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# unlinkdir.m4
# serial 8
dnl Copyright (C) 2005-2007, 2009-2026 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.
dnl This file is offered as-is, without any warranty.
# Written by Paul Eggert.
AC_DEFUN([gl_UNLINKDIR],
[
AC_REQUIRE([AC_CANONICAL_HOST])
AC_CHECK_HEADERS_ONCE([priv.h])
# The Hurd, the Linux kernel, the FreeBSD kernel version 2.2 and later,
# Cygwin, and mingw never let anyone (even root) unlink directories.
# If anyone knows of another system for which unlink can never
# remove a directory, please report it to <bug-coreutils@gnu.org>.
# Unfortunately this is difficult to test for, since it requires root access
# and might create garbage in the file system,
# so the code below simply relies on the kernel name and version number.
case $host_os in
gnu[[0-9]]* | \
linux-* | linux | \
freebsd2.2* | freebsd[[3-9]]* | freebsd[[1-9]][[0-9]]* | \
cygwin | \
mingw* | windows*)
AC_DEFINE([UNLINK_CANNOT_UNLINK_DIR], [1],
[Define to 1 if unlink (dir) cannot possibly succeed.]);;
esac
])
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