494 lines
12 KiB
C
494 lines
12 KiB
C
/* $NetBSD: linux_ipc.c,v 1.1 1995/02/28 23:25:03 fvdl Exp $ */
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/*
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* Copyright (c) 1995 Frank van der Linden
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed for the NetBSD Project
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* by Frank van der Linden
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/types.h>
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/shm.h>
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#include <sys/msg.h>
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#include <sys/proc.h>
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#include <sys/uio.h>
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#include <sys/time.h>
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#include <sys/malloc.h>
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#include <sys/mman.h>
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#include <sys/systm.h>
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#include <sys/stat.h>
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#include <sys/mount.h>
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#include <sys/syscallargs.h>
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#include <compat/linux/linux_types.h>
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#include <compat/linux/linux_syscallargs.h>
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#include <compat/linux/linux_util.h>
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#include <compat/linux/linux_ipc.h>
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#include <compat/linux/linux_msg.h>
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#include <compat/linux/linux_shm.h>
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#include <compat/linux/linux_ipccall.h>
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/*
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* Stuff to deal with the SysV ipc/shm/semaphore interface in Linux.
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* The main difference is, that Linux handles it all via one
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* system call, which has the usual maximum amount of 5 arguments.
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* This results in a kludge for calls that take 6 of them.
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*
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* The SYSVXXXX options have to be enabled to get the appropriate
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* functions to work.
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*/
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#ifdef SYSVSEM
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static int linux_semop __P((struct proc *, struct linux_ipc_args *,
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register_t *));
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static int linux_semget __P((struct proc *, struct linux_ipc_args *,
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register_t *));
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static int linux_semctl __P((struct proc *, struct linux_ipc_args *,
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register_t *));
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#endif
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#ifdef SYSVMSG
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static int linux_msgsnd __P((struct proc *, struct linux_ipc_args *,
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register_t *));
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static int linux_msgrcv __P((struct proc *, struct linux_ipc_args *,
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register_t *));
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static int linux_msgop __P((struct proc *, struct linux_ipc_args *,
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register_t *));
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static int linux_msgctl __P((struct proc *, struct linux_ipc_args *,
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register_t *));
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#endif
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#ifdef SYSVSHM
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static int linux_shmat __P((struct proc *, struct linux_ipc_args *,
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register_t *));
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static int linux_shmdt __P((struct proc *, struct linux_ipc_args *,
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register_t *));
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static int linux_shmget __P((struct proc *, struct linux_ipc_args *,
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register_t *));
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static int linux_shmctl __P((struct proc *, struct linux_ipc_args *,
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register_t *));
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#endif
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int
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linux_ipc(p, uap, retval)
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struct proc *p;
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struct linux_ipc_args /* {
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syscallarg(int) what;
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syscallarg(int) a1;
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syscallarg(int) a2;
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syscallarg(int) a3;
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syscallarg(caddr_t) ptr;
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} */ *uap;
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register_t *retval;
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{
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int what, error;
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switch (SCARG(uap, what)) {
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#ifdef SYSVSEM
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case LINUX_SYS_semop:
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return linux_semop(p, uap, retval);
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case LINUX_SYS_semget:
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return linux_semget(p, uap, retval);
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case LINUX_SYS_semctl:
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return linux_semctl(p, uap, retval);
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#endif
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#ifdef SYSVMSG
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case LINUX_SYS_msgsnd:
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return linux_msgsnd(p, uap, retval);
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case LINUX_SYS_msgrcv:
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return linux_msgrcv(p, uap, retval);
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case LINUX_SYS_msgget:
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return linux_msgget(p, uap, retval);
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case LINUX_SYS_msgctl:
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return linux_msgctl(p, uap, retval);
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#endif
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#ifdef SYSVSHM
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case LINUX_SYS_shmat:
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return linux_shmat(p, uap, retval);
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case LINUX_SYS_shmdt:
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return linux_shmdt(p, uap, retval);
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case LINUX_SYS_shmget:
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return linux_shmget(p, uap, retval);
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case LINUX_SYS_shmctl:
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return linux_shmctl(p, uap, retval);
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#endif
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default:
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return ENOSYS;
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}
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}
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/*
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* Convert between Linux and NetBSD ipc_perm structures. Only the
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* order of the fields is different.
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*/
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static void
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linux_to_bsd_ipc_perm(lpp, bpp)
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struct linux_ipc_perm *lpp;
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struct ipc_perm *bpp;
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{
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bpp->key = lpp->l_key;
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bpp->uid = lpp->l_uid;
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bpp->gid = lpp->l_gid;
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bpp->cuid = lpp->l_cuid;
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bpp->cgid = lpp->l_cgid;
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bpp->mode = lpp->l_mode;
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bpp->seq = lpp->l_seq;
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}
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static void
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bsd_to_linux_ipc_perm(bpp, lpp)
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struct ipc_perm *bpp;
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struct linux_ipc_perm *lpp;
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{
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lpp->l_key = bpp->key;
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lpp->l_uid = bpp->uid;
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lpp->l_gid = bpp->gid;
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lpp->l_cuid = bpp->cuid;
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lpp->l_cgid = bpp->cgid;
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lpp->l_mode = bpp->mode;
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lpp->l_seq = bpp->seq;
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}
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#ifdef SYSVSEM
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/*
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* Semaphore operations: not implemented yet.
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*/
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int
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linux_semop(p, uap, retval)
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struct proc *p;
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struct linux_ipc_args /* {
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syscallarg(int) what;
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syscallarg(int) a1;
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syscallarg(int) a2;
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syscallarg(int) a3;
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syscallarg(caddr_t) ptr;
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} */ *uap;
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register_t *retval;
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{
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return ENOSYS;
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}
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int
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linux_semget(p, uap, retval)
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struct proc *p;
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struct linux_ipc_args /* {
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syscallarg(int) what;
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syscallarg(int) a1;
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syscallarg(int) a2;
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syscallarg(int) a3;
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syscallarg(caddr_t) ptr;
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} */ *uap;
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register_t *retval;
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{
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return ENOSYS;
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}
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int
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linux_semctl(p, uap, retval)
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struct proc *p;
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struct linux_ipc_args /* {
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syscallarg(int) what;
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syscallarg(int) a1;
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syscallarg(int) a2;
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syscallarg(int) a3;
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syscallarg(caddr_t) ptr;
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} */ *uap;
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register_t *retval;
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{
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return ENOSYS;
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}
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#endif /* SYSVSEM */
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#ifdef SYSVMSG
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/*
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* Msg functions: not implemented yet.
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*/
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int
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linux_msgsnd(p, uap, retval)
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struct proc *p;
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struct linux_ipc_args /* {
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syscallarg(int) what;
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syscallarg(int) a1;
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syscallarg(int) a2;
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syscallarg(int) a3;
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syscallarg(caddr_t) ptr;
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} */ *uap;
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register_t *retval;
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{
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return ENOSYS;
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}
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int
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linux_msgrcv(p, uap, retval)
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struct proc *p;
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struct linux_ipc_args /* {
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syscallarg(int) what;
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syscallarg(int) a1;
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syscallarg(int) a2;
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syscallarg(int) a3;
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syscallarg(caddr_t) ptr;
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} */ *uap;
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register_t *retval;
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{
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return ENOSYS;
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}
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int
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linux_msgget(p, uap, retval)
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struct proc *p;
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struct linux_ipc_args /* {
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syscallarg(int) what;
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syscallarg(int) a1;
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syscallarg(int) a2;
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syscallarg(int) a3;
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syscallarg(caddr_t) ptr;
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} */ *uap;
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register_t *retval;
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{
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return ENOSYS;
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}
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int
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linux_msgctl(p, uap, retval)
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struct proc *p;
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struct linux_ipc_args /* {
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syscallarg(int) what;
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syscallarg(int) a1;
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syscallarg(int) a2;
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syscallarg(int) a3;
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syscallarg(caddr_t) ptr;
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} */ *uap;
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register_t *retval;
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{
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return ENOSYS;
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}
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#endif /* SYSVMSG */
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#ifdef SYSVSHM
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/*
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* shmat(2). Very straightforward, except that Linux passes a pointer
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* in which the return value is to be passed. This is subsequently
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* handled by libc, apparently.
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*/
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int
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linux_shmat(p, uap, retval)
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struct proc *p;
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struct linux_ipc_args /* {
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syscallarg(int) what;
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syscallarg(int) a1;
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syscallarg(int) a2;
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syscallarg(int) a3;
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syscallarg(caddr_t) ptr;
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} */ *uap;
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register_t *retval;
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{
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struct shmat_args bsa;
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int error;
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SCARG(&bsa, shmid) = SCARG(uap, a1);
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SCARG(&bsa, shmaddr) = SCARG(uap, ptr);
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SCARG(&bsa, shmflg) = SCARG(uap, a2);
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if ((error = shmat(p, &bsa, retval)))
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return error;
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if ((error = copyout(&retval[0], (caddr_t) SCARG(uap, a3),
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sizeof retval[0])))
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return error;
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retval[0] = 0;
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return 0;
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}
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/*
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* shmdt(): this could have been mapped directly, if it wasn't for
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* the extra indirection by the linux_ipc system call.
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*/
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int
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linux_shmdt(p, uap, retval)
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struct proc *p;
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struct linux_ipc_args /* {
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syscallarg(int) what;
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syscallarg(int) a1;
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syscallarg(int) a2;
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syscallarg(int) a3;
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syscallarg(caddr_t) ptr;
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} */ *uap;
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register_t *retval;
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{
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struct shmdt_args bsa;
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SCARG(&bsa, shmaddr) = SCARG(uap, ptr);
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return shmdt(p, &bsa, retval);
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}
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/*
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* Same story as shmdt.
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*/
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int
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linux_shmget(p, uap, retval)
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struct proc *p;
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struct linux_ipc_args /* {
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syscallarg(int) what;
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syscallarg(int) a1;
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syscallarg(int) a2;
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syscallarg(int) a3;
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syscallarg(caddr_t) ptr;
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} */ *uap;
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register_t *retval;
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{
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struct shmget_args bsa;
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SCARG(&bsa, key) = SCARG(uap, a1);
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SCARG(&bsa, size) = SCARG(uap, a2);
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SCARG(&bsa, shmflg) = SCARG(uap, a3);
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return shmget(p, &bsa, retval);
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}
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/*
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* Convert between Linux and NetBSD shmid_ds structures.
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* The order of the fields is once again the difference, and
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* we also need a place to store the internal data pointer
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* in, which is unfortunately stored in this structure.
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*
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* We abuse a Linux internal field for that.
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*/
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static void
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linux_to_bsd_shmid_ds(lsp, bsp)
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struct linux_shmid_ds *lsp;
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struct shmid_ds *bsp;
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{
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linux_to_bsd_ipc_perm(&lsp->l_shm_perm, &bsp->shm_perm);
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bsp->shm_segsz = lsp->l_shm_segsz;
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bsp->shm_lpid = lsp->l_shm_lpid;
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bsp->shm_cpid = lsp->l_shm_cpid;
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bsp->shm_nattch = lsp->l_shm_nattch;
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bsp->shm_atime = lsp->l_shm_atime;
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bsp->shm_dtime = lsp->l_shm_dtime;
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bsp->shm_ctime = lsp->l_shm_ctime;
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bsp->shm_internal = lsp->l_private2; /* XXX Oh well. */
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}
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static void
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bsd_to_linux_shmid_ds(bsp, lsp)
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struct shmid_ds *bsp;
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struct linux_shmid_ds *lsp;
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{
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bsd_to_linux_ipc_perm(&bsp->shm_perm, &lsp->l_shm_perm);
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lsp->l_shm_segsz = bsp->shm_segsz;
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lsp->l_shm_lpid = bsp->shm_lpid;
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lsp->l_shm_cpid = bsp->shm_cpid;
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lsp->l_shm_nattch = bsp->shm_nattch;
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lsp->l_shm_atime = bsp->shm_atime;
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lsp->l_shm_dtime = bsp->shm_dtime;
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lsp->l_shm_ctime = bsp->shm_ctime;
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lsp->l_private2 = bsp->shm_internal; /* XXX */
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}
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/*
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* shmctl. Not implemented (for now): IPC_INFO, SHM_INFO, SHM_STAT
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* SHM_LOCK and SHM_UNLOCK are passed on, but currently not implemented
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* by NetBSD itself.
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*
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* The usual structure conversion and massaging is done.
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*/
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int
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linux_shmctl(p, uap, retval)
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struct proc *p;
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struct linux_ipc_args /* {
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syscallarg(int) what;
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syscallarg(int) a1;
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syscallarg(int) a2;
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syscallarg(int) a3;
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syscallarg(caddr_t) ptr;
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} */ *uap;
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register_t *retval;
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{
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int error;
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caddr_t sg;
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struct shmctl_args bsa;
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struct shmid_ds *bsp, bs;
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struct linux_shmid_ds lseg;
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switch (SCARG(uap, a2)) {
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case LINUX_IPC_STAT:
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sg = stackgap_init();
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bsp = stackgap_alloc(&sg, sizeof (struct shmid_ds));
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SCARG(&bsa, shmid) = SCARG(uap, a1);
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SCARG(&bsa, cmd) = IPC_STAT;
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SCARG(&bsa, buf) = bsp;
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if ((error = shmctl(p, &bsa, retval)))
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return error;
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if ((error = copyin((caddr_t) &bs, (caddr_t) bsp, sizeof bs)))
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return error;
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bsd_to_linux_shmid_ds(&bs, &lseg);
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return copyout((caddr_t) &lseg, SCARG(uap, ptr), sizeof lseg);
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case LINUX_IPC_SET:
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if ((error = copyin(SCARG(uap, ptr), (caddr_t) &lseg,
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sizeof lseg)))
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return error;
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linux_to_bsd_shmid_ds(&lseg, &bs);
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sg = stackgap_init();
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bsp = stackgap_alloc(&sg, sizeof (struct shmid_ds));
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if ((error = copyout((caddr_t) &bs, (caddr_t) bsp, sizeof bs)))
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return error;
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SCARG(&bsa, shmid) = SCARG(uap, a1);
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SCARG(&bsa, cmd) = IPC_SET;
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SCARG(&bsa, buf) = bsp;
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return shmctl(p, &bsa, retval);
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case LINUX_IPC_RMID:
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case LINUX_SHM_LOCK:
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case LINUX_SHM_UNLOCK:
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SCARG(&bsa, shmid) = SCARG(uap, a1);
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switch (SCARG(uap, a2)) {
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case LINUX_IPC_RMID:
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SCARG(&bsa, cmd) = IPC_RMID;
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break;
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case LINUX_SHM_LOCK:
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SCARG(&bsa, cmd) = SHM_LOCK;
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break;
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case LINUX_SHM_UNLOCK:
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SCARG(&bsa, cmd) = SHM_UNLOCK;
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break;
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}
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SCARG(&bsa, buf) = (struct shmid_ds *) SCARG(uap, ptr);
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return shmctl(p, &bsa, retval);
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case LINUX_IPC_INFO:
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case LINUX_SHM_STAT:
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case LINUX_SHM_INFO:
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default:
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return EINVAL;
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}
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}
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#endif /* SYSVSHM */
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