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File fcntl-o.m4

# fcntl-o.m4 serial 4
dnl Copyright (C) 2006, 2009-2016 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.

dnl Written by Paul Eggert.

# Test whether the flags O_NOATIME and O_NOFOLLOW actually work.
# Define HAVE_WORKING_O_NOATIME to 1 if O_NOATIME works, or to 0 otherwise.
# Define HAVE_WORKING_O_NOFOLLOW to 1 if O_NOFOLLOW works, or to 0 otherwise.
AC_DEFUN([gl_FCNTL_O_FLAGS],
[
  dnl Persuade glibc <fcntl.h> to define O_NOATIME and O_NOFOLLOW.
  dnl AC_USE_SYSTEM_EXTENSIONS was introduced in autoconf 2.60 and obsoletes
  dnl AC_GNU_SOURCE.
  m4_ifdef([AC_USE_SYSTEM_EXTENSIONS],
    [AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])],
    [AC_REQUIRE([AC_GNU_SOURCE])])

AC_CHECK_HEADERS_ONCE([unistd.h])
  AC_CHECK_FUNCS_ONCE([symlink])
  AC_CACHE_CHECK([for working fcntl.h], [gl_cv_header_working_fcntl_h],
    [AC_RUN_IFELSE(
       [AC_LANG_PROGRAM(
          [[#include <sys/types.h>
           #include <sys/stat.h>
           #if HAVE_UNISTD_H
           # include <unistd.h>
           #else /* on Windows with MSVC */
           # include <io.h>
           # include <stdlib.h>
           # defined sleep(n) _sleep ((n) * 1000)
           #endif
           #include <fcntl.h>
           #ifndef O_NOATIME
            #define O_NOATIME 0
           #endif
           #ifndef O_NOFOLLOW
            #define O_NOFOLLOW 0
           #endif
           static int const constants[] =
            {
              O_CREAT, O_EXCL, O_NOCTTY, O_TRUNC, O_APPEND,
              O_NONBLOCK, O_SYNC, O_ACCMODE, O_RDONLY, O_RDWR, O_WRONLY
            };
          ]],
          [[
            int result = !constants;
            #if HAVE_SYMLINK
            {
              static char const sym[] = "conftest.sym";
              if (symlink ("/dev/null", sym) != 0)
                result |= 2;
              else
                {
                  int fd = open (sym, O_WRONLY | O_NOFOLLOW | O_CREAT, 0);
                  if (fd >= 0)
                    {
                      close (fd);
                      result |= 4;
                    }
                }
              if (unlink (sym) != 0 || symlink (".", sym) != 0)
                result |= 2;
              else
                {
                  int fd = open (sym, O_RDONLY | O_NOFOLLOW);
                  if (fd >= 0)
                    {
                      close (fd);
                      result |= 4;
                    }
                }
              unlink (sym);
            }
            #endif
            {
              static char const file[] = "confdefs.h";
              int fd = open (file, O_RDONLY | O_NOATIME);
              if (fd < 0)
                result |= 8;
              else
                {
                  struct stat st0;
                  if (fstat (fd, &st0) != 0)
                    result |= 16;
                  else
                    {
                      char c;
                      sleep (1);
                      if (read (fd, &c, 1) != 1)
                        result |= 24;
                      else
                        {
                          if (close (fd) != 0)
                            result |= 32;
                          else
                            {
                              struct stat st1;
                              if (stat (file, &st1) != 0)
                                result |= 40;
                              else
                                if (st0.st_atime != st1.st_atime)
                                  result |= 64;
                            }
                        }
                    }
                }
            }
            return result;]])],
       [gl_cv_header_working_fcntl_h=yes],
       [case $? in #(
        4) gl_cv_header_working_fcntl_h='no (bad O_NOFOLLOW)';; #(
        64) gl_cv_header_working_fcntl_h='no (bad O_NOATIME)';; #(
        68) gl_cv_header_working_fcntl_h='no (bad O_NOATIME, O_NOFOLLOW)';; #(
         *) gl_cv_header_working_fcntl_h='no';;
        esac],
       [gl_cv_header_working_fcntl_h=cross-compiling])])

case $gl_cv_header_working_fcntl_h in #(
  *O_NOATIME* | no | cross-compiling) ac_val=0;; #(
  *) ac_val=1;;
  esac
  AC_DEFINE_UNQUOTED([HAVE_WORKING_O_NOATIME], [$ac_val],
    [Define to 1 if O_NOATIME works.])

case $gl_cv_header_working_fcntl_h in #(
  *O_NOFOLLOW* | no | cross-compiling) ac_val=0;; #(
  *) ac_val=1;;
  esac
  AC_DEFINE_UNQUOTED([HAVE_WORKING_O_NOFOLLOW], [$ac_val],
    [Define to 1 if O_NOFOLLOW works.])
])

Name	Type	Size	Permission	Last Modified	Actions
.	DIR	-	drwxr-xr-x	2025-08-28 10:58:31
..	DIR	-	drwxr-xr-x	2025-10-16 10:59:21
bison-i18n.m4	text/x-m4	1.88 KB	-rw-r--r--	2019-10-12 12:28:39
codeset.m4	text/x-m4	842 B	-rw-r--r--	2016-03-20 07:37:53
extern-inline.m4	text/x-m4	4.27 KB	-rw-r--r--	2016-05-28 12:29:03
fcntl-o.m4	text/x-m4	4.56 KB	-rw-r--r--	2016-03-20 07:37:53
fontutil.m4	text/x-m4	13.83 KB	-rw-r--r--	2021-10-09 11:41:50
freetype2.m4	text/x-c	6.18 KB	-rw-r--r--	2018-04-22 09:41:36
gettext.m4	text/x-c	15.49 KB	-rw-r--r--	2016-05-28 12:29:03
glibc2.m4	text/x-c	830 B	-rw-r--r--	2016-03-20 07:37:53
glibc21.m4	text/x-c	907 B	-rw-r--r--	2016-03-20 07:37:53
gpg-error.m4	text/x-m4	4.65 KB	-rw-r--r--	2019-10-12 12:20:46
gpgrt.m4	text/x-m4	4.61 KB	-rw-r--r--	2019-10-12 12:20:46
iconv.m4	text/x-c	9.06 KB	-rw-r--r--	2016-03-20 07:37:53
intdiv0.m4	text/x-c	2.35 KB	-rw-r--r--	2016-05-28 12:29:03
intl.m4	text/x-m4	11.84 KB	-rw-r--r--	2016-03-20 07:37:53
intldir.m4	text/x-m4	917 B	-rw-r--r--	2016-03-20 07:37:53
intlmacosx.m4	text/x-m4	2.47 KB	-rw-r--r--	2016-03-20 07:37:53
intmax.m4	text/x-c	1.1 KB	-rw-r--r--	2016-03-20 07:37:53
inttypes-pri.m4	text/x-c	1.22 KB	-rw-r--r--	2016-03-20 07:37:53
inttypes_h.m4	text/x-c	1020 B	-rw-r--r--	2016-03-20 07:37:53
lcmessage.m4	text/x-m4	1.33 KB	-rw-r--r--	2016-03-20 07:37:53
lib-ld.m4	text/x-m4	3.6 KB	-rw-r--r--	2016-06-11 12:59:32
lib-link.m4	text/x-m4	32.28 KB	-rw-r--r--	2016-06-11 12:59:32
lib-prefix.m4	text/x-m4	8.27 KB	-rw-r--r--	2016-06-11 12:59:32
libgcrypt.m4	text/x-m4	6.09 KB	-rw-r--r--	2022-06-28 11:54:07
libtool.m4	text/x-m4	298.69 KB	-rw-r--r--	2019-10-11 02:55:28
libxml.m4	text/x-c	7.7 KB	-rw-r--r--	2017-07-23 05:10:06
libxslt.m4	text/x-c	7.93 KB	-rw-r--r--	2009-05-12 06:29:34
lock.m4	text/x-m4	1.43 KB	-rw-r--r--	2016-03-20 07:37:53
longlong.m4	text/x-m4	4.63 KB	-rw-r--r--	2016-03-20 07:37:53
ltargz.m4	text/x-m4	2.51 KB	-rw-r--r--	2019-10-11 02:55:28
ltdl.m4	text/x-Algol68	29.33 KB	-rw-r--r--	2019-10-11 02:55:28
ltoptions.m4	text/x-m4	14.17 KB	-rw-r--r--	2019-10-11 02:55:28
ltsugar.m4	text/plain	4.28 KB	-rw-r--r--	2019-10-11 02:55:28
ltversion.m4	text/plain	699 B	-rw-r--r--	2019-10-11 02:55:28
lt~obsolete.m4	text/plain	6 KB	-rw-r--r--	2019-10-11 02:55:28
mysql.m4	text/x-m4	4.12 KB	-rw-r--r--	2025-07-28 03:52:28
nls.m4	text/x-m4	1.19 KB	-rw-r--r--	2016-03-20 07:37:53
pkg.m4	text/x-m4	12.37 KB	-rw-r--r--	2017-03-24 05:16:18
po.m4	text/x-m4	18.52 KB	-rw-r--r--	2016-03-20 07:37:53
printf-posix.m4	text/x-c	1.54 KB	-rw-r--r--	2016-03-20 07:37:53
progtest.m4	text/x-m4	3.02 KB	-rw-r--r--	2016-03-20 07:37:53
size_max.m4	text/x-c	2.99 KB	-rw-r--r--	2016-03-20 07:37:53
stdint_h.m4	text/x-m4	995 B	-rw-r--r--	2016-03-20 07:37:53
threadlib.m4	text/x-c	14.8 KB	-rw-r--r--	2016-03-20 07:37:53
uintmax_t.m4	text/x-m4	1.09 KB	-rw-r--r--	2016-03-20 07:37:53
visibility.m4	text/x-m4	3.27 KB	-rw-r--r--	2016-03-20 07:37:53
wchar_t.m4	text/x-m4	818 B	-rw-r--r--	2016-03-20 07:37:53
wint_t.m4	text/x-c	1.03 KB	-rw-r--r--	2016-03-20 07:37:53
xsize.m4	text/x-m4	406 B	-rw-r--r--	2016-03-20 07:37:53

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