1 /*
2 * Copyright (c) 2004 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 #ifndef NO_SYSCALL_LEGACY
25
26 #define _NONSTD_SOURCE
27 #include <sys/cdefs.h>
28
29 #include "_errno.h"
30 #include <sys/types.h>
31 #include <sys/mman.h>
32 #include <mach/vm_param.h>
33
34 /*
35 * Stub function to account for the differences in standard compliance
36 * while maintaining binary backward compatibility.
37 *
38 * This is only the legacy behavior.
39 */
40 extern int __mprotect(void *, size_t, int);
41
42 int
mprotect(void * addr,size_t len,int prot)43 mprotect(void *addr, size_t len, int prot)
44 {
45 void *aligned_addr;
46 size_t offset;
47 int rv;
48
49 /*
50 * Page-align "addr" since the system now requires it
51 * for standards compliance.
52 * Update "len" to reflect the alignment.
53 */
54 offset = ((uintptr_t) addr) & PAGE_MASK;
55 aligned_addr = (void *) (((uintptr_t) addr) & ~PAGE_MASK);
56 len += offset;
57 rv = __mprotect(aligned_addr, len, prot);
58 if (rv == -1 && errno == ENOMEM) {
59 /*
60 * Standards now require that we return ENOMEM if there was
61 * a hole in the address range. Panther and earlier used
62 * to return an EINVAL error, so honor backwards compatibility.
63 */
64 errno = EINVAL;
65 }
66 return rv;
67 }
68
69 #endif /* NO_SYSCALL_LEGACY */
70