f8cdaf0c12
* lib/Makefile.am lib/alloca.in.h lib/argp-ba.c lib/argp-eexst.c lib/argp-fmtstream.c lib/argp-fmtstream.h lib/argp-fs-xinl.c lib/argp-help.c lib/argp-namefrob.h lib/argp-parse.c lib/argp-pin.c lib/argp-pv.c lib/argp-pvh.c lib/argp-xinl.c lib/argp.h lib/asnprintf.c lib/basename-lgpl.c lib/dirname-lgpl.c lib/dirname.h lib/dosname.h lib/errno.in.h lib/error.c lib/error.h lib/fcntl.in.h lib/float+.h lib/float.c lib/float.in.h lib/gethrxtime.c lib/gethrxtime.h lib/getopt.c lib/getopt.in.h lib/getopt1.c lib/getopt_int.h lib/gettext.h lib/gettime.c lib/gettimeofday.c lib/intprops.h lib/itold.c lib/lstat.c lib/malloc.c lib/memchr.c lib/mempcpy.c lib/mkstemp.c lib/msvc-inval.c lib/msvc-inval.h lib/msvc-nothrow.c lib/msvc-nothrow.h lib/pathmax.h lib/printf-args.c lib/printf-args.h lib/printf-parse.c lib/printf-parse.h lib/progname.c lib/progname.h lib/rawmemchr.c lib/size_max.h lib/sleep.c lib/stat.c lib/stdalign.in.h lib/stdbool.in.h lib/stddef.in.h lib/stdint.in.h lib/stdio.in.h lib/stdlib.in.h lib/strcasecmp.c lib/strchrnul.c lib/strerror-override.c lib/strerror-override.h lib/strerror.c lib/string.in.h lib/strings.in.h lib/stripslash.c lib/strncasecmp.c lib/strndup.c lib/strnlen.c lib/sys_stat.in.h lib/sys_time.in.h lib/sys_types.in.h lib/sys_wait.in.h lib/sysexits.in.h lib/tempname.c lib/tempname.h lib/time.in.h lib/timespec.h lib/unistd.in.h lib/vasnprintf.c lib/vasnprintf.h lib/verify.h lib/vsnprintf.c lib/wchar.in.h lib/xsize.h lib/xtime.h m4/00gnulib.m4 m4/alloca.m4 m4/argp.m4 m4/clock_time.m4 m4/dirname.m4 m4/double-slash-root.m4 m4/errno_h.m4 m4/error.m4 m4/exponentd.m4 m4/extensions.m4 m4/extern-inline.m4 m4/fcntl-o.m4 m4/fcntl_h.m4 m4/float_h.m4 m4/gethrxtime.m4 m4/getopt.m4 m4/gettime.m4 m4/gettimeofday.m4 m4/gnulib-cache.m4 m4/gnulib-common.m4 m4/gnulib-comp.m4 m4/gnulib-tool.m4 m4/include_next.m4 m4/intmax_t.m4 m4/inttypes_h.m4 m4/largefile.m4 m4/longlong.m4 m4/lstat.m4 m4/malloc.m4 m4/math_h.m4 m4/memchr.m4 m4/mempcpy.m4 m4/mkstemp.m4 m4/mmap-anon.m4 m4/msvc-inval.m4 m4/msvc-nothrow.m4 m4/multiarch.m4 m4/nocrash.m4 m4/off_t.m4 m4/pathmax.m4 m4/printf.m4 m4/rawmemchr.m4 m4/size_max.m4 m4/sleep.m4 m4/ssize_t.m4 m4/stat.m4 m4/stdalign.m4 m4/stdbool.m4 m4/stddef_h.m4 m4/stdint.m4 m4/stdint_h.m4 m4/stdio_h.m4 m4/stdlib_h.m4 m4/strcase.m4 m4/strchrnul.m4 m4/strerror.m4 m4/string_h.m4 m4/strings_h.m4 m4/strndup.m4 m4/strnlen.m4 m4/sys_socket_h.m4 m4/sys_stat_h.m4 m4/sys_time_h.m4 m4/sys_types_h.m4 m4/sys_wait_h.m4 m4/sysexits.m4 m4/tempname.m4 m4/time_h.m4 m4/timespec.m4 m4/unistd_h.m4 m4/vasnprintf.m4 m4/vsnprintf.m4 m4/warn-on-use.m4 m4/wchar_h.m4 m4/wchar_t.m4 m4/wint_t.m4 m4/xsize.m4 tools/snippet/arg-nonnull.h tools/snippet/c++defs.h tools/snippet/warn-on-use.h: Upgrade to gnulib 9ceceed274f83094127f9ff0bf061293c9fe1e7f. * m4/secure_getenv.m4, lib/secure_getenv.c, lib/unistd.c, lib/xtime.c: New files. * src/bin/Makefile.am: Link with the libtool library.
88 lines
2.7 KiB
Text
88 lines
2.7 KiB
Text
# memchr.m4 serial 12
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dnl Copyright (C) 2002-2004, 2009-2013 Free Software Foundation, Inc.
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dnl This file is free software; the Free Software Foundation
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dnl gives unlimited permission to copy and/or distribute it,
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dnl with or without modifications, as long as this notice is preserved.
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AC_DEFUN_ONCE([gl_FUNC_MEMCHR],
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[
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dnl Check for prerequisites for memory fence checks.
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gl_FUNC_MMAP_ANON
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AC_CHECK_HEADERS_ONCE([sys/mman.h])
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AC_CHECK_FUNCS_ONCE([mprotect])
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AC_REQUIRE([gl_HEADER_STRING_H_DEFAULTS])
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m4_ifdef([gl_FUNC_MEMCHR_OBSOLETE], [
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dnl These days, we assume memchr is present. But if support for old
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dnl platforms is desired:
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AC_CHECK_FUNCS_ONCE([memchr])
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if test $ac_cv_func_memchr = no; then
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HAVE_MEMCHR=0
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fi
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])
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if test $HAVE_MEMCHR = 1; then
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# Detect platform-specific bugs in some versions of glibc:
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# memchr should not dereference anything with length 0
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# http://bugzilla.redhat.com/499689
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# memchr should not dereference overestimated length after a match
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# http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=521737
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# http://sourceware.org/bugzilla/show_bug.cgi?id=10162
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# Assume that memchr works on platforms that lack mprotect.
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AC_CACHE_CHECK([whether memchr works], [gl_cv_func_memchr_works],
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[AC_RUN_IFELSE([AC_LANG_PROGRAM([[
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#include <string.h>
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#if HAVE_SYS_MMAN_H
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# include <fcntl.h>
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# include <unistd.h>
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# include <sys/types.h>
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# include <sys/mman.h>
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# ifndef MAP_FILE
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# define MAP_FILE 0
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# endif
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#endif
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]], [[
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int result = 0;
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char *fence = NULL;
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#if HAVE_SYS_MMAN_H && HAVE_MPROTECT
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# if HAVE_MAP_ANONYMOUS
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const int flags = MAP_ANONYMOUS | MAP_PRIVATE;
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const int fd = -1;
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# else /* !HAVE_MAP_ANONYMOUS */
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const int flags = MAP_FILE | MAP_PRIVATE;
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int fd = open ("/dev/zero", O_RDONLY, 0666);
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if (fd >= 0)
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# endif
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{
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int pagesize = getpagesize ();
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char *two_pages =
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(char *) mmap (NULL, 2 * pagesize, PROT_READ | PROT_WRITE,
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flags, fd, 0);
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if (two_pages != (char *)(-1)
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&& mprotect (two_pages + pagesize, pagesize, PROT_NONE) == 0)
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fence = two_pages + pagesize;
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}
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#endif
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if (fence)
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{
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if (memchr (fence, 0, 0))
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result |= 1;
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strcpy (fence - 9, "12345678");
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if (memchr (fence - 9, 0, 79) != fence - 1)
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result |= 2;
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if (memchr (fence - 1, 0, 3) != fence - 1)
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result |= 4;
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}
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return result;
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]])], [gl_cv_func_memchr_works=yes], [gl_cv_func_memchr_works=no],
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[dnl Be pessimistic for now.
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gl_cv_func_memchr_works="guessing no"])])
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if test "$gl_cv_func_memchr_works" != yes; then
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REPLACE_MEMCHR=1
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fi
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fi
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])
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# Prerequisites of lib/memchr.c.
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AC_DEFUN([gl_PREREQ_MEMCHR], [
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AC_CHECK_HEADERS([bp-sym.h])
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])
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