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/* Test whether ACLs are well supported on this system.
Copyright 2013-2023 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. */
#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;
}
}
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