2 # See if we need to use our replacement for Solaris' openat et al functions.
4 dnl Copyright (C) 2004-2009 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_REQUIRE([gl_FCNTL_H_DEFAULTS])
16 AC_REQUIRE([gl_SYS_STAT_H_DEFAULTS])
21 AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
25 AC_LIBOBJ([openat-proc])
26 AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
27 AC_CHECK_FUNCS_ONCE([lchmod])
28 AC_REPLACE_FUNCS([fchmodat mkdirat openat])
29 AC_REQUIRE([AC_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK])
30 case $ac_cv_func_openat+$ac_cv_func_lstat_dereferences_slashed_symlink in
38 HAVE_UNLINKAT=0 # No known system with unlinkat but not openat
39 HAVE_FSTATAT=0 # No known system with fstatat but not openat
42 if test $ac_cv_func_fchmodat != yes; then
45 if test $ac_cv_func_mkdirat != yes; then
51 # gl_FUNC_FCHOWNAT_DEREF_BUG([ACTION-IF-BUGGY[, ACTION-IF-NOT_BUGGY]])
52 AC_DEFUN([gl_FUNC_FCHOWNAT_DEREF_BUG],
54 AC_CACHE_CHECK([whether fchownat works with AT_SYMLINK_NOFOLLOW],
55 gl_cv_func_fchownat_nofollow_works,
57 gl_dangle=conftest.dangle
58 # Remove any remnants of a previous test.
60 # Arrange for deletion of the temporary file this test creates.
61 ac_clean_files="$ac_clean_files $gl_dangle"
62 ln -s conftest.no-such $gl_dangle
70 #include <sys/types.h>
74 return (fchownat (AT_FDCWD, "$gl_dangle", -1, getgid (),
75 AT_SYMLINK_NOFOLLOW) != 0
79 [gl_cv_func_fchownat_nofollow_works=yes],
80 [gl_cv_func_fchownat_nofollow_works=no],
81 [gl_cv_func_fchownat_nofollow_works=no],
84 AS_IF([test $gl_cv_func_fchownat_nofollow_works = no], [$1], [$2])
87 # If we have the fchownat function, and it has the bug (in glibc-2.4)
88 # that it dereferences symlinks even with AT_SYMLINK_NOFOLLOW, then
89 # use the replacement function.
90 # Also use the replacement function if fchownat is simply not available.
91 AC_DEFUN([gl_FUNC_FCHOWNAT],
93 AC_CHECK_FUNC([fchownat],
94 [gl_FUNC_FCHOWNAT_DEREF_BUG([REPLACE_FCHOWNAT=1])],
96 if test $HAVE_FCHOWNAT = 0 || test $REPLACE_FCHOWNAT = 1; then
101 AC_DEFUN([gl_PREREQ_OPENAT],
103 AC_REQUIRE([gl_PROMOTED_TYPE_MODE_T])