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 <stdarg.h>
 25  #include <sys/msg.h>
 26  
 27  /*
 28   * Stub function to account for the differences in the ipc_perm structure,
 29   * while maintaining binary backward compatibility.
 30   *
 31   * This is only the legacy behavior.
 32   */
 33  extern int __msgctl(int, int, struct msqid_ds *);
 34  
 35  int
 36  msgctl(int msqid, int cmd, struct msqid_ds *ds)
 37  {
 38  	struct __msqid_ds_old	*ds_old = (struct __msqid_ds_old *)ds;
 39  	struct __msqid_ds_new	ds2;
 40  	struct __msqid_ds_new	*ds_new = &ds2;
 41  	int			rv;
 42  
 43  #define	_UP_CVT(x)	ds_new-> x = ds_old-> x
 44  #define	_DN_CVT(x)	ds_old-> x = ds_new-> x
 45  
 46  	if (cmd == IPC_SET) {
 47  		/* convert before call */
 48  		_UP_CVT(msg_perm.uid);
 49  		_UP_CVT(msg_perm.gid);
 50  		_UP_CVT(msg_perm.cuid);
 51  		_UP_CVT(msg_perm.cgid);
 52  		_UP_CVT(msg_perm.mode);
 53  		ds_new->msg_perm._seq = ds_old->msg_perm.seq;
 54  		ds_new->msg_perm._key = ds_old->msg_perm.key;
 55  		_UP_CVT(msg_first);
 56  		_UP_CVT(msg_last);
 57  		_UP_CVT(msg_cbytes);
 58  		_UP_CVT(msg_qnum);
 59  		_UP_CVT(msg_qbytes);
 60  		_UP_CVT(msg_lspid);
 61  		_UP_CVT(msg_lrpid);
 62  		_UP_CVT(msg_stime);
 63  		_UP_CVT(msg_pad1);	/* binary compatibility */
 64  		_UP_CVT(msg_rtime);
 65  		_UP_CVT(msg_pad2);	/* binary compatibility */
 66  		_UP_CVT(msg_ctime);
 67  		_UP_CVT(msg_pad3);	/* binary compatibility */
 68  		_UP_CVT(msg_pad4[0]);	/* binary compatibility */
 69  		_UP_CVT(msg_pad4[1]);	/* binary compatibility */
 70  		_UP_CVT(msg_pad4[2]);	/* binary compatibility */
 71  		_UP_CVT(msg_pad4[3]);	/* binary compatibility */
 72  	}
 73  
 74  	rv = __msgctl(msqid, cmd, ds_new);
 75  
 76  	if (cmd == IPC_STAT) {
 77  		/* convert after call */
 78  		_DN_CVT(msg_perm.uid);	/* warning!  precision loss! */
 79  		_DN_CVT(msg_perm.gid);	/* warning!  precision loss! */
 80  		_DN_CVT(msg_perm.cuid);	/* warning!  precision loss! */
 81  		_DN_CVT(msg_perm.cgid);	/* warning!  precision loss! */
 82  		_DN_CVT(msg_perm.mode);
 83  		ds_old->msg_perm.seq = ds_new->msg_perm._seq;
 84  		ds_old->msg_perm.key = ds_new->msg_perm._key;
 85  		_DN_CVT(msg_first);
 86  		_DN_CVT(msg_last);
 87  		_DN_CVT(msg_cbytes);
 88  		_DN_CVT(msg_qnum);
 89  		_DN_CVT(msg_qbytes);
 90  		_DN_CVT(msg_lspid);
 91  		_DN_CVT(msg_lrpid);
 92  		_DN_CVT(msg_stime);
 93  		_DN_CVT(msg_pad1);	/* binary compatibility */
 94  		_DN_CVT(msg_rtime);
 95  		_DN_CVT(msg_pad2);	/* binary compatibility */
 96  		_DN_CVT(msg_ctime);
 97  		_DN_CVT(msg_pad3);	/* binary compatibility */
 98  		_DN_CVT(msg_pad4[0]);	/* binary compatibility */
 99  		_DN_CVT(msg_pad4[1]);	/* binary compatibility */
100  		_DN_CVT(msg_pad4[2]);	/* binary compatibility */
101  		_DN_CVT(msg_pad4[3]);	/* binary compatibility */
102  	}
103  
104  	return (rv);
105  }