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#include <unistd.h>
24#include <sys/shm.h>
25
26/*
27 * Stub function to account for the differences in the ipc_perm structure,
28 * while maintaining binary backward compatibility.
29 *
30 * This is only the legacy behavior.
31 */
32extern int __shmctl(int, int, void *);
33
34int
35shmctl(int shmid, int cmd, struct shmid_ds *ds)
36{
37	struct __shmid_ds_old	*ds_old = (struct __shmid_ds_old *)ds;
38	struct __shmid_ds_new	ds2;
39	struct __shmid_ds_new	*ds_new = &ds2;
40	int			rv;
41
42#define	_UP_CVT(x)	ds_new-> x = ds_old-> x
43#define	_DN_CVT(x)	ds_old-> x = ds_new-> x
44
45	if (cmd == IPC_SET) {
46		/* convert before call */
47		_UP_CVT(shm_perm.uid);
48		_UP_CVT(shm_perm.gid);
49		_UP_CVT(shm_perm.cuid);
50		_UP_CVT(shm_perm.cgid);
51		_UP_CVT(shm_perm.mode);
52		ds_new->shm_perm._seq = ds_old->shm_perm.seq;
53		ds_new->shm_perm._key = ds_old->shm_perm.key;
54		_UP_CVT(shm_segsz);
55		_UP_CVT(shm_lpid);
56		_UP_CVT(shm_cpid);
57		_UP_CVT(shm_nattch);
58		_UP_CVT(shm_atime);
59		_UP_CVT(shm_dtime);
60		_UP_CVT(shm_ctime);
61		_UP_CVT(shm_internal);
62	}
63
64	rv = __shmctl(shmid, cmd, (void *)ds_new);
65
66	if (cmd == IPC_STAT) {
67		/* convert after call */
68		_DN_CVT(shm_perm.uid);	/* warning!  precision loss! */
69		_DN_CVT(shm_perm.gid);	/* warning!  precision loss! */
70		_DN_CVT(shm_perm.cuid);	/* warning!  precision loss! */
71		_DN_CVT(shm_perm.cgid);	/* warning!  precision loss! */
72		_DN_CVT(shm_perm.mode);
73		ds_old->shm_perm.seq = ds_new->shm_perm._seq;
74		ds_old->shm_perm.key = ds_new->shm_perm._key;
75		_DN_CVT(shm_segsz);
76		_DN_CVT(shm_lpid);
77		_DN_CVT(shm_cpid);
78		_DN_CVT(shm_nattch);
79		_DN_CVT(shm_atime);
80		_DN_CVT(shm_dtime);
81		_DN_CVT(shm_ctime);
82		_DN_CVT(shm_internal);
83	}
84
85	return (rv);
86}
87