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dabee6fecc
kern_fork.c: add the tiny bit of code for rfork operation. kern/sysv_*: shmfork() takes one less arg, it was never used. sys/shm.h: drop "isvfork" arg from shmfork() prototype sys/param.h: declare rfork args.. (this is where OpenBSD put it..) sys/filedesc.h: protos for fdshare/fdcopy. vm/vm_mmap.c: add minherit code, add rounding to mmap() type args where it makes sense. vm/*: drop unused isvfork arg. Note: this rfork() implementation copies the address space mappings, it does not connect the mappings together. ie: once the two processes have split, the pages may be shared, but the address space is not. If one does a mmap() etc, it does not appear in the other. This makes it not useful for pthreads, but it is useful in it's own right for having light-weight threads in a static shared address space. Obtained from: Original by Ron Minnich, extended by OpenBSD
298 lines
6.1 KiB
C
298 lines
6.1 KiB
C
/* $Id: sysv_ipc.c,v 1.3 1996/01/08 04:30:48 peter Exp $ */
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/* $NetBSD: sysv_ipc.c,v 1.7 1994/06/29 06:33:11 cgd Exp $ */
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/*
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* Copyright (c) 1994 Herb Peyerl <hpeyerl@novatel.ca>
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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 by Herb Peyerl.
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* 4. The name of Herb Peyerl 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 "opt_sysvipc.h"
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/proc.h>
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#include <sys/systm.h>
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#include <sys/syslog.h>
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#include <sys/sysproto.h>
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#include <sys/ipc.h>
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#include <sys/shm.h>
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#include <sys/sem.h>
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#if defined(SYSVSEM) || defined(SYSVSHM) || defined(SYSVMSG)
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/*
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* Check for ipc permission
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*/
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int
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ipcperm(cred, perm, mode)
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struct ucred *cred;
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struct ipc_perm *perm;
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int mode;
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{
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if (cred->cr_uid == 0)
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return (0);
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/* Check for user match. */
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if (cred->cr_uid != perm->cuid && cred->cr_uid != perm->uid) {
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if (mode & IPC_M)
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return (EPERM);
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/* Check for group match. */
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mode >>= 3;
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if (!groupmember(perm->gid, cred) &&
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!groupmember(perm->cgid, cred))
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/* Check for `other' match. */
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mode >>= 3;
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}
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if (mode & IPC_M)
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return (0);
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return ((mode & perm->mode) == mode ? 0 : EACCES);
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}
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#endif /* defined(SYSVSEM) || defined(SYSVSHM) || defined(SYSVMSG) */
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#if !defined(SYSVSEM) || !defined(SYSVSHM) || !defined(SYSVMSG)
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static void sysv_nosys __P((struct proc *p, char *s));
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static void
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sysv_nosys(p, s)
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struct proc *p;
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char *s;
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{
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log(LOG_ERR, "cmd %s pid %d tried to use non-present %s\n",
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p->p_comm, p->p_pid, s);
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}
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#if !defined(SYSVSEM)
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/*
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* SYSVSEM stubs
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*/
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int
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semsys(p, uap, retval)
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struct proc *p;
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struct semsys_args *uap;
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int *retval;
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{
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sysv_nosys(p, "SYSVSEM");
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return nosys(p, (struct nosys_args *)uap, retval);
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};
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int
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semconfig(p, uap, retval)
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struct proc *p;
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struct semconfig_args *uap;
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int *retval;
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{
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sysv_nosys(p, "SYSVSEM");
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return nosys(p, (struct nosys_args *)uap, retval);
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};
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int
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__semctl(p, uap, retval)
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struct proc *p;
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register struct __semctl_args *uap;
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int *retval;
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{
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sysv_nosys(p, "SYSVSEM");
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return nosys(p, (struct nosys_args *)uap, retval);
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};
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int
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semget(p, uap, retval)
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struct proc *p;
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register struct semget_args *uap;
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int *retval;
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{
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sysv_nosys(p, "SYSVSEM");
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return nosys(p, (struct nosys_args *)uap, retval);
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};
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int
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semop(p, uap, retval)
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struct proc *p;
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register struct semop_args *uap;
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int *retval;
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{
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sysv_nosys(p, "SYSVSEM");
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return nosys(p, (struct nosys_args *)uap, retval);
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};
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/* called from kern_exit.c */
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void
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semexit(p)
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struct proc *p;
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{
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return;
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}
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#endif /* !defined(SYSVSEM) */
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#if !defined(SYSVMSG)
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/*
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* SYSVMSG stubs
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*/
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int
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msgsys(p, uap, retval)
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struct proc *p;
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/* XXX actually varargs. */
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struct msgsys_args *uap;
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int *retval;
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{
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sysv_nosys(p, "SYSVMSG");
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return nosys(p, (struct nosys_args *)uap, retval);
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};
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int
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msgctl(p, uap, retval)
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struct proc *p;
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register struct msgctl_args *uap;
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int *retval;
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{
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sysv_nosys(p, "SYSVMSG");
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return nosys(p, (struct nosys_args *)uap, retval);
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};
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int
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msgget(p, uap, retval)
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struct proc *p;
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register struct msgget_args *uap;
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int *retval;
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{
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sysv_nosys(p, "SYSVMSG");
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return nosys(p, (struct nosys_args *)uap, retval);
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};
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int
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msgsnd(p, uap, retval)
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struct proc *p;
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register struct msgsnd_args *uap;
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int *retval;
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{
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sysv_nosys(p, "SYSVMSG");
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return nosys(p, (struct nosys_args *)uap, retval);
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};
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int
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msgrcv(p, uap, retval)
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struct proc *p;
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register struct msgrcv_args *uap;
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int *retval;
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{
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sysv_nosys(p, "SYSVMSG");
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return nosys(p, (struct nosys_args *)uap, retval);
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};
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#endif /* !defined(SYSVMSG) */
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#if !defined(SYSVSHM)
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/*
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* SYSVSHM stubs
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*/
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int
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shmdt(p, uap, retval)
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struct proc *p;
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struct shmdt_args *uap;
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int *retval;
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{
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sysv_nosys(p, "SYSVSHM");
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return nosys(p, (struct nosys_args *)uap, retval);
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};
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int
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shmat(p, uap, retval)
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struct proc *p;
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struct shmat_args *uap;
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int *retval;
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{
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sysv_nosys(p, "SYSVSHM");
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return nosys(p, (struct nosys_args *)uap, retval);
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};
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int
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shmctl(p, uap, retval)
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struct proc *p;
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struct shmctl_args *uap;
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int *retval;
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{
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sysv_nosys(p, "SYSVSHM");
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return nosys(p, (struct nosys_args *)uap, retval);
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};
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int
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shmget(p, uap, retval)
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struct proc *p;
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struct shmget_args *uap;
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int *retval;
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{
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sysv_nosys(p, "SYSVSHM");
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return nosys(p, (struct nosys_args *)uap, retval);
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};
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int
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shmsys(p, uap, retval)
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struct proc *p;
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/* XXX actually varargs. */
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struct shmsys_args *uap;
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int *retval;
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{
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sysv_nosys(p, "SYSVSHM");
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return nosys(p, (struct nosys_args *)uap, retval);
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};
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/* called from kern_fork.c */
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void
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shmfork(p1, p2)
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struct proc *p1, *p2;
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{
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return;
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}
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/* called from kern_exit.c */
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void
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shmexit(p)
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struct proc *p;
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{
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return;
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}
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#endif /* !defined(SYSVSHM) */
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#endif /* !defined(SYSVSEM) || !defined(SYSVSHM) || !defined(SYSVMSG) */
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