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Overview
| Comment: | Simplification to the read and write primatives in the unix VFS. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: |
9eefa449792f03c4c149edcbc6b9b769 |
| User & Date: | drh 2015-12-01 16:21:35 |
Context
|
2015-12-01
| ||
| 17:48 | The test_fs.c test module now works on Windows. (check-in: e3d86284 user: drh tags: trunk) | |
| 16:21 | Simplification to the read and write primatives in the unix VFS. (check-in: 9eefa449 user: drh tags: trunk) | |
|
2015-11-30
| ||
| 22:52 | Add the SQLITE_PRINTF_PRECISION_LIMIT compile-time option. (check-in: ecad75d6 user: drh tags: trunk) | |
Changes
Changes to src/os_unix.c.
3082 3083 3084 3085 3086 3087 3088 3089 3090 3091 3092 3093 3094 3095 3096 3097 3098 3099 3100 3101 3102 .... 3187 3188 3189 3190 3191 3192 3193 3194 3195 3196 3197 3198 3199 3200 3201 3202 3203 3204 3205 3206 3207 3208 3209 3210 3211 3212 3213 3214 3215 3216 3217 3218 3219 3220 3221 3222 3223 3224 .... 4406 4407 4408 4409 4410 4411 4412 4413 4414 4415 4416 4417 4418 4419 4420 |
got = osPread(id->h, pBuf, cnt, offset);
SimulateIOError( got = -1 );
#elif defined(USE_PREAD64)
got = osPread64(id->h, pBuf, cnt, offset);
SimulateIOError( got = -1 );
#else
newOffset = lseek(id->h, offset, SEEK_SET);
SimulateIOError( newOffset-- );
if( newOffset!=offset ){
if( newOffset == -1 ){
storeLastErrno((unixFile*)id, errno);
}else{
storeLastErrno((unixFile*)id, 0);
}
return -1;
}
got = osRead(id->h, pBuf, cnt);
#endif
if( got==cnt ) break;
if( got<0 ){
if( errno==EINTR ){ got = 1; continue; }
................................................................................
int nBuf, /* Size of buffer pBuf in bytes */
int *piErrno /* OUT: Error number if error occurs */
){
int rc = 0; /* Value returned by system call */
assert( nBuf==(nBuf&0x1ffff) );
assert( fd>2 );
nBuf &= 0x1ffff;
TIMER_START;
#if defined(USE_PREAD)
do{ rc = (int)osPwrite(fd, pBuf, nBuf, iOff); }while( rc<0 && errno==EINTR );
#elif defined(USE_PREAD64)
do{ rc = (int)osPwrite64(fd, pBuf, nBuf, iOff);}while( rc<0 && errno==EINTR);
#else
do{
i64 iSeek = lseek(fd, iOff, SEEK_SET);
SimulateIOError( iSeek-- );
if( iSeek!=iOff ){
if( piErrno ) *piErrno = (iSeek==-1 ? errno : 0);
return -1;
}
rc = osWrite(fd, pBuf, nBuf);
}while( rc<0 && errno==EINTR );
#endif
TIMER_END;
OSTRACE(("WRITE %-3d %5d %7lld %llu\n", fd, rc, iOff, TIMER_ELAPSED));
if( rc<0 && piErrno ) *piErrno = errno;
return rc;
}
/*
** Seek to the offset in id->offset then read cnt bytes into pBuf.
** Return the number of bytes actually read. Update the offset.
................................................................................
else{
static const int pgsz = 4096;
int iPg;
/* Write to the last byte of each newly allocated or extended page */
assert( (nByte % pgsz)==0 );
for(iPg=(sStat.st_size/pgsz); iPg<(nByte/pgsz); iPg++){
if( seekAndWriteFd(pShmNode->h, iPg*pgsz + pgsz-1, "", 1, 0)!=1 ){
const char *zFile = pShmNode->zFilename;
rc = unixLogError(SQLITE_IOERR_SHMSIZE, "write", zFile);
goto shmpage_out;
}
}
}
}
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got = osPread(id->h, pBuf, cnt, offset);
SimulateIOError( got = -1 );
#elif defined(USE_PREAD64)
got = osPread64(id->h, pBuf, cnt, offset);
SimulateIOError( got = -1 );
#else
newOffset = lseek(id->h, offset, SEEK_SET);
SimulateIOError( newOffset = -1 );
if( newOffset<0 ){
storeLastErrno((unixFile*)id, errno);
return -1;
}
got = osRead(id->h, pBuf, cnt);
#endif
if( got==cnt ) break;
if( got<0 ){
if( errno==EINTR ){ got = 1; continue; }
................................................................................
int nBuf, /* Size of buffer pBuf in bytes */
int *piErrno /* OUT: Error number if error occurs */
){
int rc = 0; /* Value returned by system call */
assert( nBuf==(nBuf&0x1ffff) );
assert( fd>2 );
assert( piErrno!=0 );
nBuf &= 0x1ffff;
TIMER_START;
#if defined(USE_PREAD)
do{ rc = (int)osPwrite(fd, pBuf, nBuf, iOff); }while( rc<0 && errno==EINTR );
#elif defined(USE_PREAD64)
do{ rc = (int)osPwrite64(fd, pBuf, nBuf, iOff);}while( rc<0 && errno==EINTR);
#else
do{
i64 iSeek = lseek(fd, iOff, SEEK_SET);
SimulateIOError( iSeek = -1 );
if( iSeek<0 ){
rc = -1;
break;
}
rc = osWrite(fd, pBuf, nBuf);
}while( rc<0 && errno==EINTR );
#endif
TIMER_END;
OSTRACE(("WRITE %-3d %5d %7lld %llu\n", fd, rc, iOff, TIMER_ELAPSED));
if( rc<0 ) *piErrno = errno;
return rc;
}
/*
** Seek to the offset in id->offset then read cnt bytes into pBuf.
** Return the number of bytes actually read. Update the offset.
................................................................................
else{
static const int pgsz = 4096;
int iPg;
/* Write to the last byte of each newly allocated or extended page */
assert( (nByte % pgsz)==0 );
for(iPg=(sStat.st_size/pgsz); iPg<(nByte/pgsz); iPg++){
int x = 0;
if( seekAndWriteFd(pShmNode->h, iPg*pgsz + pgsz-1, "", 1, &x)!=1 ){
const char *zFile = pShmNode->zFilename;
rc = unixLogError(SQLITE_IOERR_SHMSIZE, "write", zFile);
goto shmpage_out;
}
}
}
}
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