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/* unlinkdir.c - determine whether we can unlink directories
Copyright (C) 2005-2006, 2009-2020 Free Software Foundation, Inc.
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 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
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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, see <https://www.gnu.org/licenses/>. */
/* Written by Paul Eggert, Jim Meyering, and David Bartley. */
#include <config.h>
#include "unlinkdir.h"
#include "priv-set.h"
#include "root-uid.h"
#include <unistd.h>
#if ! UNLINK_CANNOT_UNLINK_DIR
/* Return true if we cannot unlink directories, false if we might be
able to unlink directories. */
bool
cannot_unlink_dir (void)
{
static bool initialized;
static bool cannot;
if (! initialized)
{
# if defined PRIV_SYS_LINKDIR
/* We might be able to unlink directories if we cannot
determine our privileges, or if we have the
PRIV_SYS_LINKDIR privilege. */
cannot = (priv_set_ismember (PRIV_SYS_LINKDIR) == 0);
# else
/* In traditional Unix, only root can unlink directories. */
cannot = (geteuid () != ROOT_UID);
# endif
initialized = true;
}
return cannot;
}
#endif
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