2 # See if we need to use our replacement for Solaris' openat et al functions.
4 dnl Copyright (C) 2004, 2005, 2006, 2007 Free Software Foundation, Inc.
5 dnl This file is free software; the Free Software Foundation
6 dnl gives unlimited permission to copy and/or distribute it,
7 dnl with or without modifications, as long as this notice is preserved.
9 # Written by Jim Meyering.
11 AC_DEFUN([gl_FUNC_OPENAT],
13 AC_LIBOBJ([openat-proc])
14 AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
15 AC_CHECK_FUNCS_ONCE([lchmod])
16 AC_CHECK_FUNCS_ONCE([fdopendir])
17 AC_REPLACE_FUNCS([fchmodat mkdirat openat])
18 case $ac_cv_func_openat+$ac_cv_func_lstat_dereferences_slashed_symlink in
20 yes+*) AC_LIBOBJ([fstatat]);;
22 AC_DEFINE([__OPENAT_PREFIX], [[rpl_]],
23 [Define to rpl_ if the openat replacement function should be used.])
29 # gl_FUNC_FCHOWNAT_DEREF_BUG([ACTION-IF-BUGGY[, ACTION-IF-NOT_BUGGY]])
30 AC_DEFUN([gl_FUNC_FCHOWNAT_DEREF_BUG],
32 AC_CACHE_CHECK([whether fchownat works with AT_SYMLINK_NOFOLLOW],
33 gl_cv_func_fchownat_nofollow_works,
35 gl_dangle=conftest.dangle
36 # Remove any remnants of a previous test.
38 # Arrange for deletion of the temporary file this test creates.
39 ac_clean_files="$ac_clean_files $gl_dangle"
47 #include <sys/types.h>
51 return (fchownat (AT_FDCWD, "$gl_dangle", -1, getgid (),
52 AT_SYMLINK_NOFOLLOW) != 0
56 [gl_cv_func_fchownat_nofollow_works=yes],
57 [gl_cv_func_fchownat_nofollow_works=no],
58 [gl_cv_func_fchownat_nofollow_works=no],
61 AS_IF([test $gl_cv_func_fchownat_nofollow_works = no], [$1], [$2])
64 # If we have the fchownat function, and it has the bug (in glibc-2.4)
65 # that it dereferences symlinks even with AT_SYMLINK_NOFOLLOW, then
66 # use the replacement function.
67 # Also use the replacement function if fchownat is simply not available.
68 AC_DEFUN([gl_FUNC_FCHOWNAT],
70 # Assume we'll use the replacement function.
71 # The only case in which we won't is when we have fchownat, and it works.
72 use_replacement_fchownat=yes
74 AC_CHECK_FUNC([fchownat], [have_fchownat=yes], [have_fchownat=no])
75 if test $have_fchownat = yes; then
76 gl_FUNC_FCHOWNAT_DEREF_BUG([have_fchownat_bug=yes])
77 if test $have_fchownat_bug = no; then
78 use_replacement_fchownat=no
82 if test $use_replacement_fchownat = yes; then
84 AC_DEFINE(fchownat, rpl_fchownat,
85 [Define to rpl_fchownat if the replacement function should be used.])
89 AC_DEFUN([gl_PREREQ_OPENAT],