d/freebsd-dev
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Disallow fseek() optimization in internal read buffer, if pointer is moved by

Browse Source 
seek. It means that beginning of read buffer becomes not the same as current
file position.
This commit is contained in:
Andrey A. Chernov 2001-10-23 22:48:00 +00:00
parent 9965784733
commit 751fc77994
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=85391
1 changed files with 5 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
lib/libc/stdio/stdio.c
View File

@ -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