view modules/readlinkat @ 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 3695e5e02762
children 05d77e098e6e
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Description:
readlinkat() function: read symlinks relative to a directory

Files:
lib/readlinkat.c
lib/at-func.c
m4/readlinkat.m4

Depends-on:
unistd
extensions
at-internal     [test $HAVE_READLINKAT = 0]
dosname         [test $HAVE_READLINKAT = 0]
errno           [test $HAVE_READLINKAT = 0]
fchdir          [test $HAVE_READLINKAT = 0]
fcntl-h         [test $HAVE_READLINKAT = 0]
openat-die      [test $HAVE_READLINKAT = 0]
openat-h        [test $HAVE_READLINKAT = 0]
save-cwd        [test $HAVE_READLINKAT = 0]
readlink        [test $HAVE_READLINKAT = 0]

configure.ac:
gl_FUNC_READLINKAT
if test $HAVE_READLINKAT = 0; then
  AC_LIBOBJ([readlinkat])
fi
gl_UNISTD_MODULE_INDICATOR([readlinkat])

Makefile.am:

Include:
<fcntl.h>
<unistd.h>

License:
GPL

Maintainer:
Jim Meyering, Eric Blake