mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-23 11:18:54 +00:00
3ac4d1ef0c
Fixed everything that depended on getting fcntl.h stuff from the wrong place. Most things don't depend on file.h stuff at all.
1302 lines
32 KiB
C
1302 lines
32 KiB
C
/*
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* Copyright (c) 1982, 1986, 1989, 1991, 1993
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* The Regents of the University of California. All rights reserved.
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* (c) UNIX System Laboratories, Inc.
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* All or some portions of this file are derived from material licensed
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* to the University of California by American Telephone and Telegraph
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* Co. or Unix System Laboratories, Inc. and are reproduced herein with
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* the permission of UNIX System Laboratories, Inc.
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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 University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)kern_sig.c 8.7 (Berkeley) 4/18/94
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* $Id: kern_sig.c,v 1.30 1997/02/22 09:39:11 peter Exp $
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*/
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#include "opt_ktrace.h"
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#define SIGPROP /* include signal properties table */
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#include <sys/param.h>
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#include <sys/sysproto.h>
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#include <sys/signalvar.h>
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#include <sys/resourcevar.h>
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#include <sys/namei.h>
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#include <sys/vnode.h>
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#include <sys/proc.h>
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#include <sys/systm.h>
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#include <sys/timeb.h>
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#include <sys/times.h>
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#include <sys/buf.h>
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#include <sys/acct.h>
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#include <sys/fcntl.h>
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#include <sys/kernel.h>
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#include <sys/wait.h>
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#include <sys/ktrace.h>
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#include <sys/syslog.h>
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#include <sys/stat.h>
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#include <sys/sysent.h>
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#include <machine/cpu.h>
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#include <vm/vm.h>
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#include <vm/vm_param.h>
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#include <vm/vm_prot.h>
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#include <sys/lock.h>
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#include <vm/pmap.h>
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#include <vm/vm_map.h>
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#include <sys/user.h> /* for coredump */
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static int coredump __P((struct proc *p));
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static int killpg1 __P((struct proc *cp, int signum, int pgid, int all));
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static void stop __P((struct proc *));
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/*
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* Can process p, with pcred pc, send the signal signum to process q?
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*/
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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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#ifndef _SYS_SYSPROTO_H_
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struct sigaction_args {
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int signum;
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struct sigaction *nsa;
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struct sigaction *osa;
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};
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#endif
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/* ARGSUSED */
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int
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sigaction(p, uap, retval)
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struct proc *p;
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register struct sigaction_args *uap;
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int *retval;
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{
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struct sigaction vec;
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register struct sigaction *sa;
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register struct sigacts *ps = p->p_sigacts;
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register int signum;
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int bit, error;
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signum = uap->signum;
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if (signum <= 0 || signum >= NSIG)
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return (EINVAL);
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sa = &vec;
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if (uap->osa) {
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sa->sa_handler = ps->ps_sigact[signum];
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sa->sa_mask = ps->ps_catchmask[signum];
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bit = sigmask(signum);
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sa->sa_flags = 0;
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if ((ps->ps_sigonstack & bit) != 0)
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sa->sa_flags |= SA_ONSTACK;
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if ((ps->ps_sigintr & bit) == 0)
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sa->sa_flags |= SA_RESTART;
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if ((ps->ps_sigreset & bit) != 0)
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sa->sa_flags |= SA_RESETHAND;
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if ((ps->ps_signodefer & bit) != 0)
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sa->sa_flags |= SA_NODEFER;
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if (signum == SIGCHLD && p->p_flag & P_NOCLDSTOP)
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sa->sa_flags |= SA_NOCLDSTOP;
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if ((error = copyout((caddr_t)sa, (caddr_t)uap->osa,
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sizeof (vec))))
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return (error);
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}
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if (uap->nsa) {
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if ((error = copyin((caddr_t)uap->nsa, (caddr_t)sa,
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sizeof (vec))))
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return (error);
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if ((signum == SIGKILL || signum == SIGSTOP) &&
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sa->sa_handler != SIG_DFL)
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return (EINVAL);
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setsigvec(p, signum, sa);
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}
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return (0);
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}
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void
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setsigvec(p, signum, sa)
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register struct proc *p;
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int signum;
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register struct sigaction *sa;
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{
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register struct sigacts *ps = p->p_sigacts;
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register int bit;
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bit = sigmask(signum);
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/*
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* Change setting atomically.
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*/
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(void) splhigh();
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ps->ps_sigact[signum] = sa->sa_handler;
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ps->ps_catchmask[signum] = sa->sa_mask &~ sigcantmask;
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if ((sa->sa_flags & SA_RESTART) == 0)
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ps->ps_sigintr |= bit;
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else
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ps->ps_sigintr &= ~bit;
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if (sa->sa_flags & SA_ONSTACK)
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ps->ps_sigonstack |= bit;
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else
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ps->ps_sigonstack &= ~bit;
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if (sa->sa_flags & SA_RESETHAND)
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ps->ps_sigreset |= bit;
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else
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ps->ps_sigreset &= ~bit;
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if (sa->sa_flags & SA_NODEFER)
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ps->ps_signodefer |= bit;
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else
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ps->ps_signodefer &= ~bit;
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#ifdef COMPAT_SUNOS
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if (sa->sa_flags & SA_USERTRAMP)
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ps->ps_usertramp |= bit;
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else
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ps->ps_usertramp &= ~bit;
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#endif
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if (signum == SIGCHLD) {
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if (sa->sa_flags & SA_NOCLDSTOP)
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p->p_flag |= P_NOCLDSTOP;
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else
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p->p_flag &= ~P_NOCLDSTOP;
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}
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/*
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* Set bit in p_sigignore for signals that are set to SIG_IGN,
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* and for signals set to SIG_DFL where the default is to ignore.
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* However, don't put SIGCONT in p_sigignore,
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* as we have to restart the process.
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*/
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if (sa->sa_handler == SIG_IGN ||
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(sigprop[signum] & SA_IGNORE && sa->sa_handler == SIG_DFL)) {
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p->p_siglist &= ~bit; /* never to be seen again */
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if (signum != SIGCONT)
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p->p_sigignore |= bit; /* easier in psignal */
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p->p_sigcatch &= ~bit;
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} else {
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p->p_sigignore &= ~bit;
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if (sa->sa_handler == SIG_DFL)
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p->p_sigcatch &= ~bit;
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else
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p->p_sigcatch |= bit;
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}
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(void) spl0();
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}
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/*
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* Initialize signal state for process 0;
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* set to ignore signals that are ignored by default.
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*/
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void
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siginit(p)
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struct proc *p;
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{
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register int i;
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for (i = 0; i < NSIG; i++)
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if (sigprop[i] & SA_IGNORE && i != SIGCONT)
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p->p_sigignore |= sigmask(i);
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}
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/*
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* Reset signals for an exec of the specified process.
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*/
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void
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execsigs(p)
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register struct proc *p;
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{
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register struct sigacts *ps = p->p_sigacts;
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register int nc, mask;
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/*
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* Reset caught signals. Held signals remain held
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* through p_sigmask (unless they were caught,
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* and are now ignored by default).
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*/
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while (p->p_sigcatch) {
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nc = ffs((long)p->p_sigcatch);
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mask = sigmask(nc);
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p->p_sigcatch &= ~mask;
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if (sigprop[nc] & SA_IGNORE) {
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if (nc != SIGCONT)
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p->p_sigignore |= mask;
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p->p_siglist &= ~mask;
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}
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ps->ps_sigact[nc] = SIG_DFL;
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}
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/*
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* Reset stack state to the user stack.
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* Clear set of signals caught on the signal stack.
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*/
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ps->ps_sigstk.ss_flags = SS_DISABLE;
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ps->ps_sigstk.ss_size = 0;
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ps->ps_sigstk.ss_sp = 0;
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ps->ps_flags = 0;
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}
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/*
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* Manipulate signal mask.
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* Note that we receive new mask, not pointer,
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* and return old mask as return value;
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* the library stub does the rest.
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*/
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#ifndef _SYS_SYSPROTO_H_
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struct sigprocmask_args {
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int how;
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sigset_t mask;
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};
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#endif
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int
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sigprocmask(p, uap, retval)
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register struct proc *p;
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struct sigprocmask_args *uap;
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int *retval;
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{
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int error = 0;
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*retval = p->p_sigmask;
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(void) splhigh();
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switch (uap->how) {
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case SIG_BLOCK:
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p->p_sigmask |= uap->mask &~ sigcantmask;
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break;
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case SIG_UNBLOCK:
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p->p_sigmask &= ~uap->mask;
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break;
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case SIG_SETMASK:
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p->p_sigmask = uap->mask &~ sigcantmask;
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break;
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default:
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error = EINVAL;
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break;
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}
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(void) spl0();
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return (error);
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}
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#ifndef _SYS_SYSPROTO_H_
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struct sigpending_args {
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int dummy;
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};
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#endif
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/* ARGSUSED */
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int
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sigpending(p, uap, retval)
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struct proc *p;
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struct sigpending_args *uap;
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int *retval;
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{
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*retval = p->p_siglist;
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return (0);
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}
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#if defined(COMPAT_43) || defined(COMPAT_SUNOS)
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/*
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* Generalized interface signal handler, 4.3-compatible.
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*/
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#ifndef _SYS_SYSPROTO_H_
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struct osigvec_args {
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int signum;
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struct sigvec *nsv;
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struct sigvec *osv;
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};
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#endif
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/* ARGSUSED */
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int
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osigvec(p, uap, retval)
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struct proc *p;
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register struct osigvec_args *uap;
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int *retval;
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{
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struct sigvec vec;
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register struct sigacts *ps = p->p_sigacts;
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register struct sigvec *sv;
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register int signum;
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int bit, error;
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signum = uap->signum;
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if (signum <= 0 || signum >= NSIG)
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return (EINVAL);
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sv = &vec;
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if (uap->osv) {
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*(sig_t *)&sv->sv_handler = ps->ps_sigact[signum];
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sv->sv_mask = ps->ps_catchmask[signum];
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bit = sigmask(signum);
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sv->sv_flags = 0;
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if ((ps->ps_sigonstack & bit) != 0)
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sv->sv_flags |= SV_ONSTACK;
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if ((ps->ps_sigintr & bit) != 0)
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sv->sv_flags |= SV_INTERRUPT;
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if ((ps->ps_sigreset & bit) != 0)
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sv->sv_flags |= SV_RESETHAND;
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if ((ps->ps_signodefer & bit) != 0)
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sv->sv_flags |= SV_NODEFER;
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#ifndef COMPAT_SUNOS
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if (signum == SIGCHLD && p->p_flag & P_NOCLDSTOP)
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sv->sv_flags |= SV_NOCLDSTOP;
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#endif
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if ((error = copyout((caddr_t)sv, (caddr_t)uap->osv,
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sizeof (vec))))
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return (error);
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}
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if (uap->nsv) {
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if ((error = copyin((caddr_t)uap->nsv, (caddr_t)sv,
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sizeof (vec))))
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return (error);
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if ((signum == SIGKILL || signum == SIGSTOP) &&
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sv->sv_handler != SIG_DFL)
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return (EINVAL);
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#ifdef COMPAT_SUNOS
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sv->sv_flags |= SA_USERTRAMP;
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#endif
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sv->sv_flags ^= SA_RESTART; /* opposite of SV_INTERRUPT */
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setsigvec(p, signum, (struct sigaction *)sv);
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}
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return (0);
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}
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#ifndef _SYS_SYSPROTO_H_
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struct osigblock_args {
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int mask;
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};
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#endif
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int
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osigblock(p, uap, retval)
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register struct proc *p;
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struct osigblock_args *uap;
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int *retval;
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{
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(void) splhigh();
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*retval = p->p_sigmask;
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p->p_sigmask |= uap->mask &~ sigcantmask;
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(void) spl0();
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return (0);
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}
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#ifndef _SYS_SYSPROTO_H_
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struct osigsetmask_args {
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int mask;
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};
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#endif
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int
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osigsetmask(p, uap, retval)
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struct proc *p;
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struct osigsetmask_args *uap;
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int *retval;
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{
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(void) splhigh();
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*retval = p->p_sigmask;
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p->p_sigmask = uap->mask &~ sigcantmask;
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(void) spl0();
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return (0);
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}
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#endif /* COMPAT_43 || COMPAT_SUNOS */
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|
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/*
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* Suspend process until signal, providing mask to be set
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* in the meantime. Note nonstandard calling convention:
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* libc stub passes mask, not pointer, to save a copyin.
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*/
|
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#ifndef _SYS_SYSPROTO_H_
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struct sigsuspend_args {
|
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sigset_t mask;
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};
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#endif
|
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/* ARGSUSED */
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int
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sigsuspend(p, uap, retval)
|
|
register struct proc *p;
|
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struct sigsuspend_args *uap;
|
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int *retval;
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{
|
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register struct sigacts *ps = p->p_sigacts;
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|
|
|
/*
|
|
* When returning from sigpause, we want
|
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* the old mask to be restored after the
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* signal handler has finished. Thus, we
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* save it here and mark the sigacts structure
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|
* to indicate this.
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*/
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ps->ps_oldmask = p->p_sigmask;
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ps->ps_flags |= SAS_OLDMASK;
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p->p_sigmask = uap->mask &~ sigcantmask;
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while (tsleep((caddr_t) ps, PPAUSE|PCATCH, "pause", 0) == 0)
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/* void */;
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/* always return EINTR rather than ERESTART... */
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return (EINTR);
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}
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|
|
#if defined(COMPAT_43) || defined(COMPAT_SUNOS)
|
|
#ifndef _SYS_SYSPROTO_H_
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|
struct osigstack_args {
|
|
struct sigstack *nss;
|
|
struct sigstack *oss;
|
|
};
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|
#endif
|
|
/* ARGSUSED */
|
|
int
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osigstack(p, uap, retval)
|
|
struct proc *p;
|
|
register struct osigstack_args *uap;
|
|
int *retval;
|
|
{
|
|
struct sigstack ss;
|
|
struct sigacts *psp;
|
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int error = 0;
|
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|
|
psp = p->p_sigacts;
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ss.ss_sp = psp->ps_sigstk.ss_sp;
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ss.ss_onstack = psp->ps_sigstk.ss_flags & SS_ONSTACK;
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if (uap->oss && (error = copyout((caddr_t)&ss, (caddr_t)uap->oss,
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sizeof (struct sigstack))))
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return (error);
|
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if (uap->nss && (error = copyin((caddr_t)uap->nss, (caddr_t)&ss,
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|
sizeof (ss))) == 0) {
|
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psp->ps_sigstk.ss_sp = ss.ss_sp;
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psp->ps_sigstk.ss_size = 0;
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psp->ps_sigstk.ss_flags |= ss.ss_onstack & SS_ONSTACK;
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psp->ps_flags |= SAS_ALTSTACK;
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}
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|
return (error);
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}
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|
#endif /* COMPAT_43 || COMPAT_SUNOS */
|
|
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct sigaltstack_args {
|
|
struct sigaltstack *nss;
|
|
struct sigaltstack *oss;
|
|
};
|
|
#endif
|
|
/* ARGSUSED */
|
|
int
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|
sigaltstack(p, uap, retval)
|
|
struct proc *p;
|
|
register struct sigaltstack_args *uap;
|
|
int *retval;
|
|
{
|
|
struct sigacts *psp;
|
|
struct sigaltstack ss;
|
|
int error;
|
|
|
|
psp = p->p_sigacts;
|
|
if ((psp->ps_flags & SAS_ALTSTACK) == 0)
|
|
psp->ps_sigstk.ss_flags |= SS_DISABLE;
|
|
if (uap->oss && (error = copyout((caddr_t)&psp->ps_sigstk,
|
|
(caddr_t)uap->oss, sizeof (struct sigaltstack))))
|
|
return (error);
|
|
if (uap->nss == 0)
|
|
return (0);
|
|
if ((error = copyin((caddr_t)uap->nss, (caddr_t)&ss, sizeof (ss))))
|
|
return (error);
|
|
if (ss.ss_flags & SS_DISABLE) {
|
|
if (psp->ps_sigstk.ss_flags & SS_ONSTACK)
|
|
return (EINVAL);
|
|
psp->ps_flags &= ~SAS_ALTSTACK;
|
|
psp->ps_sigstk.ss_flags = ss.ss_flags;
|
|
return (0);
|
|
}
|
|
if (ss.ss_size < MINSIGSTKSZ)
|
|
return (ENOMEM);
|
|
psp->ps_flags |= SAS_ALTSTACK;
|
|
psp->ps_sigstk= ss;
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Common code for kill process group/broadcast kill.
|
|
* cp is calling process.
|
|
*/
|
|
int
|
|
killpg1(cp, signum, pgid, all)
|
|
register struct proc *cp;
|
|
int signum, pgid, all;
|
|
{
|
|
register struct proc *p;
|
|
register struct pcred *pc = cp->p_cred;
|
|
struct pgrp *pgrp;
|
|
int nfound = 0;
|
|
|
|
if (all)
|
|
/*
|
|
* broadcast
|
|
*/
|
|
for (p = allproc.lh_first; p != 0; p = p->p_list.le_next) {
|
|
if (p->p_pid <= 1 || p->p_flag & P_SYSTEM ||
|
|
p == cp || !CANSIGNAL(cp, pc, p, signum))
|
|
continue;
|
|
nfound++;
|
|
if (signum)
|
|
psignal(p, signum);
|
|
}
|
|
else {
|
|
if (pgid == 0)
|
|
/*
|
|
* zero pgid means send to my process group.
|
|
*/
|
|
pgrp = cp->p_pgrp;
|
|
else {
|
|
pgrp = pgfind(pgid);
|
|
if (pgrp == NULL)
|
|
return (ESRCH);
|
|
}
|
|
for (p = pgrp->pg_members.lh_first; p != 0;
|
|
p = p->p_pglist.le_next) {
|
|
if (p->p_pid <= 1 || p->p_flag & P_SYSTEM ||
|
|
p->p_stat == SZOMB ||
|
|
!CANSIGNAL(cp, pc, p, signum))
|
|
continue;
|
|
nfound++;
|
|
if (signum)
|
|
psignal(p, signum);
|
|
}
|
|
}
|
|
return (nfound ? 0 : ESRCH);
|
|
}
|
|
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct kill_args {
|
|
int pid;
|
|
int signum;
|
|
};
|
|
#endif
|
|
/* ARGSUSED */
|
|
int
|
|
kill(cp, uap, retval)
|
|
register struct proc *cp;
|
|
register struct kill_args *uap;
|
|
int *retval;
|
|
{
|
|
register struct proc *p;
|
|
register struct pcred *pc = cp->p_cred;
|
|
|
|
if ((u_int)uap->signum >= NSIG)
|
|
return (EINVAL);
|
|
if (uap->pid > 0) {
|
|
/* kill single process */
|
|
if ((p = pfind(uap->pid)) == NULL)
|
|
return (ESRCH);
|
|
if (!CANSIGNAL(cp, pc, p, uap->signum))
|
|
return (EPERM);
|
|
if (uap->signum)
|
|
psignal(p, uap->signum);
|
|
return (0);
|
|
}
|
|
switch (uap->pid) {
|
|
case -1: /* broadcast signal */
|
|
return (killpg1(cp, uap->signum, 0, 1));
|
|
case 0: /* signal own process group */
|
|
return (killpg1(cp, uap->signum, 0, 0));
|
|
default: /* negative explicit process group */
|
|
return (killpg1(cp, uap->signum, -uap->pid, 0));
|
|
}
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
#if defined(COMPAT_43) || defined(COMPAT_SUNOS)
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct okillpg_args {
|
|
int pgid;
|
|
int signum;
|
|
};
|
|
#endif
|
|
/* ARGSUSED */
|
|
int
|
|
okillpg(p, uap, retval)
|
|
struct proc *p;
|
|
register struct okillpg_args *uap;
|
|
int *retval;
|
|
{
|
|
|
|
if ((u_int)uap->signum >= NSIG)
|
|
return (EINVAL);
|
|
return (killpg1(p, uap->signum, uap->pgid, 0));
|
|
}
|
|
#endif /* COMPAT_43 || COMPAT_SUNOS */
|
|
|
|
/*
|
|
* Send a signal to a process group.
|
|
*/
|
|
void
|
|
gsignal(pgid, signum)
|
|
int pgid, signum;
|
|
{
|
|
struct pgrp *pgrp;
|
|
|
|
if (pgid && (pgrp = pgfind(pgid)))
|
|
pgsignal(pgrp, signum, 0);
|
|
}
|
|
|
|
/*
|
|
* Send a signal to a process group. If checktty is 1,
|
|
* limit to members which have a controlling terminal.
|
|
*/
|
|
void
|
|
pgsignal(pgrp, signum, checkctty)
|
|
struct pgrp *pgrp;
|
|
int signum, checkctty;
|
|
{
|
|
register struct proc *p;
|
|
|
|
if (pgrp)
|
|
for (p = pgrp->pg_members.lh_first; p != 0;
|
|
p = p->p_pglist.le_next)
|
|
if (checkctty == 0 || p->p_flag & P_CONTROLT)
|
|
psignal(p, signum);
|
|
}
|
|
|
|
/*
|
|
* Send a signal caused by a trap to the current process.
|
|
* If it will be caught immediately, deliver it with correct code.
|
|
* Otherwise, post it normally.
|
|
*/
|
|
void
|
|
trapsignal(p, signum, code)
|
|
struct proc *p;
|
|
register int signum;
|
|
u_long code;
|
|
{
|
|
register struct sigacts *ps = p->p_sigacts;
|
|
int mask;
|
|
|
|
mask = sigmask(signum);
|
|
if ((p->p_flag & P_TRACED) == 0 && (p->p_sigcatch & mask) != 0 &&
|
|
(p->p_sigmask & mask) == 0) {
|
|
p->p_stats->p_ru.ru_nsignals++;
|
|
#ifdef KTRACE
|
|
if (KTRPOINT(p, KTR_PSIG))
|
|
ktrpsig(p->p_tracep, signum, ps->ps_sigact[signum],
|
|
p->p_sigmask, code);
|
|
#endif
|
|
(*p->p_sysent->sv_sendsig)(ps->ps_sigact[signum], signum,
|
|
p->p_sigmask, code);
|
|
p->p_sigmask |= ps->ps_catchmask[signum] |
|
|
(mask & ~ps->ps_signodefer);
|
|
if ((ps->ps_sigreset & mask) != 0) {
|
|
/*
|
|
* See setsigvec() for origin of this code.
|
|
*/
|
|
p->p_sigcatch &= ~mask;
|
|
if (signum != SIGCONT && sigprop[signum] & SA_IGNORE)
|
|
p->p_sigignore |= mask;
|
|
ps->ps_sigact[signum] = SIG_DFL;
|
|
}
|
|
} else {
|
|
ps->ps_code = code; /* XXX for core dump/debugger */
|
|
ps->ps_sig = signum; /* XXX to verify code */
|
|
psignal(p, signum);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Send the signal to the process. If the signal has an action, the action
|
|
* is usually performed by the target process rather than the caller; we add
|
|
* the signal to the set of pending signals for the process.
|
|
*
|
|
* Exceptions:
|
|
* o When a stop signal is sent to a sleeping process that takes the
|
|
* default action, the process is stopped without awakening it.
|
|
* o SIGCONT restarts stopped processes (or puts them back to sleep)
|
|
* regardless of the signal action (eg, blocked or ignored).
|
|
*
|
|
* Other ignored signals are discarded immediately.
|
|
*/
|
|
void
|
|
psignal(p, signum)
|
|
register struct proc *p;
|
|
register int signum;
|
|
{
|
|
register int s, prop;
|
|
register sig_t action;
|
|
int mask;
|
|
|
|
if ((u_int)signum >= NSIG || signum == 0)
|
|
panic("psignal signal number");
|
|
mask = sigmask(signum);
|
|
prop = sigprop[signum];
|
|
|
|
/*
|
|
* If proc is traced, always give parent a chance.
|
|
*/
|
|
if (p->p_flag & P_TRACED)
|
|
action = SIG_DFL;
|
|
else {
|
|
/*
|
|
* If the signal is being ignored,
|
|
* then we forget about it immediately.
|
|
* (Note: we don't set SIGCONT in p_sigignore,
|
|
* and if it is set to SIG_IGN,
|
|
* action will be SIG_DFL here.)
|
|
*/
|
|
if (p->p_sigignore & mask)
|
|
return;
|
|
if (p->p_sigmask & mask)
|
|
action = SIG_HOLD;
|
|
else if (p->p_sigcatch & mask)
|
|
action = SIG_CATCH;
|
|
else
|
|
action = SIG_DFL;
|
|
}
|
|
|
|
if (p->p_nice > NZERO && action == SIG_DFL && (prop & SA_KILL) &&
|
|
(p->p_flag & P_TRACED) == 0)
|
|
p->p_nice = NZERO;
|
|
|
|
if (prop & SA_CONT)
|
|
p->p_siglist &= ~stopsigmask;
|
|
|
|
if (prop & SA_STOP) {
|
|
/*
|
|
* If sending a tty stop signal to a member of an orphaned
|
|
* process group, discard the signal here if the action
|
|
* is default; don't stop the process below if sleeping,
|
|
* and don't clear any pending SIGCONT.
|
|
*/
|
|
if (prop & SA_TTYSTOP && p->p_pgrp->pg_jobc == 0 &&
|
|
action == SIG_DFL)
|
|
return;
|
|
p->p_siglist &= ~contsigmask;
|
|
}
|
|
p->p_siglist |= mask;
|
|
|
|
/*
|
|
* Defer further processing for signals which are held,
|
|
* except that stopped processes must be continued by SIGCONT.
|
|
*/
|
|
if (action == SIG_HOLD && ((prop & SA_CONT) == 0 || p->p_stat != SSTOP))
|
|
return;
|
|
s = splhigh();
|
|
switch (p->p_stat) {
|
|
|
|
case SSLEEP:
|
|
/*
|
|
* If process is sleeping uninterruptibly
|
|
* we can't interrupt the sleep... the signal will
|
|
* be noticed when the process returns through
|
|
* trap() or syscall().
|
|
*/
|
|
if ((p->p_flag & P_SINTR) == 0)
|
|
goto out;
|
|
/*
|
|
* Process is sleeping and traced... make it runnable
|
|
* so it can discover the signal in issignal() and stop
|
|
* for the parent.
|
|
*/
|
|
if (p->p_flag & P_TRACED)
|
|
goto run;
|
|
/*
|
|
* If SIGCONT is default (or ignored) and process is
|
|
* asleep, we are finished; the process should not
|
|
* be awakened.
|
|
*/
|
|
if ((prop & SA_CONT) && action == SIG_DFL) {
|
|
p->p_siglist &= ~mask;
|
|
goto out;
|
|
}
|
|
/*
|
|
* When a sleeping process receives a stop
|
|
* signal, process immediately if possible.
|
|
* All other (caught or default) signals
|
|
* cause the process to run.
|
|
*/
|
|
if (prop & SA_STOP) {
|
|
if (action != SIG_DFL)
|
|
goto runfast;
|
|
/*
|
|
* If a child holding parent blocked,
|
|
* stopping could cause deadlock.
|
|
*/
|
|
if (p->p_flag & P_PPWAIT)
|
|
goto out;
|
|
p->p_siglist &= ~mask;
|
|
p->p_xstat = signum;
|
|
if ((p->p_pptr->p_flag & P_NOCLDSTOP) == 0)
|
|
psignal(p->p_pptr, SIGCHLD);
|
|
stop(p);
|
|
goto out;
|
|
} else
|
|
goto runfast;
|
|
/*NOTREACHED*/
|
|
|
|
case SSTOP:
|
|
/*
|
|
* If traced process is already stopped,
|
|
* then no further action is necessary.
|
|
*/
|
|
if (p->p_flag & P_TRACED)
|
|
goto out;
|
|
|
|
/*
|
|
* Kill signal always sets processes running.
|
|
*/
|
|
if (signum == SIGKILL)
|
|
goto runfast;
|
|
|
|
if (prop & SA_CONT) {
|
|
/*
|
|
* If SIGCONT is default (or ignored), we continue the
|
|
* process but don't leave the signal in p_siglist, as
|
|
* it has no further action. If SIGCONT is held, we
|
|
* continue the process and leave the signal in
|
|
* p_siglist. If the process catches SIGCONT, let it
|
|
* handle the signal itself. If it isn't waiting on
|
|
* an event, then it goes back to run state.
|
|
* Otherwise, process goes back to sleep state.
|
|
*/
|
|
if (action == SIG_DFL)
|
|
p->p_siglist &= ~mask;
|
|
if (action == SIG_CATCH)
|
|
goto runfast;
|
|
if (p->p_wchan == 0)
|
|
goto run;
|
|
p->p_stat = SSLEEP;
|
|
goto out;
|
|
}
|
|
|
|
if (prop & SA_STOP) {
|
|
/*
|
|
* Already stopped, don't need to stop again.
|
|
* (If we did the shell could get confused.)
|
|
*/
|
|
p->p_siglist &= ~mask; /* take it away */
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* If process is sleeping interruptibly, then simulate a
|
|
* wakeup so that when it is continued, it will be made
|
|
* runnable and can look at the signal. But don't make
|
|
* the process runnable, leave it stopped.
|
|
*/
|
|
if (p->p_wchan && p->p_flag & P_SINTR)
|
|
unsleep(p);
|
|
goto out;
|
|
|
|
default:
|
|
/*
|
|
* SRUN, SIDL, SZOMB do nothing with the signal,
|
|
* other than kicking ourselves if we are running.
|
|
* It will either never be noticed, or noticed very soon.
|
|
*/
|
|
if (p == curproc)
|
|
signotify(p);
|
|
goto out;
|
|
}
|
|
/*NOTREACHED*/
|
|
|
|
runfast:
|
|
/*
|
|
* Raise priority to at least PUSER.
|
|
*/
|
|
if (p->p_priority > PUSER)
|
|
p->p_priority = PUSER;
|
|
run:
|
|
setrunnable(p);
|
|
out:
|
|
splx(s);
|
|
}
|
|
|
|
/*
|
|
* If the current process has received a signal (should be caught or cause
|
|
* termination, should interrupt current syscall), return the signal number.
|
|
* Stop signals with default action are processed immediately, then cleared;
|
|
* they aren't returned. This is checked after each entry to the system for
|
|
* a syscall or trap (though this can usually be done without calling issignal
|
|
* by checking the pending signal masks in the CURSIG macro.) The normal call
|
|
* sequence is
|
|
*
|
|
* while (signum = CURSIG(curproc))
|
|
* postsig(signum);
|
|
*/
|
|
int
|
|
issignal(p)
|
|
register struct proc *p;
|
|
{
|
|
register int signum, mask, prop;
|
|
|
|
for (;;) {
|
|
mask = p->p_siglist & ~p->p_sigmask;
|
|
if (p->p_flag & P_PPWAIT)
|
|
mask &= ~stopsigmask;
|
|
if (mask == 0) /* no signal to send */
|
|
return (0);
|
|
signum = ffs((long)mask);
|
|
mask = sigmask(signum);
|
|
prop = sigprop[signum];
|
|
/*
|
|
* We should see pending but ignored signals
|
|
* only if P_TRACED was on when they were posted.
|
|
*/
|
|
if (mask & p->p_sigignore && (p->p_flag & P_TRACED) == 0) {
|
|
p->p_siglist &= ~mask;
|
|
continue;
|
|
}
|
|
if (p->p_flag & P_TRACED && (p->p_flag & P_PPWAIT) == 0) {
|
|
/*
|
|
* If traced, always stop, and stay
|
|
* stopped until released by the parent.
|
|
*/
|
|
p->p_xstat = signum;
|
|
psignal(p->p_pptr, SIGCHLD);
|
|
do {
|
|
stop(p);
|
|
mi_switch();
|
|
} while (!trace_req(p) && p->p_flag & P_TRACED);
|
|
|
|
/*
|
|
* If the traced bit got turned off, go back up
|
|
* to the top to rescan signals. This ensures
|
|
* that p_sig* and ps_sigact are consistent.
|
|
*/
|
|
if ((p->p_flag & P_TRACED) == 0)
|
|
continue;
|
|
|
|
/*
|
|
* If parent wants us to take the signal,
|
|
* then it will leave it in p->p_xstat;
|
|
* otherwise we just look for signals again.
|
|
*/
|
|
p->p_siglist &= ~mask; /* clear the old signal */
|
|
signum = p->p_xstat;
|
|
if (signum == 0)
|
|
continue;
|
|
|
|
/*
|
|
* Put the new signal into p_siglist. If the
|
|
* signal is being masked, look for other signals.
|
|
*/
|
|
mask = sigmask(signum);
|
|
p->p_siglist |= mask;
|
|
if (p->p_sigmask & mask)
|
|
continue;
|
|
}
|
|
|
|
/*
|
|
* Decide whether the signal should be returned.
|
|
* Return the signal's number, or fall through
|
|
* to clear it from the pending mask.
|
|
*/
|
|
switch ((int)p->p_sigacts->ps_sigact[signum]) {
|
|
|
|
case (int)SIG_DFL:
|
|
/*
|
|
* Don't take default actions on system processes.
|
|
*/
|
|
if (p->p_pid <= 1) {
|
|
#ifdef DIAGNOSTIC
|
|
/*
|
|
* Are you sure you want to ignore SIGSEGV
|
|
* in init? XXX
|
|
*/
|
|
printf("Process (pid %lu) got signal %d\n",
|
|
(u_long)p->p_pid, signum);
|
|
#endif
|
|
break; /* == ignore */
|
|
}
|
|
/*
|
|
* If there is a pending stop signal to process
|
|
* with default action, stop here,
|
|
* then clear the signal. However,
|
|
* if process is member of an orphaned
|
|
* process group, ignore tty stop signals.
|
|
*/
|
|
if (prop & SA_STOP) {
|
|
if (p->p_flag & P_TRACED ||
|
|
(p->p_pgrp->pg_jobc == 0 &&
|
|
prop & SA_TTYSTOP))
|
|
break; /* == ignore */
|
|
p->p_xstat = signum;
|
|
stop(p);
|
|
if ((p->p_pptr->p_flag & P_NOCLDSTOP) == 0)
|
|
psignal(p->p_pptr, SIGCHLD);
|
|
mi_switch();
|
|
break;
|
|
} else if (prop & SA_IGNORE) {
|
|
/*
|
|
* Except for SIGCONT, shouldn't get here.
|
|
* Default action is to ignore; drop it.
|
|
*/
|
|
break; /* == ignore */
|
|
} else
|
|
return (signum);
|
|
/*NOTREACHED*/
|
|
|
|
case (int)SIG_IGN:
|
|
/*
|
|
* Masking above should prevent us ever trying
|
|
* to take action on an ignored signal other
|
|
* than SIGCONT, unless process is traced.
|
|
*/
|
|
if ((prop & SA_CONT) == 0 &&
|
|
(p->p_flag & P_TRACED) == 0)
|
|
printf("issignal\n");
|
|
break; /* == ignore */
|
|
|
|
default:
|
|
/*
|
|
* This signal has an action, let
|
|
* postsig() process it.
|
|
*/
|
|
return (signum);
|
|
}
|
|
p->p_siglist &= ~mask; /* take the signal! */
|
|
}
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
/*
|
|
* Put the argument process into the stopped state and notify the parent
|
|
* via wakeup. Signals are handled elsewhere. The process must not be
|
|
* on the run queue.
|
|
*/
|
|
void
|
|
stop(p)
|
|
register struct proc *p;
|
|
{
|
|
|
|
p->p_stat = SSTOP;
|
|
p->p_flag &= ~P_WAITED;
|
|
wakeup((caddr_t)p->p_pptr);
|
|
}
|
|
|
|
/*
|
|
* Take the action for the specified signal
|
|
* from the current set of pending signals.
|
|
*/
|
|
void
|
|
postsig(signum)
|
|
register int signum;
|
|
{
|
|
register struct proc *p = curproc;
|
|
register struct sigacts *ps = p->p_sigacts;
|
|
register sig_t action;
|
|
int code, mask, returnmask;
|
|
|
|
#ifdef DIAGNOSTIC
|
|
if (signum == 0)
|
|
panic("postsig");
|
|
#endif
|
|
mask = sigmask(signum);
|
|
p->p_siglist &= ~mask;
|
|
action = ps->ps_sigact[signum];
|
|
#ifdef KTRACE
|
|
if (KTRPOINT(p, KTR_PSIG))
|
|
ktrpsig(p->p_tracep,
|
|
signum, action, ps->ps_flags & SAS_OLDMASK ?
|
|
ps->ps_oldmask : p->p_sigmask, 0);
|
|
#endif
|
|
if (action == SIG_DFL) {
|
|
/*
|
|
* Default action, where the default is to kill
|
|
* the process. (Other cases were ignored above.)
|
|
*/
|
|
sigexit(p, signum);
|
|
/* NOTREACHED */
|
|
} else {
|
|
/*
|
|
* If we get here, the signal must be caught.
|
|
*/
|
|
#ifdef DIAGNOSTIC
|
|
if (action == SIG_IGN || (p->p_sigmask & mask))
|
|
panic("postsig action");
|
|
#endif
|
|
/*
|
|
* Set the new mask value and also defer further
|
|
* occurences of this signal.
|
|
*
|
|
* Special case: user has done a sigpause. Here the
|
|
* current mask is not of interest, but rather the
|
|
* mask from before the sigpause is what we want
|
|
* restored after the signal processing is completed.
|
|
*/
|
|
(void) splhigh();
|
|
if (ps->ps_flags & SAS_OLDMASK) {
|
|
returnmask = ps->ps_oldmask;
|
|
ps->ps_flags &= ~SAS_OLDMASK;
|
|
} else
|
|
returnmask = p->p_sigmask;
|
|
p->p_sigmask |= ps->ps_catchmask[signum] |
|
|
(mask & ~ps->ps_signodefer);
|
|
if ((ps->ps_sigreset & mask) != 0) {
|
|
/*
|
|
* See setsigvec() for origin of this code.
|
|
*/
|
|
p->p_sigcatch &= ~mask;
|
|
if (signum != SIGCONT && sigprop[signum] & SA_IGNORE)
|
|
p->p_sigignore |= mask;
|
|
ps->ps_sigact[signum] = SIG_DFL;
|
|
}
|
|
(void) spl0();
|
|
p->p_stats->p_ru.ru_nsignals++;
|
|
if (ps->ps_sig != signum) {
|
|
code = 0;
|
|
} else {
|
|
code = ps->ps_code;
|
|
ps->ps_code = 0;
|
|
ps->ps_sig = 0;
|
|
}
|
|
(*p->p_sysent->sv_sendsig)(action, signum, returnmask, code);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Kill the current process for stated reason.
|
|
*/
|
|
void
|
|
killproc(p, why)
|
|
struct proc *p;
|
|
char *why;
|
|
{
|
|
log(LOG_ERR, "pid %d (%s), uid %d, was killed: %s\n", p->p_pid, p->p_comm,
|
|
p->p_cred && p->p_ucred ? p->p_ucred->cr_uid : -1, why);
|
|
psignal(p, SIGKILL);
|
|
}
|
|
|
|
/*
|
|
* Force the current process to exit with the specified signal, dumping core
|
|
* if appropriate. We bypass the normal tests for masked and caught signals,
|
|
* allowing unrecoverable failures to terminate the process without changing
|
|
* signal state. Mark the accounting record with the signal termination.
|
|
* If dumping core, save the signal number for the debugger. Calls exit and
|
|
* does not return.
|
|
*/
|
|
void
|
|
sigexit(p, signum)
|
|
register struct proc *p;
|
|
int signum;
|
|
{
|
|
|
|
p->p_acflag |= AXSIG;
|
|
if (sigprop[signum] & SA_CORE) {
|
|
p->p_sigacts->ps_sig = signum;
|
|
/*
|
|
* Log signals which would cause core dumps
|
|
* (Log as LOG_INFO to appease those who don't want
|
|
* these messages.)
|
|
* XXX : Todo, as well as euid, write out ruid too
|
|
*/
|
|
if (coredump(p) == 0)
|
|
signum |= WCOREFLAG;
|
|
log(LOG_INFO, "pid %d (%s), uid %d: exited on signal %d%s\n",
|
|
p->p_pid, p->p_comm,
|
|
p->p_cred && p->p_ucred ? p->p_ucred->cr_uid : -1,
|
|
signum &~ WCOREFLAG,
|
|
signum & WCOREFLAG ? " (core dumped)" : "");
|
|
}
|
|
exit1(p, W_EXITCODE(0, signum));
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
/*
|
|
* Dump core, into a file named "progname.core", unless the process was
|
|
* setuid/setgid.
|
|
*/
|
|
static int
|
|
coredump(p)
|
|
register struct proc *p;
|
|
{
|
|
register struct vnode *vp;
|
|
register struct ucred *cred = p->p_cred->pc_ucred;
|
|
register struct vmspace *vm = p->p_vmspace;
|
|
struct nameidata nd;
|
|
struct vattr vattr;
|
|
int error, error1;
|
|
char name[MAXCOMLEN+6]; /* progname.core */
|
|
|
|
if (p->p_flag & P_SUGID)
|
|
return (EFAULT);
|
|
if (ctob(UPAGES + vm->vm_dsize + vm->vm_ssize) >=
|
|
p->p_rlimit[RLIMIT_CORE].rlim_cur)
|
|
return (EFAULT);
|
|
sprintf(name, "%s.core", p->p_comm);
|
|
NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, name, p);
|
|
if ((error = vn_open(&nd,
|
|
O_CREAT | FWRITE, S_IRUSR | S_IWUSR)))
|
|
return (error);
|
|
vp = nd.ni_vp;
|
|
|
|
/* Don't dump to non-regular files or files with links. */
|
|
if (vp->v_type != VREG ||
|
|
VOP_GETATTR(vp, &vattr, cred, p) || vattr.va_nlink != 1) {
|
|
error = EFAULT;
|
|
goto out;
|
|
}
|
|
VATTR_NULL(&vattr);
|
|
vattr.va_size = 0;
|
|
VOP_LEASE(vp, p, cred, LEASE_WRITE);
|
|
VOP_SETATTR(vp, &vattr, cred, p);
|
|
p->p_acflag |= ACORE;
|
|
bcopy(p, &p->p_addr->u_kproc.kp_proc, sizeof(struct proc));
|
|
fill_eproc(p, &p->p_addr->u_kproc.kp_eproc);
|
|
error = cpu_coredump(p, vp, cred);
|
|
if (error == 0)
|
|
error = vn_rdwr(UIO_WRITE, vp, vm->vm_daddr,
|
|
(int)ctob(vm->vm_dsize), (off_t)ctob(UPAGES), UIO_USERSPACE,
|
|
IO_NODELOCKED|IO_UNIT, cred, (int *) NULL, p);
|
|
if (error == 0)
|
|
error = vn_rdwr(UIO_WRITE, vp,
|
|
(caddr_t) trunc_page(USRSTACK - ctob(vm->vm_ssize)),
|
|
round_page(ctob(vm->vm_ssize)),
|
|
(off_t)ctob(UPAGES) + ctob(vm->vm_dsize), UIO_USERSPACE,
|
|
IO_NODELOCKED|IO_UNIT, cred, (int *) NULL, p);
|
|
out:
|
|
VOP_UNLOCK(vp, 0, p);
|
|
error1 = vn_close(vp, FWRITE, cred, p);
|
|
if (error == 0)
|
|
error = error1;
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Nonexistent system call-- signal process (may want to handle it).
|
|
* Flag error in case process won't see signal immediately (blocked or ignored).
|
|
*/
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct nosys_args {
|
|
int dummy;
|
|
};
|
|
#endif
|
|
/* ARGSUSED */
|
|
int
|
|
nosys(p, args, retval)
|
|
struct proc *p;
|
|
struct nosys_args *args;
|
|
int *retval;
|
|
{
|
|
|
|
psignal(p, SIGSYS);
|
|
return (EINVAL);
|
|
}
|