+
−/* Determine whether we can write any file.
+
−
+
−   Copyright (C) 2007, 2009-2015 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 <http://www.gnu.org/licenses/>.  */
+
−
+
−/* Written by Paul Eggert.  */
+
−
+
−#include <config.h>
+
−
+
−#include "write-any-file.h"
+
−#include "priv-set.h"
+
−#include "root-uid.h"
+
−
+
−#include <unistd.h>
+
−
+
−/* Return true if we know that we can write any file, including
+
−   writing directories.  */
+
−
+
−bool
+
−can_write_any_file (void)
+
−{
+
−  static bool initialized;
+
−  static bool can_write;
+
−
+
−  if (! initialized)
+
−    {
+
−      bool can = false;
+
−#if defined PRIV_FILE_DAC_WRITE
+
−      can = (priv_set_ismember (PRIV_FILE_DAC_WRITE) == 1);
+
−#else
+
−      /* In traditional Unix, only root can unlink directories.  */
+
−      can = (geteuid () == ROOT_UID);
+
−#endif
+
−      can_write = can;
+
−      initialized = true;
+
−    }
+
−
+
−  return can_write;
+
−}