1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
|
# fchdir.m4 serial 21
dnl Copyright (C) 2006-2015 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.
AC_DEFUN([gl_FUNC_FCHDIR],
[
AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
AC_REQUIRE([gl_DIRENT_H_DEFAULTS])
AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
AC_CHECK_DECLS_ONCE([fchdir])
if test $ac_cv_have_decl_fchdir = no; then
HAVE_DECL_FCHDIR=0
fi
AC_REQUIRE([gl_TEST_FCHDIR])
if test $HAVE_FCHDIR = 0; then
AC_LIBOBJ([fchdir])
gl_PREREQ_FCHDIR
AC_DEFINE([REPLACE_FCHDIR], [1],
[Define to 1 if gnulib's fchdir() replacement is used.])
dnl We must also replace anything that can manipulate a directory fd,
dnl to keep our bookkeeping up-to-date. We don't have to replace
dnl fstatat, since no platform has fstatat but lacks fchdir.
AC_CACHE_CHECK([whether open can visit directories],
[gl_cv_func_open_directory_works],
[AC_RUN_IFELSE([AC_LANG_PROGRAM([[#include <fcntl.h>
]], [return open(".", O_RDONLY) < 0;])],
[gl_cv_func_open_directory_works=yes],
[gl_cv_func_open_directory_works=no],
[case "$host_os" in
# Guess yes on glibc systems.
*-gnu*) gl_cv_func_open_directory_works="guessing yes" ;;
# If we don't know, assume the worst.
*) gl_cv_func_open_directory_works="guessing no" ;;
esac
])])
case "$gl_cv_func_open_directory_works" in
*yes) ;;
*)
AC_DEFINE([REPLACE_OPEN_DIRECTORY], [1], [Define to 1 if open() should
work around the inability to open a directory.])
;;
esac
fi
])
# Determine whether to use the overrides in lib/fchdir.c.
AC_DEFUN([gl_TEST_FCHDIR],
[
AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
AC_CHECK_FUNCS_ONCE([fchdir])
if test $ac_cv_func_fchdir = no; then
HAVE_FCHDIR=0
fi
])
# Prerequisites of lib/fchdir.c.
AC_DEFUN([gl_PREREQ_FCHDIR], [:])
|
