sys/msgctl.c

   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 }