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Overview
| Comment: | Improvements to OS layer tracing on the unix backend. (CVS 3664) |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: |
3ad96dbe09b99bd5f623de0de3072a25 |
| User & Date: | drh 2007-02-27 02:01:14 |
Context
|
2007-02-28
| ||
| 04:47 | Add the undocumented and experimental I/O tracing interface. This interface is likely to change and may be completely abandoned in the near future. (CVS 3665) check-in: 007ca283 user: drh tags: trunk | |
|
2007-02-27
| ||
| 02:01 | Improvements to OS layer tracing on the unix backend. (CVS 3664) check-in: 3ad96dbe user: drh tags: trunk | |
|
2007-02-24
| ||
| 15:29 | Add comments to sqlite3ExprCompare() to clarify its operation. Ticket #2216. (CVS 3663) check-in: fba0a1e5 user: drh tags: trunk | |
Changes
Changes to src/os_unix.c.
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/*
** Seek to the offset in id->offset then read cnt bytes into pBuf.
** Return the number of bytes actually read. Update the offset.
*/
static int seekAndRead(unixFile *id, void *pBuf, int cnt){
int got;
i64 newOffset;
#ifdef USE_PREAD
got = pread(id->h, pBuf, cnt, id->offset);
#else
newOffset = lseek(id->h, id->offset, SEEK_SET);
if( newOffset!=id->offset ){
return -1;
}
got = read(id->h, pBuf, cnt);
#endif
if( got>0 ){
id->offset += got;
}
return got;
}
/*
................................................................................
** Read data from a file into a buffer. Return SQLITE_OK if all
** bytes were read successfully and SQLITE_IOERR if anything goes
** wrong.
*/
static int unixRead(OsFile *id, void *pBuf, int amt){
int got;
assert( id );
TIMER_START;
got = seekAndRead((unixFile*)id, pBuf, amt);
TIMER_END;
TRACE5("READ %-3d %5d %7d %d\n", ((unixFile*)id)->h, got,
last_page, TIMER_ELAPSED);
SEEK(0);
SimulateIOError( got = -1 );
if( got==amt ){
return SQLITE_OK;
}else if( got<0 ){
return SQLITE_IOERR_READ;
}else{
memset(&((char*)pBuf)[got], 0, amt-got);
................................................................................
/*
** Seek to the offset in id->offset then read cnt bytes into pBuf.
** Return the number of bytes actually read. Update the offset.
*/
static int seekAndWrite(unixFile *id, const void *pBuf, int cnt){
int got;
i64 newOffset;
#ifdef USE_PREAD
got = pwrite(id->h, pBuf, cnt, id->offset);
#else
newOffset = lseek(id->h, id->offset, SEEK_SET);
if( newOffset!=id->offset ){
return -1;
}
got = write(id->h, pBuf, cnt);
#endif
if( got>0 ){
id->offset += got;
}
return got;
}
................................................................................
** Write data from a buffer into a file. Return SQLITE_OK on success
** or some other error code on failure.
*/
static int unixWrite(OsFile *id, const void *pBuf, int amt){
int wrote = 0;
assert( id );
assert( amt>0 );
TIMER_START;
while( amt>0 && (wrote = seekAndWrite((unixFile*)id, pBuf, amt))>0 ){
amt -= wrote;
pBuf = &((char*)pBuf)[wrote];
}
TIMER_END;
TRACE5("WRITE %-3d %5d %7d %d\n", ((unixFile*)id)->h, wrote,
last_page, TIMER_ELAPSED);
SEEK(0);
SimulateIOError(( wrote=(-1), amt=1 ));
SimulateDiskfullError(( wrote=0, amt=1 ));
if( amt>0 ){
if( wrote<0 ){
return SQLITE_IOERR_WRITE;
}else{
return SQLITE_FULL;
................................................................................
}
/*
** Move the read/write pointer in a file.
*/
static int unixSeek(OsFile *id, i64 offset){
assert( id );
SEEK(offset/1024 + 1);
#ifdef SQLITE_TEST
if( offset ) SimulateDiskfullError(return SQLITE_FULL);
#endif
((unixFile*)id)->offset = offset;
return SQLITE_OK;
}
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/*
** Seek to the offset in id->offset then read cnt bytes into pBuf.
** Return the number of bytes actually read. Update the offset.
*/
static int seekAndRead(unixFile *id, void *pBuf, int cnt){
int got;
i64 newOffset;
TIMER_START;
#ifdef USE_PREAD
got = pread(id->h, pBuf, cnt, id->offset);
#else
newOffset = lseek(id->h, id->offset, SEEK_SET);
if( newOffset!=id->offset ){
return -1;
}
got = read(id->h, pBuf, cnt);
#endif
TIMER_END;
TRACE5("READ %-3d %5d %7lld %d\n", id->h, got, id->offset, TIMER_ELAPSED);
if( got>0 ){
id->offset += got;
}
return got;
}
/*
................................................................................
** Read data from a file into a buffer. Return SQLITE_OK if all
** bytes were read successfully and SQLITE_IOERR if anything goes
** wrong.
*/
static int unixRead(OsFile *id, void *pBuf, int amt){
int got;
assert( id );
got = seekAndRead((unixFile*)id, pBuf, amt);
SimulateIOError( got = -1 );
if( got==amt ){
return SQLITE_OK;
}else if( got<0 ){
return SQLITE_IOERR_READ;
}else{
memset(&((char*)pBuf)[got], 0, amt-got);
................................................................................
/*
** Seek to the offset in id->offset then read cnt bytes into pBuf.
** Return the number of bytes actually read. Update the offset.
*/
static int seekAndWrite(unixFile *id, const void *pBuf, int cnt){
int got;
i64 newOffset;
TIMER_START;
#ifdef USE_PREAD
got = pwrite(id->h, pBuf, cnt, id->offset);
#else
newOffset = lseek(id->h, id->offset, SEEK_SET);
if( newOffset!=id->offset ){
return -1;
}
got = write(id->h, pBuf, cnt);
#endif
TIMER_END;
TRACE5("WRITE %-3d %5d %7lld %d\n", id->h, got, id->offset, TIMER_ELAPSED);
if( got>0 ){
id->offset += got;
}
return got;
}
................................................................................
** Write data from a buffer into a file. Return SQLITE_OK on success
** or some other error code on failure.
*/
static int unixWrite(OsFile *id, const void *pBuf, int amt){
int wrote = 0;
assert( id );
assert( amt>0 );
while( amt>0 && (wrote = seekAndWrite((unixFile*)id, pBuf, amt))>0 ){
amt -= wrote;
pBuf = &((char*)pBuf)[wrote];
}
SimulateIOError(( wrote=(-1), amt=1 ));
SimulateDiskfullError(( wrote=0, amt=1 ));
if( amt>0 ){
if( wrote<0 ){
return SQLITE_IOERR_WRITE;
}else{
return SQLITE_FULL;
................................................................................
}
/*
** Move the read/write pointer in a file.
*/
static int unixSeek(OsFile *id, i64 offset){
assert( id );
#ifdef SQLITE_TEST
if( offset ) SimulateDiskfullError(return SQLITE_FULL);
#endif
((unixFile*)id)->offset = offset;
return SQLITE_OK;
}
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