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| author | ache <ache@FreeBSD.org> | 2001-10-23 22:48:00 +0000 |
|---|---|---|
| committer | ache <ache@FreeBSD.org> | 2001-10-23 22:48:00 +0000 |
| commit | 76a4ffc8e57b6461dfa6afd46f84d7dd9328ffb7 (patch) | |
| tree | 30016a89c87946740b5bc95f59bf9ed664cccc5a /lib/libc/stdio/stdio.c | |
| parent | f9e1c31e422586b2016a064037860942077293ab (diff) | |
| download | FreeBSD-src-76a4ffc8e57b6461dfa6afd46f84d7dd9328ffb7.zip FreeBSD-src-76a4ffc8e57b6461dfa6afd46f84d7dd9328ffb7.tar.gz | |
Disallow fseek() optimization in internal read buffer, if pointer is moved by
seek. It means that beginning of read buffer becomes not the same as current
file position.
Diffstat (limited to 'lib/libc/stdio/stdio.c')
| -rw-r--r-- | lib/libc/stdio/stdio.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/lib/libc/stdio/stdio.c b/lib/libc/stdio/stdio.c index 4bee608..c0860eb 100644 --- a/lib/libc/stdio/stdio.c +++ b/lib/libc/stdio/stdio.c @@ -164,6 +164,11 @@ _sseek(fp, offset, whence) errret = errno; if (errno == 0) errno = serrno; + + if (errret == 0 && (offset != 0 || whence != SEEK_CUR)) + /* Disallow fseek() optimization inside read buffer */ + fp->_flags |= __SMOD; + /* * Disallow negative seeks per POSIX. * It is needed here to help upper level caller |
