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Overview
| Comment: | Merge the improved anti-virus defenses into the trunk. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: | 0207fd9b0c0f6baa3c2cb8ba588ad585 |
| User & Date: | drh 2011-07-12 14:38:25 |
Context
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2011-07-13
| ||
| 16:03 | Added the SQLITE_FCNTL_WIN32_AV_RETRY file control for configuring the retry counts and delays in the windows VFS. check-in: 7aaf0a6a user: drh tags: trunk | |
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2011-07-12
| ||
| 14:38 | Merge the improved anti-virus defenses into the trunk. check-in: 0207fd9b user: drh tags: trunk | |
| 14:02 | Revise logic in winDelete to check the file prior to attempting to delete it. Closed-Leaf check-in: 36f11acc user: mistachkin tags: av-defense | |
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2011-07-11
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| 23:45 | Update the TCL commands for setting windows manditory locks. Add test cases for manditory lock delays under windows. check-in: 03af4c17 user: drh tags: trunk | |
Changes
Changes to src/os_win.c.
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iLine, iErrno, zFunc, zPath, zMsg
);
return errcode;
}
/*
** The number of times that a ReadFile() or WriteFile() will be retried
** following a locking error.
*/
#ifndef SQLITE_WIN32_IOERR_RETRY
# define SQLITE_WIN32_IOERR_RETRY 5
#endif
/*
** If a ReadFile() or WriteFile() error occurs, invoke this routine
** to see if it should be retried. Return TRUE to retry. Return FALSE
** to give up with an error.
*/
static int retryIoerr(int *pnRetry){
DWORD e;
if( *pnRetry>=SQLITE_WIN32_IOERR_RETRY ){
return 0;
}
e = GetLastError();
if( e==ERROR_LOCK_VIOLATION || e==ERROR_SHARING_VIOLATION ){
Sleep(50 + 50*(*pnRetry));
++*pnRetry;
return 1;
}
return 0;
}
#if SQLITE_OS_WINCE
/*************************************************************************
** This section contains code for WinCE only.
*/
/*
** WindowsCE does not have a localtime() function. So create a
................................................................................
return SQLITE_FULL;
}
while( !ReadFile(pFile->h, pBuf, amt, &nRead, 0) ){
if( retryIoerr(&nRetry) ) continue;
pFile->lastErrno = GetLastError();
return winLogError(SQLITE_IOERR_READ, "winRead", pFile->zPath);
}
if( nRead<(DWORD)amt ){
/* Unread parts of the buffer must be zero-filled */
memset(&((char*)pBuf)[nRead], 0, amt-nRead);
return SQLITE_IOERR_SHORT_READ;
}
return SQLITE_OK;
................................................................................
sqlite3_file *id, /* File to write into */
const void *pBuf, /* The bytes to be written */
int amt, /* Number of bytes to write */
sqlite3_int64 offset /* Offset into the file to begin writing at */
){
int rc; /* True if error has occured, else false */
winFile *pFile = (winFile*)id; /* File handle */
assert( amt>0 );
assert( pFile );
SimulateIOError(return SQLITE_IOERR_WRITE);
SimulateDiskfullError(return SQLITE_FULL);
OSTRACE(("WRITE %d lock=%d\n", pFile->h, pFile->locktype));
rc = seekWinFile(pFile, offset);
if( rc==0 ){
u8 *aRem = (u8 *)pBuf; /* Data yet to be written */
int nRem = amt; /* Number of bytes yet to be written */
DWORD nWrite; /* Bytes written by each WriteFile() call */
int nRetry = 0; /* Number of retries */
while( nRem>0 ){
if( !WriteFile(pFile->h, aRem, nRem, &nWrite, 0) ){
if( retryIoerr(&nRetry) ) continue;
break;
}
if( nWrite<=0 ) break;
................................................................................
if( rc ){
if( ( pFile->lastErrno==ERROR_HANDLE_DISK_FULL )
|| ( pFile->lastErrno==ERROR_DISK_FULL )){
return SQLITE_FULL;
}
return winLogError(SQLITE_IOERR_WRITE, "winWrite", pFile->zPath);
}
return SQLITE_OK;
}
/*
** Truncate an open file to a specified size
*/
................................................................................
** will open a journal file shortly after it is created in order to do
** whatever it does. While this other process is holding the
** file open, we will be unable to delete it. To work around this
** problem, we delay 100 milliseconds and try to delete again. Up
** to MX_DELETION_ATTEMPTs deletion attempts are run before giving
** up and returning an error.
*/
#define MX_DELETION_ATTEMPTS 5
static int winDelete(
sqlite3_vfs *pVfs, /* Not used on win32 */
const char *zFilename, /* Name of file to delete */
int syncDir /* Not used on win32 */
){
int cnt = 0;
DWORD rc;
DWORD error = 0;
void *zConverted;
UNUSED_PARAMETER(pVfs);
UNUSED_PARAMETER(syncDir);
SimulateIOError(return SQLITE_IOERR_DELETE);
zConverted = convertUtf8Filename(zFilename);
if( zConverted==0 ){
return SQLITE_NOMEM;
}
if( isNT() ){
do{
DeleteFileW(zConverted);
}while( ( ((rc = GetFileAttributesW(zConverted)) != INVALID_FILE_ATTRIBUTES)
|| ((error = GetLastError()) == ERROR_ACCESS_DENIED))
&& (++cnt < MX_DELETION_ATTEMPTS)
&& (Sleep(100), 1) );
/* isNT() is 1 if SQLITE_OS_WINCE==1, so this else is never executed.
** Since the ASCII version of these Windows API do not exist for WINCE,
** it's important to not reference them for WINCE builds.
*/
#if SQLITE_OS_WINCE==0
}else{
do{
DeleteFileA(zConverted);
}while( ( ((rc = GetFileAttributesA(zConverted)) != INVALID_FILE_ATTRIBUTES)
|| ((error = GetLastError()) == ERROR_ACCESS_DENIED))
&& (++cnt < MX_DELETION_ATTEMPTS)
&& (Sleep(100), 1) );
#endif
}
free(zConverted);
OSTRACE(("DELETE \"%s\" %s\n", zFilename,
( (rc==INVALID_FILE_ATTRIBUTES) && (error==ERROR_FILE_NOT_FOUND)) ?
"ok" : "failed" ));
return ( (rc == INVALID_FILE_ATTRIBUTES)
&& (error == ERROR_FILE_NOT_FOUND)) ? SQLITE_OK :
winLogError(SQLITE_IOERR_DELETE, "winDelete", zFilename);
}
/*
** Check the existance and status of a file.
*/
static int winAccess(
sqlite3_vfs *pVfs, /* Not used on win32 */
|
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iLine, iErrno, zFunc, zPath, zMsg
);
return errcode;
}
/*
** The number of times that a ReadFile(), WriteFile(), and DeleteFile()
** will be retried following a locking error - probably caused by
** antivirus software. Also the initial delay before the first retry.
** The delay increases linearly with each retry.
*/
#ifndef SQLITE_WIN32_IOERR_RETRY
# define SQLITE_WIN32_IOERR_RETRY 10
#endif
#ifndef SQLITE_WIN32_IOERR_RETRY_DELAY
# define SQLITE_WIN32_IOERR_RETRY_DELAY 25
#endif
/*
** If a ReadFile() or WriteFile() error occurs, invoke this routine
** to see if it should be retried. Return TRUE to retry. Return FALSE
** to give up with an error.
*/
static int retryIoerr(int *pnRetry){
DWORD e;
if( *pnRetry>=SQLITE_WIN32_IOERR_RETRY ){
return 0;
}
e = GetLastError();
if( e==ERROR_ACCESS_DENIED ||
e==ERROR_LOCK_VIOLATION ||
e==ERROR_SHARING_VIOLATION ){
Sleep(SQLITE_WIN32_IOERR_RETRY_DELAY*(1+*pnRetry));
++*pnRetry;
return 1;
}
return 0;
}
/*
** Log a I/O error retry episode.
*/
static void logIoerr(int nRetry){
if( nRetry ){
sqlite3_log(SQLITE_IOERR,
"delayed %dms for lock/sharing conflict",
SQLITE_WIN32_IOERR_RETRY_DELAY*nRetry*(nRetry+1)/2
);
}
}
#if SQLITE_OS_WINCE
/*************************************************************************
** This section contains code for WinCE only.
*/
/*
** WindowsCE does not have a localtime() function. So create a
................................................................................
return SQLITE_FULL;
}
while( !ReadFile(pFile->h, pBuf, amt, &nRead, 0) ){
if( retryIoerr(&nRetry) ) continue;
pFile->lastErrno = GetLastError();
return winLogError(SQLITE_IOERR_READ, "winRead", pFile->zPath);
}
logIoerr(nRetry);
if( nRead<(DWORD)amt ){
/* Unread parts of the buffer must be zero-filled */
memset(&((char*)pBuf)[nRead], 0, amt-nRead);
return SQLITE_IOERR_SHORT_READ;
}
return SQLITE_OK;
................................................................................
sqlite3_file *id, /* File to write into */
const void *pBuf, /* The bytes to be written */
int amt, /* Number of bytes to write */
sqlite3_int64 offset /* Offset into the file to begin writing at */
){
int rc; /* True if error has occured, else false */
winFile *pFile = (winFile*)id; /* File handle */
int nRetry = 0; /* Number of retries */
assert( amt>0 );
assert( pFile );
SimulateIOError(return SQLITE_IOERR_WRITE);
SimulateDiskfullError(return SQLITE_FULL);
OSTRACE(("WRITE %d lock=%d\n", pFile->h, pFile->locktype));
rc = seekWinFile(pFile, offset);
if( rc==0 ){
u8 *aRem = (u8 *)pBuf; /* Data yet to be written */
int nRem = amt; /* Number of bytes yet to be written */
DWORD nWrite; /* Bytes written by each WriteFile() call */
while( nRem>0 ){
if( !WriteFile(pFile->h, aRem, nRem, &nWrite, 0) ){
if( retryIoerr(&nRetry) ) continue;
break;
}
if( nWrite<=0 ) break;
................................................................................
if( rc ){
if( ( pFile->lastErrno==ERROR_HANDLE_DISK_FULL )
|| ( pFile->lastErrno==ERROR_DISK_FULL )){
return SQLITE_FULL;
}
return winLogError(SQLITE_IOERR_WRITE, "winWrite", pFile->zPath);
}else{
logIoerr(nRetry);
}
return SQLITE_OK;
}
/*
** Truncate an open file to a specified size
*/
................................................................................
** will open a journal file shortly after it is created in order to do
** whatever it does. While this other process is holding the
** file open, we will be unable to delete it. To work around this
** problem, we delay 100 milliseconds and try to delete again. Up
** to MX_DELETION_ATTEMPTs deletion attempts are run before giving
** up and returning an error.
*/
static int winDelete(
sqlite3_vfs *pVfs, /* Not used on win32 */
const char *zFilename, /* Name of file to delete */
int syncDir /* Not used on win32 */
){
int cnt = 0;
int rc;
void *zConverted;
UNUSED_PARAMETER(pVfs);
UNUSED_PARAMETER(syncDir);
SimulateIOError(return SQLITE_IOERR_DELETE);
zConverted = convertUtf8Filename(zFilename);
if( zConverted==0 ){
return SQLITE_NOMEM;
}
if( isNT() ){
rc = 1;
while( GetFileAttributesW(zConverted)!=INVALID_FILE_ATTRIBUTES &&
(rc = DeleteFileW(zConverted))==0 && retryIoerr(&cnt) ){}
rc = rc ? SQLITE_OK : SQLITE_ERROR;
/* isNT() is 1 if SQLITE_OS_WINCE==1, so this else is never executed.
** Since the ASCII version of these Windows API do not exist for WINCE,
** it's important to not reference them for WINCE builds.
*/
#if SQLITE_OS_WINCE==0
}else{
rc = 1;
while( GetFileAttributesA(zConverted)!=INVALID_FILE_ATTRIBUTES &&
(rc = DeleteFileA(zConverted))==0 && retryIoerr(&cnt) ){}
rc = rc ? SQLITE_OK : SQLITE_ERROR;
#endif
}
if( rc ){
rc = winLogError(SQLITE_IOERR_DELETE, "winDelete", zFilename);
}else{
logIoerr(cnt);
}
free(zConverted);
OSTRACE(("DELETE \"%s\" %s\n", zFilename, (rc ? "failed" : "ok" )));
return rc;
}
/*
** Check the existance and status of a file.
*/
static int winAccess(
sqlite3_vfs *pVfs, /* Not used on win32 */
|
Changes to test/wal6.test.
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CREATE TABLE t1(a INTEGER PRIMARY KEY, b);
INSERT INTO t1 VALUES(1,2);
SELECT * FROM t1;
}
} {1 2}
# Under Windows, you'll get an error trying to delete
# a file this is already opened. For now, make sure
# we get that error, then close the first connection
# so the other tests work.
if {$tcl_platform(platform)=="windows"} {
if {$jmode=="persist" || $jmode=="truncate"} {
do_test wal6-1.2.$jmode.win {
sqlite3 db2 test.db
catchsql {
PRAGMA journal_mode=WAL;
} db2
} {1 {disk I/O error}}
db2 close
db close
}
}
do_test wal6-1.2.$jmode {
sqlite3 db2 test.db
execsql {
PRAGMA journal_mode=WAL;
................................................................................
db close
db2 close
forcedelete test.db
}
finish_test
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CREATE TABLE t1(a INTEGER PRIMARY KEY, b);
INSERT INTO t1 VALUES(1,2);
SELECT * FROM t1;
}
} {1 2}
# Under Windows, you'll get an error trying to delete
# a file this is already opened. Close the first connection
# so the other tests work.
if {$tcl_platform(platform)=="windows"} {
if {$jmode=="persist" || $jmode=="truncate"} {
db close
}
}
do_test wal6-1.2.$jmode {
sqlite3 db2 test.db
execsql {
PRAGMA journal_mode=WAL;
................................................................................
db close
db2 close
forcedelete test.db
}
finish_test
|
Changes to test/win32lock.test.
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if {$tcl_platform(platform)!="windows"} return
set testdir [file dirname $argv0]
source $testdir/tester.tcl
set testprefix win32lock
do_test win32lock-1.1 {
db eval {
PRAGMA cache_size=10;
CREATE TABLE t1(x,y);
INSERT INTO t1 VALUES(1,randomblob(100000));
INSERT INTO t1 VALUES(2,randomblob(50000));
INSERT INTO t1 VALUES(3,randomblob(25000));
................................................................................
set ::msg
} {disk I/O error}
break
} else {
do_test win32lock-1.2-$delay1 {
set ::msg
} {1 100000 2 50000 3 25000 4 12500}
incr delay1 50
}
}
sqlite3_test_control_pending_byte $old_pending_byte
finish_test
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if {$tcl_platform(platform)!="windows"} return
set testdir [file dirname $argv0]
source $testdir/tester.tcl
set testprefix win32lock
db close
sqlite3_shutdown
test_sqlite3_log xLog
proc xLog {error_code msg} {
lappend ::log $msg
}
sqlite3 db test.db
do_test win32lock-1.1 {
db eval {
PRAGMA cache_size=10;
CREATE TABLE t1(x,y);
INSERT INTO t1 VALUES(1,randomblob(100000));
INSERT INTO t1 VALUES(2,randomblob(50000));
INSERT INTO t1 VALUES(3,randomblob(25000));
................................................................................
set ::msg
} {disk I/O error}
break
} else {
do_test win32lock-1.2-$delay1 {
set ::msg
} {1 100000 2 50000 3 25000 4 12500}
if {$::log!=""} {
do_test win32lock-1.2-$delay1-log1 {
regsub {\d+} $::log # x
set x
} {{delayed #ms for lock/sharing conflict}}
}
incr delay1 50
}
set ::log {}
}
sqlite3_test_control_pending_byte $old_pending_byte
sqlite3_shutdown
test_sqlite3_log
sqlite3_initialize
finish_test
|