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   */
32  extern int __shmctl(int, int, void *);
33  
34  int
35  shmctl(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  }