view modules/fnmatch @ 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 3cbb6b1d4cc3
children 4434607ac1ce
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Description:
fnmatch() function: wildcard matching.

Files:
lib/fnmatch.in.h
lib/fnmatch.c
lib/fnmatch_loop.c
m4/mbstate_t.m4
m4/fnmatch.m4

Depends-on:
extensions
snippet/arg-nonnull
alloca          [test -n "$FNMATCH_H"]
stdbool         [test -n "$FNMATCH_H"]
wchar           [test -n "$FNMATCH_H"]
wctype-h        [test -n "$FNMATCH_H"]
memchr          [test -n "$FNMATCH_H"]
memcmp          [test -n "$FNMATCH_H"]
mbsrtowcs       [test -n "$FNMATCH_H"]
mbsinit         [test -n "$FNMATCH_H"]

configure.ac:
gl_FUNC_FNMATCH_POSIX
if test -n "$FNMATCH_H"; then
  AC_LIBOBJ([fnmatch])
  gl_PREREQ_FNMATCH
fi

Makefile.am:
BUILT_SOURCES += $(FNMATCH_H)

# We need the following in order to create <fnmatch.h> when the system
# doesn't have one that supports the required API.
if GL_GENERATE_FNMATCH_H
fnmatch.h: fnmatch.in.h $(top_builddir)/config.status $(ARG_NONNULL_H)
	$(AM_V_GEN)rm -f $@-t $@ && \
	{ echo '/* DO NOT EDIT! GENERATED AUTOMATICALLY! */'; \
	  sed -e '/definition of _GL_ARG_NONNULL/r $(ARG_NONNULL_H)' \
	      < $(srcdir)/fnmatch.in.h; \
	} > $@-t && \
	mv -f $@-t $@
else
fnmatch.h: $(top_builddir)/config.status
	rm -f $@
endif
MOSTLYCLEANFILES += fnmatch.h fnmatch.h-t

Include:
<fnmatch.h>

License:
LGPLv2+

Maintainer:
all, glibc