1 /*
2 * Copyright (c) 2005 Apple Computer, Inc. All rights reserved.
3 *
4 * @APPLE_LICENSE_HEADER_START@
5 *
6 * This file contains Original Code and/or Modifications of Original Code
7 * as defined in and that are subject to the Apple Public Source License
8 * Version 2.0 (the 'License'). You may not use this file except in
9 * compliance with the License. Please obtain a copy of the License at
10 * http://www.opensource.apple.com/apsl/ and read it before using this
11 * file.
12 *
13 * The Original Code and all software distributed under the License are
14 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
15 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
16 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
18 * Please see the License for the specific language governing rights and
19 * limitations under the License.
20 *
21 * @APPLE_LICENSE_HEADER_END@
22 */
23
24 #include <sys/cdefs.h>
25
26 #if __DARWIN_UNIX03
27
28 #include <sys/types.h>
29 #include <sys/stat.h>
30 #include "_errno.h"
31
32 extern int __fchmod(int fd, mode_t mode);
33
34 /*
35 * fchmod stub, ignore S_ISUID and/or S_ISGID on EPERM,
36 * mandated for conformance.
37 *
38 * This is for UNIX03 only.
39 */
40 int
fchmod(int fd,mode_t mode)41 fchmod(int fd, mode_t mode)
42 {
43 int res = __fchmod(fd, mode);
44
45 if (res >= 0 || errno != EPERM || (mode & (S_ISUID | S_ISGID)) == 0) {
46 return res;
47 }
48 if (mode & S_ISGID) {
49 res = __fchmod(fd, mode ^ S_ISGID);
50 if (res >= 0 || errno != EPERM) {
51 return res;
52 }
53 }
54 if (mode & S_ISUID) {
55 res = __fchmod(fd, mode ^ S_ISUID);
56 if (res >= 0 || errno != EPERM) {
57 return res;
58 }
59 }
60 if ((mode & (S_ISUID | S_ISGID)) == (S_ISUID | S_ISGID)) {
61 res = __fchmod(fd, mode ^ (S_ISUID | S_ISGID));
62 }
63 return res;
64 }
65
66 #endif /* __DARWIN_UNIX03 */
67