SQLite

/*
** 2004 April 6
**
** 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.
**
*************************************************************************
** $Id: btree.c,v 1.430 2007/11/05 15:30:13 danielk1977 Exp $
**
** This file implements a external (disk-based) database using BTrees.
** See the header comment on "btreeInt.h" for additional information.
** Including a description of file format and an overview of operation.
*/
#include "btreeInt.h"

          return rc;
        }
        releasePage(pFreePg);
      }while( nFin!=0 && iFreePg>nFin );
      assert( iFreePg<iLastPg );
      
      rc = sqlite3PagerWrite(pLastPg->pDbPage);
      if( rc==SQLITE_OK ){
        rc = relocatePage(pBt, pLastPg, eType, iPtrPage, iFreePg);
      }

      releasePage(pLastPg);
      if( rc!=SQLITE_OK ){
        return rc;
      }
    }
  }

  pBt->nTrunc = iLastPg - 1;
  while( pBt->nTrunc==PENDING_BYTE_PAGE(pBt)||PTRMAP_ISPAGE(pBt, pBt->nTrunc) ){
    pBt->nTrunc--;
  }

** 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 1.394 2007/11/05 15:30:13 danielk1977 Exp $
*/
#ifndef SQLITE_OMIT_DISKIO
#include "sqliteInt.h"
#include <assert.h>
#include <string.h>

/*

    if( !pPg->inJournal && (pPager->useJournal || MEMDB) ){
      if( (int)pPg->pgno <= pPager->origDbSize ){
        if( MEMDB ){
          PgHistory *pHist = PGHDR_TO_HIST(pPg, pPager);
          PAGERTRACE3("JOURNAL %d page %d\n", PAGERID(pPager), pPg->pgno);
          assert( pHist->pOrig==0 );
          pHist->pOrig = sqlite3_malloc( pPager->pageSize );
          if( !pHist->pOrig ){
            return SQLITE_NOMEM;
          }
          memcpy(pHist->pOrig, PGHDR_TO_DATA(pPg), pPager->pageSize);
        }else{
          u32 cksum;
          char *pData2;

          /* We should never write to the journal file the page that
          ** contains the database locks.  The following assert verifies
          ** that we do not. */

# This file attempts to check that the library can recover from a malloc()
# failure when sqlite3_global_recover() is invoked.
#
# (Later:) The sqlite3_global_recover() interface is now a no-op.
# Recovery from malloc() failures is automatic.  But we keep these
# tests around because you can never have too many test cases.
#
# $Id: malloc2.test,v 1.9 2007/11/05 15:30:13 danielk1977 Exp $

set testdir [file dirname $argv0]
source $testdir/tester.tcl

# Only run these tests if memory debugging is turned on.
#
ifcapable !memdebug {

        puts "Error: $res"
      }
      set rc
    } {1}

    # If $::n is greater than the number of malloc() calls required to
    # execute the SQL, then this test is finished. Break out of the loop.
    set nFail [sqlite3_memdebug_fail -1 -benigncnt nBenign]
    incr nFail [expr {-1*$nBenign}]
    if {$nFail==0} break

    # Nothing should work now, because the allocator should refuse to
    # allocate any memory.
    #
    # Update: SQLite now automatically recovers from a malloc() failure.
    # So the statement in the test below would work. 

  do_test malloc2.3.setup {
    execsql {
      CREATE TEMP TABLE ghi(a, b, c);
      BEGIN;
    }
    for {set i 0} {$i<20} {incr i} {
      execsql {
        INSERT INTO ghi VALUES(
            randstr(300,300), randstr(300,300), randstr(300,300)
        );
      }
    }
    execsql {
      COMMIT;
    }
  } {}
  do_malloc2_test 3 -sql {