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-/*
-** 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_
-
-/*
-** Figure out if we are dealing with Unix, Windows or MacOS.
-**
-** N.B. MacOS means Mac Classic (or Carbon). Treat Darwin (OS X) as Unix.
-**      The MacOS build is designed to use CodeWarrior (tested with v8)
-*/
-#if !defined(OS_UNIX) && !defined(OS_TEST)
-# ifndef OS_WIN
-#  ifndef OS_MAC
-#    if defined(__MACOS__)
-#      define OS_MAC 1
-#      define OS_WIN 0
-#      define OS_UNIX 0
-#    elif defined(_WIN32) || defined(WIN32) || defined(__CYGWIN__) || defined(__MINGW32__) || defined(__BORLANDC__)
-#      define OS_MAC 0
-#      define OS_WIN 1
-#      define OS_UNIX 0
-#    else
-#      define OS_MAC 0
-#      define OS_WIN 0
-#      define OS_UNIX 1
-#    endif
-#  else
-#    define OS_WIN 0
-#    define OS_UNIX 0
-#  endif
-# else
-#  define OS_MAC 0
-#  define OS_UNIX 0
-# endif
-#else
-# define OS_MAC 0
-# ifndef OS_WIN
-#  define OS_WIN 0
-# endif
-#endif
-
-/*
-** Invoke the appropriate operating-system specific header file.
-*/
-#if OS_TEST
-# include "os_test.h"
-#endif
-#if OS_UNIX
-# include "os_unix.h"
-#endif
-#if OS_WIN
-# include "os_win.h"
-#endif
-#if OS_MAC
-# include "os_mac.h"
-#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 -DTEMP_FILE_PREFIX=myprefix_ on the compiler command line.
-*/
-#ifndef TEMP_FILE_PREFIX
-# define TEMP_FILE_PREFIX "sqlite_"
-#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 os.h so that Unix can use the same
-** byte ranges for locking.  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.
-**
-*/
-#define PENDING_BYTE      0x40000000  /* First byte past the 1GB boundary */
-/* #define PENDING_BYTE     0x5400   // Page 20 - for testing */
-#define RESERVED_BYTE     (PENDING_BYTE+1)
-#define SHARED_FIRST      (PENDING_BYTE+2)
-#define SHARED_SIZE       510
-
-
-int sqlite3OsDelete(const char*);
-int sqlite3OsFileExists(const char*);
-int sqlite3OsOpenReadWrite(const char*, OsFile*, int*);
-int sqlite3OsOpenExclusive(const char*, OsFile*, int);
-int sqlite3OsOpenReadOnly(const char*, OsFile*);
-int sqlite3OsOpenDirectory(const char*, OsFile*);
-int sqlite3OsSyncDirectory(const char*);
-int sqlite3OsTempFileName(char*);
-int sqlite3OsClose(OsFile*);
-int sqlite3OsRead(OsFile*, void*, int amt);
-int sqlite3OsWrite(OsFile*, const void*, int amt);
-int sqlite3OsSeek(OsFile*, i64 offset);
-int sqlite3OsSync(OsFile*);
-int sqlite3OsTruncate(OsFile*, i64 size);
-int sqlite3OsFileSize(OsFile*, i64 *pSize);
-int sqlite3OsRandomSeed(char*);
-int sqlite3OsSleep(int ms);
-int sqlite3OsCurrentTime(double*);
-int sqlite3OsFileModTime(OsFile*, double*);
-void sqlite3OsEnterMutex(void);
-void sqlite3OsLeaveMutex(void);
-char *sqlite3OsFullPathname(const char*);
-int sqlite3OsLock(OsFile*, int);
-int sqlite3OsUnlock(OsFile*, int);
-int sqlite3OsCheckReservedLock(OsFile *id);
-
-#endif /* _SQLITE_OS_H_ */