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# unlinkat.m4 serial 2
dnl Copyright (C) 2004-2018 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.
# Written by Jim Meyering.
AC_DEFUN([gl_FUNC_UNLINKAT],
[
AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
AC_CHECK_FUNCS_ONCE([unlinkat])
AC_REQUIRE([gl_FUNC_UNLINK])
AC_REQUIRE([gl_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK])
if test $ac_cv_func_unlinkat = no; then
HAVE_UNLINKAT=0
else
case "$gl_cv_func_lstat_dereferences_slashed_symlink" in
*no)
# Solaris 9 has *at functions, but uniformly mishandles trailing
# slash in all of them.
REPLACE_UNLINKAT=1
;;
*)
# GNU/Hurd has unlinkat, but it has the same bug as unlink.
# Darwin has unlinkat, but it has the same UNLINK_PARENT_BUG.
if test $REPLACE_UNLINK = 1; then
REPLACE_UNLINKAT=1
fi
;;
esac
fi
])
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