diff -r 87e863f6f840 -r 3903521a36da engine/sqlite/src/os.h --- a/engine/sqlite/src/os.h Wed May 26 10:44:32 2010 +0100 +++ /dev/null Thu Jan 01 00:00:00 1970 +0000 @@ -1,359 +0,0 @@ -/* -** 2001 September 16 -** -** 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. -** -****************************************************************************** -** -** This header file (together with is companion C source-code file -** "os.c") attempt to abstract the underlying operating system so that -** the SQLite library will work on both POSIX and windows systems. -** -** This header file is #include-ed by sqliteInt.h and thus ends up -** being included by every source file. -*/ -#ifndef _SQLITE_OS_H_ -#define _SQLITE_OS_H_ - -/* -** Figure out if we are dealing with Unix, Windows, or some other -** operating system. After the following block of preprocess macros, -** all of OS_UNIX, OS_WIN, OS_OS2, and OS_OTHER will defined to either -** 1 or 0. One of the four will be 1. The other three will be 0. -*/ - -#if defined(OS_OTHER) - -# if OS_OTHER==1 -# undef OS_UNIX -# define OS_UNIX 0 -# undef OS_WIN -# define OS_WIN 0 -# undef OS_OS2 -# define OS_OS2 0 -# else -# undef OS_OTHER -# endif -#endif -#if !defined(OS_UNIX) && !defined(OS_OTHER) && !defined(OS_SYMBIAN) -# define OS_OTHER 0 -# ifndef OS_WIN -# if defined(_WIN32) || defined(WIN32) || defined(__CYGWIN__) || defined(__MINGW32__) || defined(__BORLANDC__) -# define OS_WIN 1 -# define OS_UNIX 0 -# define OS_OS2 0 -# elif defined(__EMX__) || defined(_OS2) || defined(OS2) || defined(_OS2_) || defined(__OS2__) -# define OS_WIN 0 -# define OS_UNIX 0 -# define OS_OS2 1 -# else -# define OS_WIN 0 -# define OS_UNIX 1 -# define OS_OS2 0 -# endif -# else -# define OS_UNIX 0 -# define OS_OS2 0 -# endif -#else -# ifndef OS_WIN -# define OS_WIN 0 -# endif -#endif - -#ifdef OS_SYMBIAN -# define SQLITE_TEMPNAME_SIZE (MAX_PATH+50) -#endif - - -/* -** Define the maximum size of a temporary filename -*/ -#if OS_WIN -# include -# define SQLITE_TEMPNAME_SIZE (MAX_PATH+50) -#elif OS_OS2 -# if (__GNUC__ > 3 || __GNUC__ == 3 && __GNUC_MINOR__ >= 3) && defined(OS2_HIGH_MEMORY) -# include /* has to be included before os2.h for linking to work */ -# endif -# define INCL_DOSDATETIME -# define INCL_DOSFILEMGR -# define INCL_DOSERRORS -# define INCL_DOSMISC -# define INCL_DOSPROCESS -# define INCL_DOSMODULEMGR -# define INCL_DOSSEMAPHORES -# include -# define SQLITE_TEMPNAME_SIZE (CCHMAXPATHCOMP) -#else -#ifndef SQLITE_TEMPNAME_SIZE - # define SQLITE_TEMPNAME_SIZE 200 -#endif -#endif - -/* If the SET_FULLSYNC macro is not defined above, then make it -** a no-op -*/ -#ifndef SET_FULLSYNC -# define SET_FULLSYNC(x,y) -#endif - -/* -** The default size of a disk sector -*/ -#ifndef SQLITE_DEFAULT_SECTOR_SIZE -# define SQLITE_DEFAULT_SECTOR_SIZE 512 -#endif - -/* -** Temporary files are named starting with this prefix followed by 16 random -** alphanumeric characters, and no file extension. They are stored in the -** OS's standard temporary file directory, and are deleted prior to exit. -** If sqlite is being embedded in another program, you may wish to change the -** prefix to reflect your program's name, so that if your program exits -** prematurely, old temporary files can be easily identified. This can be done -** using -DSQLITE_TEMP_FILE_PREFIX=myprefix_ on the compiler command line. -** -** 2006-10-31: The default prefix used to be "sqlite_". But then -** Mcafee started using SQLite in their anti-virus product and it -** started putting files with the "sqlite" name in the c:/temp folder. -** This annoyed many windows users. Those users would then do a -** Google search for "sqlite", find the telephone numbers of the -** developers and call to wake them up at night and complain. -** For this reason, the default name prefix is changed to be "sqlite" -** spelled backwards. So the temp files are still identified, but -** anybody smart enough to figure out the code is also likely smart -** enough to know that calling the developer will not help get rid -** of the file. -*/ -#ifndef SQLITE_TEMP_FILE_PREFIX -# define SQLITE_TEMP_FILE_PREFIX "etilqs_" -#endif - -/* -** The following values may be passed as the second argument to -** sqlite3OsLock(). The various locks exhibit the following semantics: -** -** SHARED: Any number of processes may hold a SHARED lock simultaneously. -** RESERVED: A single process may hold a RESERVED lock on a file at -** any time. Other processes may hold and obtain new SHARED locks. -** PENDING: A single process may hold a PENDING lock on a file at -** any one time. Existing SHARED locks may persist, but no new -** SHARED locks may be obtained by other processes. -** EXCLUSIVE: An EXCLUSIVE lock precludes all other locks. -** -** PENDING_LOCK may not be passed directly to sqlite3OsLock(). Instead, a -** process that requests an EXCLUSIVE lock may actually obtain a PENDING -** lock. This can be upgraded to an EXCLUSIVE lock by a subsequent call to -** sqlite3OsLock(). -*/ -#define NO_LOCK 0 -#define SHARED_LOCK 1 -#define RESERVED_LOCK 2 -#define PENDING_LOCK 3 -#define EXCLUSIVE_LOCK 4 - -/* -** File Locking Notes: (Mostly about windows but also some info for Unix) -** -** We cannot use LockFileEx() or UnlockFileEx() on Win95/98/ME because -** those functions are not available. So we use only LockFile() and -** UnlockFile(). -** -** LockFile() prevents not just writing but also reading by other processes. -** A SHARED_LOCK is obtained by locking a single randomly-chosen -** byte out of a specific range of bytes. The lock byte is obtained at -** random so two separate readers can probably access the file at the -** same time, unless they are unlucky and choose the same lock byte. -** An EXCLUSIVE_LOCK is obtained by locking all bytes in the range. -** There can only be one writer. A RESERVED_LOCK is obtained by locking -** a single byte of the file that is designated as the reserved lock byte. -** A PENDING_LOCK is obtained by locking a designated byte different from -** the RESERVED_LOCK byte. -** -** On WinNT/2K/XP systems, LockFileEx() and UnlockFileEx() are available, -** which means we can use reader/writer locks. When reader/writer locks -** are used, the lock is placed on the same range of bytes that is used -** for probabilistic locking in Win95/98/ME. Hence, the locking scheme -** will support two or more Win95 readers or two or more WinNT readers. -** But a single Win95 reader will lock out all WinNT readers and a single -** WinNT reader will lock out all other Win95 readers. -** -** The following #defines specify the range of bytes used for locking. -** SHARED_SIZE is the number of bytes available in the pool from which -** a random byte is selected for a shared lock. The pool of bytes for -** shared locks begins at SHARED_FIRST. -** -** These #defines are available in sqlite_aux.h so that adaptors for -** connecting SQLite to other operating systems can use the same byte -** ranges for locking. In particular, the same locking strategy and -** byte ranges are used for Unix. This leaves open the possiblity of having -** clients on win95, winNT, and unix all talking to the same shared file -** and all locking correctly. To do so would require that samba (or whatever -** tool is being used for file sharing) implements locks correctly between -** windows and unix. I'm guessing that isn't likely to happen, but by -** using the same locking range we are at least open to the possibility. -** -** Locking in windows is manditory. For this reason, we cannot store -** actual data in the bytes used for locking. The pager never allocates -** the pages involved in locking therefore. SHARED_SIZE is selected so -** that all locks will fit on a single page even at the minimum page size. -** PENDING_BYTE defines the beginning of the locks. By default PENDING_BYTE -** is set high so that we don't have to allocate an unused page except -** for very large databases. But one should test the page skipping logic -** by setting PENDING_BYTE low and running the entire regression suite. -** -** Changing the value of PENDING_BYTE results in a subtly incompatible -** file format. Depending on how it is changed, you might not notice -** the incompatibility right away, even running a full regression test. -** The default location of PENDING_BYTE is the first byte past the -** 1GB boundary. -** -*/ -#ifndef SQLITE_TEST -#define PENDING_BYTE 0x40000000 /* First byte past the 1GB boundary */ -#else -extern unsigned int sqlite3_pending_byte; -#define PENDING_BYTE sqlite3_pending_byte -#endif - -#define RESERVED_BYTE (PENDING_BYTE+1) -#define SHARED_FIRST (PENDING_BYTE+2) -#define SHARED_SIZE 510 - -/* -** Functions for accessing sqlite3_file methods -*/ -int sqlite3OsClose(sqlite3_file*); -int sqlite3OsRead(sqlite3_file*, void*, int amt, i64 offset); -int sqlite3OsWrite(sqlite3_file*, const void*, int amt, i64 offset); -int sqlite3OsTruncate(sqlite3_file*, i64 size); -int sqlite3OsSync(sqlite3_file*, int); -int sqlite3OsFileSize(sqlite3_file*, i64 *pSize); -int sqlite3OsLock(sqlite3_file*, int); -int sqlite3OsUnlock(sqlite3_file*, int); -int sqlite3OsCheckReservedLock(sqlite3_file *id); -int sqlite3OsFileControl(sqlite3_file*,int,void*); -int sqlite3OsSectorSize(sqlite3_file *id); -int sqlite3OsDeviceCharacteristics(sqlite3_file *id); - -/* -** Functions for accessing sqlite3_vfs methods -*/ -int sqlite3OsOpen(sqlite3_vfs *, const char *, sqlite3_file*, int, int *); -int sqlite3OsDelete(sqlite3_vfs *, const char *, int); -int sqlite3OsAccess(sqlite3_vfs *, const char *, int); -int sqlite3OsGetTempname(sqlite3_vfs *, int, char *); -int sqlite3OsFullPathname(sqlite3_vfs *, const char *, int, char *); -void *sqlite3OsDlOpen(sqlite3_vfs *, const char *); -void sqlite3OsDlError(sqlite3_vfs *, int, char *); -void *sqlite3OsDlSym(sqlite3_vfs *, void *, const char *); -void sqlite3OsDlClose(sqlite3_vfs *, void *); -int sqlite3OsRandomness(sqlite3_vfs *, int, char *); -int sqlite3OsSleep(sqlite3_vfs *, int); -int sqlite3OsCurrentTime(sqlite3_vfs *, double*); - -/* -** Convenience functions for opening and closing files using -** sqlite3_malloc() to obtain space for the file-handle structure. -*/ -int sqlite3OsOpenMalloc(sqlite3_vfs *, const char *, sqlite3_file **, int,int*); -int sqlite3OsCloseFree(sqlite3_file *); - -/* -** Each OS-specific backend defines an instance of the following -** structure for returning a pointer to its sqlite3_vfs. If OS_OTHER -** is defined (meaning that the application-defined OS interface layer -** is used) then there is no default VFS. The application must -** register one or more VFS structures using sqlite3_vfs_register() -** before attempting to use SQLite. -*/ -#if OS_UNIX || OS_WIN || OS_OS2 || OS_SYMBIAN -sqlite3_vfs *sqlite3OsDefaultVfs(void); -#else -# define sqlite3OsDefaultVfs(X) 0 -#endif - - int winDelete( - sqlite3_vfs *pVfs, /* Not used on win32 */ - const char *zFilename, /* Name of file to delete */ - int syncDir /* Not used on win32 */ -); - - int winAccess( - sqlite3_vfs *pVfs, /* Not used on win32 */ - const char *zFilename, /* Name of file to check */ - int flags /* Type of test to make on this file */ -); - - int winGetTempname(sqlite3_vfs *pVfs, int nBuf, char *zBuf); - - int winFullPathname( - sqlite3_vfs *pVfs, /* Pointer to vfs object */ - const char *zRelative, /* Possibly relative input path */ - int nFull, /* Size of output buffer in bytes */ - char *zFull /* Output buffer */ -); - - int winRandomness(sqlite3_vfs *pVfs, int nBuf, char *zBuf); - - int winClose(sqlite3_file *id); - - int winRead( - sqlite3_file *id, /* File to read from */ - void *pBuf, /* Write content into this buffer */ - int amt, /* Number of bytes to read */ - sqlite3_int64 offset /* Begin reading at this offset */ -); - - int winWrite( - sqlite3_file *id, /* File to write into */ - const void *pBuf, /* The bytes to be written */ - int amt, /* Number of bytes to write */ - sqlite3_int64 offset /* Offset into the file to begin writing at */ -); - - int winTruncate(sqlite3_file *id, sqlite3_int64 nByte); - - int winSync(sqlite3_file *id, int flags); - - int symbianFileSize(sqlite3_file *id, sqlite3_int64 *pSize); - - int winLock(sqlite3_file *id, int locktype); - - int winCheckReservedLock(sqlite3_file *id); - - int winUnlock(sqlite3_file *id, int locktype); - - int symbianFileControl(sqlite3_file *id, int op, void *pArg); - - int winSectorSize(sqlite3_file *id); - - int winDeviceCharacteristics(sqlite3_file *id); - - int winOpen( - sqlite3_vfs *pVfs, /* Not used */ - const char *zName, /* Name of the file (UTF-8) */ - sqlite3_file *id, /* Write the SQLite file handle here */ - int flags, /* Open mode flags */ - int *pOutFlags /* Status return flags */ -); - int winFullPathname( - sqlite3_vfs *pVfs, /* Pointer to vfs object */ - const char *zRelative, /* Possibly relative input path */ - int nFull, /* Size of output buffer in bytes */ - char *zFull /* Output buffer */ -); - int winSleep(sqlite3_vfs *pVfs, int microsec); - int winCurrentTime(sqlite3_vfs *pVfs, double *prNow); - - int winFileSize(sqlite3_file *id, sqlite3_int64 *pSize); - - int winFileControl(sqlite3_file *id, int op, void *pArg); - -#endif /* _SQLITE_OS_H_ */