Mercurial > gnulib
view lib/anytostr.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 | 689fbedb3dd5 |
children | 344018b6e5d7 |
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/* anytostr.c -- convert integers to printable strings Copyright (C) 2001, 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/>. */ /* Written by Paul Eggert */ /* Tell gcc not to warn about the (i < 0) test, below. */ #if (__GNUC__ == 4 && 3 <= __GNUC_MINOR__) || 4 < __GNUC__ # pragma GCC diagnostic ignored "-Wtype-limits" #elif defined __clang__ # pragma clang diagnostic ignored "-Wtautological-compare" #endif #include <config.h> #include "inttostr.h" /* Convert I to a printable string in BUF, which must be at least INT_BUFSIZE_BOUND (INTTYPE) bytes long. Return the address of the printable string, which need not start at BUF. */ char * __attribute_warn_unused_result__ anytostr (inttype i, char *buf) { char *p = buf + INT_STRLEN_BOUND (inttype); *p = 0; if (i < 0) { do *--p = '0' - i % 10; while ((i /= 10) != 0); *--p = '-'; } else { do *--p = '0' + i % 10; while ((i /= 10) != 0); } return p; }