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

     /* $FreeBSD: src/sys/kern/sysv_ipc.c,v 1.4.4.2 2000/05/01 11:29:43 peter Exp $ */
     /*      $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 "opt_sysvipc.h"
    
    #include <sys/param.h>
    #include <sys/kernel.h>
    #include <sys/proc.h>
    #include <sys/systm.h>
    #include <sys/syslog.h>
    #include <sys/sysproto.h>
    #include <sys/ipc.h>
    #include <sys/shm.h>
    #include <sys/sem.h>
    
    #if defined(SYSVSEM) || defined(SYSVSHM) || defined(SYSVMSG)
    
    /*
     * Check for ipc permission
     */
    
    int
    ipcperm(cred, perm, mode)
            struct ucred *cred;
            struct ipc_perm *perm;
            int mode;
    {
    
            if (cred->cr_uid == 0)
                    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);
    }
    
    #endif /* defined(SYSVSEM) || defined(SYSVSHM) || defined(SYSVMSG) */
    
    
    #if !defined(SYSVSEM) || !defined(SYSVSHM) || !defined(SYSVMSG)
    
    static void sysv_nosys __P((struct proc *p, char *s));
    
    static void 
    sysv_nosys(p, s)
            struct proc *p;
            char *s;
    {
            log(LOG_ERR, "cmd %s pid %d tried to use non-present %s\n",
                            p->p_comm, p->p_pid, s);
    }
    
    #if !defined(SYSVSEM)
    
    /*
     * SYSVSEM stubs
     */
   
   int
   semsys(p, uap, retval)
           struct proc *p;
           struct semsys_args *uap;
           int *retval;
   {
           sysv_nosys(p, "SYSVSEM");
           return nosys(p, (struct nosys_args *)uap, retval);
   };
   
   int
   __semctl(p, uap, retval)
           struct proc *p;
           register struct __semctl_args *uap;
           int *retval;
   {
           sysv_nosys(p, "SYSVSEM");
           return nosys(p, (struct nosys_args *)uap, retval);
   };
   
   int
   semget(p, uap, retval)
           struct proc *p;
           register struct semget_args *uap;
           int *retval;
   {
           sysv_nosys(p, "SYSVSEM");
           return nosys(p, (struct nosys_args *)uap, retval);
   };
   
   int
   semop(p, uap, retval)
           struct proc *p;
           register struct semop_args *uap;
           int *retval;
   {
           sysv_nosys(p, "SYSVSEM");
           return nosys(p, (struct nosys_args *)uap, retval);
   };
   
   /* called from kern_exit.c */
   void
   semexit(p)
           struct proc *p;
   {
           return;
   }
   
   #endif /* !defined(SYSVSEM) */
   
   
   #if !defined(SYSVMSG)
   
   /*
    * SYSVMSG stubs
    */
   
   int
   msgsys(p, uap, retval)
           struct proc *p;
           /* XXX actually varargs. */
           struct msgsys_args *uap;
           int *retval;
   {
           sysv_nosys(p, "SYSVMSG");
           return nosys(p, (struct nosys_args *)uap, retval);
   };
   
   int
   msgctl(p, uap, retval)
           struct proc *p;
           register struct msgctl_args *uap;
           int *retval;
   {
           sysv_nosys(p, "SYSVMSG");
           return nosys(p, (struct nosys_args *)uap, retval);
   };
   
   int
   msgget(p, uap, retval)
           struct proc *p;
           register struct msgget_args *uap;
           int *retval;
   {
           sysv_nosys(p, "SYSVMSG");
           return nosys(p, (struct nosys_args *)uap, retval);
   };
   
   int
   msgsnd(p, uap, retval)
           struct proc *p;
           register struct msgsnd_args *uap;
           int *retval;
   {
           sysv_nosys(p, "SYSVMSG");
           return nosys(p, (struct nosys_args *)uap, retval);
   };
   
   int
   msgrcv(p, uap, retval)
           struct proc *p;
           register struct msgrcv_args *uap;
           int *retval;
   {
           sysv_nosys(p, "SYSVMSG");
           return nosys(p, (struct nosys_args *)uap, retval);
   };
   
   #endif /* !defined(SYSVMSG) */
   
   
   #if !defined(SYSVSHM)
   
   /*
    * SYSVSHM stubs
    */
   
   int
   shmdt(p, uap, retval)
           struct proc *p;
           struct shmdt_args *uap;
           int *retval;
   {
           sysv_nosys(p, "SYSVSHM");
           return nosys(p, (struct nosys_args *)uap, retval);
   };
   
   int
   shmat(p, uap, retval)
           struct proc *p;
           struct shmat_args *uap;
           int *retval;
   {
           sysv_nosys(p, "SYSVSHM");
           return nosys(p, (struct nosys_args *)uap, retval);
   };
   
   int
   shmctl(p, uap, retval)
           struct proc *p;
           struct shmctl_args *uap;
           int *retval;
   {
           sysv_nosys(p, "SYSVSHM");
           return nosys(p, (struct nosys_args *)uap, retval);
   };
   
   int
   shmget(p, uap, retval)
           struct proc *p;
           struct shmget_args *uap;
           int *retval;
   {
           sysv_nosys(p, "SYSVSHM");
           return nosys(p, (struct nosys_args *)uap, retval);
   };
   
   int
   shmsys(p, uap, retval)
           struct proc *p;
           /* XXX actually varargs. */
           struct shmsys_args *uap;
           int *retval;
   {
           sysv_nosys(p, "SYSVSHM");
           return nosys(p, (struct nosys_args *)uap, retval);
   };
   
   /* called from kern_fork.c */
   void
   shmfork(p1, p2)
           struct proc *p1, *p2;
   {
           return;
   }
   
   /* called from kern_exit.c */
   void
   shmexit(p)
           struct proc *p;
   {
           return;
   }
   
   #endif /* !defined(SYSVSHM) */
   
   #endif /* !defined(SYSVSEM) || !defined(SYSVSHM) || !defined(SYSVMSG) */

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