
| sqlite3_file base; /* Base class. Must be first. */ |
| int fd; /* File descriptor */ |
| |
| char *aBuffer; /* Pointer to malloc'd buffer */ |
| int nBuffer; /* Valid bytes of data in zBuffer */ |
| sqlite3_int64 iBufferOfst; /* Offset in file of zBuffer[0] */ |
| }; |
| |
| /* |
| ** Write directly to the file passed as the first argument. Even if the |
| ** file has a write-buffer (DemoFile.aBuffer), ignore it. |
| */ |
| static int demoDirectWrite( |
| DemoFile *p, /* File handle */ |
| const void *zBuf, /* Buffer containing data to write */ |
| int iAmt, /* Size of data to write in bytes */ |
| sqlite_int64 iOfst /* File offset to write to */ |
| ){ |
| off_t ofst; /* Return value from lseek() */ |
| size_t nWrite; /* Return value from write() */ |
| |
| ofst = lseek(p->fd, iOfst, SEEK_SET); |
| if( ofst!=iOfst ){ |
| return SQLITE_IOERR_WRITE; |
| } |
| |
| nWrite = write(p->fd, zBuf, iAmt); |
| if( nWrite!=iAmt ){ |
| return SQLITE_IOERR_WRITE; |
| } |
| |
| return SQLITE_OK; |
| } |
| |
| /* |
| ** Flush the contents of the DemoFile.aBuffer buffer to disk. This is a |
| ** no-op if this particular file does not have a buffer (i.e. it is not |
| ** a journal file) or if the buffer is currently empty. |
| */ |
| static int demoFlushBuffer(DemoFile *p){ |
| int rc = SQLITE_OK; |
| if( p->nBuffer ){ |
| rc = demoDirectWrite(p, p->aBuffer, p->nBuffer, p->iBufferOfst); |
| p->nBuffer = 0; |
| } |
| return rc; |
| } |
| |
| /* |
| ** Close a file. |
| */ |
| static int demoClose(sqlite3_file *pFile){ |
| int rc; |
| DemoFile *p = (DemoFile*)pFile; |
| rc = demoFlushBuffer(p); |
| sqlite3_free(p->aBuffer); |
| close(p->fd); |
| return rc; |
| } |
| |
| /* |
| ** Read data from a file. |
| */ |
| static int demoRead( |
| sqlite3_file *pFile, |
| void *zBuf, |
| int iAmt, |
| sqlite_int64 iOfst |
| ){ |
| DemoFile *p = (DemoFile*)pFile; |
| off_t ofst; /* Return value from lseek() */ |
| int nRead; /* Return value from read() */ |
| int rc; /* Return code from demoFlushBuffer() */ |
| |
| /* Flush any data in the write buffer to disk in case this operation |
| ** is trying to read data the file-region currently cached in the buffer. |
| ** It would be possible to detect this case and possibly save an |
| ** unnecessary write here, but in practice SQLite will rarely read from |
| ** a journal file when there is data cached in the write-buffer. |
| */ |
| rc = demoFlushBuffer(p); |
| if( rc!=SQLITE_OK ){ |
| return rc; |
| } |
| |
| ofst = lseek(p->fd, iOfst, SEEK_SET); |
| if( ofst!=iOfst ){ |
| return SQLITE_IOERR_READ; |
| } |
| nRead = read(p->fd, zBuf, iAmt); |
| |
| if( nRead==iAmt ){ |
| return SQLITE_OK; |
| }else if( nRead>=0 ){ |
| return SQLITE_IOERR_SHORT_READ; |
| } |
| |
| return SQLITE_IOERR_READ; |
| } |
| |
| /* |
| ** Write data to a crash-file. |
| */ |
| static int demoWrite( |
| sqlite3_file *pFile, |
| const void *zBuf, |
| int iAmt, |
| sqlite_int64 iOfst |
| ){ |
| DemoFile *p = (DemoFile*)pFile; |
| |
| if( p->aBuffer ){ |
| char *z = (char *)zBuf; /* Pointer to remaining data to write */ |
| int n = iAmt; /* Number of bytes at z */ |
| sqlite3_int64 i = iOfst; /* File offset to write to */ |
| |
| while( n>0 ){ |
| int nCopy; /* Number of bytes to copy into buffer */ |
| |
| /* If the buffer is full, or if this data is not being written directly |
| ** following the data already buffered, flush the buffer. Flushing |
| ** the buffer is a no-op if it is empty. |
| */ |
| if( p->nBuffer==SQLITE_DEMOVFS_BUFFERSZ || p->iBufferOfst+p->nBuffer!=i ){ |
| int rc = demoFlushBuffer(p); |
| if( rc!=SQLITE_OK ){ |
| return rc; |
| } |
| } |
| assert( p->nBuffer==0 || p->iBufferOfst+p->nBuffer==i ); |
| p->iBufferOfst = i - p->nBuffer; |
| |
| /* Copy as much data as possible into the buffer. */ |
| nCopy = SQLITE_DEMOVFS_BUFFERSZ - p->nBuffer; |
| if( nCopy>n ){ |
| nCopy = n; |
| } |
| memcpy(&p->aBuffer[p->nBuffer], z, nCopy); |
| p->nBuffer += nCopy; |
| |
| n -= nCopy; |
| i += nCopy; |
| z += nCopy; |
| } |
| }else{ |
| return demoDirectWrite(p, zBuf, iAmt, iOfst); |
| } |
| |
| return SQLITE_OK; |
| } |
| |
| /* |
| ** Truncate a file. This is a no-op for this VFS (see header comments at |
| ** the top of the file). |
| */ |
| static int demoTruncate(sqlite3_file *pFile, sqlite_int64 size){ |
| #if 0 |
| if( ftruncate(((DemoFile *)pFile)->fd, size) ) return SQLITE_IOERR_TRUNCATE; |
| #endif |
| return SQLITE_OK; |
| } |
| |
| /* |
| ** Sync the contents of the file to the persistent media. |
| */ |
| static int demoSync(sqlite3_file *pFile, int flags){ |
| DemoFile *p = (DemoFile*)pFile; |
| int rc; |
| |
| rc = demoFlushBuffer(p); |
| if( rc!=SQLITE_OK ){ |
| return rc; |
| } |
| |
| rc = fsync(p->fd); |
| return (rc==0 ? SQLITE_OK : SQLITE_IOERR_FSYNC); |
| } |
| |
| /* |
| ** Write the size of the file in bytes to *pSize. |
| */ |
| static int demoFileSize(sqlite3_file *pFile, sqlite_int64 *pSize){ |
| DemoFile *p = (DemoFile*)pFile; |
| int rc; /* Return code from fstat() call */ |
| struct stat sStat; /* Output of fstat() call */ |
| |
| /* Flush the contents of the buffer to disk. As with the flush in the |
| ** demoRead() method, it would be possible to avoid this and save a write |
| ** here and there. But in practice this comes up so infrequently it is |
| ** not worth the trouble. |
| */ |
| rc = demoFlushBuffer(p); |
| if( rc!=SQLITE_OK ){ |
| return rc; |
| } |
| |
| rc = fstat(p->fd, &sStat); |
| if( rc!=0 ) return SQLITE_IOERR_FSTAT; |
| *pSize = sStat.st_size; |
| return SQLITE_OK; |
| } |
| |
| /* |
| ** Locking functions. The xLock() and xUnlock() methods are both no-ops. |
| ** The xCheckReservedLock() always indicates that no other process holds |
| ** a reserved lock on the database file. This ensures that if a hot-journal |
| ** file is found in the file-system it is rolled back. |
| */ |
| static int demoLock(sqlite3_file *pFile, int eLock){ |
| return SQLITE_OK; |
| } |
| static int demoUnlock(sqlite3_file *pFile, int eLock){ |
| return SQLITE_OK; |
| } |
| static int demoCheckReservedLock(sqlite3_file *pFile, int *pResOut){ |
| *pResOut = 0; |
| return SQLITE_OK; |
| } |
| |
| /* |
| ** No xFileControl() verbs are implemented by this VFS. |
| */ |
| static int demoFileControl(sqlite3_file *pFile, int op, void *pArg){ |
| return SQLITE_OK; |
| } |
| |
| /* |
| ** The xSectorSize() and xDeviceCharacteristics() methods. These two |
| ** may return special values allowing SQLite to optimize file-system |
| ** access to some extent. But it is also safe to simply return 0. |
| */ |
| static int demoSectorSize(sqlite3_file *pFile){ |
| return 0; |
| } |
| static int demoDeviceCharacteristics(sqlite3_file *pFile){ |
| return 0; |
| } |
| |
| /* |
| ** Open a file handle. |
| */ |
| static int demoOpen( |
| sqlite3_vfs *pVfs, /* VFS */ |
| const char *zName, /* File to open, or 0 for a temp file */ |
| sqlite3_file *pFile, /* Pointer to DemoFile struct to populate */ |
| int flags, /* Input SQLITE_OPEN_XXX flags */ |
| int *pOutFlags /* Output SQLITE_OPEN_XXX flags (or NULL) */ |
| ){ |
| static const sqlite3_io_methods demoio = { |
| 1, /* iVersion */ |
| demoClose, /* xClose */ |
| demoRead, /* xRead */ |
| demoWrite, /* xWrite */ |
| demoTruncate, /* xTruncate */ |
| demoSync, /* xSync */ |
| demoFileSize, /* xFileSize */ |
| demoLock, /* xLock */ |
| demoUnlock, /* xUnlock */ |
| demoCheckReservedLock, /* xCheckReservedLock */ |
| demoFileControl, /* xFileControl */ |
| demoSectorSize, /* xSectorSize */ |
| demoDeviceCharacteristics /* xDeviceCharacteristics */ |
| }; |
| |
| DemoFile *p = (DemoFile*)pFile; /* Populate this structure */ |
| int oflags = 0; /* flags to pass to open() call */ |
| char *aBuf = 0; |
| |
| if( zName==0 ){ |
| return SQLITE_IOERR; |
| } |
| |
| if( flags&SQLITE_OPEN_MAIN_JOURNAL ){ |
| aBuf = (char *)sqlite3_malloc(SQLITE_DEMOVFS_BUFFERSZ); |
| if( !aBuf ){ |
| return SQLITE_NOMEM; |
| } |
| } |
| |
| if( flags&SQLITE_OPEN_EXCLUSIVE ) oflags |= O_EXCL; |
| if( flags&SQLITE_OPEN_CREATE ) oflags |= O_CREAT; |
| if( flags&SQLITE_OPEN_READONLY ) oflags |= O_RDONLY; |
| if( flags&SQLITE_OPEN_READWRITE ) oflags |= O_RDWR; |
| |
| memset(p, 0, sizeof(DemoFile)); |
| p->fd = open(zName, oflags, 0600); |
| if( p->fd<0 ){ |
| sqlite3_free(aBuf); |
| return SQLITE_CANTOPEN; |
| } |
| p->aBuffer = aBuf; |
| |
| if( pOutFlags ){ |
| *pOutFlags = flags; |
| } |
| p->base.pMethods = &demoio; |
| return SQLITE_OK; |
| } |
| |
| /* |
| ** Delete the file identified by argument zPath. If the dirSync parameter |
| ** is non-zero, then ensure the file-system modification to delete the |
| ** file has been synced to disk before returning. |
| */ |
| static int demoDelete(sqlite3_vfs *pVfs, const char *zPath, int dirSync){ |
| int rc; /* Return code */ |
| |
| rc = unlink(zPath); |
| if( rc!=0 && errno==ENOENT ) return SQLITE_OK; |
| |
| if( rc==0 && dirSync ){ |
| int dfd; /* File descriptor open on directory */ |
| int i; /* Iterator variable */ |
| char zDir[MAXPATHNAME+1]; /* Name of directory containing file zPath */ |
| |
| /* Figure out the directory name from the path of the file deleted. */ |
| sqlite3_snprintf(MAXPATHNAME, zDir, "%s", zPath); |
| zDir[MAXPATHNAME] = '\0'; |
| for(i=strlen(zDir); i>1 && zDir[i]!='/'; i++); |
| zDir[i] = '\0'; |
| |
| /* Open a file-descriptor on the directory. Sync. Close. */ |
| dfd = open(zDir, O_RDONLY, 0); |
| if( dfd<0 ){ |
| rc = -1; |
| }else{ |
| rc = fsync(dfd); |
| close(dfd); |
| } |
| } |
| return (rc==0 ? SQLITE_OK : SQLITE_IOERR_DELETE); |
| } |
| |
| #ifndef F_OK |
| # define F_OK 0 |
| #endif |
| #ifndef R_OK |
| # define R_OK 4 |
| #endif |
| #ifndef W_OK |
| # define W_OK 2 |
| #endif |
| |
| /* |
| ** Query the file-system to see if the named file exists, is readable or |
| ** is both readable and writable. |
| */ |
| static int demoAccess( |
| sqlite3_vfs *pVfs, |
| const char *zPath, |
| int flags, |
| int *pResOut |
| ){ |
| int rc; /* access() return code */ |
| int eAccess = F_OK; /* Second argument to access() */ |
| |
| assert( flags==SQLITE_ACCESS_EXISTS /* access(zPath, F_OK) */ |
| || flags==SQLITE_ACCESS_READ /* access(zPath, R_OK) */ |
| || flags==SQLITE_ACCESS_READWRITE /* access(zPath, R_OK|W_OK) */ |
| ); |
| |
| if( flags==SQLITE_ACCESS_READWRITE ) eAccess = R_OK|W_OK; |
| if( flags==SQLITE_ACCESS_READ ) eAccess = R_OK; |
| |
| rc = access(zPath, eAccess); |
| *pResOut = (rc==0); |
| return SQLITE_OK; |
| } |
| |
| /* |
| ** Argument zPath points to a nul-terminated string containing a file path. |
| ** If zPath is an absolute path, then it is copied as is into the output |
| ** buffer. Otherwise, if it is a relative path, then the equivalent full |
| ** path is written to the output buffer. |
| ** |
| ** This function assumes that paths are UNIX style. Specifically, that: |
| ** |
| ** 1. Path components are separated by a '/'. and |
| ** 2. Full paths begin with a '/' character. |
| */ |
| static int demoFullPathname( |
| sqlite3_vfs *pVfs, /* VFS */ |
| const char *zPath, /* Input path (possibly a relative path) */ |
| int nPathOut, /* Size of output buffer in bytes */ |
| char *zPathOut /* Pointer to output buffer */ |
| ){ |
| char zDir[MAXPATHNAME+1]; |
| if( zPath[0]=='/' ){ |
| zDir[0] = '\0'; |
| }else{ |
| getcwd(zDir, sizeof(zDir)); |
| } |
| zDir[MAXPATHNAME] = '\0'; |
| |
| sqlite3_snprintf(nPathOut, zPathOut, "%s/%s", zDir, zPath); |
| zPathOut[nPathOut-1] = '\0'; |
| |
| return SQLITE_OK; |
| } |
| |
| /* |
| ** The following four VFS methods: |
| ** |
| ** xDlOpen |
| ** xDlError |
| ** xDlSym |
| ** xDlClose |
| ** |
| ** are supposed to implement the functionality needed by SQLite to load |
| ** extensions compiled as shared objects. This simple VFS does not support |
| ** this functionality, so the following functions are no-ops. |
| */ |
| static void *demoDlOpen(sqlite3_vfs *pVfs, const char *zPath){ |
| return 0; |
| } |
| static void demoDlError(sqlite3_vfs *pVfs, int nByte, char *zErrMsg){ |
| sqlite3_snprintf(nByte, zErrMsg, "Loadable extensions are not supported"); |
| zErrMsg[nByte-1] = '\0'; |
| } |
| static void (*demoDlSym(sqlite3_vfs *pVfs, void *pH, const char *z))(void){ |
| return 0; |
| } |
| static void demoDlClose(sqlite3_vfs *pVfs, void *pHandle){ |
| return; |
| } |
| |
| /* |
| ** Parameter zByte points to a buffer nByte bytes in size. Populate this |
| ** buffer with pseudo-random data. |
| */ |
| static int demoRandomness(sqlite3_vfs *pVfs, int nByte, char *zByte){ |
| return SQLITE_OK; |
| } |
| |
| /* |
| ** Sleep for at least nMicro microseconds. Return the (approximate) number |
| ** of microseconds slept for. |
| */ |
| static int demoSleep(sqlite3_vfs *pVfs, int nMicro){ |
| sleep(nMicro / 1000000); |
| usleep(nMicro % 1000000); |
| return nMicro; |
| } |
| |
| /* |
| ** Set *pTime to the current UTC time expressed as a Julian day. Return |
| ** SQLITE_OK if successful, or an error code otherwise. |
| ** |
| ** http://en.wikipedia.org/wiki/Julian_day |
| ** |
| ** This implementation is not very good. The current time is rounded to |
| ** an integer number of seconds. Also, assuming time_t is a signed 32-bit |
| ** value, it will stop working some time in the year 2038 AD (the so-called |
| ** "year 2038" problem that afflicts systems that store time this way). |
| */ |
| static int demoCurrentTime(sqlite3_vfs *pVfs, double *pTime){ |
| time_t t = time(0); |
| *pTime = t/86400.0 + 2440587.5; |
| return SQLITE_OK; |
| } |
| |
| /* |
| ** This function returns a pointer to the VFS implemented in this file. |
| ** To make the VFS available to SQLite: |
| ** |
| ** sqlite3_vfs_register(sqlite3_demovfs(), 0); |
| */ |
| sqlite3_vfs *sqlite3_demovfs(void){ |
| static sqlite3_vfs demovfs = { |
| 1, /* iVersion */ |
| sizeof(DemoFile), /* szOsFile */ |
| MAXPATHNAME, /* mxPathname */ |
| 0, /* pNext */ |
| "demo", /* zName */ |
| 0, /* pAppData */ |
| demoOpen, /* xOpen */ |
| demoDelete, /* xDelete */ |
| demoAccess, /* xAccess */ |
| demoFullPathname, /* xFullPathname */ |
| demoDlOpen, /* xDlOpen */ |
| demoDlError, /* xDlError */ |
| demoDlSym, /* xDlSym */ |
| demoDlClose, /* xDlClose */ |
| demoRandomness, /* xRandomness */ |
| demoSleep, /* xSleep */ |
| demoCurrentTime, /* xCurrentTime */ |
| }; |
| return &demovfs; |
| } |
| |
| #endif /* !defined(SQLITE_TEST) || SQLITE_OS_UNIX */ |
| |
| |
| #ifdef SQLITE_TEST |
| |
| #include <tcl.h> |
| |
| #if SQLITE_OS_UNIX |
| static int register_demovfs( |
| ClientData clientData, /* Pointer to sqlite3_enable_XXX function */ |
| Tcl_Interp *interp, /* The TCL interpreter that invoked this command */ |
| int objc, /* Number of arguments */ |
| Tcl_Obj *CONST objv[] /* Command arguments */ |
| ){ |
| sqlite3_vfs_register(sqlite3_demovfs(), 1); |
| return TCL_OK; |
| } |
| static int unregister_demovfs( |
| ClientData clientData, /* Pointer to sqlite3_enable_XXX function */ |
| Tcl_Interp *interp, /* The TCL interpreter that invoked this command */ |
| int objc, /* Number of arguments */ |
| Tcl_Obj *CONST objv[] /* Command arguments */ |
| ){ |
| sqlite3_vfs_unregister(sqlite3_demovfs()); |
| return TCL_OK; |
| } |
| |
| /* |
| ** Register commands with the TCL interpreter. |
| */ |
| int Sqlitetest_demovfs_Init(Tcl_Interp *interp){ |
| Tcl_CreateObjCommand(interp, "register_demovfs", register_demovfs, 0, 0); |
| Tcl_CreateObjCommand(interp, "unregister_demovfs", unregister_demovfs, 0, 0); |
| return TCL_OK; |
| } |
| |
| #else |
| int Sqlitetest_demovfs_Init(Tcl_Interp *interp){ return TCL_OK; } |
| #endif |
| |
| #endif /* SQLITE_TEST */ |
