Mercurial > gnulib
view lib/freadahead.h @ 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 |
line wrap: on
line source
/* Retrieve information about a FILE stream. Copyright (C) 2007-2013 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 <stddef.h> #include <stdio.h> /* Assuming the stream STREAM is open for reading: Return the number of bytes waiting in the input buffer of STREAM. This includes both the bytes that have been read from the underlying input source and the bytes that have been pushed back through 'ungetc'. If this number is 0 and the stream is not currently writing, fflush (STREAM) is known to be a no-op. STREAM must not be wide-character oriented. */ #if HAVE___FREADAHEAD /* musl libc */ # include <stdio_ext.h> # define freadahead(stream) __freadahead (stream) #else # ifdef __cplusplus extern "C" { # endif extern size_t freadahead (FILE *stream) _GL_ATTRIBUTE_PURE; # ifdef __cplusplus } # endif #endif