Mercurial > gnulib
view lib/canonicalize.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 |
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/* Return the canonical absolute name of a given file. Copyright (C) 1996-2007, 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/>. */ #ifndef CANONICALIZE_H_ # define CANONICALIZE_H_ #include <stdlib.h> /* for canonicalize_file_name */ #define CAN_MODE_MASK (CAN_EXISTING | CAN_ALL_BUT_LAST | CAN_MISSING) enum canonicalize_mode_t { /* All components must exist. */ CAN_EXISTING = 0, /* All components excluding last one must exist. */ CAN_ALL_BUT_LAST = 1, /* No requirements on components existence. */ CAN_MISSING = 2, /* Don't expand symlinks. */ CAN_NOLINKS = 4 }; typedef enum canonicalize_mode_t canonicalize_mode_t; /* Return the canonical absolute name of file NAME, while treating missing elements according to CAN_MODE. A canonical name does not contain any `.', `..' components nor any repeated file name separators ('/') or, depending on other CAN_MODE flags, symlinks. Whether components must exist or not depends on canonicalize mode. The result is malloc'd. */ char *canonicalize_filename_mode (const char *, canonicalize_mode_t); #endif /* !CANONICALIZE_H_ */