The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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

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    1 /*-
    2  * Copyright (c) 1994-1995 Søren Schmidt
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer
   10  *    in this position and unchanged.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  * 3. The name of the author may not be used to endorse or promote products
   15  *    derived from this software without specific prior written permission
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   27  *
   28  * $FreeBSD: releng/5.1/sys/compat/linux/linux_ipc.c 114724 2003-05-05 09:22:58Z mbr $
   29  */
   30 
   31 #include <sys/param.h>
   32 #include <sys/systm.h>
   33 #include <sys/syscallsubr.h>
   34 #include <sys/sysproto.h>
   35 #include <sys/proc.h>
   36 #include <sys/limits.h>
   37 #include <sys/msg.h>
   38 #include <sys/sem.h>
   39 #include <sys/shm.h>
   40 
   41 #include <machine/../linux/linux.h>
   42 #include <machine/../linux/linux_proto.h>
   43 #include <machine/../linux/linux_ipc64.h>
   44 #include <compat/linux/linux_ipc.h>
   45 #include <compat/linux/linux_util.h>
   46 
   47 struct l_seminfo {
   48         l_int semmap;
   49         l_int semmni;
   50         l_int semmns;
   51         l_int semmnu;
   52         l_int semmsl;
   53         l_int semopm;
   54         l_int semume;
   55         l_int semusz;
   56         l_int semvmx;
   57         l_int semaem;
   58 };
   59 
   60 struct l_shminfo {
   61         l_int shmmax;
   62         l_int shmmin;
   63         l_int shmmni;
   64         l_int shmseg;
   65         l_int shmall;
   66 };
   67 
   68 struct l_shm_info {
   69         l_int used_ids;
   70         l_ulong shm_tot;  /* total allocated shm */
   71         l_ulong shm_rss;  /* total resident shm */
   72         l_ulong shm_swp;  /* total swapped shm */
   73         l_ulong swap_attempts;
   74         l_ulong swap_successes;
   75 };
   76 
   77 static void
   78 bsd_to_linux_shminfo( struct shminfo *bpp, struct l_shminfo *lpp)
   79 {
   80         lpp->shmmax = bpp->shmmax;
   81         lpp->shmmin = bpp->shmmin;
   82         lpp->shmmni = bpp->shmmni;
   83         lpp->shmseg = bpp->shmseg;
   84         lpp->shmall = bpp->shmall;
   85 }
   86 
   87 static void
   88 bsd_to_linux_shm_info( struct shm_info *bpp, struct l_shm_info *lpp)
   89 {
   90         lpp->used_ids = bpp->used_ids ;
   91         lpp->shm_tot = bpp->shm_tot ;
   92         lpp->shm_rss = bpp->shm_rss ;
   93         lpp->shm_swp = bpp->shm_swp ;
   94         lpp->swap_attempts = bpp->swap_attempts ;
   95         lpp->swap_successes = bpp->swap_successes ;
   96 }
   97 
   98 struct l_ipc_perm {
   99         l_key_t         key;
  100         l_uid16_t       uid;
  101         l_gid16_t       gid;
  102         l_uid16_t       cuid;
  103         l_gid16_t       cgid;
  104         l_ushort        mode;
  105         l_ushort        seq;
  106 };
  107 
  108 static void
  109 linux_to_bsd_ipc_perm(struct l_ipc_perm *lpp, struct ipc_perm *bpp)
  110 {
  111     bpp->key = lpp->key;
  112     bpp->uid = lpp->uid;
  113     bpp->gid = lpp->gid;
  114     bpp->cuid = lpp->cuid;
  115     bpp->cgid = lpp->cgid;
  116     bpp->mode = lpp->mode;
  117     bpp->seq = lpp->seq;
  118 }
  119 
  120 
  121 static void
  122 bsd_to_linux_ipc_perm(struct ipc_perm *bpp, struct l_ipc_perm *lpp)
  123 {
  124     lpp->key = bpp->key;
  125     lpp->uid = bpp->uid;
  126     lpp->gid = bpp->gid;
  127     lpp->cuid = bpp->cuid;
  128     lpp->cgid = bpp->cgid;
  129     lpp->mode = bpp->mode;
  130     lpp->seq = bpp->seq;
  131 }
  132 
  133 struct l_msqid_ds {
  134         struct l_ipc_perm       msg_perm;
  135         struct l_msg            *msg_first;     /* first message on queue,unused */
  136         struct l_msg            *msg_last;      /* last message in queue,unused */
  137         l_time_t                msg_stime;      /* last msgsnd time */
  138         l_time_t                msg_rtime;      /* last msgrcv time */
  139         l_time_t                msg_ctime;      /* last change time */
  140         l_ulong                 msg_lcbytes;    /* Reuse junk fields for 32 bit */
  141         l_ulong                 msg_lqbytes;    /* ditto */
  142         l_ushort                msg_cbytes;     /* current number of bytes on queue */
  143         l_ushort                msg_qnum;       /* number of messages in queue */
  144         l_ushort                msg_qbytes;     /* max number of bytes on queue */
  145         l_pid_t                 msg_lspid;      /* pid of last msgsnd */
  146         l_pid_t                 msg_lrpid;      /* last receive pid */
  147 };
  148 
  149 struct l_semid_ds {
  150         struct l_ipc_perm       sem_perm;
  151         l_time_t                sem_otime;
  152         l_time_t                sem_ctime;
  153         void                    *sem_base;
  154         void                    *sem_pending;
  155         void                    *sem_pending_last;
  156         void                    *undo;
  157         l_ushort                sem_nsems;
  158 };
  159 
  160 struct l_shmid_ds {
  161         struct l_ipc_perm       shm_perm;
  162         l_int                   shm_segsz;
  163         l_time_t                shm_atime;
  164         l_time_t                shm_dtime;
  165         l_time_t                shm_ctime;
  166         l_ushort                shm_cpid;
  167         l_ushort                shm_lpid;
  168         l_short                 shm_nattch;
  169         l_ushort                private1;
  170         void                    *private2;
  171         void                    *private3;
  172 };
  173 
  174 static void
  175 linux_to_bsd_semid_ds(struct l_semid_ds *lsp, struct semid_ds *bsp)
  176 {
  177     linux_to_bsd_ipc_perm(&lsp->sem_perm, &bsp->sem_perm);
  178     bsp->sem_otime = lsp->sem_otime;
  179     bsp->sem_ctime = lsp->sem_ctime;
  180     bsp->sem_nsems = lsp->sem_nsems;
  181     bsp->sem_base = lsp->sem_base;
  182 }
  183 
  184 static void
  185 bsd_to_linux_semid_ds(struct semid_ds *bsp, struct l_semid_ds *lsp)
  186 {
  187         bsd_to_linux_ipc_perm(&bsp->sem_perm, &lsp->sem_perm);
  188         lsp->sem_otime = bsp->sem_otime;
  189         lsp->sem_ctime = bsp->sem_ctime;
  190         lsp->sem_nsems = bsp->sem_nsems;
  191         lsp->sem_base = bsp->sem_base;
  192 }
  193 
  194 static void
  195 linux_to_bsd_shmid_ds(struct l_shmid_ds *lsp, struct shmid_ds *bsp)
  196 {
  197     linux_to_bsd_ipc_perm(&lsp->shm_perm, &bsp->shm_perm);
  198     bsp->shm_segsz = lsp->shm_segsz;
  199     bsp->shm_lpid = lsp->shm_lpid;
  200     bsp->shm_cpid = lsp->shm_cpid;
  201     bsp->shm_nattch = lsp->shm_nattch;
  202     bsp->shm_atime = lsp->shm_atime;
  203     bsp->shm_dtime = lsp->shm_dtime;
  204     bsp->shm_ctime = lsp->shm_ctime;
  205     bsp->shm_internal = lsp->private3;  /* this goes (yet) SOS */
  206 }
  207 
  208 static void
  209 bsd_to_linux_shmid_ds(struct shmid_ds *bsp, struct l_shmid_ds *lsp)
  210 {
  211     bsd_to_linux_ipc_perm(&bsp->shm_perm, &lsp->shm_perm);
  212     lsp->shm_segsz = bsp->shm_segsz;
  213     lsp->shm_lpid = bsp->shm_lpid;
  214     lsp->shm_cpid = bsp->shm_cpid;
  215     lsp->shm_nattch = bsp->shm_nattch;
  216     lsp->shm_atime = bsp->shm_atime;
  217     lsp->shm_dtime = bsp->shm_dtime;
  218     lsp->shm_ctime = bsp->shm_ctime;
  219     lsp->private3 = bsp->shm_internal;  /* this goes (yet) SOS */
  220 }
  221 
  222 static void
  223 linux_to_bsd_msqid_ds(struct l_msqid_ds *lsp, struct msqid_ds *bsp)
  224 {
  225     linux_to_bsd_ipc_perm(&lsp->msg_perm, &bsp->msg_perm);
  226     bsp->msg_cbytes = lsp->msg_cbytes;
  227     bsp->msg_qnum = lsp->msg_qnum;
  228     bsp->msg_qbytes = lsp->msg_qbytes;
  229     bsp->msg_lspid = lsp->msg_lspid;
  230     bsp->msg_lrpid = lsp->msg_lrpid;
  231     bsp->msg_stime = lsp->msg_stime;
  232     bsp->msg_rtime = lsp->msg_rtime;
  233     bsp->msg_ctime = lsp->msg_ctime;
  234 }
  235 
  236 static void
  237 bsd_to_linux_msqid_ds(struct msqid_ds *bsp, struct l_msqid_ds *lsp)
  238 {
  239     bsd_to_linux_ipc_perm(&bsp->msg_perm, &lsp->msg_perm);
  240     lsp->msg_cbytes = bsp->msg_cbytes;
  241     lsp->msg_qnum = bsp->msg_qnum;
  242     lsp->msg_qbytes = bsp->msg_qbytes;
  243     lsp->msg_lspid = bsp->msg_lspid;
  244     lsp->msg_lrpid = bsp->msg_lrpid;
  245     lsp->msg_stime = bsp->msg_stime;
  246     lsp->msg_rtime = bsp->msg_rtime;
  247     lsp->msg_ctime = bsp->msg_ctime;
  248 }
  249 
  250 static void
  251 linux_ipc_perm_to_ipc64_perm(struct l_ipc_perm *in, struct l_ipc64_perm *out)
  252 {
  253 
  254         /* XXX: do we really need to do something here? */
  255         out->key = in->key;
  256         out->uid = in->uid;
  257         out->gid = in->gid;
  258         out->cuid = in->cuid;
  259         out->cgid = in->cgid;
  260         out->mode = in->mode;
  261         out->seq = in->seq;
  262 }
  263 
  264 static int
  265 linux_msqid_pullup(l_int ver, struct l_msqid_ds *linux_msqid, caddr_t uaddr)
  266 {
  267         struct l_msqid64_ds linux_msqid64;
  268         int error;
  269 
  270         if (ver == LINUX_IPC_64) {
  271                 error = copyin(uaddr, &linux_msqid64, sizeof(linux_msqid64));
  272                 if (error != 0)
  273                         return (error);
  274 
  275                 bzero(linux_msqid, sizeof(*linux_msqid));
  276 
  277                 linux_msqid->msg_perm.uid = linux_msqid64.msg_perm.uid;
  278                 linux_msqid->msg_perm.gid = linux_msqid64.msg_perm.gid;
  279                 linux_msqid->msg_perm.mode = linux_msqid64.msg_perm.mode;
  280 
  281                 if (linux_msqid64.msg_qbytes > USHRT_MAX)
  282                         linux_msqid->msg_lqbytes = linux_msqid64.msg_qbytes;
  283                 else
  284                         linux_msqid->msg_qbytes = linux_msqid64.msg_qbytes;
  285         } else {
  286                 error = copyin(uaddr, linux_msqid, sizeof(*linux_msqid));
  287         }
  288         return (error);
  289 }
  290 
  291 static int
  292 linux_msqid_pushdown(l_int ver, struct l_msqid_ds *linux_msqid, caddr_t uaddr)
  293 {
  294         struct l_msqid64_ds linux_msqid64;
  295 
  296         if (ver == LINUX_IPC_64) {
  297                 bzero(&linux_msqid64, sizeof(linux_msqid64));
  298 
  299                 linux_ipc_perm_to_ipc64_perm(&linux_msqid->msg_perm,
  300                     &linux_msqid64.msg_perm);
  301 
  302                 linux_msqid64.msg_stime = linux_msqid->msg_stime;
  303                 linux_msqid64.msg_rtime = linux_msqid->msg_rtime;
  304                 linux_msqid64.msg_ctime = linux_msqid->msg_ctime;
  305 
  306                 if (linux_msqid->msg_cbytes == 0)
  307                         linux_msqid64.msg_cbytes = linux_msqid->msg_lcbytes;
  308                 else
  309                         linux_msqid64.msg_cbytes = linux_msqid->msg_cbytes;
  310 
  311                 linux_msqid64.msg_qnum = linux_msqid->msg_qnum;
  312 
  313                 if (linux_msqid->msg_qbytes == 0)
  314                         linux_msqid64.msg_qbytes = linux_msqid->msg_lqbytes;
  315                 else
  316                         linux_msqid64.msg_qbytes = linux_msqid->msg_qbytes;
  317 
  318                 linux_msqid64.msg_lspid = linux_msqid->msg_lspid;
  319                 linux_msqid64.msg_lrpid = linux_msqid->msg_lrpid;
  320 
  321                 return (copyout(&linux_msqid64, uaddr, sizeof(linux_msqid64)));
  322         } else {
  323                 return (copyout(linux_msqid, uaddr, sizeof(*linux_msqid)));
  324         }
  325 }
  326 
  327 static int
  328 linux_semid_pullup(l_int ver, struct l_semid_ds *linux_semid, caddr_t uaddr)
  329 {
  330         struct l_semid64_ds linux_semid64;
  331         int error;
  332 
  333         if (ver == LINUX_IPC_64) {
  334                 error = copyin(uaddr, &linux_semid64, sizeof(linux_semid64));
  335                 if (error != 0)
  336                         return (error);
  337 
  338                 bzero(linux_semid, sizeof(*linux_semid));
  339 
  340                 linux_semid->sem_perm.uid = linux_semid64.sem_perm.uid;
  341                 linux_semid->sem_perm.gid = linux_semid64.sem_perm.gid;
  342                 linux_semid->sem_perm.mode = linux_semid64.sem_perm.mode;
  343         } else {
  344                 error = copyin(uaddr, linux_semid, sizeof(*linux_semid));
  345         }
  346         return (error);
  347 }
  348 
  349 static int
  350 linux_semid_pushdown(l_int ver, struct l_semid_ds *linux_semid, caddr_t uaddr)
  351 {
  352         struct l_semid64_ds linux_semid64;
  353 
  354         if (ver == LINUX_IPC_64) {
  355                 bzero(&linux_semid64, sizeof(linux_semid64));
  356 
  357                 linux_ipc_perm_to_ipc64_perm(&linux_semid->sem_perm,
  358                     &linux_semid64.sem_perm);
  359 
  360                 linux_semid64.sem_otime = linux_semid->sem_otime;
  361                 linux_semid64.sem_ctime = linux_semid->sem_ctime;
  362                 linux_semid64.sem_nsems = linux_semid->sem_nsems;
  363 
  364                 return (copyout(&linux_semid64, uaddr, sizeof(linux_semid64)));
  365         } else {
  366                 return (copyout(linux_semid, uaddr, sizeof(*linux_semid)));
  367         }
  368 }
  369 
  370 static int
  371 linux_shmid_pullup(l_int ver, struct l_shmid_ds *linux_shmid, caddr_t uaddr)
  372 {
  373         struct l_shmid64_ds linux_shmid64;
  374         int error;
  375 
  376         if (ver == LINUX_IPC_64) {
  377                 error = copyin(uaddr, &linux_shmid64, sizeof(linux_shmid64));
  378                 if (error != 0)
  379                         return (error);
  380 
  381                 bzero(linux_shmid, sizeof(*linux_shmid));
  382 
  383                 linux_shmid->shm_perm.uid = linux_shmid64.shm_perm.uid;
  384                 linux_shmid->shm_perm.gid = linux_shmid64.shm_perm.gid;
  385                 linux_shmid->shm_perm.mode = linux_shmid64.shm_perm.mode;
  386         } else {
  387                 error = copyin(uaddr, linux_shmid, sizeof(*linux_shmid));
  388         }
  389         return (error);
  390 }
  391 
  392 static int
  393 linux_shmid_pushdown(l_int ver, struct l_shmid_ds *linux_shmid, caddr_t uaddr)
  394 {
  395         struct l_shmid64_ds linux_shmid64;
  396 
  397         if (ver == LINUX_IPC_64) {
  398                 bzero(&linux_shmid64, sizeof(linux_shmid64));
  399 
  400                 linux_ipc_perm_to_ipc64_perm(&linux_shmid->shm_perm,
  401                     &linux_shmid64.shm_perm);
  402 
  403                 linux_shmid64.shm_segsz = linux_shmid->shm_segsz;
  404                 linux_shmid64.shm_atime = linux_shmid->shm_atime;
  405                 linux_shmid64.shm_dtime = linux_shmid->shm_dtime;
  406                 linux_shmid64.shm_ctime = linux_shmid->shm_ctime;
  407                 linux_shmid64.shm_cpid = linux_shmid->shm_cpid;
  408                 linux_shmid64.shm_lpid = linux_shmid->shm_lpid;
  409                 linux_shmid64.shm_nattch = linux_shmid->shm_nattch;
  410 
  411                 return (copyout(&linux_shmid64, uaddr, sizeof(linux_shmid64)));
  412         } else {
  413                 return (copyout(linux_shmid, uaddr, sizeof(*linux_shmid)));
  414         }
  415 }
  416 
  417 static int
  418 linux_shminfo_pushdown(l_int ver, struct l_shminfo *linux_shminfo,
  419     caddr_t uaddr)
  420 {
  421         struct l_shminfo64 linux_shminfo64;
  422 
  423         if (ver == LINUX_IPC_64) {
  424                 bzero(&linux_shminfo64, sizeof(linux_shminfo64));
  425 
  426                 linux_shminfo64.shmmax = linux_shminfo->shmmax;
  427                 linux_shminfo64.shmmin = linux_shminfo->shmmin;
  428                 linux_shminfo64.shmmni = linux_shminfo->shmmni;
  429                 linux_shminfo64.shmseg = linux_shminfo->shmseg;
  430                 linux_shminfo64.shmall = linux_shminfo->shmall;
  431 
  432                 return (copyout(&linux_shminfo64, uaddr,
  433                     sizeof(linux_shminfo64)));
  434         } else {
  435                 return (copyout(linux_shminfo, uaddr, sizeof(*linux_shminfo)));
  436         }
  437 }
  438 
  439 int
  440 linux_semop(struct thread *td, struct linux_semop_args *args)
  441 {
  442         struct semop_args /* {
  443         int     semid;
  444         struct  sembuf *sops;
  445         int             nsops;
  446         } */ bsd_args;
  447 
  448         bsd_args.semid = args->semid;
  449         bsd_args.sops = (struct sembuf *)args->tsops;
  450         bsd_args.nsops = args->nsops;
  451         return semop(td, &bsd_args);
  452 }
  453 
  454 int
  455 linux_semget(struct thread *td, struct linux_semget_args *args)
  456 {
  457         struct semget_args /* {
  458         key_t   key;
  459         int             nsems;
  460         int             semflg;
  461         } */ bsd_args;
  462 
  463         if (args->nsems < 0)
  464                 return (EINVAL);
  465         bsd_args.key = args->key;
  466         bsd_args.nsems = args->nsems;
  467         bsd_args.semflg = args->semflg;
  468         return semget(td, &bsd_args);
  469 }
  470 
  471 int
  472 linux_semctl(struct thread *td, struct linux_semctl_args *args)
  473 {
  474         struct l_semid_ds linux_semid;
  475         struct __semctl_args /* {
  476                 int             semid;
  477                 int             semnum;
  478                 int             cmd;
  479                 union semun     *arg;
  480         } */ bsd_args;
  481         struct l_seminfo linux_seminfo;
  482         int error;
  483         union semun *unptr;
  484         caddr_t sg;
  485 
  486         sg = stackgap_init();
  487 
  488         /* Make sure the arg parameter can be copied in. */
  489         unptr = stackgap_alloc(&sg, sizeof(union semun));
  490         bcopy(&args->arg, unptr, sizeof(union semun));
  491 
  492         bsd_args.semid = args->semid;
  493         bsd_args.semnum = args->semnum;
  494         bsd_args.arg = unptr;
  495 
  496         switch (args->cmd & ~LINUX_IPC_64) {
  497         case LINUX_IPC_RMID:
  498                 bsd_args.cmd = IPC_RMID;
  499                 break;
  500         case LINUX_GETNCNT:
  501                 bsd_args.cmd = GETNCNT;
  502                 break;
  503         case LINUX_GETPID:
  504                 bsd_args.cmd = GETPID;
  505                 break;
  506         case LINUX_GETVAL:
  507                 bsd_args.cmd = GETVAL;
  508                 break;
  509         case LINUX_GETZCNT:
  510                 bsd_args.cmd = GETZCNT;
  511                 break;
  512         case LINUX_SETVAL:
  513                 bsd_args.cmd = SETVAL;
  514                 break;
  515         case LINUX_IPC_SET:
  516                 bsd_args.cmd = IPC_SET;
  517                 error = linux_semid_pullup(args->cmd & LINUX_IPC_64,
  518                     &linux_semid, (caddr_t)args->arg.buf);
  519                 if (error)
  520                         return (error);
  521                 unptr->buf = stackgap_alloc(&sg, sizeof(struct semid_ds));
  522                 linux_to_bsd_semid_ds(&linux_semid, unptr->buf);
  523                 return __semctl(td, &bsd_args);
  524         case LINUX_IPC_STAT:
  525         case LINUX_SEM_STAT:
  526                 if((args->cmd & ~LINUX_IPC_64) == LINUX_IPC_STAT)
  527                         bsd_args.cmd = IPC_STAT;
  528                 else
  529                         bsd_args.cmd = SEM_STAT;
  530                 unptr->buf = stackgap_alloc(&sg, sizeof(struct semid_ds));
  531                 error = __semctl(td, &bsd_args);
  532                 if (error)
  533                         return error;
  534                 td->td_retval[0] = IXSEQ_TO_IPCID(bsd_args.semid,
  535                                                         unptr->buf->sem_perm);
  536                 bsd_to_linux_semid_ds(unptr->buf, &linux_semid);
  537                 return (linux_semid_pushdown(args->cmd & LINUX_IPC_64,
  538                     &linux_semid, (caddr_t)args->arg.buf));
  539         case LINUX_IPC_INFO:
  540         case LINUX_SEM_INFO:
  541                 bcopy(&seminfo, &linux_seminfo, sizeof(linux_seminfo) );
  542 /* XXX BSD equivalent?
  543 #define used_semids 10
  544 #define used_sems 10
  545                 linux_seminfo.semusz = used_semids;
  546                 linux_seminfo.semaem = used_sems;
  547 */
  548                 error = copyout(&linux_seminfo, args->arg.buf,
  549                     sizeof(linux_seminfo));
  550                 if (error)
  551                         return error;
  552                 td->td_retval[0] = seminfo.semmni;
  553                 return 0;                       /* No need for __semctl call */
  554         case LINUX_GETALL:
  555                 /* FALLTHROUGH */
  556         case LINUX_SETALL:
  557                 /* FALLTHROUGH */
  558         default:
  559                 linux_msg(td, "ipc type %d is not implemented",
  560                   args->cmd & ~LINUX_IPC_64);
  561                 return EINVAL;
  562         }
  563         return __semctl(td, &bsd_args);
  564 }
  565 
  566 int
  567 linux_msgsnd(struct thread *td, struct linux_msgsnd_args *args)
  568 {
  569     struct msgsnd_args /* {
  570         int     msqid;
  571         void    *msgp;
  572         size_t  msgsz;
  573         int     msgflg;
  574     } */ bsd_args;
  575 
  576     bsd_args.msqid = args->msqid;
  577     bsd_args.msgp = args->msgp;
  578     bsd_args.msgsz = args->msgsz;
  579     bsd_args.msgflg = args->msgflg;
  580     return msgsnd(td, &bsd_args);
  581 }
  582 
  583 int
  584 linux_msgrcv(struct thread *td, struct linux_msgrcv_args *args)
  585 {
  586     struct msgrcv_args /* {
  587         int     msqid;
  588         void    *msgp;
  589         size_t  msgsz;
  590         long    msgtyp;
  591         int     msgflg;
  592     } */ bsd_args;
  593 
  594     bsd_args.msqid = args->msqid;
  595     bsd_args.msgp = args->msgp;
  596     bsd_args.msgsz = args->msgsz;
  597     bsd_args.msgtyp = args->msgtyp;
  598     bsd_args.msgflg = args->msgflg;
  599     return msgrcv(td, &bsd_args);
  600 }
  601 
  602 int
  603 linux_msgget(struct thread *td, struct linux_msgget_args *args)
  604 {
  605     struct msgget_args /* {
  606         key_t   key;
  607         int     msgflg;
  608     } */ bsd_args;
  609 
  610     bsd_args.key = args->key;
  611     bsd_args.msgflg = args->msgflg;
  612     return msgget(td, &bsd_args);
  613 }
  614 
  615 int
  616 linux_msgctl(struct thread *td, struct linux_msgctl_args *args)
  617 {
  618     struct msgctl_args /* {
  619         int     msqid;
  620         int     cmd;
  621         struct  msqid_ds *buf;
  622     } */ bsd_args;
  623     int error;
  624     struct l_msqid_ds linux_msqid;
  625     caddr_t sg = stackgap_init();
  626 
  627     error = linux_msqid_pullup(args->cmd & LINUX_IPC_64,
  628       &linux_msqid, (caddr_t)args->buf);
  629     if (error != 0)
  630         return (error);
  631     bsd_args.buf = (struct msqid_ds*)stackgap_alloc(&sg,
  632       sizeof(struct l_msqid_ds));
  633     bsd_args.msqid = args->msqid;
  634     bsd_args.cmd = args->cmd & ~LINUX_IPC_64;
  635     if (bsd_args.cmd == LINUX_IPC_SET)
  636         linux_to_bsd_msqid_ds(&linux_msqid, bsd_args.buf);
  637 
  638     error = msgctl(td, &bsd_args);
  639     if (error != 0)
  640         if (bsd_args.cmd != LINUX_IPC_RMID || error != EINVAL)
  641             return (error);
  642 
  643     if (bsd_args.cmd == LINUX_IPC_STAT) {
  644         bsd_to_linux_msqid_ds(bsd_args.buf, &linux_msqid);
  645         return (linux_msqid_pushdown(args->cmd & LINUX_IPC_64,
  646           &linux_msqid, (caddr_t)args->buf));
  647     }
  648 
  649     return (0);
  650 }
  651 
  652 int
  653 linux_shmat(struct thread *td, struct linux_shmat_args *args)
  654 {
  655     struct shmat_args /* {
  656         int shmid;
  657         void *shmaddr;
  658         int shmflg;
  659     } */ bsd_args;
  660     int error;
  661 
  662     bsd_args.shmid = args->shmid;
  663     bsd_args.shmaddr = args->shmaddr;
  664     bsd_args.shmflg = args->shmflg;
  665     if ((error = shmat(td, &bsd_args)))
  666         return error;
  667 #ifdef __i386__
  668     if ((error = copyout(td->td_retval, args->raddr, sizeof(l_ulong))))
  669         return error;
  670     td->td_retval[0] = 0;
  671 #endif
  672     return 0;
  673 }
  674 
  675 int
  676 linux_shmdt(struct thread *td, struct linux_shmdt_args *args)
  677 {
  678     struct shmdt_args /* {
  679         void *shmaddr;
  680     } */ bsd_args;
  681 
  682     bsd_args.shmaddr = args->shmaddr;
  683     return shmdt(td, &bsd_args);
  684 }
  685 
  686 int
  687 linux_shmget(struct thread *td, struct linux_shmget_args *args)
  688 {
  689     struct shmget_args /* {
  690         key_t key;
  691         int size;
  692         int shmflg;
  693     } */ bsd_args;
  694 
  695     bsd_args.key = args->key;
  696     bsd_args.size = args->size;
  697     bsd_args.shmflg = args->shmflg;
  698     return shmget(td, &bsd_args);
  699 }
  700 
  701 int
  702 linux_shmctl(struct thread *td, struct linux_shmctl_args *args)
  703 {
  704     struct l_shmid_ds linux_shmid;
  705         struct l_shminfo linux_shminfo;
  706         struct l_shm_info linux_shm_info;
  707         struct shmid_ds bsd_shmid;
  708         size_t bufsz;
  709     int error;
  710 
  711     switch (args->cmd & ~LINUX_IPC_64) {
  712 
  713         case LINUX_IPC_INFO: {
  714             struct shminfo bsd_shminfo;
  715 
  716             /* Perform shmctl wanting removed segments lookup */
  717             error = kern_shmctl(td, args->shmid, IPC_INFO,
  718                 (void *)&bsd_shminfo, &bufsz, 1);
  719             if (error)
  720                 return error;
  721         
  722             bsd_to_linux_shminfo(&bsd_shminfo, &linux_shminfo);
  723 
  724             return (linux_shminfo_pushdown(args->cmd & LINUX_IPC_64,
  725                &linux_shminfo, (caddr_t)args->buf));
  726         }
  727 
  728         case LINUX_SHM_INFO: {
  729             struct shm_info bsd_shm_info;
  730 
  731             /* Perform shmctl wanting removed segments lookup */
  732             error = kern_shmctl(td, args->shmid, SHM_INFO,
  733                 (void *)&bsd_shm_info, &bufsz, 1);
  734             if (error)
  735                 return error;
  736 
  737             bsd_to_linux_shm_info(&bsd_shm_info, &linux_shm_info);
  738 
  739             return copyout(&linux_shm_info, (caddr_t)args->buf,
  740                 sizeof(struct l_shm_info));
  741         }
  742 
  743         case LINUX_IPC_STAT:
  744             /* Perform shmctl wanting removed segments lookup */
  745             error = kern_shmctl(td, args->shmid, IPC_STAT,
  746                 (void *)&bsd_shmid, &bufsz, 1);
  747             if (error)
  748                 return error;
  749                 
  750             bsd_to_linux_shmid_ds(&bsd_shmid, &linux_shmid);
  751 
  752             return (linux_shmid_pushdown(args->cmd & LINUX_IPC_64,
  753           &linux_shmid, (caddr_t)args->buf));
  754 
  755     case LINUX_SHM_STAT:
  756         /* Perform shmctl wanting removed segments lookup */
  757         error = kern_shmctl(td, args->shmid, IPC_STAT,
  758             (void *)&bsd_shmid, &bufsz, 1);
  759         if (error)
  760                 return error;
  761                 
  762         bsd_to_linux_shmid_ds(&bsd_shmid, &linux_shmid);
  763         
  764         return (linux_shmid_pushdown(args->cmd & LINUX_IPC_64,
  765            &linux_shmid, (caddr_t)args->buf));
  766 
  767     case LINUX_IPC_SET:
  768         error = linux_shmid_pullup(args->cmd & LINUX_IPC_64,
  769           &linux_shmid, (caddr_t)args->buf);
  770         if (error)
  771                 return error;
  772 
  773         linux_to_bsd_shmid_ds(&linux_shmid, &bsd_shmid);
  774 
  775         /* Perform shmctl wanting removed segments lookup */
  776         return kern_shmctl(td, args->shmid, IPC_SET,
  777             (void *)&bsd_shmid, &bufsz, 1);
  778 
  779     case LINUX_IPC_RMID: {
  780         void *buf;
  781                 
  782         if (args->buf == NULL)
  783                 buf = NULL;
  784         else {
  785                 error = linux_shmid_pullup(args->cmd & LINUX_IPC_64,
  786                     &linux_shmid, (caddr_t)args->buf);
  787                 if (error)
  788                         return error;
  789                 linux_to_bsd_shmid_ds(&linux_shmid, &bsd_shmid);
  790                 buf = (void *)&bsd_shmid;
  791         }
  792         return kern_shmctl(td, args->shmid, IPC_RMID, buf, &bufsz, 1);
  793     }
  794 
  795     case LINUX_SHM_LOCK:
  796     case LINUX_SHM_UNLOCK:
  797     default:
  798         linux_msg(td, "ipc typ=%d not implemented", args->cmd & ~LINUX_IPC_64);
  799         return EINVAL;
  800     }
  801 }

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