+
−/* Test whether ACLs are well supported on this system.
+
−
+
−   Copyright 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 <acl.h>
+
−
+
−#include <errno.h>
+
−
+
−/* Return true if errno value ERRNUM indicates that ACLs are well
+
−   supported on this system.  ERRNUM should be an errno value obtained
+
−   after an ACL-related system call fails.  */
+
−bool
+
−acl_errno_valid (int errnum)
+
−{
+
−  /* Recognize some common errors such as from an NFS mount that does
+
−     not support ACLs, even when local drives do.  */
+
−  switch (errnum)
+
−    {
+
−    case EBUSY: return false;
+
−    case EINVAL: return false;
+
−#if defined __APPLE__ && defined __MACH__
+
−    case ENOENT: return false;
+
−#endif
+
−    case ENOSYS: return false;
+
−
+
−#if defined ENOTSUP && ENOTSUP != EOPNOTSUPP
+
−# if ENOTSUP != ENOSYS /* Needed for the MS-Windows port of GNU Emacs.  */
+
−    case ENOTSUP: return false;
+
−# endif
+
−#endif
+
−
+
−    case EOPNOTSUPP: return false;
+
−    default: return true;
+
−    }
+
−}