e03e9e8086
doing a cpu_set_kpc(), just pass the entry point and argument all the way down the fork path starting with fork1(). In order to avoid special-casing the normal fork in every cpu_fork(), MI code passes down child_return() and the child process pointer explicitly. This fixes a race condition on multiprocessor systems; a CPU could grab the newly created processes (which has been placed on a run queue) before cpu_set_kpc() would be performed.
283 lines
7.1 KiB
C
283 lines
7.1 KiB
C
/* $NetBSD: svr4_lwp.c,v 1.3 2000/05/28 05:49:05 thorpej Exp $ */
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/*-
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* Copyright (c) 1999 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Christos Zoulas.
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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 the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/systm.h>
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#include <sys/queue.h>
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#include <sys/mbuf.h>
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#include <sys/file.h>
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#include <sys/mount.h>
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#include <sys/time.h>
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#include <sys/resourcevar.h>
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#include <sys/proc.h>
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#include <sys/user.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <sys/syscallargs.h>
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#include <sys/un.h>
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#include <sys/stat.h>
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#include <compat/svr4/svr4_types.h>
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#include <compat/svr4/svr4_util.h>
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#include <compat/svr4/svr4_socket.h>
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#include <compat/svr4/svr4_signal.h>
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#include <compat/svr4/svr4_sockmod.h>
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#include <compat/svr4/svr4_lwp.h>
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#include <compat/svr4/svr4_ucontext.h>
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#include <compat/svr4/svr4_syscallargs.h>
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int
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svr4_sys__lwp_self(p, v, retval)
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struct proc *p;
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void *v;
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register_t *retval;
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{
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return sys_getpid(p, v, retval);
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}
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int
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svr4_sys__lwp_create(p, v, retval)
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struct proc *p;
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void *v;
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register_t *retval;
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{
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struct svr4_sys__lwp_create_args *uap = v;
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int error;
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struct proc *pt;
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svr4_ucontext_t uc;
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#define SVR4_FORK_FLAGS \
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(FORK_SHAREVM|FORK_SHARECWD|FORK_SHAREFILES|FORK_SHARESIGS)
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if ((error = fork1(p, SVR4_FORK_FLAGS, SIGCHLD, NULL, 0,
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NULL, NULL, retval, &pt)) == -1)
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return error;
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if (SCARG(uap, flags) & SVR4_LWP_DETACHED)
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pt->p_flag &= ~P_CONTROLT;
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if (SCARG(uap, flags) & SVR4_LWP_SUSPENDED)
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pt->p_stat = SSTOP;
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if (SCARG(uap, flags) & SVR4___LWP_ASLWP) {
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/*
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* XXX: This does not really work, we don't have
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* the facility to deliver all async signals
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* to a single lwp, and also we don't keep
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* track of having only one ASLWP. For now
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* we just block all signals as we are supposed
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* to.
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*/
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sigset_t ss;
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sigfillset(&ss);
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(void)sigprocmask1(pt, SIG_BLOCK, &ss, 0);
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} else {
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/*
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* XXX: We block all signals to the rest of the of
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* the lwp's, so that they don't get confused
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* as of the above. Will that work? What does
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* sharing s
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*/
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sigset_t ss;
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sigfillset(&ss);
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(void)sigprocmask1(pt, SIG_BLOCK, &ss, 0);
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}
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if ((error = copyin(SCARG(uap, uc), &uc, sizeof(uc))) != 0)
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return error;
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if ((error = svr4_setcontext(pt, &uc)) != 0)
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return error;
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if ((error = copyout(&pt->p_pid, SCARG(uap, lwpid),
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sizeof(svr4_lwpid_t))) == -1)
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return error;
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return 0;
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}
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int
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svr4_sys__lwp_kill(p, v, retval)
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struct proc *p;
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void *v;
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register_t *retval;
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{
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struct svr4_sys__lwp_kill_args *uap = v;
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struct sys_kill_args ap;
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SCARG(&ap, pid) = SCARG(uap, lwpid);
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SCARG(&ap, signum) = SCARG(uap, signum);
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return sys_kill(p, &ap, retval);
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}
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int
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svr4_sys__lwp_info(p, v, retval)
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struct proc *p;
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void *v;
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register_t *retval;
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{
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struct svr4_sys__lwp_info_args *uap = v;
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struct svr4_lwpinfo lwpinfo;
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int error;
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TIMEVAL_TO_TIMESPEC(&p->p_stats->p_ru.ru_stime, &lwpinfo.lwp_stime);
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TIMEVAL_TO_TIMESPEC(&p->p_stats->p_ru.ru_utime, &lwpinfo.lwp_utime);
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if ((error = copyout(&lwpinfo, SCARG(uap, lwpinfo), sizeof(lwpinfo))) ==
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-1)
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return error;
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return 0;
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}
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int
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svr4_sys__lwp_exit(p, v, retval)
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struct proc *p;
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void *v;
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register_t *retval;
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{
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struct sys_exit_args ap;
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int error;
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/* XXX: We don't handle the suspended case correctly here */
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SCARG(&ap, rval) = 0;
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if ((error = sys_exit(p, &ap, retval)) == -1)
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return error;
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*retval = 0;
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return 0;
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}
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int
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svr4_sys__lwp_wait(p, v, retval)
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struct proc *p;
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void *v;
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register_t *retval;
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{
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struct svr4_sys__lwp_wait_args *uap = v;
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struct sys_wait4_args ap;
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int error;
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SCARG(&ap, pid) = SCARG(uap, wait_for);
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SCARG(&ap, status) = NULL;
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SCARG(&ap, options) = 0;
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if ((error = sys_wait4(p, &ap, retval)) == -1)
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return error;
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if (SCARG(uap, departed_lwp) != NULL)
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if ((error = copyout(retval, SCARG(uap, departed_lwp),
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sizeof(svr4_lwpid_t))) == -1)
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return error;
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*retval = 0;
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return 0;
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}
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/* XXX Stolen from kern_sig.c */
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#define CANSIGNAL(p, pc, q, signum) \
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((pc)->pc_ucred->cr_uid == 0 || \
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(pc)->p_ruid == (q)->p_cred->p_ruid || \
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(pc)->pc_ucred->cr_uid == (q)->p_cred->p_ruid || \
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(pc)->p_ruid == (q)->p_ucred->cr_uid || \
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(pc)->pc_ucred->cr_uid == (q)->p_ucred->cr_uid || \
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((signum) == SIGCONT && (q)->p_session == (p)->p_session))
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int
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svr4_sys__lwp_suspend(p, v, retval)
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struct proc *p;
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void *v;
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register_t *retval;
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{
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struct svr4_sys__lwp_suspend_args *uap = v;
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struct proc *pt;
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/* Security implications here! */
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if ((pt = pfind(SCARG(uap, lwpid))) == NULL)
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return ESRCH;
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if (!CANSIGNAL(p, p->p_cred, pt, 0))
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return EPERM;
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pt->p_stat = SSTOP;
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return 0;
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}
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int
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svr4_sys__lwp_continue(p, v, retval)
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struct proc *p;
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void *v;
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register_t *retval;
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{
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struct svr4_sys__lwp_continue_args *uap = v;
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struct proc *pt;
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if ((pt = pfind(SCARG(uap, lwpid))) == NULL)
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return ESRCH;
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if (!CANSIGNAL(p, p->p_cred, pt, 0))
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return EPERM;
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pt->p_stat = SRUN;
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return 0;
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}
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int
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svr4_sys__lwp_getprivate(p, v, retval)
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struct proc *p;
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void *v;
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register_t *retval;
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{
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/* XXX: Use mach field! */
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*retval = (register_t)p->p_thread;
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return 0;
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}
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int
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svr4_sys__lwp_setprivate(p, v, retval)
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struct proc *p;
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void *v;
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register_t *retval;
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{
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struct svr4_sys__lwp_setprivate_args *uap = v;
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/* XXX: Use mach field! */
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return copyin(SCARG(uap, buffer), &p->p_thread, sizeof(void *));
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return 0;
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}
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