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

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