Mercurial > gnulib
view lib/sh-quote.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
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/* Shell quoting. Copyright (C) 2001-2004, 2006, 2009-2013 Free Software Foundation, Inc. Written by Bruno Haible <haible@clisp.cons.org>, 2001. 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 <config.h> /* Specification. */ #include "sh-quote.h" #include <string.h> #include "quotearg.h" #include "xalloc.h" /* Describes quoting for sh compatible shells. */ static struct quoting_options *sh_quoting_options; /* Initializes the sh_quoting_options variable. */ static void init_sh_quoting_options () { sh_quoting_options = clone_quoting_options (NULL); set_quoting_style (sh_quoting_options, shell_quoting_style); } /* Returns the number of bytes needed for the quoted string. */ size_t shell_quote_length (const char *string) { if (sh_quoting_options == NULL) init_sh_quoting_options (); return quotearg_buffer (NULL, 0, string, strlen (string), sh_quoting_options); } /* Copies the quoted string to p and returns the incremented p. There must be room for shell_quote_length (string) + 1 bytes at p. */ char * shell_quote_copy (char *p, const char *string) { if (sh_quoting_options == NULL) init_sh_quoting_options (); return p + quotearg_buffer (p, (size_t)(-1), string, strlen (string), sh_quoting_options); } /* Returns the freshly allocated quoted string. */ char * shell_quote (const char *string) { if (sh_quoting_options == NULL) init_sh_quoting_options (); return quotearg_alloc (string, strlen (string), sh_quoting_options); } /* Returns a freshly allocated string containing all argument strings, quoted, separated through spaces. */ char * shell_quote_argv (char * const *argv) { if (*argv != NULL) { char * const *argp; size_t length; char *command; char *p; length = 0; for (argp = argv; ; ) { length += shell_quote_length (*argp) + 1; argp++; if (*argp == NULL) break; } command = XNMALLOC (length, char); p = command; for (argp = argv; ; ) { p = shell_quote_copy (p, *argp); argp++; if (*argp == NULL) break; *p++ = ' '; } *p = '\0'; return command; } else return xstrdup (""); }