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53 lines
1.6 KiB
C
53 lines
1.6 KiB
C
/* Test whether ACLs are well supported on this system.
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Copyright 2013-2019 Free Software Foundation, Inc.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>.
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Written by Paul Eggert. */
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#include <config.h>
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#include <acl.h>
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#include <errno.h>
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/* Return true if errno value ERRNUM indicates that ACLs are well
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supported on this system. ERRNUM should be an errno value obtained
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after an ACL-related system call fails. */
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bool
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acl_errno_valid (int errnum)
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{
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/* Recognize some common errors such as from an NFS mount that does
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not support ACLs, even when local drives do. */
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switch (errnum)
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{
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case EBUSY: return false;
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case EINVAL: return false;
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#if defined __APPLE__ && defined __MACH__
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case ENOENT: return false;
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#endif
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case ENOSYS: return false;
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#if defined ENOTSUP && ENOTSUP != EOPNOTSUPP
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# if ENOTSUP != ENOSYS /* Needed for the MS-Windows port of GNU Emacs. */
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case ENOTSUP: return false;
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# endif
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#endif
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case EOPNOTSUPP: return false;
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default: return true;
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}
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}
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