Mercurial > gnulib
view lib/backupfile.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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/* backupfile.h -- declarations for making Emacs style backup file names Copyright (C) 1990-1992, 1997-1999, 2003-2004, 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 BACKUPFILE_H_ # define BACKUPFILE_H_ # ifdef __cplusplus extern "C" { # endif /* When to make backup files. */ enum backup_type { /* Never make backups. */ no_backups, /* Make simple backups of every file. */ simple_backups, /* Make numbered backups of files that already have numbered backups, and simple backups of the others. */ numbered_existing_backups, /* Make numbered backups of every file. */ numbered_backups }; # define VALID_BACKUP_TYPE(Type) \ ((unsigned int) (Type) <= numbered_backups) extern char const *simple_backup_suffix; char *find_backup_file_name (char const *, enum backup_type); enum backup_type get_version (char const *context, char const *arg); enum backup_type xget_version (char const *context, char const *arg); void addext (char *, char const *, int); # ifdef __cplusplus } # endif #endif /* ! BACKUPFILE_H_ */