2 # See if we need to use our replacement for Solaris' openat et al functions.
4 dnl Copyright (C) 2004-2011 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])
20 AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
23 AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
24 AC_CHECK_FUNCS_ONCE([mkdirat openat unlinkat])
25 AC_REQUIRE([gl_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK])
26 AC_REQUIRE([gl_FUNC_UNLINK])
27 case $ac_cv_func_openat+$gl_cv_func_lstat_dereferences_slashed_symlink in
29 # GNU/Hurd has unlinkat, but it has the same bug as unlink.
30 if test $REPLACE_UNLINK = 1; then
34 # Solaris 9 has *at functions, but uniformly mishandles trailing
35 # slash in all of them.
41 HAVE_UNLINKAT=0 # No known system with unlinkat but not openat
44 if test $ac_cv_func_mkdirat != yes; then
49 dnl This is tested at least via getcwd.c.
50 gl_MODULE_INDICATOR([openat])
53 # If we have the fstatat function, and it has the bug (in AIX 7.1)
54 # that it does not fill in st_size correctly, use the replacement function.
55 AC_DEFUN([gl_FUNC_FSTATAT],
57 AC_REQUIRE([gl_SYS_STAT_H_DEFAULTS])
58 AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
59 AC_REQUIRE([gl_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK])
60 AC_CHECK_FUNCS_ONCE([fstatat])
62 if test $ac_cv_func_fstatat = no; then
65 dnl Test for an AIX 7.1 bug; see
66 dnl <http://lists.gnu.org/archive/html/bug-tar/2011-09/msg00015.html>.
67 AC_CACHE_CHECK([whether fstatat (..., 0) works],
68 [gl_cv_func_fstatat_zero_flag],
69 [gl_cv_func_fstatat_zero_flag=no
79 return fstatat (AT_FDCWD, ".", &a, 0) != 0;
82 [gl_cv_func_fstatat_zero_flag=yes])])
84 case $gl_cv_func_fstatat_zero_flag+$gl_cv_func_lstat_dereferences_slashed_symlink in
87 if test $gl_cv_func_fstatat_zero_flag != yes; then
88 AC_DEFINE([FSTATAT_ZERO_FLAG_BROKEN], [1],
89 [Define to 1 if fstatat (..., 0) does not work,
97 AC_DEFUN([gl_PREREQ_OPENAT],
99 AC_REQUIRE([AC_C_INLINE])
100 AC_REQUIRE([gl_PROMOTED_TYPE_MODE_T])