/*
** 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.
*/
#ifndef _SQLITE_OS_H_
#define _SQLITE_OS_H_
/*
** These #defines should enable >2GB file support on Posix if the
** underlying operating system supports it. If the OS lacks
** large file support, or if the OS is windows, these should be no-ops.
**
** Large file support can be disabled using the -DSQLITE_DISABLE_LFS switch
** on the compiler command line. This is necessary if you are compiling
** on a recent machine (ex: RedHat 7.2) but you want your code to work
** on an older machine (ex: RedHat 6.0). If you compile on RedHat 7.2
** without this option, LFS is enable. But LFS does not exist in the kernel
** in RedHat 6.0, so the code won't work. Hence, for maximum binary
** portability you should omit LFS.
*/
#ifndef SQLITE_DISABLE_LFS
# define _LARGE_FILE 1
# define _FILE_OFFSET_BITS 64
# define _LARGEFILE_SOURCE 1
#endif
/*
** Figure out if we are dealing with Unix or Windows.
*/
#ifndef OS_UNIX
# ifndef OS_WIN
# if defined(_WIN32) || defined(WIN32) || defined(__CYGWIN__) || defined(__MINGW32__) || defined(__BORLANDC__)
# define OS_WIN 1
# define OS_UNIX 0
# else
# define OS_WIN 0
# define OS_UNIX 1
# endif
# else
# define OS_UNIX 0
# endif
#endif
#ifndef OS_WIN
# define OS_WIN 0
#endif
/*
** A handle for an open file is stored in an OsFile object.
*/
#if OS_UNIX
# include <sys/types.h>
# include <sys/stat.h>
# include <fcntl.h>
# include <unistd.h>
typedef struct OsFile OsFile;
struct OsFile {
struct lockInfo *pLock; /* Information about locks on this inode */
int fd; /* The file descriptor */
int locked; /* True if this user holds the lock */
};
# define SQLITE_TEMPNAME_SIZE 200
# if defined(HAVE_USLEEP) && HAVE_USLEEP
# define SQLITE_MIN_SLEEP_MS 1
# else
# define SQLITE_MIN_SLEEP_MS 1000
# endif
#endif
#if OS_WIN
#include <windows.h>
#include <winbase.h>
typedef struct OsFile OsFile;
struct OsFile {
HANDLE h; /* Handle for accessing the file */
int locked; /* 0: unlocked, <0: write lock, >0: read lock */
};
# if defined(_MSC_VER) || defined(__BORLANDC__)
typedef __int64 off_t;
# else
typedef long long off_t;
# endif
# define SQLITE_TEMPNAME_SIZE (MAX_PATH+50)
# define SQLITE_MIN_SLEEP_MS 1
#endif
int sqliteOsDelete(const char*);
int sqliteOsFileExists(const char*);
int sqliteOsOpenReadWrite(const char*, OsFile*, int*);
int sqliteOsOpenExclusive(const char*, OsFile*, int);
int sqliteOsOpenReadOnly(const char*, OsFile*);
int sqliteOsTempFileName(char*);
int sqliteOsClose(OsFile*);
int sqliteOsRead(OsFile*, void*, int amt);
int sqliteOsWrite(OsFile*, const void*, int amt);
int sqliteOsSeek(OsFile*, off_t offset);
int sqliteOsSync(OsFile*);
int sqliteOsTruncate(OsFile*, off_t size);
int sqliteOsFileSize(OsFile*, off_t *pSize);
int sqliteOsReadLock(OsFile*);
int sqliteOsWriteLock(OsFile*);
int sqliteOsUnlock(OsFile*);
int sqliteOsRandomSeed(char*);
int sqliteOsSleep(int ms);
void sqliteOsEnterMutex(void);
void sqliteOsLeaveMutex(void);
char *sqliteOsFullPathname(const char*);
#endif /* _SQLITE_OS_H_ */