FreeBSD/Linux Kernel Cross Reference
sys/bsd/kern/sysv_ipc.c

     /*
      * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
      *
      * @APPLE_LICENSE_HEADER_START@
      * 
      * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
      * 
      * This file contains Original Code and/or Modifications of Original Code
      * as defined in and that are subject to the Apple Public Source License
     * Version 2.0 (the 'License'). You may not use this file except in
     * compliance with the License. Please obtain a copy of the License at
     * http://www.opensource.apple.com/apsl/ and read it before using this
     * file.
     * 
     * The Original Code and all software distributed under the License are
     * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
     * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
     * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
     * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
     * Please see the License for the specific language governing rights and
     * limitations under the License.
     * 
     * @APPLE_LICENSE_HEADER_END@
     */
    /*      $NetBSD: sysv_ipc.c,v 1.7 1994/06/29 06:33:11 cgd Exp $ */
    
    /*
     * Copyright (c) 1994 Herb Peyerl <hpeyerl@novatel.ca>
     * All rights reserved.
     *
     * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *      This product includes software developed by Herb Peyerl.
     * 4. The name of Herb Peyerl may not be used to endorse or promote products
     *    derived from this software without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     */
    
    
    #include <sys/param.h>
    #include <sys/ipc.h>
    #include <sys/ucred.h>
    
    
    /*
     * Check for ipc permission
     *
     * XXX: Should pass proc argument so that we can pass 
     * XXX: proc->p_acflag to suser()
     */
    
    int
    ipcperm(cred, perm, mode)
            struct ucred *cred;
            struct ipc_perm *perm;
            int mode;
    {
    
            if (!suser(cred, (u_short *)NULL))
                    return (0);
    
            /* Check for user match. */
            if (cred->cr_uid != perm->cuid && cred->cr_uid != perm->uid) {
                    if (mode & IPC_M)
                            return (EPERM);
                    /* Check for group match. */
                    mode >>= 3;
                    if (!groupmember(perm->gid, cred) &&
                        !groupmember(perm->cgid, cred))
                            /* Check for `other' match. */
                            mode >>= 3;
            }
    
            if (mode & IPC_M)
                    return (0);
            return ((mode & perm->mode) == mode ? 0 : EACCES);
    }
    
    
    
    /*
    * SYSVMSG stubs
    */
   
   int
   msgsys(p, uap)
           struct proc *p;
           /* XXX actually varargs. */
   #if 0
           struct msgsys_args *uap;
   #else
           void *uap;
   #endif
   {
           return(EOPNOTSUPP);
   };
   
   int
   msgctl(p, uap)
           struct proc *p;
   #if 0
           register struct msgctl_args *uap;
   #else
           void *uap;
   #endif
   {
           return(EOPNOTSUPP);
   };
   
   int
   msgget(p, uap)
           struct proc *p;
   #if 0
           register struct msgget_args *uap;
   #else
           void *uap;
   #endif
   {
           return(EOPNOTSUPP);
   };
   
   int
   msgsnd(p, uap)
           struct proc *p;
   #if 0
           register struct msgsnd_args *uap;
   #else
           void *uap;
   #endif
   {
           return(EOPNOTSUPP);
   };
   
   int
   msgrcv(p, uap)
           struct proc *p;
   #if 0
           register struct msgrcv_args *uap;
   #else
           void *uap;
   #endif
   {
           return(EOPNOTSUPP);
   };

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