view lib/freadable.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
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/* Retrieve information about a FILE stream.
   Copyright (C) 2007, 2009-2013 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 <stdbool.h>
#include <stdio.h>

/* Return true if the stream STREAM supports reading, false if it supports
   only writing, i.e. if it was opened write-only or append-only.
   STREAM must not be wide-character oriented.
   The result doesn't change until the stream is closed or re-opened.  */

#if HAVE___FREADABLE /* glibc >= 2.2, Solaris >= 7, musl libc */

# include <stdio_ext.h>
# define freadable(stream) (__freadable (stream) != 0)

#else

# ifdef __cplusplus
extern "C" {
# endif

extern bool freadable (FILE *stream);

# ifdef __cplusplus
}
# endif

#endif