FreeBSD/Linux Kernel Cross Reference
sys/emulation/linux/linux_ipc.c

     /*-
      * Copyright (c) 1994-1995 Søren Schmidt
      * 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 
     *    in this position and unchanged.
     * 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. The name of the author 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.
     *
     * $FreeBSD: src/sys/compat/linux/linux_ipc.c,v 1.17.2.3 2001/11/05 19:08:22 marcel Exp $
     * $DragonFly: src/sys/emulation/linux/linux_ipc.c,v 1.8 2006/06/05 07:26:09 dillon Exp $
     */
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/sysproto.h>
    #include <sys/proc.h>
    #include <sys/msg.h>
    #include <sys/sem.h>
    #include <sys/shm.h>
    
    #include <arch_linux/linux.h>
    #include <machine/limits.h>
    #include <arch_linux/linux_proto.h>
    #include "linux_ipc.h"
    #include "linux_util.h"
    
    
    static void
    bsd_to_linux_shminfo( struct shminfo *bpp, struct l_shminfo *lpp)
    {
            lpp->shmmax = bpp->shmmax;
            lpp->shmmin = bpp->shmmin;
            lpp->shmmni = bpp->shmmni;
            lpp->shmseg = bpp->shmseg;
            lpp->shmall = bpp->shmall;
    }
    
    #if 0
    static void
    bsd_to_linux_shm_info( struct shm_info *bpp, struct l_shm_info *lpp)
    {
            lpp->used_ids = bpp->used_ids ;
            lpp->shm_tot = bpp->shm_tot ;
            lpp->shm_rss = bpp->shm_rss ;
            lpp->shm_swp = bpp->shm_swp ;
            lpp->swap_attempts = bpp->swap_attempts ;
            lpp->swap_successes = bpp->swap_successes ;
    }
    #endif
    
    /*
     * MPSAFE
     */
    static void
    linux_to_bsd_ipc_perm(struct l_ipc_perm *lpp, struct ipc_perm *bpp)
    {
        bpp->key = lpp->key;
        bpp->uid = lpp->uid;
        bpp->gid = lpp->gid;
        bpp->cuid = lpp->cuid;
        bpp->cgid = lpp->cgid;
        bpp->mode = lpp->mode;
        bpp->seq = lpp->seq;
    }
    
    /*
     * MPSAFE
     */
    static void
    bsd_to_linux_ipc_perm(struct ipc_perm *bpp, struct l_ipc_perm *lpp)
    {
        lpp->key = bpp->key;
        lpp->uid = bpp->uid;
        lpp->gid = bpp->gid;
        lpp->cuid = bpp->cuid;
        lpp->cgid = bpp->cgid;
        lpp->mode = bpp->mode;
        lpp->seq = bpp->seq;
    }
    
   /*
    * MPSAFE
    */
   static void
   linux_to_bsd_semid_ds(struct l_semid_ds *lsp, struct semid_ds *bsp)
   {
       linux_to_bsd_ipc_perm(&lsp->sem_perm, &bsp->sem_perm);
       bsp->sem_otime = lsp->sem_otime;
       bsp->sem_ctime = lsp->sem_ctime;
       bsp->sem_nsems = lsp->sem_nsems;
       bsp->sem_base = lsp->sem_base;
   }
   
   /*
    * MPSAFE
    */
   static void
   bsd_to_linux_semid_ds(struct semid_ds *bsp, struct l_semid_ds *lsp)
   {
           bsd_to_linux_ipc_perm(&bsp->sem_perm, &lsp->sem_perm);
           lsp->sem_otime = bsp->sem_otime;
           lsp->sem_ctime = bsp->sem_ctime;
           lsp->sem_nsems = bsp->sem_nsems;
           lsp->sem_base = bsp->sem_base;
   }
   
   /*
    * MPSAFE
    */
   static void
   linux_to_bsd_shmid_ds(struct l_shmid_ds *lsp, struct shmid_ds *bsp)
   {
       linux_to_bsd_ipc_perm(&lsp->shm_perm, &bsp->shm_perm);
       bsp->shm_segsz = lsp->shm_segsz;
       bsp->shm_lpid = lsp->shm_lpid;
       bsp->shm_cpid = lsp->shm_cpid;
       bsp->shm_nattch = lsp->shm_nattch;
       bsp->shm_atime = lsp->shm_atime;
       bsp->shm_dtime = lsp->shm_dtime;
       bsp->shm_ctime = lsp->shm_ctime;
   }
   
   /*
    * MPSAFE
    */
   static void
   bsd_to_linux_shmid_ds(struct shmid_ds *bsp, struct l_shmid_ds *lsp)
   {
       bsd_to_linux_ipc_perm(&bsp->shm_perm, &lsp->shm_perm);
       if (bsp->shm_segsz > INT_MAX)
               lsp->shm_segsz = INT_MAX;
       else
               lsp->shm_segsz = bsp->shm_segsz;
       lsp->shm_lpid = bsp->shm_lpid;
       lsp->shm_cpid = bsp->shm_cpid;
       lsp->shm_nattch = bsp->shm_nattch;
       lsp->shm_atime = bsp->shm_atime;
       lsp->shm_dtime = bsp->shm_dtime;
       lsp->shm_ctime = bsp->shm_ctime;
       lsp->private3 = 0;
   }
   
   static void
   linux_to_bsd_msqid_ds(struct l_msqid_ds *lsp, struct msqid_ds *bsp)
   {
       linux_to_bsd_ipc_perm(&lsp->msg_perm, &bsp->msg_perm);
       bsp->msg_cbytes = lsp->msg_cbytes;
       bsp->msg_qnum = lsp->msg_qnum;
       bsp->msg_qbytes = lsp->msg_qbytes;
       bsp->msg_lspid = lsp->msg_lspid;
       bsp->msg_lrpid = lsp->msg_lrpid;
       bsp->msg_stime = lsp->msg_stime;
       bsp->msg_rtime = lsp->msg_rtime;
       bsp->msg_ctime = lsp->msg_ctime;
   }
   
   static void
   bsd_to_linux_msqid_ds(struct msqid_ds *bsp, struct l_msqid_ds *lsp)
   {
       bsd_to_linux_ipc_perm(&bsp->msg_perm, &lsp->msg_perm);
       lsp->msg_cbytes = bsp->msg_cbytes;
       lsp->msg_qnum = bsp->msg_qnum;
       lsp->msg_qbytes = bsp->msg_qbytes;
       lsp->msg_lspid = bsp->msg_lspid;
       lsp->msg_lrpid = bsp->msg_lrpid;
       lsp->msg_stime = bsp->msg_stime;
       lsp->msg_rtime = bsp->msg_rtime;
       lsp->msg_ctime = bsp->msg_ctime;
   }
   
   static void
   linux_ipc_perm_to_ipc64_perm(struct l_ipc_perm *in, struct l_ipc64_perm *out)
   {
   
           /* XXX: do we really need to do something here? */
           out->key = in->key;
           out->uid = in->uid;
           out->gid = in->gid;
           out->cuid = in->cuid;
           out->cgid = in->cgid;
           out->mode = in->mode;
           out->seq = in->seq;
   }
   
   static int
   linux_msqid_pullup(l_int ver, struct l_msqid_ds *linux_msqid, caddr_t uaddr)
   {
           struct l_msqid64_ds linux_msqid64;
           int error;
   
           if (ver == LINUX_IPC_64) {
                   error = copyin(uaddr, &linux_msqid64, sizeof(linux_msqid64));
                   if (error != 0)
                           return (error);
   
                   bzero(linux_msqid, sizeof(*linux_msqid));
   
                   linux_msqid->msg_perm.uid = linux_msqid64.msg_perm.uid;
                   linux_msqid->msg_perm.gid = linux_msqid64.msg_perm.gid;
                   linux_msqid->msg_perm.mode = linux_msqid64.msg_perm.mode;
   
                   if (linux_msqid64.msg_qbytes > USHRT_MAX)
                           linux_msqid->msg_lqbytes = linux_msqid64.msg_qbytes;
                   else
                           linux_msqid->msg_qbytes = linux_msqid64.msg_qbytes;
           } else {
                   error = copyin(uaddr, linux_msqid, sizeof(*linux_msqid));
           }
           return (error);
   }
   
   static int
   linux_msqid_pushdown(l_int ver, struct l_msqid_ds *linux_msqid, caddr_t uaddr)
   {
           struct l_msqid64_ds linux_msqid64;
   
           if (ver == LINUX_IPC_64) {
                   bzero(&linux_msqid64, sizeof(linux_msqid64));
   
                   linux_ipc_perm_to_ipc64_perm(&linux_msqid->msg_perm,
                       &linux_msqid64.msg_perm);
   
                   linux_msqid64.msg_stime = linux_msqid->msg_stime;
                   linux_msqid64.msg_rtime = linux_msqid->msg_rtime;
                   linux_msqid64.msg_ctime = linux_msqid->msg_ctime;
   
                   if (linux_msqid->msg_cbytes == 0)
                           linux_msqid64.msg_cbytes = linux_msqid->msg_lcbytes;
                   else
                           linux_msqid64.msg_cbytes = linux_msqid->msg_cbytes;
   
                   linux_msqid64.msg_qnum = linux_msqid->msg_qnum;
   
                   if (linux_msqid->msg_qbytes == 0)
                           linux_msqid64.msg_qbytes = linux_msqid->msg_lqbytes;
                   else
                           linux_msqid64.msg_qbytes = linux_msqid->msg_qbytes;
   
                   linux_msqid64.msg_lspid = linux_msqid->msg_lspid;
                   linux_msqid64.msg_lrpid = linux_msqid->msg_lrpid;
   
                   return (copyout(&linux_msqid64, uaddr, sizeof(linux_msqid64)));
           } else {
                   return (copyout(linux_msqid, uaddr, sizeof(*linux_msqid)));
           }
   }
   
   static int
   linux_semid_pullup(l_int ver, struct l_semid_ds *linux_semid, caddr_t uaddr)
   {
           struct l_semid64_ds linux_semid64;
           int error;
   
           if (ver == LINUX_IPC_64) {
                   error = copyin(uaddr, &linux_semid64, sizeof(linux_semid64));
                   if (error != 0)
                           return (error);
   
                   bzero(linux_semid, sizeof(*linux_semid));
   
                   linux_semid->sem_perm.uid = linux_semid64.sem_perm.uid;
                   linux_semid->sem_perm.gid = linux_semid64.sem_perm.gid;
                   linux_semid->sem_perm.mode = linux_semid64.sem_perm.mode;
           } else {
                   error = copyin(uaddr, linux_semid, sizeof(*linux_semid));
           }
           return (error);
   }
   
   static int
   linux_semid_pushdown(l_int ver, struct l_semid_ds *linux_semid, caddr_t uaddr)
   {
           struct l_semid64_ds linux_semid64;
   
           if (ver == LINUX_IPC_64) {
                   bzero(&linux_semid64, sizeof(linux_semid64));
   
                   linux_ipc_perm_to_ipc64_perm(&linux_semid->sem_perm,
                       &linux_semid64.sem_perm);
   
                   linux_semid64.sem_otime = linux_semid->sem_otime;
                   linux_semid64.sem_ctime = linux_semid->sem_ctime;
                   linux_semid64.sem_nsems = linux_semid->sem_nsems;
   
                   return (copyout(&linux_semid64, uaddr, sizeof(linux_semid64)));
           } else {
                   return (copyout(linux_semid, uaddr, sizeof(*linux_semid)));
           }
   }
   
   static int
   linux_shmid_pullup(l_int ver, struct l_shmid_ds *linux_shmid, caddr_t uaddr)
   {
           struct l_shmid64_ds linux_shmid64;
           int error;
   
           if (ver == LINUX_IPC_64) {
                   error = copyin(uaddr, &linux_shmid64, sizeof(linux_shmid64));
                   if (error != 0)
                           return (error);
   
                   bzero(linux_shmid, sizeof(*linux_shmid));
   
                   linux_shmid->shm_perm.uid = linux_shmid64.shm_perm.uid;
                   linux_shmid->shm_perm.gid = linux_shmid64.shm_perm.gid;
                   linux_shmid->shm_perm.mode = linux_shmid64.shm_perm.mode;
           } else {
                   error = copyin(uaddr, linux_shmid, sizeof(*linux_shmid));
           }
           return (error);
   }
   
   static int
   linux_shmid_pushdown(l_int ver, struct l_shmid_ds *linux_shmid, caddr_t uaddr)
   {
           struct l_shmid64_ds linux_shmid64;
   
           /*
            * XXX: This is backwards and loses information in shm_nattch
            * and shm_segsz.  We should probably either expose the BSD
            * shmid structure directly and convert it to either the
            * non-64 or 64 variant directly or the code should always
            * convert to the 64 variant and then truncate values into the
            * non-64 variant if needed since the 64 variant has more
            * precision.
            */
           if (ver == LINUX_IPC_64) {
                   bzero(&linux_shmid64, sizeof(linux_shmid64));
   
                   linux_ipc_perm_to_ipc64_perm(&linux_shmid->shm_perm,
                       &linux_shmid64.shm_perm);
   
                   linux_shmid64.shm_segsz = linux_shmid->shm_segsz;
                   linux_shmid64.shm_atime = linux_shmid->shm_atime;
                   linux_shmid64.shm_dtime = linux_shmid->shm_dtime;
                   linux_shmid64.shm_ctime = linux_shmid->shm_ctime;
                   linux_shmid64.shm_cpid = linux_shmid->shm_cpid;
                   linux_shmid64.shm_lpid = linux_shmid->shm_lpid;
                   linux_shmid64.shm_nattch = linux_shmid->shm_nattch;
   
                   return (copyout(&linux_shmid64, uaddr, sizeof(linux_shmid64)));
           } else {
                   return (copyout(linux_shmid, uaddr, sizeof(*linux_shmid)));
           }
   }
   
   static int
   linux_shminfo_pushdown(l_int ver, struct l_shminfo *linux_shminfo,
       caddr_t uaddr)
   {
           struct l_shminfo64 linux_shminfo64;
   
           if (ver == LINUX_IPC_64) {
                   bzero(&linux_shminfo64, sizeof(linux_shminfo64));
   
                   linux_shminfo64.shmmax = linux_shminfo->shmmax;
                   linux_shminfo64.shmmin = linux_shminfo->shmmin;
                   linux_shminfo64.shmmni = linux_shminfo->shmmni;
                   linux_shminfo64.shmseg = linux_shminfo->shmseg;
                   linux_shminfo64.shmall = linux_shminfo->shmall;
   
                   return (copyout(&linux_shminfo64, uaddr,
                       sizeof(linux_shminfo64)));
           } else {
                   return (copyout(linux_shminfo, uaddr, sizeof(*linux_shminfo)));
           }
   }
   
   /*
    * MPSAFE
    */
   int
   linux_semop(struct linux_semop_args *args)
   {
           struct semop_args bsd_args;
           int error;
   
           bsd_args.sysmsg_result = 0;
           bsd_args.semid = args->semid;
           bsd_args.sops = (struct sembuf *)args->tsops;
           bsd_args.nsops = args->nsops;
           error = sys_semop(&bsd_args);
           args->sysmsg_result = bsd_args.sysmsg_result;
           return(error);
   }
   
   /*
    * MPSAFE
    */
   int
   linux_semget(struct linux_semget_args *args)
   {
           struct semget_args bsd_args;
           int error;
   
           bsd_args.sysmsg_result = 0;
           bsd_args.key = args->key;
           bsd_args.nsems = args->nsems;
           bsd_args.semflg = args->semflg;
           error = sys_semget(&bsd_args);
           args->sysmsg_result = bsd_args.sysmsg_result;
           return(error);
   }
   
   /*
    * MPSAFE
    */
   int
   linux_semctl(struct linux_semctl_args *args)
   {
           struct l_semid_ds linux_semid;
           struct __semctl_args bsd_args;
           struct l_seminfo linux_seminfo;
           int error;
           union semun *unptr;
           caddr_t sg;
   
           sg = stackgap_init();
   
           /* Make sure the arg parameter can be copied in. */
           unptr = stackgap_alloc(&sg, sizeof(union semun));
           bcopy(&args->arg, unptr, sizeof(union semun));
   
           bsd_args.sysmsg_result = 0;
           bsd_args.semid = args->semid;
           bsd_args.semnum = args->semnum;
           bsd_args.arg = unptr;
   
           switch (args->cmd & ~LINUX_IPC_64) {
           case LINUX_IPC_RMID:
                   bsd_args.cmd = IPC_RMID;
                   break;
           case LINUX_GETNCNT:
                   bsd_args.cmd = GETNCNT;
                   break;
           case LINUX_GETPID:
                   bsd_args.cmd = GETPID;
                   break;
           case LINUX_GETVAL:
                   bsd_args.cmd = GETVAL;
                   break;
           case LINUX_GETZCNT:
                   bsd_args.cmd = GETZCNT;
                   break;
           case LINUX_SETVAL:
                   bsd_args.cmd = SETVAL;
                   break;
           case LINUX_IPC_SET:
                   bsd_args.cmd = IPC_SET;
                   error = linux_semid_pullup(args->cmd & LINUX_IPC_64,
                       &linux_semid, (caddr_t)args->arg.buf);
                   if (error)
                           return (error);
                   unptr->buf = stackgap_alloc(&sg, sizeof(struct semid_ds));
                   linux_to_bsd_semid_ds(&linux_semid, unptr->buf);
                   break;
           case LINUX_IPC_STAT:
           case LINUX_SEM_STAT:
                   if ((args->cmd & ~LINUX_IPC_64) == LINUX_IPC_STAT)
                           bsd_args.cmd = IPC_STAT;
                   else
                           bsd_args.cmd = SEM_STAT;
                   unptr->buf = stackgap_alloc(&sg, sizeof(struct semid_ds));
                   error = sys___semctl(&bsd_args);
                   if (error)
                           return error;
                   args->sysmsg_result = IXSEQ_TO_IPCID(bsd_args.semid, 
                                                           unptr->buf->sem_perm);
                   bsd_to_linux_semid_ds(unptr->buf, &linux_semid);
                   error = linux_semid_pushdown(args->cmd & LINUX_IPC_64,
                       &linux_semid, (caddr_t)(args->arg.buf));
                   if (error == 0)
                           args->sysmsg_iresult = ((args->cmd & ~LINUX_IPC_64) == SEM_STAT)
                               ? bsd_args.sysmsg_result : 0;
                   return (error);
           case LINUX_IPC_INFO:
           case LINUX_SEM_INFO:
                   error = copyin((caddr_t)args->arg.buf, &linux_seminfo, 
                                                   sizeof(linux_seminfo) );
                   if (error)
                           return error;
                   bcopy(&seminfo, &linux_seminfo, sizeof(linux_seminfo) );
   /* XXX BSD equivalent?
   #define used_semids 10
   #define used_sems 10
                   linux_seminfo.semusz = used_semids;
                   linux_seminfo.semaem = used_sems;
   */
                   error = copyout((caddr_t)&linux_seminfo, (caddr_t)args->arg.buf,
                                                   sizeof(linux_seminfo) );
                   if (error)
                           return error;
                   args->sysmsg_result = seminfo.semmni;
                   return 0;                       /* No need for __semctl call */
           case LINUX_GETALL:
                   bsd_args.cmd = GETALL;
                   break;
           case LINUX_SETALL:
                   bsd_args.cmd = SETALL;
                   break;
           default:
                   uprintf("linux: 'ipc' type=%d not implemented\n", args->cmd & ~LINUX_IPC_64);
                   return EINVAL;
           }
           error = sys___semctl(&bsd_args);
           args->sysmsg_result = bsd_args.sysmsg_result;
           return(error);
   }
   
   /*
    * MPSAFE
    */
   int
   linux_msgsnd(struct linux_msgsnd_args *args)
   {
       struct msgsnd_args bsd_args;
       int error;
   
       if ((l_long)args->msgsz < 0 || args->msgsz > (l_long)msginfo.msgmax)
           return (EINVAL);
       bsd_args.sysmsg_result = 0;
       bsd_args.msqid = args->msqid;
       bsd_args.msgp = args->msgp;
       bsd_args.msgsz = args->msgsz;
       bsd_args.msgflg = args->msgflg;
       error = sys_msgsnd(&bsd_args);
       args->sysmsg_result = bsd_args.sysmsg_result;
       return(error);
   }
   
   /*
    * MPSAFE
    */
   int
   linux_msgrcv(struct linux_msgrcv_args *args)
   {
       struct msgrcv_args bsd_args; 
       int error;
       if ((l_long)args->msgsz < 0 || args->msgsz > (l_long)msginfo.msgmax)
               return (EINVAL);
       bsd_args.sysmsg_result = 0;
       bsd_args.msqid = args->msqid;
       bsd_args.msgp = args->msgp;
       bsd_args.msgsz = args->msgsz;
       bsd_args.msgtyp = 0; /* XXX - args->msgtyp; */
       bsd_args.msgflg = args->msgflg;
       error = sys_msgrcv(&bsd_args);
       args->sysmsg_result = bsd_args.sysmsg_result;
       return(error);
   }
   
   /*
    * MPSAFE
    */
   int
   linux_msgget(struct linux_msgget_args *args)
   {
       struct msgget_args bsd_args;
       int error;
   
       bsd_args.sysmsg_result = 0;
       bsd_args.key = args->key;
       bsd_args.msgflg = args->msgflg;
       error = sys_msgget(&bsd_args);
       args->sysmsg_result = bsd_args.sysmsg_result;
       return(error);
   }
   
   /*
    * MPSAFE
    */
   int
   linux_msgctl(struct linux_msgctl_args *args)
   {
       struct msgctl_args bsd_args;
       struct l_msqid_ds linux_msqid;
       int error, bsd_cmd;
       struct msqid_ds *unptr;
       caddr_t sg;
      
      sg = stackgap_init();
           /* Make sure the arg parameter can be copied in. */
           unptr = stackgap_alloc(&sg, sizeof(struct msqid_ds));
           bcopy(&args->buf, unptr, sizeof(struct msqid_ds));
   
       bsd_cmd = args->cmd & ~LINUX_IPC_64;
       bsd_args.sysmsg_result = 0;
       bsd_args.msqid = args->msqid;
       bsd_args.cmd = bsd_cmd;
       bsd_args.buf = unptr;
       switch(bsd_cmd) {
       case LINUX_IPC_INFO:
       case LINUX_MSG_INFO: {
           struct l_msginfo linux_msginfo;
   
           /*
            * XXX MSG_INFO uses the same data structure but returns different
            * dynamic counters in msgpool, msgmap, and msgtql fields.
            */
           linux_msginfo.msgpool = (long)msginfo.msgmni *
               (long)msginfo.msgmnb / 1024L;       /* XXX MSG_INFO. */
           linux_msginfo.msgmap = msginfo.msgmnb;  /* XXX MSG_INFO. */
           linux_msginfo.msgmax = msginfo.msgmax;
           linux_msginfo.msgmnb = msginfo.msgmnb;
           linux_msginfo.msgmni = msginfo.msgmni;
           linux_msginfo.msgssz = msginfo.msgssz;
           linux_msginfo.msgtql = msginfo.msgtql;  /* XXX MSG_INFO. */
           linux_msginfo.msgseg = msginfo.msgseg;
           error = copyout(&linux_msginfo, PTRIN(args->buf),
               sizeof(linux_msginfo));
           if (error == 0)
               args->sysmsg_iresult = msginfo.msgmni;      /* XXX */
   
           return (error);
       }
   
   /*
    * TODO: implement this
    * case LINUX_MSG_STAT:
    */
       case LINUX_IPC_STAT:
           /* NOTHING */
           break;
   
       case LINUX_IPC_SET:
           error = linux_msqid_pullup(args->cmd & LINUX_IPC_64,
               &linux_msqid, (caddr_t)(args->buf));
           if (error)
               return (error);
           linux_to_bsd_msqid_ds(&linux_msqid, unptr);
           break;
   
       case LINUX_IPC_RMID:
           /* NOTHING */
           break;
   
       default:
           return (EINVAL);
           break;
       }
   
       error = sys_msgctl(&bsd_args);
       if (error != 0)
           if (bsd_cmd != LINUX_IPC_RMID || error != EINVAL)
               return (error);
       if (bsd_cmd == LINUX_IPC_STAT) {
           bsd_to_linux_msqid_ds(bsd_args.buf, &linux_msqid);
           return (linux_msqid_pushdown(args->cmd & LINUX_IPC_64,
             &linux_msqid, PTRIN(args->buf)));
       }
       args->sysmsg_result = bsd_args.sysmsg_result;
       return ((args->cmd == LINUX_IPC_RMID && error == EINVAL) ? 0 : error);
   
   
   
   
   }
   
   /*
    * MPSAFE
    */
   int
   linux_shmat(struct linux_shmat_args *args)
   {
       struct shmat_args bsd_args;
       int error;
   
       bsd_args.sysmsg_result = 0;
       bsd_args.shmid = args->shmid;
       bsd_args.shmaddr = args->shmaddr;
       bsd_args.shmflg = args->shmflg;
       if ((error = sys_shmat(&bsd_args)))
           return error;
   #ifdef __i386__
       if ((error = copyout(&bsd_args.sysmsg_lresult, (caddr_t)args->raddr, sizeof(l_ulong))))
           return error;
       args->sysmsg_result = 0;
   #else
       args->sysmsg_result = bsd_args.sysmsg_result;
   #endif
       return 0;
   }
   
   /*
    * MPSAFE
    */
   int
   linux_shmdt(struct linux_shmdt_args *args)
   {
       struct shmdt_args bsd_args;
       int error;
   
       bsd_args.sysmsg_result = 0;
       bsd_args.shmaddr = args->shmaddr;
       error = sys_shmdt(&bsd_args);
       args->sysmsg_result = bsd_args.sysmsg_result;
       return(error);
   }
   
   /*
    * MPSAFE
    */
   int
   linux_shmget(struct linux_shmget_args *args)
   {
       struct shmget_args bsd_args;
       int error;
   
       bsd_args.sysmsg_result = 0;
       bsd_args.key = args->key;
       bsd_args.size = args->size;
       bsd_args.shmflg = args->shmflg;
       error = sys_shmget(&bsd_args);
       args->sysmsg_result = bsd_args.sysmsg_result;
       return(error);
   }
   
   /*
    * MPSAFE
    */
   extern int shm_nused;
   int
   linux_shmctl(struct linux_shmctl_args *args)
   {
       struct l_shmid_ds linux_shmid;
       struct l_shminfo linux_shminfo;
       struct l_shm_info linux_shm_info;
       struct shmctl_args bsd_args;
       int error;
       caddr_t sg = stackgap_init();
   
       bsd_args.sysmsg_result = 0;
       switch (args->cmd & ~LINUX_IPC_64) {
       case LINUX_IPC_STAT:
       case LINUX_SHM_STAT:
           bsd_args.shmid = args->shmid;
           bsd_args.cmd = IPC_STAT;
           bsd_args.buf = (struct shmid_ds*)stackgap_alloc(&sg, sizeof(struct shmid_ds));
           if ((error = sys_shmctl(&bsd_args)))
               return error;
           bsd_to_linux_shmid_ds(bsd_args.buf, &linux_shmid);
           args->sysmsg_result = bsd_args.sysmsg_result;
           return (linux_shmid_pushdown(args->cmd & LINUX_IPC_64,
                &linux_shmid, PTRIN(args->buf)));
   
       case LINUX_IPC_SET:
           if ((error = linux_shmid_pullup(args->cmd & LINUX_IPC_64,
             &linux_shmid, PTRIN(args->buf))))
               return error;
           bsd_args.buf = (struct shmid_ds*)stackgap_alloc(&sg, sizeof(struct shmid_ds));
           linux_to_bsd_shmid_ds(&linux_shmid, bsd_args.buf);
           bsd_args.shmid = args->shmid;
           bsd_args.cmd = IPC_SET;
           break;
       case LINUX_IPC_RMID:
           bsd_args.shmid = args->shmid;
           bsd_args.cmd = IPC_RMID;
           if (args->buf == NULL)
               bsd_args.buf = NULL;
           else {
               if ((error = linux_shmid_pullup(args->cmd & LINUX_IPC_64,
                       &linux_shmid, PTRIN(args->buf))))
                   return error;
               bsd_args.buf = (struct shmid_ds*)stackgap_alloc(&sg, sizeof(struct shmid_ds));
               linux_to_bsd_shmid_ds(&linux_shmid, bsd_args.buf);
           }
           break;
       case LINUX_IPC_INFO:
           bsd_to_linux_shminfo(&shminfo, &linux_shminfo);
           return (linux_shminfo_pushdown(args->cmd & LINUX_IPC_64,
               &linux_shminfo, PTRIN(args->buf)));
           break;
       case LINUX_SHM_INFO:
           linux_shm_info.used_ids = shm_nused;
           linux_shm_info.shm_tot = 0;
           linux_shm_info.shm_rss = 0;
           linux_shm_info.shm_swp = 0;
           linux_shm_info.swap_attempts = 0;
           linux_shm_info.swap_successes = 0;
           return copyout(&linux_shm_info, PTRIN(args->buf),
               sizeof(struct l_shm_info));
       
       case LINUX_SHM_LOCK:
       case LINUX_SHM_UNLOCK:
       default:
           uprintf("linux: 'ipc' type=%d not implemented\n", args->cmd & ~LINUX_IPC_64);
           return EINVAL;
       }
       error = sys_shmctl(&bsd_args);
       args->sysmsg_result = bsd_args.sysmsg_result;
       return(error);
   }

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