view modules/openat @ 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 f3bc58f169b7
children 637f3a63efbd
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Description:
openat() function: Open a file at a directory.

Files:
lib/openat.c
m4/openat.m4
m4/lstat.m4
m4/mode_t.m4

Depends-on:
fcntl-h
extensions
largefile
openat-h        [test $HAVE_OPENAT = 0 || test $REPLACE_OPENAT = 1]
stdbool         [test $HAVE_OPENAT = 0 || test $REPLACE_OPENAT = 1]
sys_stat        [test $HAVE_OPENAT = 0 || test $REPLACE_OPENAT = 1]
fstat           [test $REPLACE_OPENAT = 1]
at-internal     [test $HAVE_OPENAT = 0]
dosname         [test $HAVE_OPENAT = 0]
errno           [test $HAVE_OPENAT = 0]
fchdir          [test $HAVE_OPENAT = 0]
open            [test $HAVE_OPENAT = 0]
openat-die      [test $HAVE_OPENAT = 0]
save-cwd        [test $HAVE_OPENAT = 0]

configure.ac:
gl_FUNC_OPENAT
if test $HAVE_OPENAT = 0 || test $REPLACE_OPENAT = 1; then
  AC_LIBOBJ([openat])
  gl_PREREQ_OPENAT
fi
gl_MODULE_INDICATOR([openat]) dnl for lib/getcwd.c
gl_FCNTL_MODULE_INDICATOR([openat])

Makefile.am:

Include:
<fcntl.h>

License:
GPL

Maintainer:
Jim Meyering, Eric Blake