2 # See if we need to use our replacement for Solaris' openat et al functions.
4 dnl Copyright (C) 2004, 2005, 2006, 2007, 2008 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 AC_REQUIRE([AC_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK])
19 case $ac_cv_func_openat+$ac_cv_func_lstat_dereferences_slashed_symlink in
21 yes+*) AC_LIBOBJ([fstatat]);;
23 AC_DEFINE([__OPENAT_PREFIX], [[rpl_]],
24 [Define to rpl_ if the openat replacement function should be used.])
30 # gl_FUNC_FCHOWNAT_DEREF_BUG([ACTION-IF-BUGGY[, ACTION-IF-NOT_BUGGY]])
31 AC_DEFUN([gl_FUNC_FCHOWNAT_DEREF_BUG],
33 AC_CACHE_CHECK([whether fchownat works with AT_SYMLINK_NOFOLLOW],
34 gl_cv_func_fchownat_nofollow_works,
36 gl_dangle=conftest.dangle
37 # Remove any remnants of a previous test.
39 # Arrange for deletion of the temporary file this test creates.
40 ac_clean_files="$ac_clean_files $gl_dangle"
41 ln -s conftest.no-such $gl_dangle
49 #include <sys/types.h>
53 return (fchownat (AT_FDCWD, "$gl_dangle", -1, getgid (),
54 AT_SYMLINK_NOFOLLOW) != 0
58 [gl_cv_func_fchownat_nofollow_works=yes],
59 [gl_cv_func_fchownat_nofollow_works=no],
60 [gl_cv_func_fchownat_nofollow_works=no],
63 AS_IF([test $gl_cv_func_fchownat_nofollow_works = no], [$1], [$2])
66 # If we have the fchownat function, and it has the bug (in glibc-2.4)
67 # that it dereferences symlinks even with AT_SYMLINK_NOFOLLOW, then
68 # use the replacement function.
69 # Also use the replacement function if fchownat is simply not available.
70 AC_DEFUN([gl_FUNC_FCHOWNAT],
72 # Assume we'll use the replacement function.
73 # The only case in which we won't is when we have fchownat, and it works.
74 use_replacement_fchownat=yes
76 AC_CHECK_FUNC([fchownat], [have_fchownat=yes], [have_fchownat=no])
77 if test $have_fchownat = yes; then
78 gl_FUNC_FCHOWNAT_DEREF_BUG([], [use_replacement_fchownat=no])
81 if test $use_replacement_fchownat = yes; then
83 AC_DEFINE(fchownat, rpl_fchownat,
84 [Define to rpl_fchownat if the replacement function should be used.])
88 AC_DEFUN([gl_PREREQ_OPENAT],