/* Provide a stub lchown function for systems that lack it.
- Copyright (C) 1998, 1999 Free Software Foundation, Inc.
- This program is free software; you can redistribute it and/or modify
+ Copyright (C) 1998, 1999, 2002, 2004, 2006, 2007 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 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
/* written by Jim Meyering */
#include <config.h>
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <errno.h>
-#ifndef errno
-extern int errno;
-#endif
-#include "lchown.h"
-
-#ifdef STAT_MACROS_BROKEN
-# undef S_ISLNK
-#endif
-#if !defined(S_ISLNK) && defined(S_IFLNK)
-# define S_ISLNK(m) (((m) & S_IFMT) == S_IFLNK)
+/* If the system chown does not follow symlinks, we don't want it
+ replaced by gnulib's chown, which does follow symlinks. */
+#if CHOWN_MODIFIES_SYMLINK
+# define REPLACE_CHOWN 0
#endif
+#include <unistd.h>
+#include <errno.h>
+#include <sys/stat.h>
-/* Declare chown to avoid a warning. Don't include unistd.h,
- because it may have a conflicting prototype for lchown. */
-int chown ();
+/* Some systems don't have EOPNOTSUPP. */
+#ifndef EOPNOTSUPP
+# ifdef ENOTSUP
+# define EOPNOTSUPP ENOTSUP
+# else
+/* Some systems don't have ENOTSUP either. */
+# define EOPNOTSUPP EINVAL
+# endif
+#endif
/* Work just like chown, except when FILE is a symbolic link.
- In that case, set errno to ENOSYS and return -1. */
+ In that case, set errno to EOPNOTSUPP and return -1.
+ But if autoconf tests determined that chown modifies
+ symlinks, then just call chown. */
int
lchown (const char *file, uid_t uid, gid_t gid)
{
+#if ! CHOWN_MODIFIES_SYMLINK
struct stat stats;
if (lstat (file, &stats) == 0 && S_ISLNK (stats.st_mode))
{
- errno = ENOSYS;
+ errno = EOPNOTSUPP;
return -1;
}
+#endif
return chown (file, uid, gid);
}