NetBSD/sys/compat/linux/linux_ipc.c

704 lines
18 KiB
C

/* $NetBSD: linux_ipc.c,v 1.6 1995/08/15 21:14:32 fvdl Exp $ */
/*
* Copyright (c) 1995 Frank van der Linden
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed for the NetBSD Project
* by Frank van der Linden
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/types.h>
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/shm.h>
#include <sys/sem.h>
#include <sys/msg.h>
#include <sys/proc.h>
#include <sys/uio.h>
#include <sys/time.h>
#include <sys/malloc.h>
#include <sys/mman.h>
#include <sys/systm.h>
#include <sys/stat.h>
#include <sys/mount.h>
#include <sys/syscallargs.h>
#include <compat/linux/linux_types.h>
#include <compat/linux/linux_signal.h>
#include <compat/linux/linux_syscallargs.h>
#include <compat/linux/linux_util.h>
#include <compat/linux/linux_ipc.h>
#include <compat/linux/linux_msg.h>
#include <compat/linux/linux_shm.h>
#include <compat/linux/linux_sem.h>
#include <compat/linux/linux_ipccall.h>
/*
* Stuff to deal with the SysV ipc/shm/semaphore interface in Linux.
* The main difference is, that Linux handles it all via one
* system call, which has the usual maximum amount of 5 arguments.
* This results in a kludge for calls that take 6 of them.
*
* The SYSVXXXX options have to be enabled to get the appropriate
* functions to work.
*/
#ifdef SYSVSEM
static int linux_semop __P((struct proc *, struct linux_ipc_args *,
register_t *));
static int linux_semget __P((struct proc *, struct linux_ipc_args *,
register_t *));
static int linux_semctl __P((struct proc *, struct linux_ipc_args *,
register_t *));
#endif
#ifdef SYSVMSG
static int linux_msgsnd __P((struct proc *, struct linux_ipc_args *,
register_t *));
static int linux_msgrcv __P((struct proc *, struct linux_ipc_args *,
register_t *));
static int linux_msgop __P((struct proc *, struct linux_ipc_args *,
register_t *));
static int linux_msgctl __P((struct proc *, struct linux_ipc_args *,
register_t *));
#endif
#ifdef SYSVSHM
static int linux_shmat __P((struct proc *, struct linux_ipc_args *,
register_t *));
static int linux_shmdt __P((struct proc *, struct linux_ipc_args *,
register_t *));
static int linux_shmget __P((struct proc *, struct linux_ipc_args *,
register_t *));
static int linux_shmctl __P((struct proc *, struct linux_ipc_args *,
register_t *));
#endif
int
linux_ipc(p, uap, retval)
struct proc *p;
struct linux_ipc_args /* {
syscallarg(int) what;
syscallarg(int) a1;
syscallarg(int) a2;
syscallarg(int) a3;
syscallarg(caddr_t) ptr;
} */ *uap;
register_t *retval;
{
int what, error;
switch (SCARG(uap, what)) {
#ifdef SYSVSEM
case LINUX_SYS_semop:
return linux_semop(p, uap, retval);
case LINUX_SYS_semget:
return linux_semget(p, uap, retval);
case LINUX_SYS_semctl:
return linux_semctl(p, uap, retval);
#endif
#ifdef SYSVMSG
case LINUX_SYS_msgsnd:
return linux_msgsnd(p, uap, retval);
case LINUX_SYS_msgrcv:
return linux_msgrcv(p, uap, retval);
case LINUX_SYS_msgget:
return linux_msgget(p, uap, retval);
case LINUX_SYS_msgctl:
return linux_msgctl(p, uap, retval);
#endif
#ifdef SYSVSHM
case LINUX_SYS_shmat:
return linux_shmat(p, uap, retval);
case LINUX_SYS_shmdt:
return linux_shmdt(p, uap, retval);
case LINUX_SYS_shmget:
return linux_shmget(p, uap, retval);
case LINUX_SYS_shmctl:
return linux_shmctl(p, uap, retval);
#endif
default:
return ENOSYS;
}
}
/*
* Convert between Linux and NetBSD ipc_perm structures. Only the
* order of the fields is different.
*/
static void
linux_to_bsd_ipc_perm(lpp, bpp)
struct linux_ipc_perm *lpp;
struct ipc_perm *bpp;
{
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;
}
static void
bsd_to_linux_ipc_perm(bpp, lpp)
struct ipc_perm *bpp;
struct linux_ipc_perm *lpp;
{
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;
}
#ifdef SYSVSEM
/*
* Semaphore operations. Most constants and structures are the same on
* both systems. Only semctl() needs some extra work.
*/
/*
* Convert between Linux and NetBSD semid_ds structures.
*/
static void
bsd_to_linux_semid_ds(bs, ls)
struct semid_ds *bs;
struct linux_semid_ds *ls;
{
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;
}
static void
linux_to_bsd_semid_ds(ls, bs)
struct linux_semid_ds *ls;
struct semid_ds *bs;
{
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;
}
int
linux_semop(p, uap, retval)
struct proc *p;
struct linux_ipc_args /* {
syscallarg(int) what;
syscallarg(int) a1;
syscallarg(int) a2;
syscallarg(int) a3;
syscallarg(caddr_t) ptr;
} */ *uap;
register_t *retval;
{
struct semop_args bsa;
SCARG(&bsa, semid) = SCARG(uap, a1);
SCARG(&bsa, sops) = (struct sembuf *)SCARG(uap, ptr);
SCARG(&bsa, nsops) = SCARG(uap, a2);
return semop(p, &bsa, retval);
}
int
linux_semget(p, uap, retval)
struct proc *p;
struct linux_ipc_args /* {
syscallarg(int) what;
syscallarg(int) a1;
syscallarg(int) a2;
syscallarg(int) a3;
syscallarg(caddr_t) ptr;
} */ *uap;
register_t *retval;
{
struct semget_args bsa;
SCARG(&bsa, key) = (key_t)SCARG(uap, a1);
SCARG(&bsa, nsems) = SCARG(uap, a2);
SCARG(&bsa, semflg) = SCARG(uap, a3);
return semget(p, &bsa, retval);
}
/*
* Most of this can be handled by directly passing the arguments on,
* buf IPC_* require a lot of copy{in,out} because of the extra indirection
* (we are passed a pointer to a union cointaining a pointer to a semid_ds
* structure.
*/
int
linux_semctl(p, uap, retval)
struct proc *p;
struct linux_ipc_args /* {
syscallarg(int) what;
syscallarg(int) a1;
syscallarg(int) a2;
syscallarg(int) a3;
syscallarg(caddr_t) ptr;
} */ *uap;
register_t *retval;
{
caddr_t sg, unptr, dsp, ldsp;
int error, cmd;
struct __semctl_args bsa;
struct linux_semid_ds lm;
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);
switch(SCARG(uap, a3)) {
case LINUX_GETVAL:
cmd = GETVAL;
break;
case LINUX_GETPID:
cmd = GETPID;
break;
case LINUX_GETNCNT:
cmd = GETNCNT;
break;
case LINUX_GETZCNT:
cmd = GETZCNT;
break;
case LINUX_SETVAL:
cmd = SETVAL;
break;
case LINUX_IPC_RMID:
cmd = IPC_RMID;
break;
case LINUX_IPC_SET:
if ((error = copyin(SCARG(uap, ptr), &ldsp, sizeof ldsp)))
return error;
if ((error = copyin(ldsp, (caddr_t)&lm, sizeof lm)))
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));
if ((error = copyout((caddr_t)&bm, dsp, sizeof bm)))
return error;
if ((error = copyout((caddr_t)&dsp, unptr, sizeof dsp)))
return error;
SCARG(&bsa, arg) = (union semun *)unptr;
return __semctl(p, &bsa, retval);
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));
if ((error = copyout((caddr_t)&dsp, unptr, sizeof dsp)))
return error;
SCARG(&bsa, arg) = (union semun *)unptr;
if ((error = __semctl(p, &bsa, retval)))
return error;
if ((error = copyin(dsp, (caddr_t)&bm, sizeof bm)))
return error;
bsd_to_linux_semid_ds(&bm, &lm);
if ((error = copyin(SCARG(uap, ptr), &ldsp, sizeof ldsp)))
return error;
return copyout((caddr_t)&lm, ldsp, sizeof lm);
default:
return EINVAL;
}
SCARG(&bsa, cmd) = cmd;
return __semctl(p, &bsa, retval);
}
#endif /* SYSVSEM */
#ifdef SYSVMSG
static void
linux_to_bsd_msqid_ds(lmp, bmp)
struct linux_msqid_ds *lmp;
struct msqid_ds *bmp;
{
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;
}
static void
bsd_to_linux_msqid_ds(bmp, lmp)
struct msqid_ds *bmp;
struct linux_msqid_ds *lmp;
{
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;
}
int
linux_msgsnd(p, uap, retval)
struct proc *p;
struct linux_ipc_args /* {
syscallarg(int) what;
syscallarg(int) a1;
syscallarg(int) a2;
syscallarg(int) a3;
syscallarg(caddr_t) ptr;
} */ *uap;
register_t *retval;
{
struct 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);
return msgsnd(p, &bma, retval);
}
int
linux_msgrcv(p, uap, retval)
struct proc *p;
struct linux_ipc_args /* {
syscallarg(int) what;
syscallarg(int) a1;
syscallarg(int) a2;
syscallarg(int) a3;
syscallarg(caddr_t) ptr;
} */ *uap;
register_t *retval;
{
struct msgrcv_args bma;
struct linux_msgrcv_msgarg kluge;
int error;
if ((error = copyin(SCARG(uap, ptr), &kluge, sizeof kluge)))
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);
return msgrcv(p, &bma, retval);
}
int
linux_msgget(p, uap, retval)
struct proc *p;
struct linux_ipc_args /* {
syscallarg(int) what;
syscallarg(int) a1;
syscallarg(int) a2;
syscallarg(int) a3;
syscallarg(caddr_t) ptr;
} */ *uap;
register_t *retval;
{
struct msgget_args bma;
SCARG(&bma, key) = (key_t)SCARG(uap, a1);
SCARG(&bma, msgflg) = SCARG(uap, a2);
return msgget(p, &bma, retval);
}
int
linux_msgctl(p, uap, retval)
struct proc *p;
struct linux_ipc_args /* {
syscallarg(int) what;
syscallarg(int) a1;
syscallarg(int) a2;
syscallarg(int) a3;
syscallarg(caddr_t) ptr;
} */ *uap;
register_t *retval;
{
struct msgctl_args bma;
caddr_t umsgptr, sg;
struct linux_msqid_ds lm;
struct msqid_ds bm;
int error;
SCARG(&bma, msqid) = SCARG(uap, a1);
SCARG(&bma, cmd) = SCARG(uap, a2);
switch (SCARG(uap, a2)) {
case LINUX_IPC_RMID:
return msgctl(p, &bma, retval);
case LINUX_IPC_SET:
if ((error = copyin(SCARG(uap, ptr), (caddr_t)&lm, sizeof lm)))
return error;
linux_to_bsd_msqid_ds(&lm, &bm);
sg = stackgap_init(p->p_emul);
umsgptr = stackgap_alloc(&sg, sizeof bm);
if ((error = copyout((caddr_t)&bm, umsgptr, sizeof bm)))
return error;
SCARG(&bma, buf) = (struct msqid_ds *)umsgptr;
return msgctl(p, &bma, retval);
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;
if ((error = msgctl(p, &bma, retval)))
return error;
if ((error = copyin(umsgptr, (caddr_t)&bm, sizeof bm)))
return error;
bsd_to_linux_msqid_ds(&bm, &lm);
return copyout((caddr_t)&lm, SCARG(uap, ptr), sizeof lm);
}
return EINVAL;
}
#endif /* SYSVMSG */
#ifdef SYSVSHM
/*
* shmat(2). Very straightforward, except that Linux passes a pointer
* in which the return value is to be passed. This is subsequently
* handled by libc, apparently.
*/
int
linux_shmat(p, uap, retval)
struct proc *p;
struct linux_ipc_args /* {
syscallarg(int) what;
syscallarg(int) a1;
syscallarg(int) a2;
syscallarg(int) a3;
syscallarg(caddr_t) ptr;
} */ *uap;
register_t *retval;
{
struct shmat_args bsa;
int error;
SCARG(&bsa, shmid) = SCARG(uap, a1);
SCARG(&bsa, shmaddr) = SCARG(uap, ptr);
SCARG(&bsa, shmflg) = SCARG(uap, a2);
if ((error = shmat(p, &bsa, retval)))
return error;
if ((error = copyout(&retval[0], (caddr_t) SCARG(uap, a3),
sizeof retval[0])))
return error;
retval[0] = 0;
return 0;
}
/*
* shmdt(): this could have been mapped directly, if it wasn't for
* the extra indirection by the linux_ipc system call.
*/
int
linux_shmdt(p, uap, retval)
struct proc *p;
struct linux_ipc_args /* {
syscallarg(int) what;
syscallarg(int) a1;
syscallarg(int) a2;
syscallarg(int) a3;
syscallarg(caddr_t) ptr;
} */ *uap;
register_t *retval;
{
struct shmdt_args bsa;
SCARG(&bsa, shmaddr) = SCARG(uap, ptr);
return shmdt(p, &bsa, retval);
}
/*
* Same story as shmdt.
*/
int
linux_shmget(p, uap, retval)
struct proc *p;
struct linux_ipc_args /* {
syscallarg(int) what;
syscallarg(int) a1;
syscallarg(int) a2;
syscallarg(int) a3;
syscallarg(caddr_t) ptr;
} */ *uap;
register_t *retval;
{
struct shmget_args bsa;
SCARG(&bsa, key) = SCARG(uap, a1);
SCARG(&bsa, size) = SCARG(uap, a2);
SCARG(&bsa, shmflg) = SCARG(uap, a3);
return shmget(p, &bsa, retval);
}
/*
* Convert between Linux and NetBSD shmid_ds structures.
* The order of the fields is once again the difference, and
* we also need a place to store the internal data pointer
* in, which is unfortunately stored in this structure.
*
* We abuse a Linux internal field for that.
*/
static void
linux_to_bsd_shmid_ds(lsp, bsp)
struct linux_shmid_ds *lsp;
struct shmid_ds *bsp;
{
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. */
}
static void
bsd_to_linux_shmid_ds(bsp, lsp)
struct shmid_ds *bsp;
struct linux_shmid_ds *lsp;
{
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 */
}
/*
* shmctl. Not implemented (for now): IPC_INFO, SHM_INFO, SHM_STAT
* SHM_LOCK and SHM_UNLOCK are passed on, but currently not implemented
* by NetBSD itself.
*
* The usual structure conversion and massaging is done.
*/
int
linux_shmctl(p, uap, retval)
struct proc *p;
struct linux_ipc_args /* {
syscallarg(int) what;
syscallarg(int) a1;
syscallarg(int) a2;
syscallarg(int) a3;
syscallarg(caddr_t) ptr;
} */ *uap;
register_t *retval;
{
int error;
caddr_t sg;
struct shmctl_args bsa;
struct shmid_ds *bsp, bs;
struct linux_shmid_ds lseg;
switch (SCARG(uap, a2)) {
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;
if ((error = shmctl(p, &bsa, retval)))
return error;
if ((error = copyin((caddr_t) &bs, (caddr_t) bsp, sizeof bs)))
return error;
bsd_to_linux_shmid_ds(&bs, &lseg);
return copyout((caddr_t) &lseg, SCARG(uap, ptr), sizeof lseg);
case LINUX_IPC_SET:
if ((error = copyin(SCARG(uap, ptr), (caddr_t) &lseg,
sizeof lseg)))
return error;
linux_to_bsd_shmid_ds(&lseg, &bs);
sg = stackgap_init(p->p_emul);
bsp = stackgap_alloc(&sg, sizeof (struct shmid_ds));
if ((error = copyout((caddr_t) &bs, (caddr_t) bsp, sizeof bs)))
return error;
SCARG(&bsa, shmid) = SCARG(uap, a1);
SCARG(&bsa, cmd) = IPC_SET;
SCARG(&bsa, buf) = bsp;
return shmctl(p, &bsa, retval);
case LINUX_IPC_RMID:
case LINUX_SHM_LOCK:
case LINUX_SHM_UNLOCK:
SCARG(&bsa, shmid) = SCARG(uap, a1);
switch (SCARG(uap, a2)) {
case LINUX_IPC_RMID:
SCARG(&bsa, cmd) = IPC_RMID;
break;
case LINUX_SHM_LOCK:
SCARG(&bsa, cmd) = SHM_LOCK;
break;
case LINUX_SHM_UNLOCK:
SCARG(&bsa, cmd) = SHM_UNLOCK;
break;
}
if ((error = copyin(SCARG(uap, ptr), (caddr_t) &lseg,
sizeof lseg)))
return error;
linux_to_bsd_shmid_ds(&lseg, &bs);
sg = stackgap_init(p->p_emul);
bsp = stackgap_alloc(&sg, sizeof (struct shmid_ds));
if ((error = copyout((caddr_t) &bs, (caddr_t) bsp, sizeof bs)))
return error;
SCARG(&bsa, buf) = bsp;
return shmctl(p, &bsa, retval);
case LINUX_IPC_INFO:
case LINUX_SHM_STAT:
case LINUX_SHM_INFO:
default:
return EINVAL;
}
}
#endif /* SYSVSHM */