/* unlinkdir.c - determine (and maybe change) whether we can unlink directories
- Copyright (C) 2005 Free Software Foundation, Inc.
+ Copyright (C) 2005-2006, 2009 Free Software Foundation, Inc.
- This program is free software; you can redistribute it and/or modify
+ This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2, or (at your option)
- any later version.
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software Foundation,
- Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. */
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
/* Written by Paul Eggert and Jim Meyering. */
-#ifdef HAVE_CONFIG_H
-# include <config.h>
-#endif
+#include <config.h>
#include "unlinkdir.h"
#if HAVE_PRIV_H
# include <priv.h>
#endif
-#if HAVE_UNISTD_H
-# include <unistd.h>
-#endif
+#include <unistd.h>
#if ! UNLINK_CANNOT_UNLINK_DIR
/* Return true if we cannot unlink directories, false if we might be
able to unlink directories. If possible, tell the kernel we don't
- want to be able to unlink directories, so that we can return true. */
+ want to be able to unlink directories, so that we can return true.
+
+ Note: this function may modify the process privilege set, to remove
+ the PRIV_SYS_LINKDIR privilege, so is neither thread-safe, nor
+ appropriate for use in a library. */
bool
cannot_unlink_dir (void)