view lib/write-any-file.c @ 17334:bb52d9cece01

unsetenv etc.: port to Solaris 11 + GNU Emacs * lib/canonicalize-lgpl.c, lib/getaddrinfo.c, lib/getdelim.c: * lib/glob.c, lib/random_r.c, lib/setenv.c, lib/tsearch.c: * lib/unsetenv.c (_GL_ARG_NONNULL): Define before including <config.h>. GNU Emacs's <config.h> includes <stdlib.h> (which is not a great idea but is too painful to fix right now), and without this gnulib change <stdlib.h> was defining _GL_ARG_NONNULL incorrectly when compiling unsetenv.c on Solaris 11. Fix the problem for unsetenv.c, and fix other similar occurrences.
author Paul Eggert <eggert@cs.ucla.edu>
date Mon, 11 Feb 2013 14:58:56 -0800
parents e542fd46ad6f
children 344018b6e5d7
line wrap: on
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/* Determine whether we can write any file.

   Copyright (C) 2007, 2009-2013 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;
}