Artifact bed702c9e3b768bc3cb1b12c90b83d099c1546be:

• File src/os.h — part of check-in [484b82d8] at 2001-10-09 04:19:47 on branch trunk — Fix the locking protocol. (CVS 280) (user: drh size: 1950)

/*
** 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_

/*
** A handle for an open file is stored in an OsFile object.
*/
#if OS_UNIX
  typedef struct OsFile OsFile;
  struct OsFile {
    struct lockInfo *pLock;  /* Information about locks on this inode */
    int fd;                  /* The file descriptor */
  };
# 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 HANDLE OsFile;
# 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 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, int offset);
int sqliteOsSync(OsFile);
int sqliteOsTruncate(OsFile, int size);
int sqliteOsFileSize(OsFile, int *pSize);
int sqliteOsLock(OsFile, int wrlock);
int sqliteOsUnlock(OsFile);
int sqliteOsRandomSeed(char*);
int sqliteOsSleep(int ms);
void sqliteOsEnterMutex();
void sqliteOsLeaveMutex();



#endif /* _SQLITE_OS_H_ */