root/compat/linux/linux_ipc.c

DEFINITIONS

1. linux_sys_ipc
2. linux_to_bsd_ipc_perm
3. bsd_to_linux_ipc_perm
4. bsd_to_linux_semid_ds
5. linux_to_bsd_semid_ds
6. linux_semop
7. linux_semget
8. linux_semctl
9. linux_to_bsd_msqid_ds
10. bsd_to_linux_msqid_ds
11. linux_msgsnd
12. linux_msgrcv
13. linux_msgget
14. linux_msgctl
15. linux_shmat
16. linux_shmdt
17. linux_shmget
18. linux_to_bsd_shmid_ds
19. bsd_to_linux_shmid_ds
20. linux_shmctl

    1 /*      $OpenBSD: linux_ipc.c,v 1.10 2007/05/29 10:44:29 sturm Exp $    */
    2 /*      $NetBSD: linux_ipc.c,v 1.10 1996/04/05 00:01:44 christos Exp $  */
    4 /*
    5  * Copyright (c) 1995 Frank van der Linden
    6  * All rights reserved.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  * 3. All advertising materials mentioning features or use of this software
   17  *    must display the following acknowledgement:
   18  *      This product includes software developed for the NetBSD Project
   19  *      by Frank van der Linden
   20  * 4. The name of the author may not be used to endorse or promote products
   21  *    derived from this software without specific prior written permission
   22  *
   23  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   24  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   25  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   26  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   27  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   28  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   29  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   30  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   31  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   32  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   33  */
   35 #include <sys/types.h>
   36 #include <sys/param.h>
   37 #include <sys/kernel.h>
   38 #include <sys/shm.h>
   39 #include <sys/sem.h>
   40 #include <sys/msg.h>
   41 #include <sys/proc.h>
   42 #include <sys/uio.h>
   43 #include <sys/time.h>
   44 #include <sys/malloc.h>
   45 #include <sys/mman.h>
   46 #include <sys/systm.h>
   47 #include <sys/stat.h>
   49 #include <sys/mount.h>
   50 #include <sys/syscallargs.h>
   52 #include <compat/linux/linux_types.h>
   53 #include <compat/linux/linux_signal.h>
   54 #include <compat/linux/linux_syscallargs.h>
   55 #include <compat/linux/linux_util.h>
   56 #include <compat/linux/linux_ipc.h>
   57 #include <compat/linux/linux_msg.h>
   58 #include <compat/linux/linux_shm.h>
   59 #include <compat/linux/linux_sem.h>
   60 #include <compat/linux/linux_ipccall.h>
   62 /*
   63  * Stuff to deal with the SysV ipc/shm/semaphore interface in Linux.
   64  * The main difference is, that Linux handles it all via one
   65  * system call, which has the usual maximum amount of 5 arguments.
   66  * This results in a kludge for calls that take 6 of them.
   67  *
   68  * The SYSVXXXX options have to be enabled to get the appropriate
   69  * functions to work.
   70  */
   72 #ifdef SYSVSEM
   73 int linux_semop(struct proc *, void *, register_t *);
   74 int linux_semget(struct proc *, void *, register_t *);
   75 int linux_semctl(struct proc *, void *, register_t *);
   76 void bsd_to_linux_semid_ds(struct semid_ds *, struct linux_semid_ds *);
   77 void linux_to_bsd_semid_ds(struct linux_semid_ds *, struct semid_ds *);
   78 #endif
   80 #ifdef SYSVMSG
   81 int linux_msgsnd(struct proc *, void *, register_t *);
   82 int linux_msgrcv(struct proc *, void *, register_t *);
   83 int linux_msgget(struct proc *, void *, register_t *);
   84 int linux_msgctl(struct proc *, void *, register_t *);
   85 void linux_to_bsd_msqid_ds(struct linux_msqid_ds *, struct msqid_ds *);
   86 void bsd_to_linux_msqid_ds(struct msqid_ds *, struct linux_msqid_ds *);
   87 #endif
   89 #ifdef SYSVSHM
   90 int linux_shmat(struct proc *, void *, register_t *);
   91 int linux_shmdt(struct proc *, void *, register_t *);
   92 int linux_shmget(struct proc *, void *, register_t *);
   93 int linux_shmctl(struct proc *, void *, register_t *);
   94 void linux_to_bsd_shmid_ds(struct linux_shmid_ds *, struct shmid_ds *);
   95 void bsd_to_linux_shmid_ds(struct shmid_ds *, struct linux_shmid_ds *);
   96 #endif
   98 #if defined(SYSVMSG) || defined(SYSVSEM) || defined(SYSVSHM)
   99 void linux_to_bsd_ipc_perm(struct linux_ipc_perm *, struct ipc_perm *);
  100 void bsd_to_linux_ipc_perm(struct ipc_perm *, struct linux_ipc_perm *);
  101 #endif
  103 int
linux_sys_ipc(p, v, retval)
  105         struct proc *p;
  106         void *v;
register_t *retval;
  108 {
  109         struct linux_sys_ipc_args /* {
  110                 syscallarg(int) what;
  111                 syscallarg(int) a1;
  112                 syscallarg(int) a2;
  113                 syscallarg(int) a3;
  114                 syscallarg(caddr_t) ptr;
  115         } */ *uap = v;
  117         switch (SCARG(uap, what)) {
  118 #ifdef SYSVSEM
  119         case LINUX_SYS_semop:
  120                 return linux_semop(p, uap, retval);
  121         case LINUX_SYS_semget:
  122                 return linux_semget(p, uap, retval);
  123         case LINUX_SYS_semctl:
  124                 return linux_semctl(p, uap, retval);
  125 #endif
  126 #ifdef SYSVMSG
  127         case LINUX_SYS_msgsnd:
  128                 return linux_msgsnd(p, uap, retval);
  129         case LINUX_SYS_msgrcv:
  130                 return linux_msgrcv(p, uap, retval);
  131         case LINUX_SYS_msgget:
  132                 return linux_msgget(p, uap, retval);
  133         case LINUX_SYS_msgctl:
  134                 return linux_msgctl(p, uap, retval);
  135 #endif
  136 #ifdef SYSVSHM
  137         case LINUX_SYS_shmat:
  138                 return linux_shmat(p, uap, retval);
  139         case LINUX_SYS_shmdt:
  140                 return linux_shmdt(p, uap, retval);
  141         case LINUX_SYS_shmget:
  142                 return linux_shmget(p, uap, retval);
  143         case LINUX_SYS_shmctl:
  144                 return linux_shmctl(p, uap, retval);
  145 #endif
  146         default:
  147                 return ENOSYS;
  148         }
  149 }
  151 #if defined(SYSVMSG) || defined(SYSVSEM) || defined(SYSVSHM)
  152 /*
  153  * Convert between Linux and OpenBSD ipc_perm structures. Only the
  154  * order of the fields is different.
  155  */
  156 void
linux_to_bsd_ipc_perm(lpp, bpp)
  158         struct linux_ipc_perm *lpp;
  159         struct ipc_perm *bpp;
  160 {
bpp->key = lpp->l_key;
bpp->uid = lpp->l_uid;
bpp->gid = lpp->l_gid;
bpp->cuid = lpp->l_cuid;
bpp->cgid = lpp->l_cgid;
bpp->mode = lpp->l_mode;
bpp->seq = lpp->l_seq;
  169 }
  171 void
bsd_to_linux_ipc_perm(bpp, lpp)
  173         struct ipc_perm *bpp;
  174         struct linux_ipc_perm *lpp;
  175 {
lpp->l_key = bpp->key;
lpp->l_uid = bpp->uid;
lpp->l_gid = bpp->gid;
lpp->l_cuid = bpp->cuid;
lpp->l_cgid = bpp->cgid;
lpp->l_mode = bpp->mode;
lpp->l_seq = bpp->seq;
  184 }
  185 #endif
  187 #ifdef SYSVSEM
  188 /*
  189  * Semaphore operations. Most constants and structures are the same on
  190  * both systems. Only semctl() needs some extra work.
  191  */
  193 /*
  194  * Convert between Linux and OpenBSD semid_ds structures.
  195  */
  196 void
bsd_to_linux_semid_ds(bs, ls)
  198         struct semid_ds *bs;
  199         struct linux_semid_ds *ls;
  200 {
bsd_to_linux_ipc_perm(&bs->sem_perm, &ls->l_sem_perm);
ls->l_sem_otime = bs->sem_otime;
ls->l_sem_ctime = bs->sem_ctime;
ls->l_sem_nsems = bs->sem_nsems;
ls->l_sem_base = bs->sem_base;
  207 }
  209 void
linux_to_bsd_semid_ds(ls, bs)
  211         struct linux_semid_ds *ls;
  212         struct semid_ds *bs;
  213 {
linux_to_bsd_ipc_perm(&ls->l_sem_perm, &bs->sem_perm);
bs->sem_otime = ls->l_sem_otime;
bs->sem_ctime = ls->l_sem_ctime;
bs->sem_nsems = ls->l_sem_nsems;
bs->sem_base = ls->l_sem_base;
  220 }
  222 int
linux_semop(p, v, retval)
  224         struct proc *p;
  225         void *v;
register_t *retval;
  227 {
  228         struct linux_sys_ipc_args /* {
  229                 syscallarg(int) what;
  230                 syscallarg(int) a1;
  231                 syscallarg(int) a2;
  232                 syscallarg(int) a3;
  233                 syscallarg(caddr_t) ptr;
  234         } */ *uap = v;
  235         struct sys_semop_args bsa;
SCARG(&bsa, semid) = SCARG(uap, a1);
SCARG(&bsa, sops) = (struct sembuf *)SCARG(uap, ptr);
SCARG(&bsa, nsops) = SCARG(uap, a2);
  241         return sys_semop(p, &bsa, retval);
  242 }
  244 int
linux_semget(p, v, retval)
  246         struct proc *p;
  247         void *v;
register_t *retval;
  249 {
  250         struct linux_sys_ipc_args /* {
  251                 syscallarg(int) what;
  252                 syscallarg(int) a1;
  253                 syscallarg(int) a2;
  254                 syscallarg(int) a3;
  255                 syscallarg(caddr_t) ptr;
  256         } */ *uap = v;
  257         struct sys_semget_args bsa;
SCARG(&bsa, key) = (key_t)SCARG(uap, a1);
SCARG(&bsa, nsems) = SCARG(uap, a2);
SCARG(&bsa, semflg) = SCARG(uap, a3);
  263         return sys_semget(p, &bsa, retval);
  264 }
  266 /*
  267  * Most of this can be handled by directly passing the arguments on,
  268  * buf IPC_* require a lot of copy{in,out} because of the extra indirection
  269  * (we are passed a pointer to a union cointaining a pointer to a semid_ds
  270  * structure.
  271  */
  272 int
linux_semctl(p, v, retval)
  274         struct proc *p;
  275         void *v;
register_t *retval;
  277 {
  278         struct linux_sys_ipc_args /* {
  279                 syscallarg(int) what;
  280                 syscallarg(int) a1;
  281                 syscallarg(int) a2;
  282                 syscallarg(int) a3;
  283                 syscallarg(caddr_t) ptr;
  284         } */ *uap = v;
caddr_t sg, unptr, dsp, ldsp;
  286         int error, cmd;
  287         struct sys___semctl_args bsa;
  288         struct linux_semid_ds lm;
  289         struct semid_ds bm;
SCARG(&bsa, semid) = SCARG(uap, a1);
SCARG(&bsa, semnum) = SCARG(uap, a2);
SCARG(&bsa, cmd) = SCARG(uap, a3);
SCARG(&bsa, arg) = (union semun *)SCARG(uap, ptr);
  295         switch(SCARG(uap, a3)) {
  296         case LINUX_GETVAL:
cmd = GETVAL;
  298                 break;
  299         case LINUX_GETPID:
cmd = GETPID;
  301                 break;
  302         case LINUX_GETNCNT:
cmd = GETNCNT;
  304                 break;
  305         case LINUX_GETZCNT:
cmd = GETZCNT;
  307                 break;
  308         case LINUX_SETVAL:
cmd = SETVAL;
  310                 break;
  311         case LINUX_IPC_RMID:
cmd = IPC_RMID;
  313                 break;
  314         case LINUX_IPC_SET:
  315                 if ((error = copyin(SCARG(uap, ptr), &ldsp, sizeof ldsp)))
  316                         return error;
  317                 if ((error = copyin(ldsp, (caddr_t)&lm, sizeof lm)))
  318                         return error;
linux_to_bsd_semid_ds(&lm, &bm);
sg = stackgap_init(p->p_emul);
unptr = stackgap_alloc(&sg, sizeof (union semun));
dsp = stackgap_alloc(&sg, sizeof (struct semid_ds));
  323                 if ((error = copyout((caddr_t)&bm, dsp, sizeof bm)))
  324                         return error;
  325                 if ((error = copyout((caddr_t)&dsp, unptr, sizeof dsp)))
  326                         return error;
SCARG(&bsa, arg) = (union semun *)unptr;
  328                 return sys___semctl(p, &bsa, retval);
  329         case LINUX_IPC_STAT:
sg = stackgap_init(p->p_emul);
unptr = stackgap_alloc(&sg, sizeof (union semun *));
dsp = stackgap_alloc(&sg, sizeof (struct semid_ds));
  333                 if ((error = copyout((caddr_t)&dsp, unptr, sizeof dsp)))
  334                         return error;
SCARG(&bsa, arg) = (union semun *)unptr;
  336                 if ((error = sys___semctl(p, &bsa, retval)))
  337                         return error;
  338                 if ((error = copyin(dsp, (caddr_t)&bm, sizeof bm)))
  339                         return error;
bsd_to_linux_semid_ds(&bm, &lm);
  341                 if ((error = copyin(SCARG(uap, ptr), &ldsp, sizeof ldsp)))
  342                         return error;
  343                 return copyout((caddr_t)&lm, ldsp, sizeof lm);
  344         default:
  345                 return EINVAL;
  346         }
SCARG(&bsa, cmd) = cmd;
  349         return sys___semctl(p, &bsa, retval);
  350 }
  351 #endif /* SYSVSEM */
  353 #ifdef SYSVMSG
  355 void
linux_to_bsd_msqid_ds(lmp, bmp)
  357         struct linux_msqid_ds *lmp;
  358         struct msqid_ds *bmp;
  359 {
linux_to_bsd_ipc_perm(&lmp->l_msg_perm, &bmp->msg_perm);
bmp->msg_first = lmp->l_msg_first;
bmp->msg_last = lmp->l_msg_last;
bmp->msg_cbytes = lmp->l_msg_cbytes;
bmp->msg_qnum = lmp->l_msg_qnum;
bmp->msg_qbytes = lmp->l_msg_qbytes;
bmp->msg_lspid = lmp->l_msg_lspid;
bmp->msg_lrpid = lmp->l_msg_lrpid;
bmp->msg_stime = lmp->l_msg_stime;
bmp->msg_rtime = lmp->l_msg_rtime;
bmp->msg_ctime = lmp->l_msg_ctime;
  372 }
  374 void
bsd_to_linux_msqid_ds(bmp, lmp)
  376         struct msqid_ds *bmp;
  377         struct linux_msqid_ds *lmp;
  378 {
bsd_to_linux_ipc_perm(&bmp->msg_perm, &lmp->l_msg_perm);
lmp->l_msg_first = bmp->msg_first;
lmp->l_msg_last = bmp->msg_last;
lmp->l_msg_cbytes = bmp->msg_cbytes;
lmp->l_msg_qnum = bmp->msg_qnum;
lmp->l_msg_qbytes = bmp->msg_qbytes;
lmp->l_msg_lspid = bmp->msg_lspid;
lmp->l_msg_lrpid = bmp->msg_lrpid;
lmp->l_msg_stime = bmp->msg_stime;
lmp->l_msg_rtime = bmp->msg_rtime;
lmp->l_msg_ctime = bmp->msg_ctime;
  391 }
  393 int
linux_msgsnd(p, v, retval)
  395         struct proc *p;
  396         void *v;
register_t *retval;
  398 {
  399         struct linux_sys_ipc_args /* {
  400                 syscallarg(int) what;
  401                 syscallarg(int) a1;
  402                 syscallarg(int) a2;
  403                 syscallarg(int) a3;
  404                 syscallarg(caddr_t) ptr;
  405         } */ *uap = v;
  406         struct sys_msgsnd_args bma;
SCARG(&bma, msqid) = SCARG(uap, a1);
SCARG(&bma, msgp) = SCARG(uap, ptr);
SCARG(&bma, msgsz) = SCARG(uap, a2);
SCARG(&bma, msgflg) = SCARG(uap, a3);
  413         return sys_msgsnd(p, &bma, retval);
  414 }
  416 int
linux_msgrcv(p, v, retval)
  418         struct proc *p;
  419         void *v;
register_t *retval;
  421 {
  422         struct linux_sys_ipc_args /* {
  423                 syscallarg(int) what;
  424                 syscallarg(int) a1;
  425                 syscallarg(int) a2;
  426                 syscallarg(int) a3;
  427                 syscallarg(caddr_t) ptr;
  428         } */ *uap = v;
  429         struct sys_msgrcv_args bma;
  430         struct linux_msgrcv_msgarg kluge;
  431         int error;
  433         if ((error = copyin(SCARG(uap, ptr), &kluge, sizeof kluge)))
  434                 return error;
SCARG(&bma, msqid) = SCARG(uap, a1);
SCARG(&bma, msgp) = kluge.msg;
SCARG(&bma, msgsz) = SCARG(uap, a2);
SCARG(&bma, msgtyp) = kluge.type;
SCARG(&bma, msgflg) = SCARG(uap, a3);
  442         return sys_msgrcv(p, &bma, retval);
  443 }
  445 int
linux_msgget(p, v, retval)
  447         struct proc *p;
  448         void *v;
register_t *retval;
  450 {
  451         struct linux_sys_ipc_args /* {
  452                 syscallarg(int) what;
  453                 syscallarg(int) a1;
  454                 syscallarg(int) a2;
  455                 syscallarg(int) a3;
  456                 syscallarg(caddr_t) ptr;
  457         } */ *uap = v;
  458         struct sys_msgget_args bma;
SCARG(&bma, key) = (key_t)SCARG(uap, a1);
SCARG(&bma, msgflg) = SCARG(uap, a2);
  463         return sys_msgget(p, &bma, retval);
  464 }
  466 int
linux_msgctl(p, v, retval)
  468         struct proc *p;
  469         void *v;
register_t *retval;
  471 {
  472         struct linux_sys_ipc_args /* {
  473                 syscallarg(int) what;
  474                 syscallarg(int) a1;
  475                 syscallarg(int) a2;
  476                 syscallarg(int) a3;
  477                 syscallarg(caddr_t) ptr;
  478         } */ *uap = v;
  479         struct sys_msgctl_args bma;
caddr_t umsgptr, sg;
  481         struct linux_msqid_ds lm;
  482         struct msqid_ds bm;
  483         int error;
SCARG(&bma, msqid) = SCARG(uap, a1);
SCARG(&bma, cmd) = SCARG(uap, a2);
  487         switch (SCARG(uap, a2)) {
  488         case LINUX_IPC_RMID:
  489                 return sys_msgctl(p, &bma, retval);
  490         case LINUX_IPC_SET:
  491                 if ((error = copyin(SCARG(uap, ptr), (caddr_t)&lm, sizeof lm)))
  492                         return error;
linux_to_bsd_msqid_ds(&lm, &bm);
sg = stackgap_init(p->p_emul);
umsgptr = stackgap_alloc(&sg, sizeof bm);
  496                 if ((error = copyout((caddr_t)&bm, umsgptr, sizeof bm)))
  497                         return error;
SCARG(&bma, buf) = (struct msqid_ds *)umsgptr;
  499                 return sys_msgctl(p, &bma, retval);
  500         case LINUX_IPC_STAT:
sg = stackgap_init(p->p_emul);
umsgptr = stackgap_alloc(&sg, sizeof (struct msqid_ds));
SCARG(&bma, buf) = (struct msqid_ds *)umsgptr;
  504                 if ((error = sys_msgctl(p, &bma, retval)))
  505                         return error;
  506                 if ((error = copyin(umsgptr, (caddr_t)&bm, sizeof bm)))
  507                         return error;
bsd_to_linux_msqid_ds(&bm, &lm);
  509                 return copyout((caddr_t)&lm, SCARG(uap, ptr), sizeof lm);
  510         }
  511         return EINVAL;
  512 }
  513 #endif /* SYSVMSG */
  515 #ifdef SYSVSHM
  516 /*
  517  * shmat(2). Very straightforward, except that Linux passes a pointer
  518  * in which the return value is to be passed. This is subsequently
  519  * handled by libc, apparently.
  520  */
  521 int
linux_shmat(p, v, retval)
  523         struct proc *p;
  524         void *v;
register_t *retval;
  526 {
  527         struct linux_sys_ipc_args /* {
  528                 syscallarg(int) what;
  529                 syscallarg(int) a1;
  530                 syscallarg(int) a2;
  531                 syscallarg(int) a3;
  532                 syscallarg(caddr_t) ptr;
  533         } */ *uap = v;
  534         struct sys_shmat_args bsa;
  535         int error;
SCARG(&bsa, shmid) = SCARG(uap, a1);
SCARG(&bsa, shmaddr) = SCARG(uap, ptr);
SCARG(&bsa, shmflg) = SCARG(uap, a2);
  541         if ((error = sys_shmat(p, &bsa, retval)))
  542                 return error;
  544         if ((error = copyout(&retval[0], (caddr_t) SCARG(uap, a3),
  545              sizeof retval[0])))
  546                 return error;
retval[0] = 0;
  549         return 0;
  550 }
  552 /*
  553  * shmdt(): this could have been mapped directly, if it wasn't for
  554  * the extra indirection by the linux_ipc system call.
  555  */
  556 int
linux_shmdt(p, v, retval)
  558         struct proc *p;
  559         void *v;
register_t *retval;
  561 {
  562         struct linux_sys_ipc_args /* {
  563                 syscallarg(int) what;
  564                 syscallarg(int) a1;
  565                 syscallarg(int) a2;
  566                 syscallarg(int) a3;
  567                 syscallarg(caddr_t) ptr;
  568         } */ *uap = v;
  569         struct sys_shmdt_args bsa;
SCARG(&bsa, shmaddr) = SCARG(uap, ptr);
  573         return sys_shmdt(p, &bsa, retval);
  574 }
  576 /*
  577  * Same story as shmdt.
  578  */
  579 int
linux_shmget(p, v, retval)
  581         struct proc *p;
  582         void *v;
register_t *retval;
  584 {
  585         struct linux_sys_ipc_args /* {
  586                 syscallarg(int) what;
  587                 syscallarg(int) a1;
  588                 syscallarg(int) a2;
  589                 syscallarg(int) a3;
  590                 syscallarg(caddr_t) ptr;
  591         } */ *uap = v;
  592         struct sys_shmget_args bsa;
SCARG(&bsa, key) = SCARG(uap, a1);
SCARG(&bsa, size) = SCARG(uap, a2);
SCARG(&bsa, shmflg) = SCARG(uap, a3);
SCARG(&bsa, shmflg) |= _SHM_RMLINGER;
  600         return sys_shmget(p, &bsa, retval);
  601 }
  603 /*
  604  * Convert between Linux and OpenBSD shmid_ds structures.
  605  * The order of the fields is once again the difference, and
  606  * we also need a place to store the internal data pointer
  607  * in, which is unfortunately stored in this structure.
  608  *
  609  * We abuse a Linux internal field for that.
  610  */
  611 void
linux_to_bsd_shmid_ds(lsp, bsp)
  613         struct linux_shmid_ds *lsp;
  614         struct shmid_ds *bsp;
  615 {
linux_to_bsd_ipc_perm(&lsp->l_shm_perm, &bsp->shm_perm);
bsp->shm_segsz = lsp->l_shm_segsz;
bsp->shm_lpid = lsp->l_shm_lpid;
bsp->shm_cpid = lsp->l_shm_cpid;
bsp->shm_nattch = lsp->l_shm_nattch;
bsp->shm_atime = lsp->l_shm_atime;
bsp->shm_dtime = lsp->l_shm_dtime;
bsp->shm_ctime = lsp->l_shm_ctime;
bsp->shm_internal = lsp->l_private2;    /* XXX Oh well. */
  626 }
  628 void
bsd_to_linux_shmid_ds(bsp, lsp)
  630         struct shmid_ds *bsp;
  631         struct linux_shmid_ds *lsp;
  632 {
bsd_to_linux_ipc_perm(&bsp->shm_perm, &lsp->l_shm_perm);
lsp->l_shm_segsz = bsp->shm_segsz;
lsp->l_shm_lpid = bsp->shm_lpid;
lsp->l_shm_cpid = bsp->shm_cpid;
lsp->l_shm_nattch = bsp->shm_nattch;
lsp->l_shm_atime = bsp->shm_atime;
lsp->l_shm_dtime = bsp->shm_dtime;
lsp->l_shm_ctime = bsp->shm_ctime;
lsp->l_private2 = bsp->shm_internal;    /* XXX */
  643 }
  645 /*
  646  * shmctl. Not implemented (for now): IPC_INFO, SHM_INFO, SHM_STAT
  647  * SHM_LOCK and SHM_UNLOCK are passed on, but currently not implemented
  648  * by OpenBSD itself.
  649  *
  650  * The usual structure conversion and massaging is done.
  651  */
  652 int
linux_shmctl(p, v, retval)
  654         struct proc *p;
  655         void *v;
register_t *retval;
  657 {
  658         struct linux_sys_ipc_args /* {
  659                 syscallarg(int) what;
  660                 syscallarg(int) a1;
  661                 syscallarg(int) a2;
  662                 syscallarg(int) a3;
  663                 syscallarg(caddr_t) ptr;
  664         } */ *uap = v;
  665         int error;
caddr_t sg;
  667         struct sys_shmctl_args bsa;
  668         struct shmid_ds *bsp, bs;
  669         struct linux_shmid_ds lseg;
  671         switch (SCARG(uap, a2)) {
  672         case LINUX_IPC_STAT:
sg = stackgap_init(p->p_emul);
bsp = stackgap_alloc(&sg, sizeof (struct shmid_ds));
SCARG(&bsa, shmid) = SCARG(uap, a1);
SCARG(&bsa, cmd) = IPC_STAT;
SCARG(&bsa, buf) = bsp;
  678                 if ((error = sys_shmctl(p, &bsa, retval)))
  679                         return error;
  680                 if ((error = copyin((caddr_t) bsp, (caddr_t) &bs, sizeof bs)))
  681                         return error;
bsd_to_linux_shmid_ds(&bs, &lseg);
  683                 return copyout((caddr_t) &lseg, SCARG(uap, ptr), sizeof lseg);
  684         case LINUX_IPC_SET:
  685                 if ((error = copyin(SCARG(uap, ptr), (caddr_t) &lseg,
  686                      sizeof lseg)))
  687                         return error;
linux_to_bsd_shmid_ds(&lseg, &bs);
sg = stackgap_init(p->p_emul);
bsp = stackgap_alloc(&sg, sizeof (struct shmid_ds));
  691                 if ((error = copyout((caddr_t) &bs, (caddr_t) bsp, sizeof bs)))
  692                         return error;
SCARG(&bsa, shmid) = SCARG(uap, a1);
SCARG(&bsa, cmd) = IPC_SET;
SCARG(&bsa, buf) = bsp;
  696                 return sys_shmctl(p, &bsa, retval);
  697         case LINUX_IPC_RMID:
  698         case LINUX_SHM_LOCK:
  699         case LINUX_SHM_UNLOCK:
SCARG(&bsa, shmid) = SCARG(uap, a1);
  701                 switch (SCARG(uap, a2)) {
  702                 case LINUX_IPC_RMID:
SCARG(&bsa, cmd) = IPC_RMID;
  704                         break;
  705                 case LINUX_SHM_LOCK:
SCARG(&bsa, cmd) = SHM_LOCK;
  707                         break;
  708                 case LINUX_SHM_UNLOCK:
SCARG(&bsa, cmd) = SHM_UNLOCK;
  710                         break;
  711                 }
SCARG(&bsa, buf) = NULL;
  713                 return sys_shmctl(p, &bsa, retval);
  714         case LINUX_IPC_INFO:
  715         case LINUX_SHM_STAT:
  716         case LINUX_SHM_INFO:
  717         default:
  718                 return EINVAL;
  719         }
  720 }
  721 #endif /* SYSVSHM */