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Overview
| Comment: | Fix the build for cases when pread()/pwrite() are not available. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | pread |
| Files: | files | file ages | folders |
| SHA1: | 7d67d876b70c7a4199697c5b112d809c |
| User & Date: | drh 2016-03-04 03:02:06 |
Context
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2016-03-04
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| 03:14 | Further fixes to the pread()/pwrite() enabling logic. Closed-Leaf check-in: 38fb54e7 user: drh tags: pread | |
| 03:02 | Fix the build for cases when pread()/pwrite() are not available. check-in: 7d67d876 user: drh tags: pread | |
| 02:38 | Update the configure script to detect pread/pwrite and update os_unix.c to use those routines if they are available. check-in: 2cffb9e5 user: drh tags: pread | |
Changes
Changes to src/os_unix.c.
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#elif defined(HAVE_PREAD) && defined(HAVE_PWRITE) # undef USE_PREAD # undef USE_PWRITE # define USE_PREAD64 1 # define USE_PWRITE64 1 #endif /* ** standard include files. */ #include <sys/types.h> #include <sys/stat.h> #include <fcntl.h> #include <unistd.h> ................................................................................ unsigned short int ctrlFlags; /* Behavioral bits. UNIXFILE_* flags */ int lastErrno; /* The unix errno from last I/O error */ void *lockingContext; /* Locking style specific state */ UnixUnusedFd *pUnused; /* Pre-allocated UnixUnusedFd */ const char *zPath; /* Name of the file */ unixShm *pShm; /* Shared memory segment information */ int szChunk; /* Configured by FCNTL_CHUNK_SIZE */ #if !defined(USE_PREAD) && !defined(USE_PREAD64) off64_t iOfst; /* Current offset */ #endif #if SQLITE_MAX_MMAP_SIZE>0 int nFetchOut; /* Number of outstanding xFetch refs */ sqlite3_int64 mmapSize; /* Usable size of mapping at pMapRegion */ sqlite3_int64 mmapSizeActual; /* Actual size of mapping at pMapRegion */ sqlite3_int64 mmapSizeMax; /* Configured FCNTL_MMAP_SIZE value */ void *pMapRegion; /* Memory mapped region */ #endif ................................................................................ ** ** To avoid stomping the errno value on a failed read the lastErrno value ** is set before returning. */ static int seekAndRead(unixFile *id, sqlite3_int64 offset, void *pBuf, int cnt){ int got; int prior = 0; TIMER_START; assert( cnt==(cnt&0x1ffff) ); assert( id->h>2 ); do{ #if defined(USE_PREAD) 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 if( offset!=id->iOfst ){ id->iOfst = lseek(id->h, offset, SEEK_SET); SimulateIOError( id->iOfst = -1 ); if( id->iOfst<0 ){ storeLastErrno((unixFile*)id, errno); return -1; } got = osRead(id->h, pBuf, cnt); if( got>=0 ) id->iOfst += got; #endif if( got==cnt ) break; if( got<0 ){ if( errno==EINTR ){ got = 1; continue; } prior = 0; storeLastErrno((unixFile*)id, errno); break; ................................................................................ #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{ if( iOff!=fd i64 iSeek = lseek(fd, iOff, SEEK_SET); SimulateIOError( iSeek = -1 ); if( iSeek<0 ){ rc = -1; break; } rc = osWrite(fd, pBuf, nBuf); |
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#elif defined(HAVE_PREAD) && defined(HAVE_PWRITE) # undef USE_PREAD # undef USE_PWRITE # define USE_PREAD64 1 # define USE_PWRITE64 1 #endif /* ** standard include files. */ #include <sys/types.h> #include <sys/stat.h> #include <fcntl.h> #include <unistd.h> ................................................................................ unsigned short int ctrlFlags; /* Behavioral bits. UNIXFILE_* flags */ int lastErrno; /* The unix errno from last I/O error */ void *lockingContext; /* Locking style specific state */ UnixUnusedFd *pUnused; /* Pre-allocated UnixUnusedFd */ const char *zPath; /* Name of the file */ unixShm *pShm; /* Shared memory segment information */ int szChunk; /* Configured by FCNTL_CHUNK_SIZE */ #if SQLITE_MAX_MMAP_SIZE>0 int nFetchOut; /* Number of outstanding xFetch refs */ sqlite3_int64 mmapSize; /* Usable size of mapping at pMapRegion */ sqlite3_int64 mmapSizeActual; /* Actual size of mapping at pMapRegion */ sqlite3_int64 mmapSizeMax; /* Configured FCNTL_MMAP_SIZE value */ void *pMapRegion; /* Memory mapped region */ #endif ................................................................................ ** ** To avoid stomping the errno value on a failed read the lastErrno value ** is set before returning. */ static int seekAndRead(unixFile *id, sqlite3_int64 offset, void *pBuf, int cnt){ int got; int prior = 0; #if (!defined(USE_PREAD) && !defined(USE_PREAD64)) i64 newOffset; #endif TIMER_START; assert( cnt==(cnt&0x1ffff) ); assert( id->h>2 ); do{ #if defined(USE_PREAD) 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; } prior = 0; storeLastErrno((unixFile*)id, errno); break; ................................................................................ #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); |