Mercurial > gnulib
view lib/xgetdomainname.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 |
line wrap: on
line source
/* xgetdomainname.c -- Return the NIS domain name, without size limitations. Copyright (C) 1992, 1996, 2000-2001, 2003-2004, 2006, 2008-2013 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/>. */ /* Based on xgethostname.c, written by Jim Meyering. */ #include <config.h> /* Specification. */ #include "xgetdomainname.h" /* Get getdomainname. */ #include <unistd.h> /* Get errno. */ #include <errno.h> /* Get free. */ #include <stdlib.h> #include "xalloc.h" #ifndef INITIAL_DOMAINNAME_LENGTH # define INITIAL_DOMAINNAME_LENGTH 34 #endif /* Return the NIS domain name of the machine, in malloc'd storage. WARNING! The NIS domain name is unrelated to the fully qualified host name of the machine. It is also unrelated to email addresses. WARNING! The NIS domain name is usually the empty string or "(none)" when not using NIS. If malloc fails, exit. Upon any other failure, set errno and return NULL. */ char * xgetdomainname (void) { char *domainname; size_t size; size = INITIAL_DOMAINNAME_LENGTH; domainname = xmalloc (size); while (1) { int k = size - 1; int err; errno = 0; domainname[k] = '\0'; err = getdomainname (domainname, size); if (err >= 0 && domainname[k] == '\0') break; else if (err < 0 && errno != EINVAL) { int saved_errno = errno; free (domainname); errno = saved_errno; return NULL; } size *= 2; domainname = xrealloc (domainname, size); } return domainname; }