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/10.3/sys/compat/linux/linux_ipc.c 293522 2016-01-09 15:56:01Z dchagin $");
   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 static void
  121 linux_to_bsd_ipc_perm(struct l_ipc_perm *lpp, struct ipc_perm *bpp)
  122 {
  123 
  124         bpp->key = lpp->key;
  125         bpp->uid = lpp->uid;
  126         bpp->gid = lpp->gid;
  127         bpp->cuid = lpp->cuid;
  128         bpp->cgid = lpp->cgid;
  129         bpp->mode = lpp->mode;
  130         bpp->seq = lpp->seq;
  131 }
  132 
  133 
  134 static void
  135 bsd_to_linux_ipc_perm(struct ipc_perm *bpp, struct l_ipc_perm *lpp)
  136 {
  137 
  138         lpp->key = bpp->key;
  139         lpp->uid = bpp->uid;
  140         lpp->gid = bpp->gid;
  141         lpp->cuid = bpp->cuid;
  142         lpp->cgid = bpp->cgid;
  143         lpp->mode = bpp->mode;
  144         lpp->seq = bpp->seq;
  145 }
  146 
  147 struct l_msqid_ds {
  148         struct l_ipc_perm       msg_perm;
  149         l_uintptr_t             msg_first;      /* first message on queue,unused */
  150         l_uintptr_t             msg_last;       /* last message in queue,unused */
  151         l_time_t                msg_stime;      /* last msgsnd time */
  152         l_time_t                msg_rtime;      /* last msgrcv time */
  153         l_time_t                msg_ctime;      /* last change time */
  154         l_ulong                 msg_lcbytes;    /* Reuse junk fields for 32 bit */
  155         l_ulong                 msg_lqbytes;    /* ditto */
  156         l_ushort                msg_cbytes;     /* current number of bytes on queue */
  157         l_ushort                msg_qnum;       /* number of messages in queue */
  158         l_ushort                msg_qbytes;     /* max number of bytes on queue */
  159         l_pid_t                 msg_lspid;      /* pid of last msgsnd */
  160         l_pid_t                 msg_lrpid;      /* last receive pid */
  161 }
  162 #if defined(__amd64__) && defined(COMPAT_LINUX32)
  163 __packed
  164 #endif
  165 ;
  166 
  167 struct l_semid_ds {
  168         struct l_ipc_perm       sem_perm;
  169         l_time_t                sem_otime;
  170         l_time_t                sem_ctime;
  171         l_uintptr_t             sem_base;
  172         l_uintptr_t             sem_pending;
  173         l_uintptr_t             sem_pending_last;
  174         l_uintptr_t             undo;
  175         l_ushort                sem_nsems;
  176 }
  177 #if defined(__amd64__) && defined(COMPAT_LINUX32)
  178 __packed
  179 #endif
  180 ;
  181 
  182 struct l_shmid_ds {
  183         struct l_ipc_perm       shm_perm;
  184         l_int                   shm_segsz;
  185         l_time_t                shm_atime;
  186         l_time_t                shm_dtime;
  187         l_time_t                shm_ctime;
  188         l_ushort                shm_cpid;
  189         l_ushort                shm_lpid;
  190         l_short                 shm_nattch;
  191         l_ushort                private1;
  192         l_uintptr_t             private2;
  193         l_uintptr_t             private3;
  194 };
  195 
  196 static void
  197 linux_to_bsd_semid_ds(struct l_semid_ds *lsp, struct semid_ds *bsp)
  198 {
  199 
  200         linux_to_bsd_ipc_perm(&lsp->sem_perm, &bsp->sem_perm);
  201         bsp->sem_otime = lsp->sem_otime;
  202         bsp->sem_ctime = lsp->sem_ctime;
  203         bsp->sem_nsems = lsp->sem_nsems;
  204         bsp->sem_base = PTRIN(lsp->sem_base);
  205 }
  206 
  207 static void
  208 bsd_to_linux_semid_ds(struct semid_ds *bsp, struct l_semid_ds *lsp)
  209 {
  210 
  211         bsd_to_linux_ipc_perm(&bsp->sem_perm, &lsp->sem_perm);
  212         lsp->sem_otime = bsp->sem_otime;
  213         lsp->sem_ctime = bsp->sem_ctime;
  214         lsp->sem_nsems = bsp->sem_nsems;
  215         lsp->sem_base = PTROUT(bsp->sem_base);
  216 }
  217 
  218 static void
  219 linux_to_bsd_shmid_ds(struct l_shmid_ds *lsp, struct shmid_ds *bsp)
  220 {
  221 
  222         linux_to_bsd_ipc_perm(&lsp->shm_perm, &bsp->shm_perm);
  223         bsp->shm_segsz = lsp->shm_segsz;
  224         bsp->shm_lpid = lsp->shm_lpid;
  225         bsp->shm_cpid = lsp->shm_cpid;
  226         bsp->shm_nattch = lsp->shm_nattch;
  227         bsp->shm_atime = lsp->shm_atime;
  228         bsp->shm_dtime = lsp->shm_dtime;
  229         bsp->shm_ctime = lsp->shm_ctime;
  230 }
  231 
  232 static void
  233 bsd_to_linux_shmid_ds(struct shmid_ds *bsp, struct l_shmid_ds *lsp)
  234 {
  235 
  236         bsd_to_linux_ipc_perm(&bsp->shm_perm, &lsp->shm_perm);
  237         if (bsp->shm_segsz > INT_MAX)
  238                 lsp->shm_segsz = INT_MAX;
  239         else
  240                 lsp->shm_segsz = bsp->shm_segsz;
  241         lsp->shm_lpid = bsp->shm_lpid;
  242         lsp->shm_cpid = bsp->shm_cpid;
  243         if (bsp->shm_nattch > SHRT_MAX)
  244                 lsp->shm_nattch = SHRT_MAX;
  245         else
  246                 lsp->shm_nattch = bsp->shm_nattch;
  247         lsp->shm_atime = bsp->shm_atime;
  248         lsp->shm_dtime = bsp->shm_dtime;
  249         lsp->shm_ctime = bsp->shm_ctime;
  250         lsp->private3 = 0;
  251 }
  252 
  253 static void
  254 linux_to_bsd_msqid_ds(struct l_msqid_ds *lsp, struct msqid_ds *bsp)
  255 {
  256 
  257         linux_to_bsd_ipc_perm(&lsp->msg_perm, &bsp->msg_perm);
  258         bsp->msg_cbytes = lsp->msg_cbytes;
  259         bsp->msg_qnum = lsp->msg_qnum;
  260         bsp->msg_qbytes = lsp->msg_qbytes;
  261         bsp->msg_lspid = lsp->msg_lspid;
  262         bsp->msg_lrpid = lsp->msg_lrpid;
  263         bsp->msg_stime = lsp->msg_stime;
  264         bsp->msg_rtime = lsp->msg_rtime;
  265         bsp->msg_ctime = lsp->msg_ctime;
  266 }
  267 
  268 static void
  269 bsd_to_linux_msqid_ds(struct msqid_ds *bsp, struct l_msqid_ds *lsp)
  270 {
  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 static int
  360 linux_semid_pullup(l_int ver, struct l_semid_ds *linux_semid, caddr_t uaddr)
  361 {
  362         struct l_semid64_ds linux_semid64;
  363         int error;
  364 
  365         if (ver == LINUX_IPC_64) {
  366                 error = copyin(uaddr, &linux_semid64, sizeof(linux_semid64));
  367                 if (error != 0)
  368                         return (error);
  369 
  370                 bzero(linux_semid, sizeof(*linux_semid));
  371 
  372                 linux_semid->sem_perm.uid = linux_semid64.sem_perm.uid;
  373                 linux_semid->sem_perm.gid = linux_semid64.sem_perm.gid;
  374                 linux_semid->sem_perm.mode = linux_semid64.sem_perm.mode;
  375         } else
  376                 error = copyin(uaddr, linux_semid, sizeof(*linux_semid));
  377 
  378         return (error);
  379 }
  380 
  381 static int
  382 linux_semid_pushdown(l_int ver, struct l_semid_ds *linux_semid, caddr_t uaddr)
  383 {
  384         struct l_semid64_ds linux_semid64;
  385 
  386         if (ver == LINUX_IPC_64) {
  387                 bzero(&linux_semid64, sizeof(linux_semid64));
  388 
  389                 linux_ipc_perm_to_ipc64_perm(&linux_semid->sem_perm,
  390                     &linux_semid64.sem_perm);
  391 
  392                 linux_semid64.sem_otime = linux_semid->sem_otime;
  393                 linux_semid64.sem_ctime = linux_semid->sem_ctime;
  394                 linux_semid64.sem_nsems = linux_semid->sem_nsems;
  395 
  396                 return (copyout(&linux_semid64, uaddr, sizeof(linux_semid64)));
  397         } else
  398                 return (copyout(linux_semid, uaddr, sizeof(*linux_semid)));
  399 }
  400 
  401 static int
  402 linux_shmid_pullup(l_int ver, struct l_shmid_ds *linux_shmid, caddr_t uaddr)
  403 {
  404         struct l_shmid64_ds linux_shmid64;
  405         int error;
  406 
  407         if (ver == LINUX_IPC_64) {
  408                 error = copyin(uaddr, &linux_shmid64, sizeof(linux_shmid64));
  409                 if (error != 0)
  410                         return (error);
  411 
  412                 bzero(linux_shmid, sizeof(*linux_shmid));
  413 
  414                 linux_shmid->shm_perm.uid = linux_shmid64.shm_perm.uid;
  415                 linux_shmid->shm_perm.gid = linux_shmid64.shm_perm.gid;
  416                 linux_shmid->shm_perm.mode = linux_shmid64.shm_perm.mode;
  417         } else
  418                 error = copyin(uaddr, linux_shmid, sizeof(*linux_shmid));
  419 
  420         return (error);
  421 }
  422 
  423 static int
  424 linux_shmid_pushdown(l_int ver, struct l_shmid_ds *linux_shmid, caddr_t uaddr)
  425 {
  426         struct l_shmid64_ds linux_shmid64;
  427 
  428         /*
  429          * XXX: This is backwards and loses information in shm_nattch
  430          * and shm_segsz.  We should probably either expose the BSD
  431          * shmid structure directly and convert it to either the
  432          * non-64 or 64 variant directly or the code should always
  433          * convert to the 64 variant and then truncate values into the
  434          * non-64 variant if needed since the 64 variant has more
  435          * precision.
  436          */
  437         if (ver == LINUX_IPC_64) {
  438                 bzero(&linux_shmid64, sizeof(linux_shmid64));
  439 
  440                 linux_ipc_perm_to_ipc64_perm(&linux_shmid->shm_perm,
  441                     &linux_shmid64.shm_perm);
  442 
  443                 linux_shmid64.shm_segsz = linux_shmid->shm_segsz;
  444                 linux_shmid64.shm_atime = linux_shmid->shm_atime;
  445                 linux_shmid64.shm_dtime = linux_shmid->shm_dtime;
  446                 linux_shmid64.shm_ctime = linux_shmid->shm_ctime;
  447                 linux_shmid64.shm_cpid = linux_shmid->shm_cpid;
  448                 linux_shmid64.shm_lpid = linux_shmid->shm_lpid;
  449                 linux_shmid64.shm_nattch = linux_shmid->shm_nattch;
  450 
  451                 return (copyout(&linux_shmid64, uaddr, sizeof(linux_shmid64)));
  452         } else
  453                 return (copyout(linux_shmid, uaddr, sizeof(*linux_shmid)));
  454 }
  455 
  456 static int
  457 linux_shminfo_pushdown(l_int ver, struct l_shminfo *linux_shminfo,
  458     caddr_t uaddr)
  459 {
  460         struct l_shminfo64 linux_shminfo64;
  461 
  462         if (ver == LINUX_IPC_64) {
  463                 bzero(&linux_shminfo64, sizeof(linux_shminfo64));
  464 
  465                 linux_shminfo64.shmmax = linux_shminfo->shmmax;
  466                 linux_shminfo64.shmmin = linux_shminfo->shmmin;
  467                 linux_shminfo64.shmmni = linux_shminfo->shmmni;
  468                 linux_shminfo64.shmseg = linux_shminfo->shmseg;
  469                 linux_shminfo64.shmall = linux_shminfo->shmall;
  470 
  471                 return (copyout(&linux_shminfo64, uaddr,
  472                     sizeof(linux_shminfo64)));
  473         } else
  474                 return (copyout(linux_shminfo, uaddr, sizeof(*linux_shminfo)));
  475 }
  476 
  477 int
  478 linux_semop(struct thread *td, struct linux_semop_args *args)
  479 {
  480         struct semop_args /* {
  481         int     semid;
  482         struct  sembuf *sops;
  483         int             nsops;
  484         } */ bsd_args;
  485 
  486         bsd_args.semid = args->semid;
  487         bsd_args.sops = PTRIN(args->tsops);
  488         bsd_args.nsops = args->nsops;
  489         return (sys_semop(td, &bsd_args));
  490 }
  491 
  492 int
  493 linux_semget(struct thread *td, struct linux_semget_args *args)
  494 {
  495         struct semget_args /* {
  496         key_t   key;
  497         int             nsems;
  498         int             semflg;
  499         } */ bsd_args;
  500 
  501         if (args->nsems < 0)
  502                 return (EINVAL);
  503         bsd_args.key = args->key;
  504         bsd_args.nsems = args->nsems;
  505         bsd_args.semflg = args->semflg;
  506         return (sys_semget(td, &bsd_args));
  507 }
  508 
  509 int
  510 linux_semctl(struct thread *td, struct linux_semctl_args *args)
  511 {
  512         struct l_semid_ds linux_semid;
  513         struct l_seminfo linux_seminfo;
  514         struct semid_ds semid;
  515         union semun semun;
  516         register_t rval;
  517         int cmd, error;
  518 
  519         switch (args->cmd & ~LINUX_IPC_64) {
  520         case LINUX_IPC_RMID:
  521                 cmd = IPC_RMID;
  522                 break;
  523         case LINUX_GETNCNT:
  524                 cmd = GETNCNT;
  525                 break;
  526         case LINUX_GETPID:
  527                 cmd = GETPID;
  528                 break;
  529         case LINUX_GETVAL:
  530                 cmd = GETVAL;
  531                 break;
  532         case LINUX_GETZCNT:
  533                 cmd = GETZCNT;
  534                 break;
  535         case LINUX_SETVAL:
  536                 cmd = SETVAL;
  537                 semun.val = args->arg.val;
  538                 break;
  539         case LINUX_IPC_SET:
  540                 cmd = IPC_SET;
  541                 error = linux_semid_pullup(args->cmd & LINUX_IPC_64,
  542                     &linux_semid, PTRIN(args->arg.buf));
  543                 if (error)
  544                         return (error);
  545                 linux_to_bsd_semid_ds(&linux_semid, &semid);
  546                 semun.buf = &semid;
  547                 return (kern_semctl(td, args->semid, args->semnum, cmd, &semun,
  548                     td->td_retval));
  549         case LINUX_IPC_STAT:
  550         case LINUX_SEM_STAT:
  551                 if ((args->cmd & ~LINUX_IPC_64) == LINUX_IPC_STAT)
  552                         cmd = IPC_STAT;
  553                 else
  554                         cmd = SEM_STAT;
  555                 semun.buf = &semid;
  556                 error = kern_semctl(td, args->semid, args->semnum, cmd, &semun,
  557                     &rval);
  558                 if (error)
  559                         return (error);
  560                 bsd_to_linux_semid_ds(&semid, &linux_semid);
  561                 error = linux_semid_pushdown(args->cmd & LINUX_IPC_64,
  562                     &linux_semid, PTRIN(args->arg.buf));
  563                 if (error == 0)
  564                         td->td_retval[0] = (cmd == SEM_STAT) ? rval : 0;
  565                 return (error);
  566         case LINUX_IPC_INFO:
  567         case LINUX_SEM_INFO:
  568                 bcopy(&seminfo, &linux_seminfo.semmni, sizeof(linux_seminfo) -
  569                     sizeof(linux_seminfo.semmap) );
  570                 /*
  571                  * Linux does not use the semmap field but populates it with
  572                  * the defined value from SEMMAP, which really is redefined to
  573                  * SEMMNS, which they define as SEMMNI * SEMMSL.  Try to
  574                  * simulate this returning our dynamic semmns value.
  575                  */
  576                 linux_seminfo.semmap = linux_seminfo.semmns;
  577 /* XXX BSD equivalent?
  578 #define used_semids 10
  579 #define used_sems 10
  580                 linux_seminfo.semusz = used_semids;
  581                 linux_seminfo.semaem = used_sems;
  582 */
  583                 error = copyout(&linux_seminfo,
  584                     PTRIN(args->arg.buf), sizeof(linux_seminfo));
  585                 if (error)
  586                         return (error);
  587                 td->td_retval[0] = seminfo.semmni;
  588                 return (0);                     /* No need for __semctl call */
  589         case LINUX_GETALL:
  590                 cmd = GETALL;
  591                 semun.val = args->arg.val;
  592                 break;
  593         case LINUX_SETALL:
  594                 cmd = SETALL;
  595                 semun.val = args->arg.val;
  596                 break;
  597         default:
  598                 linux_msg(td, "ipc type %d is not implemented",
  599                   args->cmd & ~LINUX_IPC_64);
  600                 return (EINVAL);
  601         }
  602         return (kern_semctl(td, args->semid, args->semnum, cmd, &semun,
  603             td->td_retval));
  604 }
  605 
  606 int
  607 linux_msgsnd(struct thread *td, struct linux_msgsnd_args *args)
  608 {
  609         const void *msgp;
  610         long mtype;
  611         l_long lmtype;
  612         int error;
  613 
  614         if ((l_long)args->msgsz < 0 || args->msgsz > (l_long)msginfo.msgmax)
  615                 return (EINVAL);
  616         msgp = PTRIN(args->msgp);
  617         if ((error = copyin(msgp, &lmtype, sizeof(lmtype))) != 0)
  618                 return (error);
  619         mtype = (long)lmtype;
  620         return (kern_msgsnd(td, args->msqid,
  621             (const char *)msgp + sizeof(lmtype),
  622             args->msgsz, args->msgflg, mtype));
  623 }
  624 
  625 int
  626 linux_msgrcv(struct thread *td, struct linux_msgrcv_args *args)
  627 {
  628         void *msgp;
  629         long mtype;
  630         l_long lmtype;
  631         int error;
  632 
  633         if ((l_long)args->msgsz < 0 || args->msgsz > (l_long)msginfo.msgmax)
  634                 return (EINVAL);
  635         msgp = PTRIN(args->msgp);
  636         if ((error = kern_msgrcv(td, args->msqid,
  637             (char *)msgp + sizeof(lmtype), args->msgsz,
  638             args->msgtyp, args->msgflg, &mtype)) != 0)
  639                 return (error);
  640         lmtype = (l_long)mtype;
  641         return (copyout(&lmtype, msgp, sizeof(lmtype)));
  642 }
  643 
  644 int
  645 linux_msgget(struct thread *td, struct linux_msgget_args *args)
  646 {
  647         struct msgget_args /* {
  648                 key_t   key;
  649                 int     msgflg;
  650         } */ bsd_args;
  651 
  652         bsd_args.key = args->key;
  653         bsd_args.msgflg = args->msgflg;
  654         return (sys_msgget(td, &bsd_args));
  655 }
  656 
  657 int
  658 linux_msgctl(struct thread *td, struct linux_msgctl_args *args)
  659 {
  660         int error, bsd_cmd;
  661         struct l_msqid_ds linux_msqid;
  662         struct msqid_ds bsd_msqid;
  663 
  664         bsd_cmd = args->cmd & ~LINUX_IPC_64;
  665         switch (bsd_cmd) {
  666         case LINUX_IPC_INFO:
  667         case LINUX_MSG_INFO: {
  668                 struct l_msginfo linux_msginfo;
  669 
  670                 /*
  671                  * XXX MSG_INFO uses the same data structure but returns different
  672                  * dynamic counters in msgpool, msgmap, and msgtql fields.
  673                  */
  674                 linux_msginfo.msgpool = (long)msginfo.msgmni *
  675                     (long)msginfo.msgmnb / 1024L;       /* XXX MSG_INFO. */
  676                 linux_msginfo.msgmap = msginfo.msgmnb;  /* XXX MSG_INFO. */
  677                 linux_msginfo.msgmax = msginfo.msgmax;
  678                 linux_msginfo.msgmnb = msginfo.msgmnb;
  679                 linux_msginfo.msgmni = msginfo.msgmni;
  680                 linux_msginfo.msgssz = msginfo.msgssz;
  681                 linux_msginfo.msgtql = msginfo.msgtql;  /* XXX MSG_INFO. */
  682                 linux_msginfo.msgseg = msginfo.msgseg;
  683                 error = copyout(&linux_msginfo, PTRIN(args->buf),
  684                     sizeof(linux_msginfo));
  685                 if (error == 0)
  686                     td->td_retval[0] = msginfo.msgmni;  /* XXX */
  687 
  688                 return (error);
  689         }
  690 
  691         /* 
  692          * TODO: implement this 
  693          * case LINUX_MSG_STAT:
  694          */
  695         case LINUX_IPC_STAT:
  696                 /* NOTHING */
  697                 break;
  698 
  699         case LINUX_IPC_SET:
  700                 error = linux_msqid_pullup(args->cmd & LINUX_IPC_64,
  701                     &linux_msqid, PTRIN(args->buf));
  702                 if (error)
  703                         return (error);
  704                 linux_to_bsd_msqid_ds(&linux_msqid, &bsd_msqid);
  705                 break;
  706 
  707         case LINUX_IPC_RMID:
  708                 /* NOTHING */
  709                 break;
  710 
  711         default:
  712                 return (EINVAL);
  713                 break;
  714         }
  715 
  716         error = kern_msgctl(td, args->msqid, bsd_cmd, &bsd_msqid);
  717         if (error != 0)
  718                 if (bsd_cmd != LINUX_IPC_RMID || error != EINVAL)
  719                         return (error);
  720 
  721         if (bsd_cmd == LINUX_IPC_STAT) {
  722                 bsd_to_linux_msqid_ds(&bsd_msqid, &linux_msqid);
  723                 return (linux_msqid_pushdown(args->cmd & LINUX_IPC_64,
  724                     &linux_msqid, PTRIN(args->buf)));
  725         }
  726 
  727         return (0);
  728 }
  729 
  730 int
  731 linux_shmat(struct thread *td, struct linux_shmat_args *args)
  732 {
  733         struct shmat_args /* {
  734                 int shmid;
  735                 void *shmaddr;
  736                 int shmflg;
  737         } */ bsd_args;
  738         int error;
  739 #if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32))
  740         l_uintptr_t addr;
  741 #endif
  742 
  743         bsd_args.shmid = args->shmid;
  744         bsd_args.shmaddr = PTRIN(args->shmaddr);
  745         bsd_args.shmflg = args->shmflg;
  746         if ((error = sys_shmat(td, &bsd_args)))
  747                 return (error);
  748 #if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32))
  749         addr = td->td_retval[0];
  750         if ((error = copyout(&addr, PTRIN(args->raddr), sizeof(addr))))
  751                 return (error);
  752         td->td_retval[0] = 0;
  753 #endif
  754         return (0);
  755 }
  756 
  757 int
  758 linux_shmdt(struct thread *td, struct linux_shmdt_args *args)
  759 {
  760         struct shmdt_args /* {
  761                 void *shmaddr;
  762         } */ bsd_args;
  763 
  764         bsd_args.shmaddr = PTRIN(args->shmaddr);
  765         return (sys_shmdt(td, &bsd_args));
  766 }
  767 
  768 int
  769 linux_shmget(struct thread *td, struct linux_shmget_args *args)
  770 {
  771         struct shmget_args /* {
  772                 key_t key;
  773                 int size;
  774                 int shmflg;
  775         } */ bsd_args;
  776 
  777         bsd_args.key = args->key;
  778         bsd_args.size = args->size;
  779         bsd_args.shmflg = args->shmflg;
  780         return (sys_shmget(td, &bsd_args));
  781 }
  782 
  783 int
  784 linux_shmctl(struct thread *td, struct linux_shmctl_args *args)
  785 {
  786         struct l_shmid_ds linux_shmid;
  787         struct l_shminfo linux_shminfo;
  788         struct l_shm_info linux_shm_info;
  789         struct shmid_ds bsd_shmid;
  790         int error;
  791 
  792         switch (args->cmd & ~LINUX_IPC_64) {
  793 
  794         case LINUX_IPC_INFO: {
  795                 struct shminfo bsd_shminfo;
  796 
  797                 /* Perform shmctl wanting removed segments lookup */
  798                 error = kern_shmctl(td, args->shmid, IPC_INFO,
  799                     (void *)&bsd_shminfo, NULL);
  800                 if (error)
  801                         return (error);
  802 
  803                 bsd_to_linux_shminfo(&bsd_shminfo, &linux_shminfo);
  804 
  805                 return (linux_shminfo_pushdown(args->cmd & LINUX_IPC_64,
  806                     &linux_shminfo, PTRIN(args->buf)));
  807         }
  808 
  809         case LINUX_SHM_INFO: {
  810                 struct shm_info bsd_shm_info;
  811 
  812                 /* Perform shmctl wanting removed segments lookup */
  813                 error = kern_shmctl(td, args->shmid, SHM_INFO,
  814                     (void *)&bsd_shm_info, NULL);
  815                 if (error)
  816                         return (error);
  817 
  818                 bsd_to_linux_shm_info(&bsd_shm_info, &linux_shm_info);
  819 
  820                 return (copyout(&linux_shm_info, PTRIN(args->buf),
  821                     sizeof(struct l_shm_info)));
  822         }
  823 
  824         case LINUX_IPC_STAT:
  825                 /* Perform shmctl wanting removed segments lookup */
  826                 error = kern_shmctl(td, args->shmid, IPC_STAT,
  827                     (void *)&bsd_shmid, NULL);
  828                 if (error)
  829                         return (error);
  830                 
  831                 bsd_to_linux_shmid_ds(&bsd_shmid, &linux_shmid);
  832 
  833                 return (linux_shmid_pushdown(args->cmd & LINUX_IPC_64,
  834                     &linux_shmid, PTRIN(args->buf)));
  835 
  836         case LINUX_SHM_STAT:
  837                 /* Perform shmctl wanting removed segments lookup */
  838                 error = kern_shmctl(td, args->shmid, IPC_STAT,
  839                     (void *)&bsd_shmid, NULL);
  840                 if (error)
  841                         return (error);
  842                 
  843                 bsd_to_linux_shmid_ds(&bsd_shmid, &linux_shmid);
  844 
  845                 return (linux_shmid_pushdown(args->cmd & LINUX_IPC_64,
  846                     &linux_shmid, PTRIN(args->buf)));
  847 
  848         case LINUX_IPC_SET:
  849                 error = linux_shmid_pullup(args->cmd & LINUX_IPC_64,
  850                     &linux_shmid, PTRIN(args->buf));
  851                 if (error)
  852                         return (error);
  853 
  854                 linux_to_bsd_shmid_ds(&linux_shmid, &bsd_shmid);
  855 
  856                 /* Perform shmctl wanting removed segments lookup */
  857                 return (kern_shmctl(td, args->shmid, IPC_SET,
  858                     (void *)&bsd_shmid, NULL));
  859 
  860         case LINUX_IPC_RMID: {
  861                 void *buf;
  862 
  863                 if (args->buf == 0)
  864                         buf = NULL;
  865                 else {
  866                         error = linux_shmid_pullup(args->cmd & LINUX_IPC_64,
  867                             &linux_shmid, PTRIN(args->buf));
  868                         if (error)
  869                                 return (error);
  870                         linux_to_bsd_shmid_ds(&linux_shmid, &bsd_shmid);
  871                         buf = (void *)&bsd_shmid;
  872                 }
  873                 return (kern_shmctl(td, args->shmid, IPC_RMID, buf, NULL));
  874         }
  875 
  876         case LINUX_SHM_LOCK:
  877                 /* FALLTHROUGH */
  878         case LINUX_SHM_UNLOCK:
  879                 /* FALLTHROUGH */
  880         default:
  881                 linux_msg(td, "ipc type %d not implemented",
  882                     args->cmd & ~LINUX_IPC_64);
  883                 return (EINVAL);
  884         }
  885 }
  886 
  887 MODULE_DEPEND(linux, sysvmsg, 1, 1, 1);
  888 MODULE_DEPEND(linux, sysvsem, 1, 1, 1);
  889 MODULE_DEPEND(linux, sysvshm, 1, 1, 1);

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