1 /* Test whether ACLs are well supported on this system. 2 3 Copyright 2013-2021 Free Software Foundation, Inc. 4 5 This program is free software: you can redistribute it and/or modify 6 it under the terms of the GNU General Public License as published by 7 the Free Software Foundation; either version 3 of the License, or 8 (at your option) any later version. 9 10 This program is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 GNU General Public License for more details. 14 15 You should have received a copy of the GNU General Public License 16 along with this program. If not, see <https://www.gnu.org/licenses/>. 17 18 Written by Paul Eggert. */ 19 20 #include <config.h> 21 22 #include <acl.h> 23 24 #include <errno.h> 25 26 /* Return true if errno value ERRNUM indicates that ACLs are well 27 supported on this system. ERRNUM should be an errno value obtained 28 after an ACL-related system call fails. */ 29 bool 30 acl_errno_valid (int errnum) /* */ 31 { 32 /* Recognize some common errors such as from an NFS mount that does 33 not support ACLs, even when local drives do. */ 34 switch (errnum) 35 { 36 case EBUSY: return false; 37 case EINVAL: return false; 38 #if defined __APPLE__ && defined __MACH__ 39 case ENOENT: return false; 40 #endif 41 case ENOSYS: return false; 42 43 #if defined ENOTSUP && ENOTSUP != EOPNOTSUPP 44 # if ENOTSUP != ENOSYS /* Needed for the MS-Windows port of GNU Emacs. */ 45 case ENOTSUP: return false; 46 # endif 47 #endif 48 49 case EOPNOTSUPP: return false; 50 default: return true; 51 } 52 }