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 
   29 #include <sys/cdefs.h>
   30 __FBSDID("$FreeBSD: releng/10.2/sys/compat/linux/linux_ipc.c 230132 2012-01-15 13:23:18Z uqs $");
   31 
   32 #include <sys/param.h>
   33 #include <sys/systm.h>
   34 #include <sys/syscallsubr.h>
   35 #include <sys/sysproto.h>
   36 #include <sys/proc.h>
   37 #include <sys/limits.h>
   38 #include <sys/msg.h>
   39 #include <sys/sem.h>
   40 #include <sys/shm.h>
   41 
   42 #include "opt_compat.h"
   43 
   44 #ifdef COMPAT_LINUX32
   45 #include <machine/../linux32/linux.h>
   46 #include <machine/../linux32/linux32_proto.h>
   47 #include <machine/../linux32/linux32_ipc64.h>
   48 #else
   49 #include <machine/../linux/linux.h>
   50 #include <machine/../linux/linux_proto.h>
   51 #include <machine/../linux/linux_ipc64.h>
   52 #endif
   53 #include <compat/linux/linux_ipc.h>
   54 #include <compat/linux/linux_util.h>
   55 
   56 struct l_seminfo {
   57         l_int semmap;
   58         l_int semmni;
   59         l_int semmns;
   60         l_int semmnu;
   61         l_int semmsl;
   62         l_int semopm;
   63         l_int semume;
   64         l_int semusz;
   65         l_int semvmx;
   66         l_int semaem;
   67 };
   68 
   69 struct l_shminfo {
   70         l_int shmmax;
   71         l_int shmmin;
   72         l_int shmmni;
   73         l_int shmseg;
   74         l_int shmall;
   75 };
   76 
   77 struct l_shm_info {
   78         l_int used_ids;
   79         l_ulong shm_tot;  /* total allocated shm */
   80         l_ulong shm_rss;  /* total resident shm */
   81         l_ulong shm_swp;  /* total swapped shm */
   82         l_ulong swap_attempts;
   83         l_ulong swap_successes;
   84 };
   85 
   86 struct l_msginfo {
   87         l_int msgpool;
   88         l_int msgmap;
   89         l_int msgmax;
   90         l_int msgmnb;
   91         l_int msgmni;
   92         l_int msgssz;
   93         l_int msgtql;
   94         l_ushort msgseg;
   95 };
   96 
   97 static void
   98 bsd_to_linux_shminfo( struct shminfo *bpp, struct l_shminfo *lpp)
   99 {
  100 
  101         lpp->shmmax = bpp->shmmax;
  102         lpp->shmmin = bpp->shmmin;
  103         lpp->shmmni = bpp->shmmni;
  104         lpp->shmseg = bpp->shmseg;
  105         lpp->shmall = bpp->shmall;
  106 }
  107 
  108 static void
  109 bsd_to_linux_shm_info( struct shm_info *bpp, struct l_shm_info *lpp)
  110 {
  111 
  112         lpp->used_ids = bpp->used_ids ;
  113         lpp->shm_tot = bpp->shm_tot ;
  114         lpp->shm_rss = bpp->shm_rss ;
  115         lpp->shm_swp = bpp->shm_swp ;
  116         lpp->swap_attempts = bpp->swap_attempts ;
  117         lpp->swap_successes = bpp->swap_successes ;
  118 }
  119 
  120 struct l_ipc_perm {
  121         l_key_t         key;
  122         l_uid16_t       uid;
  123         l_gid16_t       gid;
  124         l_uid16_t       cuid;
  125         l_gid16_t       cgid;
  126         l_ushort        mode;
  127         l_ushort        seq;
  128 };
  129 
  130 static void
  131 linux_to_bsd_ipc_perm(struct l_ipc_perm *lpp, struct ipc_perm *bpp)
  132 {
  133 
  134         bpp->key = lpp->key;
  135         bpp->uid = lpp->uid;
  136         bpp->gid = lpp->gid;
  137         bpp->cuid = lpp->cuid;
  138         bpp->cgid = lpp->cgid;
  139         bpp->mode = lpp->mode;
  140         bpp->seq = lpp->seq;
  141 }
  142 
  143 
  144 static void
  145 bsd_to_linux_ipc_perm(struct ipc_perm *bpp, struct l_ipc_perm *lpp)
  146 {
  147 
  148         lpp->key = bpp->key;
  149         lpp->uid = bpp->uid;
  150         lpp->gid = bpp->gid;
  151         lpp->cuid = bpp->cuid;
  152         lpp->cgid = bpp->cgid;
  153         lpp->mode = bpp->mode;
  154         lpp->seq = bpp->seq;
  155 }
  156 
  157 struct l_msqid_ds {
  158         struct l_ipc_perm       msg_perm;
  159         l_uintptr_t             msg_first;      /* first message on queue,unused */
  160         l_uintptr_t             msg_last;       /* last message in queue,unused */
  161         l_time_t                msg_stime;      /* last msgsnd time */
  162         l_time_t                msg_rtime;      /* last msgrcv time */
  163         l_time_t                msg_ctime;      /* last change time */
  164         l_ulong                 msg_lcbytes;    /* Reuse junk fields for 32 bit */
  165         l_ulong                 msg_lqbytes;    /* ditto */
  166         l_ushort                msg_cbytes;     /* current number of bytes on queue */
  167         l_ushort                msg_qnum;       /* number of messages in queue */
  168         l_ushort                msg_qbytes;     /* max number of bytes on queue */
  169         l_pid_t                 msg_lspid;      /* pid of last msgsnd */
  170         l_pid_t                 msg_lrpid;      /* last receive pid */
  171 }
  172 #if defined(__amd64__) && defined(COMPAT_LINUX32)
  173 __packed
  174 #endif
  175 ;
  176 
  177 struct l_semid_ds {
  178         struct l_ipc_perm       sem_perm;
  179         l_time_t                sem_otime;
  180         l_time_t                sem_ctime;
  181         l_uintptr_t             sem_base;
  182         l_uintptr_t             sem_pending;
  183         l_uintptr_t             sem_pending_last;
  184         l_uintptr_t             undo;
  185         l_ushort                sem_nsems;
  186 }
  187 #if defined(__amd64__) && defined(COMPAT_LINUX32)
  188 __packed
  189 #endif
  190 ;
  191 
  192 struct l_shmid_ds {
  193         struct l_ipc_perm       shm_perm;
  194         l_int                   shm_segsz;
  195         l_time_t                shm_atime;
  196         l_time_t                shm_dtime;
  197         l_time_t                shm_ctime;
  198         l_ushort                shm_cpid;
  199         l_ushort                shm_lpid;
  200         l_short                 shm_nattch;
  201         l_ushort                private1;
  202         l_uintptr_t             private2;
  203         l_uintptr_t             private3;
  204 };
  205 
  206 static void
  207 linux_to_bsd_semid_ds(struct l_semid_ds *lsp, struct semid_ds *bsp)
  208 {
  209 
  210         linux_to_bsd_ipc_perm(&lsp->sem_perm, &bsp->sem_perm);
  211         bsp->sem_otime = lsp->sem_otime;
  212         bsp->sem_ctime = lsp->sem_ctime;
  213         bsp->sem_nsems = lsp->sem_nsems;
  214         bsp->sem_base = PTRIN(lsp->sem_base);
  215 }
  216 
  217 static void
  218 bsd_to_linux_semid_ds(struct semid_ds *bsp, struct l_semid_ds *lsp)
  219 {
  220 
  221         bsd_to_linux_ipc_perm(&bsp->sem_perm, &lsp->sem_perm);
  222         lsp->sem_otime = bsp->sem_otime;
  223         lsp->sem_ctime = bsp->sem_ctime;
  224         lsp->sem_nsems = bsp->sem_nsems;
  225         lsp->sem_base = PTROUT(bsp->sem_base);
  226 }
  227 
  228 static void
  229 linux_to_bsd_shmid_ds(struct l_shmid_ds *lsp, struct shmid_ds *bsp)
  230 {
  231 
  232         linux_to_bsd_ipc_perm(&lsp->shm_perm, &bsp->shm_perm);
  233         bsp->shm_segsz = lsp->shm_segsz;
  234         bsp->shm_lpid = lsp->shm_lpid;
  235         bsp->shm_cpid = lsp->shm_cpid;
  236         bsp->shm_nattch = lsp->shm_nattch;
  237         bsp->shm_atime = lsp->shm_atime;
  238         bsp->shm_dtime = lsp->shm_dtime;
  239         bsp->shm_ctime = lsp->shm_ctime;
  240 }
  241 
  242 static void
  243 bsd_to_linux_shmid_ds(struct shmid_ds *bsp, struct l_shmid_ds *lsp)
  244 {
  245 
  246         bsd_to_linux_ipc_perm(&bsp->shm_perm, &lsp->shm_perm);
  247         if (bsp->shm_segsz > INT_MAX)
  248                 lsp->shm_segsz = INT_MAX;
  249         else
  250                 lsp->shm_segsz = bsp->shm_segsz;
  251         lsp->shm_lpid = bsp->shm_lpid;
  252         lsp->shm_cpid = bsp->shm_cpid;
  253         if (bsp->shm_nattch > SHRT_MAX)
  254                 lsp->shm_nattch = SHRT_MAX;
  255         else
  256                 lsp->shm_nattch = bsp->shm_nattch;
  257         lsp->shm_atime = bsp->shm_atime;
  258         lsp->shm_dtime = bsp->shm_dtime;
  259         lsp->shm_ctime = bsp->shm_ctime;
  260         lsp->private3 = 0;
  261 }
  262 
  263 static void
  264 linux_to_bsd_msqid_ds(struct l_msqid_ds *lsp, struct msqid_ds *bsp)
  265 {
  266 
  267         linux_to_bsd_ipc_perm(&lsp->msg_perm, &bsp->msg_perm);
  268         bsp->msg_cbytes = lsp->msg_cbytes;
  269         bsp->msg_qnum = lsp->msg_qnum;
  270         bsp->msg_qbytes = lsp->msg_qbytes;
  271         bsp->msg_lspid = lsp->msg_lspid;
  272         bsp->msg_lrpid = lsp->msg_lrpid;
  273         bsp->msg_stime = lsp->msg_stime;
  274         bsp->msg_rtime = lsp->msg_rtime;
  275         bsp->msg_ctime = lsp->msg_ctime;
  276 }
  277 
  278 static void
  279 bsd_to_linux_msqid_ds(struct msqid_ds *bsp, struct l_msqid_ds *lsp)
  280 {
  281 
  282         bsd_to_linux_ipc_perm(&bsp->msg_perm, &lsp->msg_perm);
  283         lsp->msg_cbytes = bsp->msg_cbytes;
  284         lsp->msg_qnum = bsp->msg_qnum;
  285         lsp->msg_qbytes = bsp->msg_qbytes;
  286         lsp->msg_lspid = bsp->msg_lspid;
  287         lsp->msg_lrpid = bsp->msg_lrpid;
  288         lsp->msg_stime = bsp->msg_stime;
  289         lsp->msg_rtime = bsp->msg_rtime;
  290         lsp->msg_ctime = bsp->msg_ctime;
  291 }
  292 
  293 static void
  294 linux_ipc_perm_to_ipc64_perm(struct l_ipc_perm *in, struct l_ipc64_perm *out)
  295 {
  296 
  297         /* XXX: do we really need to do something here? */
  298         out->key = in->key;
  299         out->uid = in->uid;
  300         out->gid = in->gid;
  301         out->cuid = in->cuid;
  302         out->cgid = in->cgid;
  303         out->mode = in->mode;
  304         out->seq = in->seq;
  305 }
  306 
  307 static int
  308 linux_msqid_pullup(l_int ver, struct l_msqid_ds *linux_msqid, caddr_t uaddr)
  309 {
  310         struct l_msqid64_ds linux_msqid64;
  311         int error;
  312 
  313         if (ver == LINUX_IPC_64) {
  314                 error = copyin(uaddr, &linux_msqid64, sizeof(linux_msqid64));
  315                 if (error != 0)
  316                         return (error);
  317 
  318                 bzero(linux_msqid, sizeof(*linux_msqid));
  319 
  320                 linux_msqid->msg_perm.uid = linux_msqid64.msg_perm.uid;
  321                 linux_msqid->msg_perm.gid = linux_msqid64.msg_perm.gid;
  322                 linux_msqid->msg_perm.mode = linux_msqid64.msg_perm.mode;
  323 
  324                 if (linux_msqid64.msg_qbytes > USHRT_MAX)
  325                         linux_msqid->msg_lqbytes = linux_msqid64.msg_qbytes;
  326                 else
  327                         linux_msqid->msg_qbytes = linux_msqid64.msg_qbytes;
  328         } else
  329                 error = copyin(uaddr, linux_msqid, sizeof(*linux_msqid));
  330 
  331         return (error);
  332 }
  333 
  334 static int
  335 linux_msqid_pushdown(l_int ver, struct l_msqid_ds *linux_msqid, caddr_t uaddr)
  336 {
  337         struct l_msqid64_ds linux_msqid64;
  338 
  339         if (ver == LINUX_IPC_64) {
  340                 bzero(&linux_msqid64, sizeof(linux_msqid64));
  341 
  342                 linux_ipc_perm_to_ipc64_perm(&linux_msqid->msg_perm,
  343                     &linux_msqid64.msg_perm);
  344 
  345                 linux_msqid64.msg_stime = linux_msqid->msg_stime;
  346                 linux_msqid64.msg_rtime = linux_msqid->msg_rtime;
  347                 linux_msqid64.msg_ctime = linux_msqid->msg_ctime;
  348 
  349                 if (linux_msqid->msg_cbytes == 0)
  350                         linux_msqid64.msg_cbytes = linux_msqid->msg_lcbytes;
  351                 else
  352                         linux_msqid64.msg_cbytes = linux_msqid->msg_cbytes;
  353 
  354                 linux_msqid64.msg_qnum = linux_msqid->msg_qnum;
  355 
  356                 if (linux_msqid->msg_qbytes == 0)
  357                         linux_msqid64.msg_qbytes = linux_msqid->msg_lqbytes;
  358                 else
  359                         linux_msqid64.msg_qbytes = linux_msqid->msg_qbytes;
  360 
  361                 linux_msqid64.msg_lspid = linux_msqid->msg_lspid;
  362                 linux_msqid64.msg_lrpid = linux_msqid->msg_lrpid;
  363 
  364                 return (copyout(&linux_msqid64, uaddr, sizeof(linux_msqid64)));
  365         } else
  366                 return (copyout(linux_msqid, uaddr, sizeof(*linux_msqid)));
  367 }
  368 
  369 static int
  370 linux_semid_pullup(l_int ver, struct l_semid_ds *linux_semid, caddr_t uaddr)
  371 {
  372         struct l_semid64_ds linux_semid64;
  373         int error;
  374 
  375         if (ver == LINUX_IPC_64) {
  376                 error = copyin(uaddr, &linux_semid64, sizeof(linux_semid64));
  377                 if (error != 0)
  378                         return (error);
  379 
  380                 bzero(linux_semid, sizeof(*linux_semid));
  381 
  382                 linux_semid->sem_perm.uid = linux_semid64.sem_perm.uid;
  383                 linux_semid->sem_perm.gid = linux_semid64.sem_perm.gid;
  384                 linux_semid->sem_perm.mode = linux_semid64.sem_perm.mode;
  385         } else
  386                 error = copyin(uaddr, linux_semid, sizeof(*linux_semid));
  387 
  388         return (error);
  389 }
  390 
  391 static int
  392 linux_semid_pushdown(l_int ver, struct l_semid_ds *linux_semid, caddr_t uaddr)
  393 {
  394         struct l_semid64_ds linux_semid64;
  395 
  396         if (ver == LINUX_IPC_64) {
  397                 bzero(&linux_semid64, sizeof(linux_semid64));
  398 
  399                 linux_ipc_perm_to_ipc64_perm(&linux_semid->sem_perm,
  400                     &linux_semid64.sem_perm);
  401 
  402                 linux_semid64.sem_otime = linux_semid->sem_otime;
  403                 linux_semid64.sem_ctime = linux_semid->sem_ctime;
  404                 linux_semid64.sem_nsems = linux_semid->sem_nsems;
  405 
  406                 return (copyout(&linux_semid64, uaddr, sizeof(linux_semid64)));
  407         } else
  408                 return (copyout(linux_semid, uaddr, sizeof(*linux_semid)));
  409 }
  410 
  411 static int
  412 linux_shmid_pullup(l_int ver, struct l_shmid_ds *linux_shmid, caddr_t uaddr)
  413 {
  414         struct l_shmid64_ds linux_shmid64;
  415         int error;
  416 
  417         if (ver == LINUX_IPC_64) {
  418                 error = copyin(uaddr, &linux_shmid64, sizeof(linux_shmid64));
  419                 if (error != 0)
  420                         return (error);
  421 
  422                 bzero(linux_shmid, sizeof(*linux_shmid));
  423 
  424                 linux_shmid->shm_perm.uid = linux_shmid64.shm_perm.uid;
  425                 linux_shmid->shm_perm.gid = linux_shmid64.shm_perm.gid;
  426                 linux_shmid->shm_perm.mode = linux_shmid64.shm_perm.mode;
  427         } else
  428                 error = copyin(uaddr, linux_shmid, sizeof(*linux_shmid));
  429 
  430         return (error);
  431 }
  432 
  433 static int
  434 linux_shmid_pushdown(l_int ver, struct l_shmid_ds *linux_shmid, caddr_t uaddr)
  435 {
  436         struct l_shmid64_ds linux_shmid64;
  437 
  438         /*
  439          * XXX: This is backwards and loses information in shm_nattch
  440          * and shm_segsz.  We should probably either expose the BSD
  441          * shmid structure directly and convert it to either the
  442          * non-64 or 64 variant directly or the code should always
  443          * convert to the 64 variant and then truncate values into the
  444          * non-64 variant if needed since the 64 variant has more
  445          * precision.
  446          */
  447         if (ver == LINUX_IPC_64) {
  448                 bzero(&linux_shmid64, sizeof(linux_shmid64));
  449 
  450                 linux_ipc_perm_to_ipc64_perm(&linux_shmid->shm_perm,
  451                     &linux_shmid64.shm_perm);
  452 
  453                 linux_shmid64.shm_segsz = linux_shmid->shm_segsz;
  454                 linux_shmid64.shm_atime = linux_shmid->shm_atime;
  455                 linux_shmid64.shm_dtime = linux_shmid->shm_dtime;
  456                 linux_shmid64.shm_ctime = linux_shmid->shm_ctime;
  457                 linux_shmid64.shm_cpid = linux_shmid->shm_cpid;
  458                 linux_shmid64.shm_lpid = linux_shmid->shm_lpid;
  459                 linux_shmid64.shm_nattch = linux_shmid->shm_nattch;
  460 
  461                 return (copyout(&linux_shmid64, uaddr, sizeof(linux_shmid64)));
  462         } else
  463                 return (copyout(linux_shmid, uaddr, sizeof(*linux_shmid)));
  464 }
  465 
  466 static int
  467 linux_shminfo_pushdown(l_int ver, struct l_shminfo *linux_shminfo,
  468     caddr_t uaddr)
  469 {
  470         struct l_shminfo64 linux_shminfo64;
  471 
  472         if (ver == LINUX_IPC_64) {
  473                 bzero(&linux_shminfo64, sizeof(linux_shminfo64));
  474 
  475                 linux_shminfo64.shmmax = linux_shminfo->shmmax;
  476                 linux_shminfo64.shmmin = linux_shminfo->shmmin;
  477                 linux_shminfo64.shmmni = linux_shminfo->shmmni;
  478                 linux_shminfo64.shmseg = linux_shminfo->shmseg;
  479                 linux_shminfo64.shmall = linux_shminfo->shmall;
  480 
  481                 return (copyout(&linux_shminfo64, uaddr,
  482                     sizeof(linux_shminfo64)));
  483         } else
  484                 return (copyout(linux_shminfo, uaddr, sizeof(*linux_shminfo)));
  485 }
  486 
  487 int
  488 linux_semop(struct thread *td, struct linux_semop_args *args)
  489 {
  490         struct semop_args /* {
  491         int     semid;
  492         struct  sembuf *sops;
  493         int             nsops;
  494         } */ bsd_args;
  495 
  496         bsd_args.semid = args->semid;
  497         bsd_args.sops = PTRIN(args->tsops);
  498         bsd_args.nsops = args->nsops;
  499         return (sys_semop(td, &bsd_args));
  500 }
  501 
  502 int
  503 linux_semget(struct thread *td, struct linux_semget_args *args)
  504 {
  505         struct semget_args /* {
  506         key_t   key;
  507         int             nsems;
  508         int             semflg;
  509         } */ bsd_args;
  510 
  511         if (args->nsems < 0)
  512                 return (EINVAL);
  513         bsd_args.key = args->key;
  514         bsd_args.nsems = args->nsems;
  515         bsd_args.semflg = args->semflg;
  516         return (sys_semget(td, &bsd_args));
  517 }
  518 
  519 int
  520 linux_semctl(struct thread *td, struct linux_semctl_args *args)
  521 {
  522         struct l_semid_ds linux_semid;
  523         struct l_seminfo linux_seminfo;
  524         struct semid_ds semid;
  525         union semun semun;
  526         register_t rval;
  527         int cmd, error;
  528 
  529         switch (args->cmd & ~LINUX_IPC_64) {
  530         case LINUX_IPC_RMID:
  531                 cmd = IPC_RMID;
  532                 break;
  533         case LINUX_GETNCNT:
  534                 cmd = GETNCNT;
  535                 break;
  536         case LINUX_GETPID:
  537                 cmd = GETPID;
  538                 break;
  539         case LINUX_GETVAL:
  540                 cmd = GETVAL;
  541                 break;
  542         case LINUX_GETZCNT:
  543                 cmd = GETZCNT;
  544                 break;
  545         case LINUX_SETVAL:
  546                 cmd = SETVAL;
  547                 semun.val = args->arg.val;
  548                 break;
  549         case LINUX_IPC_SET:
  550                 cmd = IPC_SET;
  551                 error = linux_semid_pullup(args->cmd & LINUX_IPC_64,
  552                     &linux_semid, PTRIN(args->arg.buf));
  553                 if (error)
  554                         return (error);
  555                 linux_to_bsd_semid_ds(&linux_semid, &semid);
  556                 semun.buf = &semid;
  557                 return (kern_semctl(td, args->semid, args->semnum, cmd, &semun,
  558                     td->td_retval));
  559         case LINUX_IPC_STAT:
  560         case LINUX_SEM_STAT:
  561                 if ((args->cmd & ~LINUX_IPC_64) == LINUX_IPC_STAT)
  562                         cmd = IPC_STAT;
  563                 else
  564                         cmd = SEM_STAT;
  565                 semun.buf = &semid;
  566                 error = kern_semctl(td, args->semid, args->semnum, cmd, &semun,
  567                     &rval);
  568                 if (error)
  569                         return (error);
  570                 bsd_to_linux_semid_ds(&semid, &linux_semid);
  571                 error = linux_semid_pushdown(args->cmd & LINUX_IPC_64,
  572                     &linux_semid, PTRIN(args->arg.buf));
  573                 if (error == 0)
  574                         td->td_retval[0] = (cmd == SEM_STAT) ? rval : 0;
  575                 return (error);
  576         case LINUX_IPC_INFO:
  577         case LINUX_SEM_INFO:
  578                 bcopy(&seminfo, &linux_seminfo.semmni, sizeof(linux_seminfo) -
  579                     sizeof(linux_seminfo.semmap) );
  580                 /*
  581                  * Linux does not use the semmap field but populates it with
  582                  * the defined value from SEMMAP, which really is redefined to
  583                  * SEMMNS, which they define as SEMMNI * SEMMSL.  Try to
  584                  * simulate this returning our dynamic semmns value.
  585                  */
  586                 linux_seminfo.semmap = linux_seminfo.semmns;
  587 /* XXX BSD equivalent?
  588 #define used_semids 10
  589 #define used_sems 10
  590                 linux_seminfo.semusz = used_semids;
  591                 linux_seminfo.semaem = used_sems;
  592 */
  593                 error = copyout(&linux_seminfo,
  594                     PTRIN(args->arg.buf), sizeof(linux_seminfo));
  595                 if (error)
  596                         return (error);
  597                 td->td_retval[0] = seminfo.semmni;
  598                 return (0);                     /* No need for __semctl call */
  599         case LINUX_GETALL:
  600                 cmd = GETALL;
  601                 semun.val = args->arg.val;
  602                 break;
  603         case LINUX_SETALL:
  604                 cmd = SETALL;
  605                 semun.val = args->arg.val;
  606                 break;
  607         default:
  608                 linux_msg(td, "ipc type %d is not implemented",
  609                   args->cmd & ~LINUX_IPC_64);
  610                 return (EINVAL);
  611         }
  612         return (kern_semctl(td, args->semid, args->semnum, cmd, &semun,
  613             td->td_retval));
  614 }
  615 
  616 int
  617 linux_msgsnd(struct thread *td, struct linux_msgsnd_args *args)
  618 {
  619         const void *msgp;
  620         long mtype;
  621         l_long lmtype;
  622         int error;
  623 
  624         if ((l_long)args->msgsz < 0 || args->msgsz > (l_long)msginfo.msgmax)
  625                 return (EINVAL);
  626         msgp = PTRIN(args->msgp);
  627         if ((error = copyin(msgp, &lmtype, sizeof(lmtype))) != 0)
  628                 return (error);
  629         mtype = (long)lmtype;
  630         return (kern_msgsnd(td, args->msqid,
  631             (const char *)msgp + sizeof(lmtype),
  632             args->msgsz, args->msgflg, mtype));
  633 }
  634 
  635 int
  636 linux_msgrcv(struct thread *td, struct linux_msgrcv_args *args)
  637 {
  638         void *msgp;
  639         long mtype;
  640         l_long lmtype;
  641         int error;
  642 
  643         if ((l_long)args->msgsz < 0 || args->msgsz > (l_long)msginfo.msgmax)
  644                 return (EINVAL);
  645         msgp = PTRIN(args->msgp);
  646         if ((error = kern_msgrcv(td, args->msqid,
  647             (char *)msgp + sizeof(lmtype), args->msgsz,
  648             args->msgtyp, args->msgflg, &mtype)) != 0)
  649                 return (error);
  650         lmtype = (l_long)mtype;
  651         return (copyout(&lmtype, msgp, sizeof(lmtype)));
  652 }
  653 
  654 int
  655 linux_msgget(struct thread *td, struct linux_msgget_args *args)
  656 {
  657         struct msgget_args /* {
  658                 key_t   key;
  659                 int     msgflg;
  660         } */ bsd_args;
  661 
  662         bsd_args.key = args->key;
  663         bsd_args.msgflg = args->msgflg;
  664         return (sys_msgget(td, &bsd_args));
  665 }
  666 
  667 int
  668 linux_msgctl(struct thread *td, struct linux_msgctl_args *args)
  669 {
  670         int error, bsd_cmd;
  671         struct l_msqid_ds linux_msqid;
  672         struct msqid_ds bsd_msqid;
  673 
  674         bsd_cmd = args->cmd & ~LINUX_IPC_64;
  675         switch (bsd_cmd) {
  676         case LINUX_IPC_INFO:
  677         case LINUX_MSG_INFO: {
  678                 struct l_msginfo linux_msginfo;
  679 
  680                 /*
  681                  * XXX MSG_INFO uses the same data structure but returns different
  682                  * dynamic counters in msgpool, msgmap, and msgtql fields.
  683                  */
  684                 linux_msginfo.msgpool = (long)msginfo.msgmni *
  685                     (long)msginfo.msgmnb / 1024L;       /* XXX MSG_INFO. */
  686                 linux_msginfo.msgmap = msginfo.msgmnb;  /* XXX MSG_INFO. */
  687                 linux_msginfo.msgmax = msginfo.msgmax;
  688                 linux_msginfo.msgmnb = msginfo.msgmnb;
  689                 linux_msginfo.msgmni = msginfo.msgmni;
  690                 linux_msginfo.msgssz = msginfo.msgssz;
  691                 linux_msginfo.msgtql = msginfo.msgtql;  /* XXX MSG_INFO. */
  692                 linux_msginfo.msgseg = msginfo.msgseg;
  693                 error = copyout(&linux_msginfo, PTRIN(args->buf),
  694                     sizeof(linux_msginfo));
  695                 if (error == 0)
  696                     td->td_retval[0] = msginfo.msgmni;  /* XXX */
  697 
  698                 return (error);
  699         }
  700 
  701         /* 
  702          * TODO: implement this 
  703          * case LINUX_MSG_STAT:
  704          */
  705         case LINUX_IPC_STAT:
  706                 /* NOTHING */
  707                 break;
  708 
  709         case LINUX_IPC_SET:
  710                 error = linux_msqid_pullup(args->cmd & LINUX_IPC_64,
  711                     &linux_msqid, PTRIN(args->buf));
  712                 if (error)
  713                         return (error);
  714                 linux_to_bsd_msqid_ds(&linux_msqid, &bsd_msqid);
  715                 break;
  716 
  717         case LINUX_IPC_RMID:
  718                 /* NOTHING */
  719                 break;
  720 
  721         default:
  722                 return (EINVAL);
  723                 break;
  724         }
  725 
  726         error = kern_msgctl(td, args->msqid, bsd_cmd, &bsd_msqid);
  727         if (error != 0)
  728                 if (bsd_cmd != LINUX_IPC_RMID || error != EINVAL)
  729                         return (error);
  730 
  731         if (bsd_cmd == LINUX_IPC_STAT) {
  732                 bsd_to_linux_msqid_ds(&bsd_msqid, &linux_msqid);
  733                 return (linux_msqid_pushdown(args->cmd & LINUX_IPC_64,
  734                     &linux_msqid, PTRIN(args->buf)));
  735         }
  736 
  737         return (0);
  738 }
  739 
  740 int
  741 linux_shmat(struct thread *td, struct linux_shmat_args *args)
  742 {
  743         struct shmat_args /* {
  744                 int shmid;
  745                 void *shmaddr;
  746                 int shmflg;
  747         } */ bsd_args;
  748         int error;
  749 #if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32))
  750         l_uintptr_t addr;
  751 #endif
  752 
  753         bsd_args.shmid = args->shmid;
  754         bsd_args.shmaddr = PTRIN(args->shmaddr);
  755         bsd_args.shmflg = args->shmflg;
  756         if ((error = sys_shmat(td, &bsd_args)))
  757                 return (error);
  758 #if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32))
  759         addr = td->td_retval[0];
  760         if ((error = copyout(&addr, PTRIN(args->raddr), sizeof(addr))))
  761                 return (error);
  762         td->td_retval[0] = 0;
  763 #endif
  764         return (0);
  765 }
  766 
  767 int
  768 linux_shmdt(struct thread *td, struct linux_shmdt_args *args)
  769 {
  770         struct shmdt_args /* {
  771                 void *shmaddr;
  772         } */ bsd_args;
  773 
  774         bsd_args.shmaddr = PTRIN(args->shmaddr);
  775         return (sys_shmdt(td, &bsd_args));
  776 }
  777 
  778 int
  779 linux_shmget(struct thread *td, struct linux_shmget_args *args)
  780 {
  781         struct shmget_args /* {
  782                 key_t key;
  783                 int size;
  784                 int shmflg;
  785         } */ bsd_args;
  786 
  787         bsd_args.key = args->key;
  788         bsd_args.size = args->size;
  789         bsd_args.shmflg = args->shmflg;
  790         return (sys_shmget(td, &bsd_args));
  791 }
  792 
  793 int
  794 linux_shmctl(struct thread *td, struct linux_shmctl_args *args)
  795 {
  796         struct l_shmid_ds linux_shmid;
  797         struct l_shminfo linux_shminfo;
  798         struct l_shm_info linux_shm_info;
  799         struct shmid_ds bsd_shmid;
  800         int error;
  801 
  802         switch (args->cmd & ~LINUX_IPC_64) {
  803 
  804         case LINUX_IPC_INFO: {
  805                 struct shminfo bsd_shminfo;
  806 
  807                 /* Perform shmctl wanting removed segments lookup */
  808                 error = kern_shmctl(td, args->shmid, IPC_INFO,
  809                     (void *)&bsd_shminfo, NULL);
  810                 if (error)
  811                         return (error);
  812 
  813                 bsd_to_linux_shminfo(&bsd_shminfo, &linux_shminfo);
  814 
  815                 return (linux_shminfo_pushdown(args->cmd & LINUX_IPC_64,
  816                     &linux_shminfo, PTRIN(args->buf)));
  817         }
  818 
  819         case LINUX_SHM_INFO: {
  820                 struct shm_info bsd_shm_info;
  821 
  822                 /* Perform shmctl wanting removed segments lookup */
  823                 error = kern_shmctl(td, args->shmid, SHM_INFO,
  824                     (void *)&bsd_shm_info, NULL);
  825                 if (error)
  826                         return (error);
  827 
  828                 bsd_to_linux_shm_info(&bsd_shm_info, &linux_shm_info);
  829 
  830                 return (copyout(&linux_shm_info, PTRIN(args->buf),
  831                     sizeof(struct l_shm_info)));
  832         }
  833 
  834         case LINUX_IPC_STAT:
  835                 /* Perform shmctl wanting removed segments lookup */
  836                 error = kern_shmctl(td, args->shmid, IPC_STAT,
  837                     (void *)&bsd_shmid, NULL);
  838                 if (error)
  839                         return (error);
  840                 
  841                 bsd_to_linux_shmid_ds(&bsd_shmid, &linux_shmid);
  842 
  843                 return (linux_shmid_pushdown(args->cmd & LINUX_IPC_64,
  844                     &linux_shmid, PTRIN(args->buf)));
  845 
  846         case LINUX_SHM_STAT:
  847                 /* Perform shmctl wanting removed segments lookup */
  848                 error = kern_shmctl(td, args->shmid, IPC_STAT,
  849                     (void *)&bsd_shmid, NULL);
  850                 if (error)
  851                         return (error);
  852                 
  853                 bsd_to_linux_shmid_ds(&bsd_shmid, &linux_shmid);
  854 
  855                 return (linux_shmid_pushdown(args->cmd & LINUX_IPC_64,
  856                     &linux_shmid, PTRIN(args->buf)));
  857 
  858         case LINUX_IPC_SET:
  859                 error = linux_shmid_pullup(args->cmd & LINUX_IPC_64,
  860                     &linux_shmid, PTRIN(args->buf));
  861                 if (error)
  862                         return (error);
  863 
  864                 linux_to_bsd_shmid_ds(&linux_shmid, &bsd_shmid);
  865 
  866                 /* Perform shmctl wanting removed segments lookup */
  867                 return (kern_shmctl(td, args->shmid, IPC_SET,
  868                     (void *)&bsd_shmid, NULL));
  869 
  870         case LINUX_IPC_RMID: {
  871                 void *buf;
  872 
  873                 if (args->buf == 0)
  874                         buf = NULL;
  875                 else {
  876                         error = linux_shmid_pullup(args->cmd & LINUX_IPC_64,
  877                             &linux_shmid, PTRIN(args->buf));
  878                         if (error)
  879                                 return (error);
  880                         linux_to_bsd_shmid_ds(&linux_shmid, &bsd_shmid);
  881                         buf = (void *)&bsd_shmid;
  882                 }
  883                 return (kern_shmctl(td, args->shmid, IPC_RMID, buf, NULL));
  884         }
  885 
  886         case LINUX_SHM_LOCK:
  887                 /* FALLTHROUGH */
  888         case LINUX_SHM_UNLOCK:
  889                 /* FALLTHROUGH */
  890         default:
  891                 linux_msg(td, "ipc type %d not implemented",
  892                     args->cmd & ~LINUX_IPC_64);
  893                 return (EINVAL);
  894         }
  895 }
  896 
  897 MODULE_DEPEND(linux, sysvmsg, 1, 1, 1);
  898 MODULE_DEPEND(linux, sysvsem, 1, 1, 1);
  899 MODULE_DEPEND(linux, sysvshm, 1, 1, 1);

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