/*
** 2001 September 15
**
** 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.
**
*************************************************************************
** Code for testing the pager.c module in SQLite. This code
** is not included in the SQLite library. It is used for automated
** testing of the SQLite library.
*/
#include "sqliteInt.h"
#include "tcl.h"
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
extern const char *sqlite3ErrName(int);
/*
** Page size and reserved size used for testing.
*/
static int test_pagesize = 1024;
/*
** Dummy page reinitializer
*/
static void pager_test_reiniter(DbPage *pNotUsed){
return;
}
/*
** Usage: pager_open FILENAME N-PAGE
**
** Open a new pager
*/
static int pager_open(
void *NotUsed,
Tcl_Interp *interp, /* The TCL interpreter that invoked this command */
int argc, /* Number of arguments */
const char **argv /* Text of each argument */
){
u32 pageSize;
Pager *pPager;
int nPage;
int rc;
char zBuf[100];
if( argc!=3 ){
Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
" FILENAME N-PAGE\"", 0);
return TCL_ERROR;
}
if( Tcl_GetInt(interp, argv[2], &nPage) ) return TCL_ERROR;
rc = sqlite3PagerOpen(sqlite3_vfs_find(0), &pPager, argv[1], 0, 0,
SQLITE_OPEN_READWRITE | SQLITE_OPEN_CREATE | SQLITE_OPEN_MAIN_DB,
pager_test_reiniter);
if( rc!=SQLITE_OK ){
Tcl_AppendResult(interp, sqlite3ErrName(rc), 0);
return TCL_ERROR;
}
sqlite3PagerSetCachesize(pPager, nPage);
pageSize = test_pagesize;
sqlite3PagerSetPagesize(pPager, &pageSize, -1);
sqlite3_snprintf(sizeof(zBuf),zBuf,"%p",pPager);
Tcl_AppendResult(interp, zBuf, 0);
return TCL_OK;
}
/*
** Usage: pager_close ID
**
** Close the given pager.
*/
static int pager_close(
void *NotUsed,
Tcl_Interp *interp, /* The TCL interpreter that invoked this command */
int argc, /* Number of arguments */
const char **argv /* Text of each argument */
){
Pager *pPager;
int rc;
if( argc!=2 ){
Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
" ID\"", 0);
return TCL_ERROR;
}
pPager = sqlite3TestTextToPtr(argv[1]);
rc = sqlite3PagerClose(pPager);
if( rc!=SQLITE_OK ){
Tcl_AppendResult(interp, sqlite3ErrName(rc), 0);
return TCL_ERROR;
}
return TCL_OK;
}
/*
** Usage: pager_rollback ID
**
** Rollback changes
*/
static int pager_rollback(
void *NotUsed,
Tcl_Interp *interp, /* The TCL interpreter that invoked this command */
int argc, /* Number of arguments */
const char **argv /* Text of each argument */
){
Pager *pPager;
int rc;
if( argc!=2 ){
Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
" ID\"", 0);
return TCL_ERROR;
}
pPager = sqlite3TestTextToPtr(argv[1]);
rc = sqlite3PagerRollback(pPager);
if( rc!=SQLITE_OK ){
Tcl_AppendResult(interp, sqlite3ErrName(rc), 0);
return TCL_ERROR;
}
return TCL_OK;
}
/*
** Usage: pager_commit ID
**
** Commit all changes
*/
static int pager_commit(
void *NotUsed,
Tcl_Interp *interp, /* The TCL interpreter that invoked this command */
int argc, /* Number of arguments */
const char **argv /* Text of each argument */
){
Pager *pPager;
int rc;
if( argc!=2 ){
Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
" ID\"", 0);
return TCL_ERROR;
}
pPager = sqlite3TestTextToPtr(argv[1]);
rc = sqlite3PagerCommitPhaseOne(pPager, 0, 0);
if( rc!=SQLITE_OK ){
Tcl_AppendResult(interp, sqlite3ErrName(rc), 0);
return TCL_ERROR;
}
rc = sqlite3PagerCommitPhaseTwo(pPager);
if( rc!=SQLITE_OK ){
Tcl_AppendResult(interp, sqlite3ErrName(rc), 0);
return TCL_ERROR;
}
return TCL_OK;
}
/*
** Usage: pager_stmt_begin ID
**
** Start a new checkpoint.
*/
static int pager_stmt_begin(
void *NotUsed,
Tcl_Interp *interp, /* The TCL interpreter that invoked this command */
int argc, /* Number of arguments */
const char **argv /* Text of each argument */
){
Pager *pPager;
int rc;
if( argc!=2 ){
Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
" ID\"", 0);
return TCL_ERROR;
}
pPager = sqlite3TestTextToPtr(argv[1]);
rc = sqlite3PagerOpenSavepoint(pPager, 1);
if( rc!=SQLITE_OK ){
Tcl_AppendResult(interp, sqlite3ErrName(rc), 0);
return TCL_ERROR;
}
return TCL_OK;
}
/*
** Usage: pager_stmt_rollback ID
**
** Rollback changes to a checkpoint
*/
static int pager_stmt_rollback(
void *NotUsed,
Tcl_Interp *interp, /* The TCL interpreter that invoked this command */
int argc, /* Number of arguments */
const char **argv /* Text of each argument */
){
Pager *pPager;
int rc;
if( argc!=2 ){
Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
" ID\"", 0);
return TCL_ERROR;
}
pPager = sqlite3TestTextToPtr(argv[1]);
rc = sqlite3PagerSavepoint(pPager, SAVEPOINT_ROLLBACK, 0);
sqlite3PagerSavepoint(pPager, SAVEPOINT_RELEASE, 0);
if( rc!=SQLITE_OK ){
Tcl_AppendResult(interp, sqlite3ErrName(rc), 0);
return TCL_ERROR;
}
return TCL_OK;
}
/*
** Usage: pager_stmt_commit ID
**
** Commit changes to a checkpoint
*/
static int pager_stmt_commit(
void *NotUsed,
Tcl_Interp *interp, /* The TCL interpreter that invoked this command */
int argc, /* Number of arguments */
const char **argv /* Text of each argument */
){
Pager *pPager;
int rc;
if( argc!=2 ){
Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
" ID\"", 0);
return TCL_ERROR;
}
pPager = sqlite3TestTextToPtr(argv[1]);
rc = sqlite3PagerSavepoint(pPager, SAVEPOINT_RELEASE, 0);
if( rc!=SQLITE_OK ){
Tcl_AppendResult(interp, sqlite3ErrName(rc), 0);
return TCL_ERROR;
}
return TCL_OK;
}
/*
** Usage: pager_stats ID
**
** Return pager statistics.
*/
static int pager_stats(
void *NotUsed,
Tcl_Interp *interp, /* The TCL interpreter that invoked this command */
int argc, /* Number of arguments */
const char **argv /* Text of each argument */
){
Pager *pPager;
int i, *a;
if( argc!=2 ){
Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
" ID\"", 0);
return TCL_ERROR;
}
pPager = sqlite3TestTextToPtr(argv[1]);
a = sqlite3PagerStats(pPager);
for(i=0; i<9; i++){
static char *zName[] = {
"ref", "page", "max", "size", "state", "err",
"hit", "miss", "ovfl",
};
char zBuf[100];
Tcl_AppendElement(interp, zName[i]);
sqlite3_snprintf(sizeof(zBuf),zBuf,"%d",a[i]);
Tcl_AppendElement(interp, zBuf);
}
return TCL_OK;
}
/*
** Usage: pager_pagecount ID
**
** Return the size of the database file.
*/
static int pager_pagecount(
void *NotUsed,
Tcl_Interp *interp, /* The TCL interpreter that invoked this command */
int argc, /* Number of arguments */
const char **argv /* Text of each argument */
){
Pager *pPager;
char zBuf[100];
int nPage;
if( argc!=2 ){
Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
" ID\"", 0);
return TCL_ERROR;
}
pPager = sqlite3TestTextToPtr(argv[1]);
sqlite3PagerPagecount(pPager, &nPage);
sqlite3_snprintf(sizeof(zBuf), zBuf, "%d", nPage);
Tcl_AppendResult(interp, zBuf, 0);
return TCL_OK;
}
/*
** Usage: page_get ID PGNO
**
** Return a pointer to a page from the database.
*/
static int page_get(
void *NotUsed,
Tcl_Interp *interp, /* The TCL interpreter that invoked this command */
int argc, /* Number of arguments */
const char **argv /* Text of each argument */
){
Pager *pPager;
char zBuf[100];
DbPage *pPage = 0;
int pgno;
int rc;
if( argc!=3 ){
Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
" ID PGNO\"", 0);
return TCL_ERROR;
}
pPager = sqlite3TestTextToPtr(argv[1]);
if( Tcl_GetInt(interp, argv[2], &pgno) ) return TCL_ERROR;
rc = sqlite3PagerSharedLock(pPager);
if( rc==SQLITE_OK ){
rc = sqlite3PagerGet(pPager, pgno, &pPage, 0);
}
if( rc!=SQLITE_OK ){
Tcl_AppendResult(interp, sqlite3ErrName(rc), 0);
return TCL_ERROR;
}
sqlite3_snprintf(sizeof(zBuf),zBuf,"%p",pPage);
Tcl_AppendResult(interp, zBuf, 0);
return TCL_OK;
}
/*
** Usage: page_lookup ID PGNO
**
** Return a pointer to a page if the page is already in cache.
** If not in cache, return an empty string.
*/
static int page_lookup(
void *NotUsed,
Tcl_Interp *interp, /* The TCL interpreter that invoked this command */
int argc, /* Number of arguments */
const char **argv /* Text of each argument */
){
Pager *pPager;
char zBuf[100];
DbPage *pPage;
int pgno;
if( argc!=3 ){
Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
" ID PGNO\"", 0);
return TCL_ERROR;
}
pPager = sqlite3TestTextToPtr(argv[1]);
if( Tcl_GetInt(interp, argv[2], &pgno) ) return TCL_ERROR;
pPage = sqlite3PagerLookup(pPager, pgno);
if( pPage ){
sqlite3_snprintf(sizeof(zBuf),zBuf,"%p",pPage);
Tcl_AppendResult(interp, zBuf, 0);
}
return TCL_OK;
}
/*
** Usage: pager_truncate ID PGNO
*/
static int pager_truncate(
void *NotUsed,
Tcl_Interp *interp, /* The TCL interpreter that invoked this command */
int argc, /* Number of arguments */
const char **argv /* Text of each argument */
){
Pager *pPager;
int pgno;
if( argc!=3 ){
Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
" ID PGNO\"", 0);
return TCL_ERROR;
}
pPager = sqlite3TestTextToPtr(argv[1]);
if( Tcl_GetInt(interp, argv[2], &pgno) ) return TCL_ERROR;
sqlite3PagerTruncateImage(pPager, pgno);
return TCL_OK;
}
/*
** Usage: page_unref PAGE
**
** Drop a pointer to a page.
*/
static int page_unref(
void *NotUsed,
Tcl_Interp *interp, /* The TCL interpreter that invoked this command */
int argc, /* Number of arguments */
const char **argv /* Text of each argument */
){
DbPage *pPage;
if( argc!=2 ){
Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
" PAGE\"", 0);
return TCL_ERROR;
}
pPage = (DbPage *)sqlite3TestTextToPtr(argv[1]);
sqlite3PagerUnref(pPage);
return TCL_OK;
}
/*
** Usage: page_read PAGE
**
** Return the content of a page
*/
static int page_read(
void *NotUsed,
Tcl_Interp *interp, /* The TCL interpreter that invoked this command */
int argc, /* Number of arguments */
const char **argv /* Text of each argument */
){
char zBuf[100];
DbPage *pPage;
if( argc!=2 ){
Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
" PAGE\"", 0);
return TCL_ERROR;
}
pPage = sqlite3TestTextToPtr(argv[1]);
memcpy(zBuf, sqlite3PagerGetData(pPage), sizeof(zBuf));
Tcl_AppendResult(interp, zBuf, 0);
return TCL_OK;
}
/*
** Usage: page_number PAGE
**
** Return the page number for a page.
*/
static int page_number(
void *NotUsed,
Tcl_Interp *interp, /* The TCL interpreter that invoked this command */
int argc, /* Number of arguments */
const char **argv /* Text of each argument */
){
char zBuf[100];
DbPage *pPage;
if( argc!=2 ){
Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
" PAGE\"", 0);
return TCL_ERROR;
}
pPage = (DbPage *)sqlite3TestTextToPtr(argv[1]);
sqlite3_snprintf(sizeof(zBuf), zBuf, "%d", sqlite3PagerPagenumber(pPage));
Tcl_AppendResult(interp, zBuf, 0);
return TCL_OK;
}
/*
** Usage: page_write PAGE DATA
**
** Write something into a page.
*/
static int page_write(
void *NotUsed,
Tcl_Interp *interp, /* The TCL interpreter that invoked this command */
int argc, /* Number of arguments */
const char **argv /* Text of each argument */
){
DbPage *pPage;
char *pData;
int rc;
if( argc!=3 ){
Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
" PAGE DATA\"", 0);
return TCL_ERROR;
}
pPage = (DbPage *)sqlite3TestTextToPtr(argv[1]);
rc = sqlite3PagerWrite(pPage);
if( rc!=SQLITE_OK ){
Tcl_AppendResult(interp, sqlite3ErrName(rc), 0);
return TCL_ERROR;
}
pData = sqlite3PagerGetData(pPage);
strncpy(pData, argv[2], test_pagesize-1);
pData[test_pagesize-1] = 0;
return TCL_OK;
}
#ifndef SQLITE_OMIT_DISKIO
/*
** Usage: fake_big_file N FILENAME
**
** Write a few bytes at the N megabyte point of FILENAME. This will
** create a large file. If the file was a valid SQLite database, then
** the next time the database is opened, SQLite will begin allocating
** new pages after N. If N is 2096 or bigger, this will test the
** ability of SQLite to write to large files.
*/
static int fake_big_file(
void *NotUsed,
Tcl_Interp *interp, /* The TCL interpreter that invoked this command */
int argc, /* Number of arguments */
const char **argv /* Text of each argument */
){
sqlite3_vfs *pVfs;
sqlite3_file *fd = 0;
int rc;
int n;
i64 offset;
char *zFile;
int nFile;
if( argc!=3 ){
Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
" N-MEGABYTES FILE\"", 0);
return TCL_ERROR;
}
if( Tcl_GetInt(interp, argv[1], &n) ) return TCL_ERROR;
pVfs = sqlite3_vfs_find(0);
nFile = (int)strlen(argv[2]);
zFile = sqlite3_malloc( nFile+2 );
if( zFile==0 ) return TCL_ERROR;
memcpy(zFile, argv[2], nFile+1);
zFile[nFile+1] = 0;
rc = sqlite3OsOpenMalloc(pVfs, zFile, &fd,
(SQLITE_OPEN_CREATE|SQLITE_OPEN_READWRITE|SQLITE_OPEN_MAIN_DB), 0
);
if( rc ){
Tcl_AppendResult(interp, "open failed: ", sqlite3ErrName(rc), 0);
sqlite3_free(zFile);
return TCL_ERROR;
}
offset = n;
offset *= 1024*1024;
rc = sqlite3OsWrite(fd, "Hello, World!", 14, offset);
sqlite3OsCloseFree(fd);
sqlite3_free(zFile);
if( rc ){
Tcl_AppendResult(interp, "write failed: ", sqlite3ErrName(rc), 0);
return TCL_ERROR;
}
return TCL_OK;
}
#endif
/*
** test_control_pending_byte PENDING_BYTE
**
** Set the PENDING_BYTE using the sqlite3_test_control() interface.
*/
static int testPendingByte(
void *NotUsed,
Tcl_Interp *interp, /* The TCL interpreter that invoked this command */
int argc, /* Number of arguments */
const char **argv /* Text of each argument */
){
int pbyte;
int rc;
if( argc!=2 ){
Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
" PENDING-BYTE\"", (void*)0);
return TCL_ERROR;
}
if( Tcl_GetInt(interp, argv[1], &pbyte) ) return TCL_ERROR;
rc = sqlite3_test_control(SQLITE_TESTCTRL_PENDING_BYTE, pbyte);
Tcl_SetObjResult(interp, Tcl_NewIntObj(rc));
return TCL_OK;
}
/*
** The sqlite3FaultSim() callback:
*/
static Tcl_Interp *faultSimInterp = 0;
static int faultSimScriptSize = 0;
static char *faultSimScript;
static int faultSimCallback(int x){
char zInt[30];
int i;
int isNeg;
int rc;
if( x==0 ){
memcpy(faultSimScript+faultSimScriptSize, "0", 2);
}else{
/* Convert x to text without using any sqlite3 routines */
if( x<0 ){
isNeg = 1;
x = -x;
}else{
isNeg = 0;
}
zInt[sizeof(zInt)-1] = 0;
for(i=sizeof(zInt)-2; i>0 && x>0; i--, x /= 10){
zInt[i] = (x%10) + '0';
}
if( isNeg ) zInt[i--] = '-';
memcpy(faultSimScript+faultSimScriptSize, zInt+i+1, sizeof(zInt)-i);
}
rc = Tcl_Eval(faultSimInterp, faultSimScript);
if( rc ){
fprintf(stderr, "fault simulator script failed: [%s]", faultSimScript);
rc = SQLITE_ERROR;
}else{
rc = atoi(Tcl_GetStringResult(faultSimInterp));
}
Tcl_ResetResult(faultSimInterp);
return rc;
}
/*
** sqlite3_test_control_fault_install SCRIPT
**
** Arrange to invoke SCRIPT with the integer argument to sqlite3FaultSim()
** appended, whenever sqlite3FaultSim() is called. Or, if SCRIPT is the
** empty string, cancel the sqlite3FaultSim() callback.
*/
static int faultInstallCmd(
void *NotUsed,
Tcl_Interp *interp, /* The TCL interpreter that invoked this command */
int argc, /* Number of arguments */
const char **argv /* Text of each argument */
){
const char *zScript;
int nScript;
int rc;
if( argc!=1 && argc!=2 ){
Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
" SCRIPT\"", (void*)0);
}
zScript = argc==2 ? argv[1] : "";
nScript = (int)strlen(zScript);
if( faultSimScript ){
free(faultSimScript);
faultSimScript = 0;
}
if( nScript==0 ){
rc = sqlite3_test_control(SQLITE_TESTCTRL_FAULT_INSTALL, 0);
}else{
faultSimScript = malloc( nScript+100 );
if( faultSimScript==0 ){
Tcl_AppendResult(interp, "out of memory", (void*)0);
return SQLITE_ERROR;
}
memcpy(faultSimScript, zScript, nScript);
faultSimScript[nScript] = ' ';
faultSimScriptSize = nScript+1;
faultSimInterp = interp;
rc = sqlite3_test_control(SQLITE_TESTCTRL_FAULT_INSTALL, faultSimCallback);
}
Tcl_SetObjResult(interp, Tcl_NewIntObj(rc));
return SQLITE_OK;
}
/*
** sqlite3BitvecBuiltinTest SIZE PROGRAM
**
** Invoke the SQLITE_TESTCTRL_BITVEC_TEST operator on test_control.
** See comments on sqlite3BitvecBuiltinTest() for additional information.
*/
static int testBitvecBuiltinTest(
void *NotUsed,
Tcl_Interp *interp, /* The TCL interpreter that invoked this command */
int argc, /* Number of arguments */
const char **argv /* Text of each argument */
){
int sz, rc;
int nProg = 0;
int aProg[100];
const char *z;
if( argc!=3 ){
Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
" SIZE PROGRAM\"", (void*)0);
}
if( Tcl_GetInt(interp, argv[1], &sz) ) return TCL_ERROR;
z = argv[2];
while( nProg<99 && *z ){
while( *z && !sqlite3Isdigit(*z) ){ z++; }
if( *z==0 ) break;
aProg[nProg++] = atoi(z);
while( sqlite3Isdigit(*z) ){ z++; }
}
aProg[nProg] = 0;
rc = sqlite3_test_control(SQLITE_TESTCTRL_BITVEC_TEST, sz, aProg);
Tcl_SetObjResult(interp, Tcl_NewIntObj(rc));
return TCL_OK;
}
/*
** Register commands with the TCL interpreter.
*/
int Sqlitetest2_Init(Tcl_Interp *interp){
extern int sqlite3_io_error_persist;
extern int sqlite3_io_error_pending;
extern int sqlite3_io_error_hit;
extern int sqlite3_io_error_hardhit;
extern int sqlite3_diskfull_pending;
extern int sqlite3_diskfull;
static struct {
char *zName;
Tcl_CmdProc *xProc;
} aCmd[] = {
{ "pager_open", (Tcl_CmdProc*)pager_open },
{ "pager_close", (Tcl_CmdProc*)pager_close },
{ "pager_commit", (Tcl_CmdProc*)pager_commit },
{ "pager_rollback", (Tcl_CmdProc*)pager_rollback },
{ "pager_stmt_begin", (Tcl_CmdProc*)pager_stmt_begin },
{ "pager_stmt_commit", (Tcl_CmdProc*)pager_stmt_commit },
{ "pager_stmt_rollback", (Tcl_CmdProc*)pager_stmt_rollback },
{ "pager_stats", (Tcl_CmdProc*)pager_stats },
{ "pager_pagecount", (Tcl_CmdProc*)pager_pagecount },
{ "page_get", (Tcl_CmdProc*)page_get },
{ "page_lookup", (Tcl_CmdProc*)page_lookup },
{ "page_unref", (Tcl_CmdProc*)page_unref },
{ "page_read", (Tcl_CmdProc*)page_read },
{ "page_write", (Tcl_CmdProc*)page_write },
{ "page_number", (Tcl_CmdProc*)page_number },
{ "pager_truncate", (Tcl_CmdProc*)pager_truncate },
#ifndef SQLITE_OMIT_DISKIO
{ "fake_big_file", (Tcl_CmdProc*)fake_big_file },
#endif
{ "sqlite3BitvecBuiltinTest",(Tcl_CmdProc*)testBitvecBuiltinTest },
{ "sqlite3_test_control_pending_byte", (Tcl_CmdProc*)testPendingByte },
{ "sqlite3_test_control_fault_install", (Tcl_CmdProc*)faultInstallCmd },
};
int i;
for(i=0; i<sizeof(aCmd)/sizeof(aCmd[0]); i++){
Tcl_CreateCommand(interp, aCmd[i].zName, aCmd[i].xProc, 0, 0);
}
Tcl_LinkVar(interp, "sqlite_io_error_pending",
(char*)&sqlite3_io_error_pending, TCL_LINK_INT);
Tcl_LinkVar(interp, "sqlite_io_error_persist",
(char*)&sqlite3_io_error_persist, TCL_LINK_INT);
Tcl_LinkVar(interp, "sqlite_io_error_hit",
(char*)&sqlite3_io_error_hit, TCL_LINK_INT);
Tcl_LinkVar(interp, "sqlite_io_error_hardhit",
(char*)&sqlite3_io_error_hardhit, TCL_LINK_INT);
Tcl_LinkVar(interp, "sqlite_diskfull_pending",
(char*)&sqlite3_diskfull_pending, TCL_LINK_INT);
Tcl_LinkVar(interp, "sqlite_diskfull",
(char*)&sqlite3_diskfull, TCL_LINK_INT);
#ifndef SQLITE_OMIT_WSD
Tcl_LinkVar(interp, "sqlite_pending_byte",
(char*)&sqlite3PendingByte, TCL_LINK_INT | TCL_LINK_READ_ONLY);
#endif
return TCL_OK;
}