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Fixes to os_unix.c to support database (and other) files larger than 2GiB.

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FossilOrigin-Name: e7fae33c0754488336ce093189a83dfe1b818d89
This commit is contained in:
dan
2014-09-06 16:49:40 +00:00
parent 30c633a097
commit 2ee5341288
3 changed files with 33 additions and 9 deletions
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23
src/os_unix.c
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@@ -299,6 +299,14 @@ static int randomnessPid = 0;
# endif
#endif
/*
** Explicitly call the 64-bit version of lseek() on Android. Otherwise, lseek()
** is the 32-bit version, even if _FILE_OFFSET_BITS=64 is defined.
*/
#ifdef __ANDROID__
# define lseek lseek64
#endif
/*
** Different Unix systems declare open() in different ways. Same use
** open(const char*,int,mode_t). Others use open(const char*,int,...).
@@ -708,9 +716,22 @@ static int lockTrace(int fd, int op, struct flock *p){
/*
** Retry ftruncate() calls that fail due to EINTR
**
** All calls to ftruncate() within this file should be made through this wrapper.
** On the Android platform, bypassing the logic below could lead to a corrupt
** database.
*/
static int robust_ftruncate(int h, sqlite3_int64 sz){
int rc;
#ifdef __ANDROID__
/* On Android, ftruncate() always uses 32-bit offsets, even if
** _FILE_OFFSET_BITS=64 is defined. This means it is unsafe to attempt to
** truncate a file to any size smaller than 2GiB. Silently ignore any
** such attempts. */
if( sz>(sqlite3_int64)0x7FFFFFFF ){
rc = SQLITE_OK;
}else
#endif
do{ rc = osFtruncate(h,sz); }while( rc<0 && errno==EINTR );
return rc;
}
@@ -3595,7 +3616,7 @@ static int unixTruncate(sqlite3_file *id, i64 nByte){
nByte = ((nByte + pFile->szChunk - 1)/pFile->szChunk) * pFile->szChunk;
}
rc = robust_ftruncate(pFile->h, (off_t)nByte);
rc = robust_ftruncate(pFile->h, nByte);
if( rc ){
pFile->lastErrno = errno;
return unixLogError(SQLITE_IOERR_TRUNCATE, "ftruncate", pFile->zPath);