** 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 1.315 2007/04/02 11:08:59 danielk1977 Exp $
*/
#ifndef SQLITE_OMIT_DISKIO
#include "sqliteInt.h"
#include "os.h"
#include "pager.h"
#include <assert.h>
#include <string.h>
................................................................................
  }
  sqlite3PagerStmtCommit(pPager);
  if( pPager->stmtOpen && !pPager->exclusiveMode ){
    sqlite3OsClose(&pPager->stfd);
    pPager->stmtOpen = 0;
  }
  if( pPager->journalOpen ){
    if( pPager->exclusiveMode ){
      rc = sqlite3OsTruncate(pPager->jfd, 0);
      sqlite3OsSeek(pPager->jfd, 0);
      pPager->journalOff = 0;
      pPager->journalStarted = 0;
    }else{
      sqlite3OsClose(&pPager->jfd);
      pPager->journalOpen = 0;
      /* If this is a temporary pager file, then the journal file should
      ** have been configured as delete-on-close. Otherwise, it should still
      ** be in the file system. This pager still holds a RESERVED or greater
      ** lock on the database file, so there is no chance another process
      ** could create or remove a journal file.
      **
      ** These asserts are not valid for asynchronous I/O such as is found
      ** in async.test
      */
      /*assert( sqlite3OsFileExists(pPager->zJournal) || pPager->tempFile );*/
      /*assert( !sqlite3OsFileExists(pPager->zJournal) || !pPager->tempFile );*/
      if( !pPager->tempFile ){
        rc = sqlite3OsDelete(pPager->zJournal);
      }
    }
    sqliteFree( pPager->aInJournal );
    pPager->aInJournal = 0;
    for(pPg=pPager->pAll; pPg; pPg=pPg->pNextAll){
      pPg->inJournal = 0;
................................................................................
    }
  }
  return rc;

failed_to_open_journal:
  sqliteFree(pPager->aInJournal);
  pPager->aInJournal = 0;
#if 0
  if( rc==SQLITE_NOMEM ){
    /* If this was a malloc() failure, then we will not be closing the pager
    ** file. So delete any journal file we may have just created. Otherwise,
    ** the system will get confused, we have a read-lock on the file and a
    ** mysterious journal has appeared in the filesystem.
    */
    /* sqlite3OsDelete(pPager->zJournal); */
  }else{
    /* If we reset the pager here, we will delete pages out from under
    ** various cursors and will ultimately segfault. */
    /* pager_reset(pPager); */
  }
#endif
  return rc;
}

/*
** Acquire a write-lock on the database.  The lock is removed when
** the any of the following happen:
**

** 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 1.316 2007/04/02 11:22:22 drh Exp $
*/
#ifndef SQLITE_OMIT_DISKIO
#include "sqliteInt.h"
#include "os.h"
#include "pager.h"
#include <assert.h>
#include <string.h>
................................................................................
  }
  sqlite3PagerStmtCommit(pPager);
  if( pPager->stmtOpen && !pPager->exclusiveMode ){
    sqlite3OsClose(&pPager->stfd);
    pPager->stmtOpen = 0;
  }
  if( pPager->journalOpen ){
    if( pPager->exclusiveMode 
          && (rc = sqlite3OsTruncate(pPager->jfd, 0))==SQLITE_OK ){;
      sqlite3OsSeek(pPager->jfd, 0);
      pPager->journalOff = 0;
      pPager->journalStarted = 0;
    }else{
      sqlite3OsClose(&pPager->jfd);
      pPager->journalOpen = 0;
      if( rc==SQLITE_OK ){











        rc = sqlite3OsDelete(pPager->zJournal);
      }
    }
    sqliteFree( pPager->aInJournal );
    pPager->aInJournal = 0;
    for(pPg=pPager->pAll; pPg; pPg=pPg->pNextAll){
      pPg->inJournal = 0;
................................................................................
    }
  }
  return rc;

failed_to_open_journal:
  sqliteFree(pPager->aInJournal);
  pPager->aInJournal = 0;














  return rc;
}

/*
** Acquire a write-lock on the database.  The lock is removed when
** the any of the following happen:
**