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Overview
Comment:Enable redefinable I/O if the SQLITE_ENABLE_REDEF_IO macro exists. (CVS 2883)
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SHA1:e170e15766389e978991b42a0d2ec303162aaad6
User & Date: drh 2006-01-07 16:06:07
Context
2006-01-07
18:10
Make sure there is no ephemeral data on the stack before returning from an sqlite3_step() call. Otherwise, if the statement is in READ UNCOMMITTED mode then the data might be deleted or changed out from under us. (CVS 2884) check-in: 19f71a6d user: drh tags: trunk
16:06
Enable redefinable I/O if the SQLITE_ENABLE_REDEF_IO macro exists. (CVS 2883) check-in: e170e157 user: drh tags: trunk
14:02
Fix some memory leaks caused by obscure syntax errors in SQL. (CVS 2882) check-in: 6593199a user: danielk1977 tags: trunk
Changes
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Changes to src/os.c. 

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**    May you share freely, never taking more than you give.
**
******************************************************************************
**
** This file contains OS interface code that is common to all
** architectures.
*/

#include "sqliteInt.h"
#include "os.h"

/*
** The following routines are convenience wrappers around methods
** of the OsFile object.  This is mostly just syntactic sugar.  All
** of this would be completely automatic if SQLite were coded using
................................................................................
}
int sqlite3OsLockState(OsFile *id){
  return id->pMethod->xLockState(id);
}
int sqlite3OsCheckReservedLock(OsFile *id){
  return id->pMethod->xCheckReservedLock(id);
}























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**    May you share freely, never taking more than you give.
**
******************************************************************************
**
** This file contains OS interface code that is common to all
** architectures.
*/
#define _SQLITE_OS_C_ 1
#include "sqliteInt.h"
#include "os.h"

/*
** The following routines are convenience wrappers around methods
** of the OsFile object.  This is mostly just syntactic sugar.  All
** of this would be completely automatic if SQLite were coded using
................................................................................
}
int sqlite3OsLockState(OsFile *id){
  return id->pMethod->xLockState(id);
}
int sqlite3OsCheckReservedLock(OsFile *id){
  return id->pMethod->xCheckReservedLock(id);
}

#ifdef SQLITE_ENABLE_REDEF_IO
/*
** A function to return a pointer to the virtual function table.
** This routine really does not accomplish very much since the
** virtual function table is a global variable and anybody who
** can call this function can just as easily access the variable
** for themselves.  Nevertheless, we include this routine for
** backwards compatibility with an earlier redefinable I/O
** interface design.
*/
struct sqlite3OsVtbl *sqlite3_os_switch(void){
  return &sqlite3Os;
}
#endif

Changes to src/os.h. 

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int sqlite3OsInMutex(void);
void *sqlite3OsThreadSpecificData(int);
void *sqlite3OsMalloc(int);
void *sqlite3OsRealloc(void *, int);
void sqlite3OsFree(void *);
int sqlite3OsAllocationSize(void *);












































































































































#endif /* _SQLITE_OS_H_ */








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int sqlite3OsInMutex(void);
void *sqlite3OsThreadSpecificData(int);
void *sqlite3OsMalloc(int);
void *sqlite3OsRealloc(void *, int);
void sqlite3OsFree(void *);
int sqlite3OsAllocationSize(void *);

/*
** If the SQLITE_ENABLE_REDEF_IO macro is defined, then the OS-layer
** interface routines are not called directly but are invoked using
** pointers to functions.  This allows the implementation of various
** OS-layer interface routines to be modified at run-time.  There are
** obscure but legitimate reasons for wanting to do this.  But for
** most users, a direct call to the underlying interface is preferable
** so the the redefinable I/O interface is turned off by default.
*/
#ifdef SQLITE_ENABLE_REDEF_IO

/*
** When redefinable I/O is enabled, a single global instance of the
** following structure holds pointers to the routines that SQLite 
** uses to talk with the underlying operating system.  Modify this
** structure (before using any SQLite API!) to accomodate perculiar
** operating system interfaces or behaviors.
*/
struct sqlite3OsVtbl {
  int (*xOpenReadWrite)(const char*, OsFile**, int*);
  int (*xOpenExclusive)(const char*, OsFile**, int);
  int (*xOpenReadOnly)(const char*, OsFile**);

  int (*xDelete)(const char*);
  int (*xFileExists)(const char*);
  char *(*xFullPathname)(const char*);
  int (*xIsDirWritable)(char*);
  int (*xSyncDirectory)(const char*);
  int (*xTempFileName)(char*);

  int (*xRandomSeed)(char*);
  int (*xSleep)(int ms);
  int (*xCurrentTime)(double*);

  void (*xEnterMutex)(void);
  void (*xLeaveMutex)(void);
  int (*xInMutex)(void);
  void *(*xThreadSpecificData)(int);

  void *(*xMalloc)(int);
  void *(*xRealloc)(void *, int);
  void (*xFree)(void *);
  int (*xAllocationSize)(void *);
};

/* Macro used to comment out routines that do not exists when there is
** no disk I/O 
*/
#ifdef SQLITE_OMIT_DISKIO
# define IF_DISKIO(X)  0
#else
# define IF_DISKIO(X)  X
#endif

#ifdef _SQLITE_OS_C_
  /*
  ** The os.c file implements the global virtual function table.
  */
  struct sqlite3OsVtbl sqlite3Os = {
    IF_DISKIO( sqlite3OsOpenReadWrite ),
    IF_DISKIO( sqlite3OsOpenExclusive ),
    IF_DISKIO( sqlite3OsOpenReadOnly ),
    IF_DISKIO( sqlite3OsDelete ),
    IF_DISKIO( sqlite3OsFileExists ),
    IF_DISKIO( sqlite3OsFullPathname ),
    IF_DISKIO( sqlite3OsIsDirWritable ),
    IF_DISKIO( sqlite3OsSyncDirectory ),
    IF_DISKIO( sqlite3OsTempFileName ),
    sqlite3OsRandomSeed,
    sqlite3OsSleep,
    sqlite3OsCurrentTime,
    sqlite3OsEnterMutex,
    sqlite3OsLeaveMutex,
    sqlite3OsInMutex,
    sqlite3OsThreadSpecificData,
    sqlite3OsMalloc,
    sqlite3OsRealloc,
    sqlite3OsFree,
    sqlite3OsAllocationSize
  };
#else
  /*
  ** Files other than os.c just reference the global virtual function table. 
  */
  extern struct sqlite3OsVtbl sqlite3Os;
#endif /* _SQLITE_OS_C_ */


/* This additional API routine is available with redefinable I/O */
struct sqlite3OsVtbl *sqlite3_os_switch(void);


/*
** Redefine the OS interface to go through the virtual function table
** rather than calling routines directly.
*/
#undef sqlite3OsOpenReadWrite
#undef sqlite3OsOpenExclusive
#undef sqlite3OsOpenReadOnly
#undef sqlite3OsDelete
#undef sqlite3OsFileExists
#undef sqlite3OsFullPathname
#undef sqlite3OsIsDirWritable
#undef sqlite3OsSyncDirectory
#undef sqlite3OsTempFileName
#undef sqlite3OsRandomSeed
#undef sqlite3OsSleep
#undef sqlite3OsCurrentTime
#undef sqlite3OsEnterMutex
#undef sqlite3OsLeaveMutex
#undef sqlite3OsInMutex
#undef sqlite3OsThreadSpecificData
#undef sqlite3OsMalloc
#undef sqlite3OsRealloc
#undef sqlite3OsFree
#undef sqlite3OsAllocationSize
#define sqlite3OsOpenReadWrite      sqlite3Os.xOpenReadWrite
#define sqlite3OsOpenExclusive      sqlite3Os.xOpenExclusive
#define sqlite3OsOpenReadOnly       sqlite3Os.xOpenReadOnly
#define sqlite3OsDelete             sqlite3Os.xDelete
#define sqlite3OsFileExists         sqlite3Os.xFileExists
#define sqlite3OsFullPathname       sqlite3Os.xFullPathname
#define sqlite3OsIsDirWritable      sqlite3Os.xIsDirWritable
#define sqlite3OsSyncDirectory      sqlite3Os.xSyncDirectory
#define sqlite3OsTempFileName       sqlite3Os.xTempFileName
#define sqlite3OsRandomSeed         sqlite3Os.xRandomSeed
#define sqlite3OsSleep              sqlite3Os.xSleep
#define sqlite3OsCurrentTime        sqlite3Os.xCurrentTime
#define sqlite3OsEnterMutex         sqlite3Os.xEnterMutex
#define sqlite3OsLeaveMutex         sqlite3Os.xLeaveMutex
#define sqlite3OsInMutex            sqlite3Os.xInMutex
#define sqlite3OsThreadSpecificData sqlite3Os.xThreadSpecificData
#define sqlite3OsMalloc             sqlite3Os.xMalloc
#define sqlite3OsRealloc            sqlite3Os.xRealloc
#define sqlite3OsFree               sqlite3Os.xFree
#define sqlite3OsAllocationSize     sqlite3Os.xAllocationSize

#endif /* SQLITE_ENABLE_REDEF_IO */

#endif /* _SQLITE_OS_H_ */

Changes to src/test1.c. 

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**    May you share freely, never taking more than you give.
**
*************************************************************************
** Code for testing the printf() interface to SQLite.  This code
** is not included in the SQLite library.  It is used for automated
** testing of the SQLite library.
**
** $Id: test1.c,v 1.182 2006/01/06 21:52:50 drh Exp $
*/
#include "sqliteInt.h"
#include "tcl.h"
#include "os.h"
#include <stdlib.h>
#include <string.h>

................................................................................
#endif

#ifdef SQLITE_OMIT_PROGRESS_CALLBACK
  Tcl_SetVar2(interp, "sqlite_options", "progress", "0", TCL_GLOBAL_ONLY);
#else
  Tcl_SetVar2(interp, "sqlite_options", "progress", "1", TCL_GLOBAL_ONLY);
#endif







#ifdef SQLITE_OMIT_REINDEX
  Tcl_SetVar2(interp, "sqlite_options", "reindex", "0", TCL_GLOBAL_ONLY);
#else
  Tcl_SetVar2(interp, "sqlite_options", "reindex", "1", TCL_GLOBAL_ONLY);
#endif









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**    May you share freely, never taking more than you give.
**
*************************************************************************
** Code for testing the printf() interface to SQLite.  This code
** is not included in the SQLite library.  It is used for automated
** testing of the SQLite library.
**
** $Id: test1.c,v 1.183 2006/01/07 16:06:07 drh Exp $
*/
#include "sqliteInt.h"
#include "tcl.h"
#include "os.h"
#include <stdlib.h>
#include <string.h>

................................................................................
#endif

#ifdef SQLITE_OMIT_PROGRESS_CALLBACK
  Tcl_SetVar2(interp, "sqlite_options", "progress", "0", TCL_GLOBAL_ONLY);
#else
  Tcl_SetVar2(interp, "sqlite_options", "progress", "1", TCL_GLOBAL_ONLY);
#endif

#ifdef SQLITE_ENABLE_REDEF_IO
  Tcl_SetVar2(interp, "sqlite_options", "redefio", "1", TCL_GLOBAL_ONLY);
#else
  Tcl_SetVar2(interp, "sqlite_options", "redefio", "0", TCL_GLOBAL_ONLY);
#endif

#ifdef SQLITE_OMIT_REINDEX
  Tcl_SetVar2(interp, "sqlite_options", "reindex", "0", TCL_GLOBAL_ONLY);
#else
  Tcl_SetVar2(interp, "sqlite_options", "reindex", "1", TCL_GLOBAL_ONLY);
#endif

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