2 dnl Copyright (C) 2006, 2007, 2009 Free Software Foundation, Inc.
3 dnl This file is free software; the Free Software Foundation
4 dnl gives unlimited permission to copy and/or distribute it,
5 dnl with or without modifications, as long as this notice is preserved.
7 dnl Written by Paul Eggert.
11 AC_REQUIRE([gl_FCNTL_H_DEFAULTS])
12 AC_CACHE_CHECK([for working fcntl.h], [gl_cv_header_working_fcntl_h],
15 [[#include <sys/types.h>
25 static int const constants[] =
27 O_CREAT, O_EXCL, O_NOCTTY, O_TRUNC, O_APPEND,
28 O_NONBLOCK, O_SYNC, O_ACCMODE, O_RDONLY, O_RDWR, O_WRONLY
32 int status = !constants;
34 static char const sym[] = "conftest.sym";
35 if (symlink (".", sym) != 0
36 || close (open (sym, O_RDONLY | O_NOFOLLOW)) == 0)
40 static char const file[] = "confdefs.h";
41 int fd = open (file, O_RDONLY | O_NOATIME);
45 || fstat (fd, &st0) != 0
47 || read (fd, &c, 1) != 1
49 || stat (file, &st1) != 0
50 || st0.st_atime != st1.st_atime)
54 [gl_cv_header_working_fcntl_h=yes],
56 32) gl_cv_header_working_fcntl_h='no (bad O_NOFOLLOW)';; #(
57 64) gl_cv_header_working_fcntl_h='no (bad O_NOATIME)';; #(
58 96) gl_cv_header_working_fcntl_h='no (bad O_NOATIME, O_NOFOLLOW)';; #(
59 *) gl_cv_header_working_fcntl_h='no';;
61 [gl_cv_header_working_fcntl_h=cross-compiling])])
63 case $gl_cv_header_working_fcntl_h in #(
64 *O_NOATIME* | no | cross-compiling) ac_val=0;; #(
67 AC_DEFINE_UNQUOTED([HAVE_WORKING_O_NOATIME], [$ac_val],
68 [Define to 1 if O_NOATIME works.])
70 case $gl_cv_header_working_fcntl_h in #(
71 *O_NOFOLLOW* | no | cross-compiling) ac_val=0;; #(
74 AC_DEFINE_UNQUOTED([HAVE_WORKING_O_NOFOLLOW], [$ac_val],
75 [Define to 1 if O_NOFOLLOW works.])
77 gl_CHECK_NEXT_HEADERS([fcntl.h])
82 AC_DEFUN([gl_FCNTL_MODULE_INDICATOR],
84 dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
85 AC_REQUIRE([gl_FCNTL_H_DEFAULTS])
86 GNULIB_[]m4_translit([$1],[abcdefghijklmnopqrstuvwxyz./-],[ABCDEFGHIJKLMNOPQRSTUVWXYZ___])=1
89 AC_DEFUN([gl_FCNTL_H_DEFAULTS],
91 GNULIB_OPEN=0; AC_SUBST([GNULIB_OPEN])
92 dnl Assume proper GNU behavior unless another module says otherwise.
93 REPLACE_OPEN=0; AC_SUBST([REPLACE_OPEN])