SQLite

  sqlite3_bind_zeroblob,
  sqlite3_blob_bytes,
  sqlite3_blob_close,
  sqlite3_blob_open,
  sqlite3_blob_read,
  sqlite3_blob_write,
  sqlite3_create_collation_v2,
  sqlite3_file_control,
  sqlite3_memory_highwater,
  sqlite3_memory_used,
#ifdef SQLITE_MUTEX_NOOP
  0, 
  0, 
  0,
  0,

**
*************************************************************************
** Main file for the SQLite library.  The routines in this file
** implement the programmer interface to the library.  Routines in
** other files are for internal use by SQLite and should not be
** accessed by users of the library.
**
** $Id: main.c,v 1.401 2007/08/31 16:11:36 drh Exp $
*/
#include "sqliteInt.h"
#include <ctype.h>

/*
** The version of the library
*/

*/
int sqlite3_extended_result_codes(sqlite3 *db, int onoff){
  sqlite3_mutex_enter(db->mutex);
  db->errMask = onoff ? 0xffffffff : 0xff;
  sqlite3_mutex_leave(db->mutex);
  return SQLITE_OK;
}

/*
** Invoke the xFileControl method on a particular database.
*/
int sqlite3_file_control(sqlite3 *db, const char *zDbName, int op, void *pArg){
  int rc = SQLITE_ERROR;
  int iDb;
  sqlite3_mutex_enter(db->mutex);
  if( zDbName==0 ){
    iDb = 0;
  }else{
    for(iDb=0; iDb<db->nDb; iDb++){
      if( strcmp(db->aDb[iDb].zName, zDbName)==0 ) break;
    }
  }
  if( iDb<db->nDb ){
    Btree *pBtree = db->aDb[iDb].pBt;
    if( pBtree ){
      Pager *pPager;
      sqlite3BtreeEnter(pBtree);
      pPager = sqlite3BtreePager(pBtree);
      if( pPager ){
        sqlite3_file *fd = sqlite3PagerFile(pPager);
        if( fd ){
          rc = sqlite3OsFileControl(fd, op, pArg);
        }
      }
      sqlite3BtreeLeave(pBtree);
    }
  }
  sqlite3_mutex_leave(db->mutex);
  return rc;   
}

}
int sqlite3OsLock(sqlite3_file *id, int lockType){
  return id->pMethods->xLock(id, lockType);
}
int sqlite3OsUnlock(sqlite3_file *id, int lockType){
  return id->pMethods->xUnlock(id, lockType);
}
int sqlite3OsCheckReservedLock(sqlite3_file *id){
  return id->pMethods->xCheckReservedLock(id);
}
int sqlite3OsFileControl(sqlite3_file *id, int op, void *pArg){
  return id->pMethods->xFileControl(id,op,pArg);
}

#ifdef SQLITE_TEST
  /* The following two variables are used to override the values returned
  ** by the xSectorSize() and xDeviceCharacteristics() vfs methods for
  ** testing purposes. They are usually set by a test command implemented
  ** in test6.c.

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 sqlite3OsLockState(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 *);

  return SQLITE_OK;
}

#endif /* SQLITE_ENABLE_LOCKING_STYLE */


/*
** No xFileControl opcodes are implemented by this VFS.
*/
static int unixFileControl(sqlite3_file *id, int op, void *pArg){

  return SQLITE_ERROR;
}

/*
** Return an integer that indices the type of lock currently held
** by this handle.  (Used for testing and analysis only.)
*/
static int unixLockState(sqlite3_file *id){

  unixWrite,
  unixTruncate,
  unixSync,
  unixFileSize,
  unixLock,
  unixUnlock,
  unixCheckReservedLock,

  unixLockState,
  unixFileControl,
  unixSectorSize,
  unixDeviceCharacteristics
};

#ifdef SQLITE_ENABLE_LOCKING_STYLE
/*
** This vector defines all the methods that can operate on an sqlite3_file
** for unix with AFP style file locking.
*/
static const sqlite3_io_methods sqlite3AFPLockingUnixIoMethod = {
  1,                        /* iVersion */
  unixClose,
  unixRead,
  unixWrite,
  unixTruncate,
  unixSync,
  unixFileSize,
  afpUnixLock,
  afpUnixUnlock,
  afpUnixCheckReservedLock,

  unixLockState,
  unixFileControl,
  unixSectorSize,
  unixDeviceCharacteristics
};

/*
** This vector defines all the methods that can operate on an sqlite3_file
** for unix with flock() style file locking.
*/
static const sqlite3_io_methods sqlite3FlockLockingUnixIoMethod = {
  1,                        /* iVersion */
  flockUnixClose,
  unixRead,
  unixWrite,
  unixTruncate,
  unixSync,
  unixFileSize,
  flockUnixLock,
  flockUnixUnlock,
  flockUnixCheckReservedLock,

  unixLockState,
  unixFileControl,
  unixSectorSize,
  unixDeviceCharacteristics
};

/*
** This vector defines all the methods that can operate on an sqlite3_file
** for unix with dotlock style file locking.
*/
static const sqlite3_io_methods sqlite3DotlockLockingUnixIoMethod = {
  1,                        /* iVersion */
  dotlockUnixClose,
  unixRead,
  unixWrite,
  unixTruncate,
  unixSync,
  unixFileSize,
  dotlockUnixLock,
  dotlockUnixUnlock,
  dotlockUnixCheckReservedLock,

  unixLockState,
  unixFileControl,
  unixSectorSize,
  unixDeviceCharacteristics
};

/*
** This vector defines all the methods that can operate on an sqlite3_file
** for unix with dotlock style file locking.
*/
static const sqlite3_io_methods sqlite3NolockLockingUnixIoMethod = {
  1,                        /* iVersion */
  nolockUnixClose,
  unixRead,
  unixWrite,
  unixTruncate,
  unixSync,
  unixFileSize,
  nolockUnixLock,
  nolockUnixUnlock,
  nolockUnixCheckReservedLock,

  unixLockState,
  unixFileControl,
  unixSectorSize,
  unixDeviceCharacteristics
};

#endif /* SQLITE_ENABLE_LOCKING_STYLE */

/*

    UnlockFile(pFile->h, PENDING_BYTE, 0, 1, 0);
  }
  pFile->locktype = locktype;
  return rc;
}

/*
** No xFileControl operations are currently implemented.
*/
static int winFileControl(sqlite3_file *id){
  return SQLITE_ERROR;
}

/*
** Return an integer that indices the type of lock currently held
** by this handle.  (Used for testing and analysis only.)
*/

  winWrite,
  winTruncate,
  winSync,
  winFileSize,
  winLock,
  winUnlock,
  winCheckReservedLock,

  winLockState,
  winFileControl,
  winSectorSize,
  winDeviceCharacteristics
};

/***************************************************************************
** Here ends the I/O methods that form the sqlite3_io_methods object.
**

** The pager is used to access a database disk file.  It implements
** atomic commit and rollback through the use of a journal file that
** is separate from the database file.  The pager also implements file
** locking to prevent two processes from writing the same database
** file simultaneously, or one process from reading the database while
** another is writing.
**
** @(#) $Id: pager.c,v 1.382 2007/08/31 16:11:36 drh Exp $
*/
#ifndef SQLITE_OMIT_DISKIO
#include "sqliteInt.h"
#include <assert.h>
#include <string.h>

/*

/*
** Return the VFS structure for the pager.
*/
const sqlite3_vfs *sqlite3PagerVfs(Pager *pPager){
  return pPager->pVfs;
}

/*
** Return the file handle for the database file associated
** with the pager.  This might return NULL if the file has
** not yet been opened.
*/
sqlite3_file *sqlite3PagerFile(Pager *pPager){
  return pPager->fd;
}

/*
** Return the directory of the database file.
*/
const char *sqlite3PagerDirname(Pager *pPager){
  return pPager->zDirectory;
}

**    May you share freely, never taking more than you give.
**
*************************************************************************
** This header file defines the interface that the sqlite page cache
** subsystem.  The page cache subsystem reads and writes a file a page
** at a time and provides a journal for rollback.
**
** @(#) $Id: pager.h,v 1.65 2007/08/31 16:11:36 drh Exp $
*/

#ifndef _PAGER_H_
#define _PAGER_H_

/*
** The type used to represent a page number.  The first page in a file

int sqlite3PagerStmtRollback(Pager*);
void sqlite3PagerDontRollback(DbPage*);
void sqlite3PagerDontWrite(DbPage*);
int sqlite3PagerRefcount(Pager*);
void sqlite3PagerSetSafetyLevel(Pager*,int,int);
const char *sqlite3PagerFilename(Pager*);
const sqlite3_vfs *sqlite3PagerVfs(Pager*);
sqlite3_file *sqlite3PagerFile(Pager*);
const char *sqlite3PagerDirname(Pager*);
const char *sqlite3PagerJournalname(Pager*);
int sqlite3PagerNosync(Pager*);
int sqlite3PagerMovepage(Pager*,DbPage*,Pgno);
void *sqlite3PagerGetData(DbPage *); 
void *sqlite3PagerGetExtra(DbPage *); 
int sqlite3PagerLockingMode(Pager *, int);

** on how SQLite interfaces are suppose to operate.
**
** The name of this file under configuration management is "sqlite.h.in".
** The makefile makes some minor changes to this file (such as inserting
** the version number) and changes its name to "sqlite3.h" as
** part of the build process.
**
** @(#) $Id: sqlite.h.in,v 1.252 2007/08/31 16:11:36 drh Exp $
*/
#ifndef _SQLITE3_H_
#define _SQLITE3_H_
#include <stdarg.h>     /* Needed for the definition of va_list */

/*
** Make sure we can call this stuff from C++.

** increases the lock. xUnlock() decreases the lock.  
** The xCheckReservedLock() method looks
** to see if any database connection, either in this
** process or in some other process, is holding an RESERVED,
** PENDING, or EXCLUSIVE lock on the file.  It returns true
** if such a lock exists and false if not.
** 
** The xFileControl() method is a generic interface that allows custom
** VFS implementations to directly control an open file using the
** [sqlite3_file_control()] interface.  The second argument (the
** "op" argument) is intended to be an integer opcode.  The third
** argument is a generic pointer which is intended to be a pointer
** to a structure that may contain arguments or space in which to
** write return values.  Potential uses for xFileControl() might be
** functions to enable blocking locks with timeouts, to change the
** locking strategy (for example to use dot-file locks), to inquire

** about the status of a lock, or to break stale locks.  No standard
** xFileControl opcodes are currently defined, but this may change in 
** future releases.  Applications that define a custom xFileControl
** method should use opcodes greater than 100 to avoid conflicts
** with future official opcodes which will be less than that value.
**
** The xSectorSize() method returns the sector size of the
** device that underlies the file.  The sector size is the
** minimum write that can be performed without disturbing
** other bytes in the file.  The xDeviceCharacteristics()
** method returns a bit vector describing behaviors of the
** underlying device:

  int (*xWrite)(sqlite3_file*, const void*, int iAmt, sqlite_int64 iOfst);
  int (*xTruncate)(sqlite3_file*, sqlite_int64 size);
  int (*xSync)(sqlite3_file*, int flags);
  int (*xFileSize)(sqlite3_file*, sqlite_int64 *pSize);
  int (*xLock)(sqlite3_file*, int);
  int (*xUnlock)(sqlite3_file*, int);
  int (*xCheckReservedLock)(sqlite3_file*);

  int (*xLockState)(sqlite3_file *);
  int (*xFileControl)(sqlite3_file*, int op, void *pArg);
  int (*xSectorSize)(sqlite3_file*);
  int (*xDeviceCharacteristics)(sqlite3_file*);
  /* Additional methods may be added in future releases */
};

/*
** CAPI3REF: Mutex Handle

#define SQLITE_MUTEX_RECURSIVE        1
#define SQLITE_MUTEX_STATIC_MASTER    2
#define SQLITE_MUTEX_STATIC_MEM       3  /* sqlite3_malloc() */
#define SQLITE_MUTEX_STATIC_MEM2      4  /* sqlite3_release_memory() */
#define SQLITE_MUTEX_STATIC_PRNG      5  /* sqlite3_random() */
#define SQLITE_MUTEX_STATIC_LRU       6  /* lru page list */

/*
** CAPI3REF: Low-Level Control Of Database Files
**
** The [sqlite3_file_control()] interface makes a direct call to the
** xFileControl method for the [sqlite3_io_methods] object associated
** with a particular database identified by the second argument.  The
** name of the database is the name assigned to the database by the
** <a href="lang_attach.html">ATTACH</a> SQL command that opened the
** database.  To control the main database file, use the name "main"
** or a NULL pointer.  The third and fourth parameters to this routine
** are passed directly through to the second and third parameters of
** the xFileControl method.  The return value of the xFileControl
** method becomes the return value of this routine.
**
** If the second parameter (zDbName) does not match the name of any
** open database file, then SQLITE_ERROR is returned.  This error
** code is not remembered and will not be recalled by [sqlite3_errcode()]
** or [sqlite3_errmsg()].  The underlying xFileControl method might
** also return SQLITE_ERROR.  There is no way to distinguish between
** an incorrect zDbName and an SQLITE_ERROR return from the underlying
** xFileControl method.
*/
int sqlite3_file_control(sqlite3*, const char *zDbName, int op, void*);

/*
** Undo the hack that converts floating point types to integer for
** builds on processors without floating point support.
*/
#ifdef SQLITE_OMIT_FLOATING_POINT
# undef double
#endif

#ifdef __cplusplus
}  /* End of the 'extern "C"' block */
#endif
#endif

*************************************************************************
** This header file defines the SQLite interface for use by
** shared libraries that want to be imported as extensions into
** an SQLite instance.  Shared libraries that intend to be loaded
** as extensions by SQLite should #include this file instead of 
** sqlite3.h.
**
** @(#) $Id: sqlite3ext.h,v 1.17 2007/08/31 16:11:36 drh Exp $
*/
#ifndef _SQLITE3EXT_H_
#define _SQLITE3EXT_H_
#include "sqlite3.h"

typedef struct sqlite3_api_routines sqlite3_api_routines;

  int (*bind_zeroblob)(sqlite3_stmt*,int,int);
  int (*blob_bytes)(sqlite3_blob*);
  int (*blob_close)(sqlite3_blob*);
  int (*blob_open)(sqlite3*,const char*,const char*,const char*,sqlite3_int64,int,sqlite3_blob**);
  int (*blob_read)(sqlite3_blob*,void*,int,int);
  int (*blob_write)(sqlite3_blob*,const void*,int,int);
  int (*create_collation_v2)(sqlite3*,const char*,int,void*,int(*)(void*,int,const void*,int,const void*),void(*)(void*));
  int (*file_control)(sqlite3*,const char*,int,void*);
  sqlite3_int64 (*memory_highwater)(int);
  sqlite3_int64 (*memory_used)(void);
  sqlite3_mutex *(*mutex_alloc)(int);
  void (*mutex_enter)(sqlite3_mutex*);
  void (*mutex_free)(sqlite3_mutex*);
  void (*mutex_leave)(sqlite3_mutex*);
  int (*mutex_try)(sqlite3_mutex*);

#define sqlite3_bind_zeroblob          sqlite3_api->bind_zeroblob
#define sqlite3_blob_bytes             sqlite3_api->blob_bytes
#define sqlite3_blob_close             sqlite3_api->blob_close
#define sqlite3_blob_open              sqlite3_api->blob_open
#define sqlite3_blob_read              sqlite3_api->blob_read
#define sqlite3_blob_write             sqlite3_api->blob_write
#define sqlite3_create_collation_v2    sqlite3_api->create_collation_v2
#define sqlite3_file_control           sqlite3_api->file_control
#define sqlite3_memory_highwater       sqlite3_api->memory_highwater
#define sqlite3_memory_used            sqlite3_api->memory_used
#define sqlite3_mutex_alloc            sqlite3_api->mutex_alloc
#define sqlite3_mutex_enter            sqlite3_api->mutex_enter
#define sqlite3_mutex_free             sqlite3_api->mutex_free
#define sqlite3_mutex_leave            sqlite3_api->mutex_leave
#define sqlite3_mutex_try              sqlite3_api->mutex_try

}
static int cfCheckReservedLock(sqlite3_file *pFile){
  return sqlite3OsCheckReservedLock(((CrashFile *)pFile)->pRealFile);
}
static int cfLockState(sqlite3_file *pFile){
  return sqlite3OsLockState(((CrashFile *)pFile)->pRealFile);
}
static int cfFileControl(sqlite3_file *pFile, int op, void *pArg){
  return sqlite3OsFileControl(((CrashFile *)pFile)->pRealFile, op, pArg);
}

/*
** The xSectorSize() and xDeviceCharacteristics() functions return
** the global values configured by the [sqlite_crashparams] tcl
*  interface.
*/

  cfWrite,                      /* xWrite */
  cfTruncate,                   /* xTruncate */
  cfSync,                       /* xSync */
  cfFileSize,                   /* xFileSize */
  cfLock,                       /* xLock */
  cfUnlock,                     /* xUnlock */
  cfCheckReservedLock,          /* xCheckReservedLock */

  cfLockState,                  /* xLockState */
  cfFileControl,                /* xFileControl */
  cfSectorSize,                 /* xSectorSize */
  cfDeviceCharacteristics       /* xDeviceCharacteristics */
};

/*
** Application data for the crash VFS
*/