Mercurial > gnulib
view lib/closedir.c @ 37246:5cfb3a67238d
regex: avoid glibc deadlock during configure
glibc has a known bug where certain corruptions of the heap can
cause malloc to default to printing a debug message that includes
a backtrace, but the act of getting the backtrace uses dlopen
which in turn calls into malloc, causing a recursive lock ending
in deadlock. Thus, when configure is probing for a known glibc
heap corruption bug, the overall configure would hang.
The solution suggested by glibc developers is to force malloc
to quit printing debug messages, which avoids recursive malloc.
* m4/regex.m4 (gl_REGEX): Avoid recursive malloc deadlock when
glibc bug 15078 in turn triggers bug 16159.
Reported by Michal Privoznik.
Signed-off-by: Eric Blake <eblake@redhat.com>
author | Eric Blake <eblake@redhat.com> |
---|---|
date | Tue, 03 Dec 2013 10:34:13 -0700 |
parents | c741bc27922a |
children | 344018b6e5d7 |
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/* Stop reading the entries of a directory. Copyright (C) 2006-2013 Free Software Foundation, Inc. This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see <http://www.gnu.org/licenses/>. */ #include <config.h> /* Specification. */ #include <dirent.h> #if REPLACE_FCHDIR # include <unistd.h> #endif #if HAVE_CLOSEDIR /* Override closedir(), to keep track of the open file descriptors. Needed because there is a function dirfd(). */ #else # include <stdlib.h> # include "dirent-private.h" #endif int closedir (DIR *dirp) { # if REPLACE_FCHDIR int fd = dirfd (dirp); # endif int retval; #if HAVE_CLOSEDIR # undef closedir retval = closedir (dirp); #else if (dirp->current != INVALID_HANDLE_VALUE) FindClose (dirp->current); free (dirp); retval = 0; #endif #if REPLACE_FCHDIR if (retval >= 0) _gl_unregister_fd (fd); #endif return retval; }