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# See if we need to use our replacement for Solaris' openat et al functions.
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dnl Copyright (C) 2004-2010 Free Software Foundation, Inc.
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dnl This file is free software; the Free Software Foundation
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dnl gives unlimited permission to copy and/or distribute it,
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dnl with or without modifications, as long as this notice is preserved.
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# Written by Jim Meyering.
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AC_DEFUN([gl_FUNC_OPENAT],
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AC_REQUIRE([gl_FCNTL_H_DEFAULTS])
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AC_REQUIRE([gl_SYS_STAT_H_DEFAULTS])
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AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
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AC_LIBOBJ([openat-proc])
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AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
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AC_CHECK_FUNCS_ONCE([lchmod])
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AC_REPLACE_FUNCS([fchmodat fstatat mkdirat openat unlinkat])
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AC_REQUIRE([AC_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK])
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AC_REQUIRE([gl_FUNC_UNLINK])
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case $ac_cv_func_openat+$ac_cv_func_lstat_dereferences_slashed_symlink in
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# GNU/Hurd has unlinkat, but it has the same bug as unlink.
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if test $REPLACE_UNLINK = 1; then
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# Solaris 9 has *at functions, but uniformly mishandles trailing
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# slash in all of them.
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HAVE_UNLINKAT=0 # No known system with unlinkat but not openat
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HAVE_FSTATAT=0 # No known system with fstatat but not openat
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if test $ac_cv_func_fchmodat != yes; then
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if test $ac_cv_func_mkdirat != yes; then
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# gl_FUNC_FCHOWNAT_DEREF_BUG([ACTION-IF-BUGGY[, ACTION-IF-NOT_BUGGY]])
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AC_DEFUN([gl_FUNC_FCHOWNAT_DEREF_BUG],
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AC_CACHE_CHECK([whether fchownat works with AT_SYMLINK_NOFOLLOW],
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gl_cv_func_fchownat_nofollow_works,
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gl_dangle=conftest.dangle
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# Remove any remnants of a previous test.
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# Arrange for deletion of the temporary file this test creates.
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ac_clean_files="$ac_clean_files $gl_dangle"
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ln -s conftest.no-such $gl_dangle
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#include <sys/types.h>
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return (fchownat (AT_FDCWD, "$gl_dangle", -1, getgid (),
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AT_SYMLINK_NOFOLLOW) != 0
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[gl_cv_func_fchownat_nofollow_works=yes],
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[gl_cv_func_fchownat_nofollow_works=no],
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[gl_cv_func_fchownat_nofollow_works=no],
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AS_IF([test $gl_cv_func_fchownat_nofollow_works = no], [$1], [$2])
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# If we have the fchownat function, and it has the bug (in glibc-2.4)
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# that it dereferences symlinks even with AT_SYMLINK_NOFOLLOW, then
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# use the replacement function.
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# Also use the replacement function if fchownat is simply not available.
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AC_DEFUN([gl_FUNC_FCHOWNAT],
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AC_REQUIRE([gl_FUNC_CHOWN])
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AC_CHECK_FUNC([fchownat],
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[gl_FUNC_FCHOWNAT_DEREF_BUG([REPLACE_FCHOWNAT=1
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AC_DEFINE([FCHOWNAT_NOFOLLOW_BUG], [1], [Define to 1 if your
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platform has fchownat, but it cannot perform lchown tasks.])])],
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if test $REPLACE_CHOWN = 1; then
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if test $HAVE_FCHOWNAT = 0 || test $REPLACE_FCHOWNAT = 1; then
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AC_LIBOBJ([fchownat])
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AC_DEFUN([gl_PREREQ_OPENAT],
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AC_REQUIRE([AC_C_INLINE])
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AC_REQUIRE([gl_PROMOTED_TYPE_MODE_T])