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Never leave an open file descriptor pointing into the middle of the

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database file if the file descriptor number is 2 or less.

FossilOrigin-Name: 3426673e4659eb68dbd14a3e41d4620d748432db
This commit is contained in:
drh
2013-08-29 21:26:26 +00:00
parent 8bff07a55f
commit 0c9a8e345e
3 changed files with 14 additions and 8 deletions
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3
src/os_unix.c
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@@ -588,6 +588,7 @@ static int robust_open(const char *z, int f, mode_t m){
osFchmod(fd, m);
}
}
if( fd<=2 ) lseek(fd, 0, SEEK_END);
#if defined(FD_CLOEXEC) && (!defined(O_CLOEXEC) || O_CLOEXEC==0)
osFcntl(fd, F_SETFD, osFcntl(fd, F_GETFD, 0) | FD_CLOEXEC);
#endif
@@ -3133,6 +3134,7 @@ static int seekAndRead(unixFile *id, sqlite3_int64 offset, void *pBuf, int cnt){
pBuf = (void*)(got + (char*)pBuf);
}
}while( got>0 );
if( id->h<=2 ) lseek(id->h, 0, SEEK_END);
TIMER_END;
OSTRACE(("READ %-3d %5d %7lld %llu\n",
id->h, got+prior, offset-prior, TIMER_ELAPSED));
@@ -3232,6 +3234,7 @@ static int seekAndWriteFd(
rc = osWrite(fd, pBuf, nBuf);
}while( rc<0 && errno==EINTR );
#endif
if( fd<=2 ) lseek(fd, 0, SEEK_END);
TIMER_END;
OSTRACE(("WRITE %-3d %5d %7lld %llu\n", fd, rc, iOff, TIMER_ELAPSED));