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-rw-r--r--sys/kern/kern_sig.c1740
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diff --git a/sys/kern/kern_sig.c b/sys/kern/kern_sig.c
new file mode 100644
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--- /dev/null
+++ b/sys/kern/kern_sig.c
@@ -0,0 +1,1740 @@
+/*
+ * Copyright (c) 1982, 1986, 1989, 1991, 1993
+ * The Regents of the University of California. All rights reserved.
+ * (c) UNIX System Laboratories, Inc.
+ * All or some portions of this file are derived from material licensed
+ * to the University of California by American Telephone and Telegraph
+ * Co. or Unix System Laboratories, Inc. and are reproduced herein with
+ * the permission of UNIX System Laboratories, Inc.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * @(#)kern_sig.c 8.7 (Berkeley) 4/18/94
+ * $FreeBSD$
+ */
+
+#include "opt_compat.h"
+#include "opt_ktrace.h"
+
+#include <sys/param.h>
+#include <sys/kernel.h>
+#include <sys/sysproto.h>
+#include <sys/signalvar.h>
+#include <sys/resourcevar.h>
+#include <sys/namei.h>
+#include <sys/vnode.h>
+#include <sys/event.h>
+#include <sys/proc.h>
+#include <sys/pioctl.h>
+#include <sys/systm.h>
+#include <sys/acct.h>
+#include <sys/fcntl.h>
+#include <sys/wait.h>
+#include <sys/ktrace.h>
+#include <sys/syslog.h>
+#include <sys/stat.h>
+#include <sys/sysent.h>
+#include <sys/sysctl.h>
+#include <sys/malloc.h>
+
+
+#include <machine/ipl.h>
+#include <machine/cpu.h>
+#include <machine/smp.h>
+
+#define ONSIG 32 /* NSIG for osig* syscalls. XXX. */
+
+static int coredump __P((struct proc *));
+static int do_sigaction __P((struct proc *p, int sig, struct sigaction *act,
+ struct sigaction *oact, int old));
+static int do_sigprocmask __P((struct proc *p, int how, sigset_t *set,
+ sigset_t *oset, int old));
+static char *expand_name __P((const char *, uid_t, pid_t));
+static int killpg1 __P((struct proc *cp, int sig, int pgid, int all));
+static int sig_ffs __P((sigset_t *set));
+static int sigprop __P((int sig));
+static void stop __P((struct proc *));
+
+static int filt_sigattach(struct knote *kn);
+static void filt_sigdetach(struct knote *kn);
+static int filt_signal(struct knote *kn, long hint);
+
+struct filterops sig_filtops =
+ { 0, filt_sigattach, filt_sigdetach, filt_signal };
+
+static int kern_logsigexit = 1;
+SYSCTL_INT(_kern, KERN_LOGSIGEXIT, logsigexit, CTLFLAG_RW,
+ &kern_logsigexit, 0,
+ "Log processes quitting on abnormal signals to syslog(3)");
+
+/*
+ * Can process p, with pcred pc, send the signal sig to process q?
+ */
+#define CANSIGNAL(p, q, sig) \
+ (!p_trespass(p, q) || \
+ ((sig) == SIGCONT && (q)->p_session == (p)->p_session))
+
+/*
+ * Policy -- Can real uid ruid with ucred uc send a signal to process q?
+ */
+#define CANSIGIO(ruid, uc, q) \
+ ((uc)->cr_uid == 0 || \
+ (ruid) == (q)->p_cred->p_ruid || \
+ (uc)->cr_uid == (q)->p_cred->p_ruid || \
+ (ruid) == (q)->p_ucred->cr_uid || \
+ (uc)->cr_uid == (q)->p_ucred->cr_uid)
+
+int sugid_coredump;
+SYSCTL_INT(_kern, OID_AUTO, sugid_coredump, CTLFLAG_RW,
+ &sugid_coredump, 0, "Enable coredumping set user/group ID processes");
+
+static int do_coredump = 1;
+SYSCTL_INT(_kern, OID_AUTO, coredump, CTLFLAG_RW,
+ &do_coredump, 0, "Enable/Disable coredumps");
+
+/*
+ * Signal properties and actions.
+ * The array below categorizes the signals and their default actions
+ * according to the following properties:
+ */
+#define SA_KILL 0x01 /* terminates process by default */
+#define SA_CORE 0x02 /* ditto and coredumps */
+#define SA_STOP 0x04 /* suspend process */
+#define SA_TTYSTOP 0x08 /* ditto, from tty */
+#define SA_IGNORE 0x10 /* ignore by default */
+#define SA_CONT 0x20 /* continue if suspended */
+#define SA_CANTMASK 0x40 /* non-maskable, catchable */
+
+static int sigproptbl[NSIG] = {
+ SA_KILL, /* SIGHUP */
+ SA_KILL, /* SIGINT */
+ SA_KILL|SA_CORE, /* SIGQUIT */
+ SA_KILL|SA_CORE, /* SIGILL */
+ SA_KILL|SA_CORE, /* SIGTRAP */
+ SA_KILL|SA_CORE, /* SIGABRT */
+ SA_KILL|SA_CORE, /* SIGEMT */
+ SA_KILL|SA_CORE, /* SIGFPE */
+ SA_KILL, /* SIGKILL */
+ SA_KILL|SA_CORE, /* SIGBUS */
+ SA_KILL|SA_CORE, /* SIGSEGV */
+ SA_KILL|SA_CORE, /* SIGSYS */
+ SA_KILL, /* SIGPIPE */
+ SA_KILL, /* SIGALRM */
+ SA_KILL, /* SIGTERM */
+ SA_IGNORE, /* SIGURG */
+ SA_STOP, /* SIGSTOP */
+ SA_STOP|SA_TTYSTOP, /* SIGTSTP */
+ SA_IGNORE|SA_CONT, /* SIGCONT */
+ SA_IGNORE, /* SIGCHLD */
+ SA_STOP|SA_TTYSTOP, /* SIGTTIN */
+ SA_STOP|SA_TTYSTOP, /* SIGTTOU */
+ SA_IGNORE, /* SIGIO */
+ SA_KILL, /* SIGXCPU */
+ SA_KILL, /* SIGXFSZ */
+ SA_KILL, /* SIGVTALRM */
+ SA_KILL, /* SIGPROF */
+ SA_IGNORE, /* SIGWINCH */
+ SA_IGNORE, /* SIGINFO */
+ SA_KILL, /* SIGUSR1 */
+ SA_KILL, /* SIGUSR2 */
+};
+
+static __inline int
+sigprop(int sig)
+{
+
+ if (sig > 0 && sig < NSIG)
+ return (sigproptbl[_SIG_IDX(sig)]);
+ return (0);
+}
+
+static __inline int
+sig_ffs(sigset_t *set)
+{
+ int i;
+
+ for (i = 0; i < _SIG_WORDS; i++)
+ if (set->__bits[i])
+ return (ffs(set->__bits[i]) + (i * 32));
+ return (0);
+}
+
+/*
+ * do_sigaction
+ * sigaction
+ * osigaction
+ */
+static int
+do_sigaction(p, sig, act, oact, old)
+ struct proc *p;
+ register int sig;
+ struct sigaction *act, *oact;
+ int old;
+{
+ register struct sigacts *ps = p->p_sigacts;
+
+ if (sig <= 0 || sig > _SIG_MAXSIG)
+ return (EINVAL);
+
+ if (oact) {
+ oact->sa_handler = ps->ps_sigact[_SIG_IDX(sig)];
+ oact->sa_mask = ps->ps_catchmask[_SIG_IDX(sig)];
+ oact->sa_flags = 0;
+ if (SIGISMEMBER(ps->ps_sigonstack, sig))
+ oact->sa_flags |= SA_ONSTACK;
+ if (!SIGISMEMBER(ps->ps_sigintr, sig))
+ oact->sa_flags |= SA_RESTART;
+ if (SIGISMEMBER(ps->ps_sigreset, sig))
+ oact->sa_flags |= SA_RESETHAND;
+ if (SIGISMEMBER(ps->ps_signodefer, sig))
+ oact->sa_flags |= SA_NODEFER;
+ if (SIGISMEMBER(ps->ps_siginfo, sig))
+ oact->sa_flags |= SA_SIGINFO;
+ if (sig == SIGCHLD && p->p_procsig->ps_flag & PS_NOCLDSTOP)
+ oact->sa_flags |= SA_NOCLDSTOP;
+ if (sig == SIGCHLD && p->p_procsig->ps_flag & PS_NOCLDWAIT)
+ oact->sa_flags |= SA_NOCLDWAIT;
+ }
+ if (act) {
+ if ((sig == SIGKILL || sig == SIGSTOP) &&
+ act->sa_handler != SIG_DFL)
+ return (EINVAL);
+
+ /*
+ * Change setting atomically.
+ */
+ (void) splhigh();
+
+ ps->ps_catchmask[_SIG_IDX(sig)] = act->sa_mask;
+ SIG_CANTMASK(ps->ps_catchmask[_SIG_IDX(sig)]);
+ if (act->sa_flags & SA_SIGINFO) {
+ ps->ps_sigact[_SIG_IDX(sig)] = act->sa_handler;
+ SIGADDSET(ps->ps_siginfo, sig);
+ } else {
+ ps->ps_sigact[_SIG_IDX(sig)] =
+ (__sighandler_t *)act->sa_sigaction;
+ SIGDELSET(ps->ps_siginfo, sig);
+ }
+ if (!(act->sa_flags & SA_RESTART))
+ SIGADDSET(ps->ps_sigintr, sig);
+ else
+ SIGDELSET(ps->ps_sigintr, sig);
+ if (act->sa_flags & SA_ONSTACK)
+ SIGADDSET(ps->ps_sigonstack, sig);
+ else
+ SIGDELSET(ps->ps_sigonstack, sig);
+ if (act->sa_flags & SA_RESETHAND)
+ SIGADDSET(ps->ps_sigreset, sig);
+ else
+ SIGDELSET(ps->ps_sigreset, sig);
+ if (act->sa_flags & SA_NODEFER)
+ SIGADDSET(ps->ps_signodefer, sig);
+ else
+ SIGDELSET(ps->ps_signodefer, sig);
+#ifdef COMPAT_SUNOS
+ if (act->sa_flags & SA_USERTRAMP)
+ SIGADDSET(ps->ps_usertramp, sig);
+ else
+ SIGDELSET(ps->ps_usertramp, seg);
+#endif
+ if (sig == SIGCHLD) {
+ if (act->sa_flags & SA_NOCLDSTOP)
+ p->p_procsig->ps_flag |= PS_NOCLDSTOP;
+ else
+ p->p_procsig->ps_flag &= ~PS_NOCLDSTOP;
+ if (act->sa_flags & SA_NOCLDWAIT) {
+ /*
+ * Paranoia: since SA_NOCLDWAIT is implemented
+ * by reparenting the dying child to PID 1 (and
+ * trust it to reap the zombie), PID 1 itself
+ * is forbidden to set SA_NOCLDWAIT.
+ */
+ if (p->p_pid == 1)
+ p->p_procsig->ps_flag &= ~PS_NOCLDWAIT;
+ else
+ p->p_procsig->ps_flag |= PS_NOCLDWAIT;
+ } else
+ p->p_procsig->ps_flag &= ~PS_NOCLDWAIT;
+ }
+ /*
+ * Set bit in p_sigignore for signals that are set to SIG_IGN,
+ * and for signals set to SIG_DFL where the default is to
+ * ignore. However, don't put SIGCONT in p_sigignore, as we
+ * have to restart the process.
+ */
+ if (ps->ps_sigact[_SIG_IDX(sig)] == SIG_IGN ||
+ (sigprop(sig) & SA_IGNORE &&
+ ps->ps_sigact[_SIG_IDX(sig)] == SIG_DFL)) {
+ /* never to be seen again */
+ SIGDELSET(p->p_siglist, sig);
+ if (sig != SIGCONT)
+ /* easier in psignal */
+ SIGADDSET(p->p_sigignore, sig);
+ SIGDELSET(p->p_sigcatch, sig);
+ } else {
+ SIGDELSET(p->p_sigignore, sig);
+ if (ps->ps_sigact[_SIG_IDX(sig)] == SIG_DFL)
+ SIGDELSET(p->p_sigcatch, sig);
+ else
+ SIGADDSET(p->p_sigcatch, sig);
+ }
+ if (ps->ps_sigact[_SIG_IDX(sig)] == SIG_IGN ||
+ ps->ps_sigact[_SIG_IDX(sig)] == SIG_DFL || !old)
+ SIGDELSET(ps->ps_osigset, sig);
+ else
+ SIGADDSET(ps->ps_osigset, sig);
+
+ (void) spl0();
+ }
+ return (0);
+}
+
+#ifndef _SYS_SYSPROTO_H_
+struct sigaction_args {
+ int sig;
+ struct sigaction *act;
+ struct sigaction *oact;
+};
+#endif
+/* ARGSUSED */
+int
+sigaction(p, uap)
+ struct proc *p;
+ register struct sigaction_args *uap;
+{
+ struct sigaction act, oact;
+ register struct sigaction *actp, *oactp;
+ int error;
+
+ actp = (uap->act != NULL) ? &act : NULL;
+ oactp = (uap->oact != NULL) ? &oact : NULL;
+ if (actp) {
+ error = copyin(uap->act, actp, sizeof(act));
+ if (error)
+ return (error);
+ }
+ error = do_sigaction(p, uap->sig, actp, oactp, 0);
+ if (oactp && !error) {
+ error = copyout(oactp, uap->oact, sizeof(oact));
+ }
+ return (error);
+}
+
+#ifndef _SYS_SYSPROTO_H_
+struct osigaction_args {
+ int signum;
+ struct osigaction *nsa;
+ struct osigaction *osa;
+};
+#endif
+/* ARGSUSED */
+int
+osigaction(p, uap)
+ struct proc *p;
+ register struct osigaction_args *uap;
+{
+ struct osigaction sa;
+ struct sigaction nsa, osa;
+ register struct sigaction *nsap, *osap;
+ int error;
+
+ if (uap->signum <= 0 || uap->signum >= ONSIG)
+ return (EINVAL);
+ nsap = (uap->nsa != NULL) ? &nsa : NULL;
+ osap = (uap->osa != NULL) ? &osa : NULL;
+ if (nsap) {
+ error = copyin(uap->nsa, &sa, sizeof(sa));
+ if (error)
+ return (error);
+ nsap->sa_handler = sa.sa_handler;
+ nsap->sa_flags = sa.sa_flags;
+ OSIG2SIG(sa.sa_mask, nsap->sa_mask);
+ }
+ error = do_sigaction(p, uap->signum, nsap, osap, 1);
+ if (osap && !error) {
+ sa.sa_handler = osap->sa_handler;
+ sa.sa_flags = osap->sa_flags;
+ SIG2OSIG(osap->sa_mask, sa.sa_mask);
+ error = copyout(&sa, uap->osa, sizeof(sa));
+ }
+ return (error);
+}
+
+/*
+ * Initialize signal state for process 0;
+ * set to ignore signals that are ignored by default.
+ */
+void
+siginit(p)
+ struct proc *p;
+{
+ register int i;
+
+ for (i = 1; i <= NSIG; i++)
+ if (sigprop(i) & SA_IGNORE && i != SIGCONT)
+ SIGADDSET(p->p_sigignore, i);
+}
+
+/*
+ * Reset signals for an exec of the specified process.
+ */
+void
+execsigs(p)
+ register struct proc *p;
+{
+ register struct sigacts *ps = p->p_sigacts;
+ register int sig;
+
+ /*
+ * Reset caught signals. Held signals remain held
+ * through p_sigmask (unless they were caught,
+ * and are now ignored by default).
+ */
+ while (SIGNOTEMPTY(p->p_sigcatch)) {
+ sig = sig_ffs(&p->p_sigcatch);
+ SIGDELSET(p->p_sigcatch, sig);
+ if (sigprop(sig) & SA_IGNORE) {
+ if (sig != SIGCONT)
+ SIGADDSET(p->p_sigignore, sig);
+ SIGDELSET(p->p_siglist, sig);
+ }
+ ps->ps_sigact[_SIG_IDX(sig)] = SIG_DFL;
+ }
+ /*
+ * Reset stack state to the user stack.
+ * Clear set of signals caught on the signal stack.
+ */
+ p->p_sigstk.ss_flags = SS_DISABLE;
+ p->p_sigstk.ss_size = 0;
+ p->p_sigstk.ss_sp = 0;
+ /*
+ * Reset no zombies if child dies flag as Solaris does.
+ */
+ p->p_procsig->ps_flag &= ~PS_NOCLDWAIT;
+}
+
+/*
+ * do_sigprocmask() - MP SAFE ONLY IF p == curproc
+ *
+ * Manipulate signal mask. This routine is MP SAFE *ONLY* if
+ * p == curproc. Also remember that in order to remain MP SAFE
+ * no spl*() calls may be made.
+ */
+static int
+do_sigprocmask(p, how, set, oset, old)
+ struct proc *p;
+ int how;
+ sigset_t *set, *oset;
+ int old;
+{
+ int error;
+
+ if (oset != NULL)
+ *oset = p->p_sigmask;
+
+ error = 0;
+ if (set != NULL) {
+ switch (how) {
+ case SIG_BLOCK:
+ SIG_CANTMASK(*set);
+ SIGSETOR(p->p_sigmask, *set);
+ break;
+ case SIG_UNBLOCK:
+ SIGSETNAND(p->p_sigmask, *set);
+ break;
+ case SIG_SETMASK:
+ SIG_CANTMASK(*set);
+ if (old)
+ SIGSETLO(p->p_sigmask, *set);
+ else
+ p->p_sigmask = *set;
+ break;
+ default:
+ error = EINVAL;
+ break;
+ }
+ }
+ return (error);
+}
+
+/*
+ * sigprocmask() - MP SAFE
+ */
+
+#ifndef _SYS_SYSPROTO_H_
+struct sigprocmask_args {
+ int how;
+ const sigset_t *set;
+ sigset_t *oset;
+};
+#endif
+int
+sigprocmask(p, uap)
+ register struct proc *p;
+ struct sigprocmask_args *uap;
+{
+ sigset_t set, oset;
+ sigset_t *setp, *osetp;
+ int error;
+
+ setp = (uap->set != NULL) ? &set : NULL;
+ osetp = (uap->oset != NULL) ? &oset : NULL;
+ if (setp) {
+ error = copyin(uap->set, setp, sizeof(set));
+ if (error)
+ return (error);
+ }
+ error = do_sigprocmask(p, uap->how, setp, osetp, 0);
+ if (osetp && !error) {
+ error = copyout(osetp, uap->oset, sizeof(oset));
+ }
+ return (error);
+}
+
+/*
+ * osigprocmask() - MP SAFE
+ */
+
+#ifndef _SYS_SYSPROTO_H_
+struct osigprocmask_args {
+ int how;
+ osigset_t mask;
+};
+#endif
+int
+osigprocmask(p, uap)
+ register struct proc *p;
+ struct osigprocmask_args *uap;
+{
+ sigset_t set, oset;
+ int error;
+
+ OSIG2SIG(uap->mask, set);
+ error = do_sigprocmask(p, uap->how, &set, &oset, 1);
+ SIG2OSIG(oset, p->p_retval[0]);
+ return (error);
+}
+
+#ifndef _SYS_SYSPROTO_H_
+struct sigpending_args {
+ sigset_t *set;
+};
+#endif
+/* ARGSUSED */
+int
+sigpending(p, uap)
+ struct proc *p;
+ struct sigpending_args *uap;
+{
+
+ return (copyout(&p->p_siglist, uap->set, sizeof(sigset_t)));
+}
+
+#ifndef _SYS_SYSPROTO_H_
+struct osigpending_args {
+ int dummy;
+};
+#endif
+/* ARGSUSED */
+int
+osigpending(p, uap)
+ struct proc *p;
+ struct osigpending_args *uap;
+{
+
+ SIG2OSIG(p->p_siglist, p->p_retval[0]);
+ return (0);
+}
+
+#if defined(COMPAT_43) || defined(COMPAT_SUNOS)
+/*
+ * Generalized interface signal handler, 4.3-compatible.
+ */
+#ifndef _SYS_SYSPROTO_H_
+struct osigvec_args {
+ int signum;
+ struct sigvec *nsv;
+ struct sigvec *osv;
+};
+#endif
+/* ARGSUSED */
+int
+osigvec(p, uap)
+ struct proc *p;
+ register struct osigvec_args *uap;
+{
+ struct sigvec vec;
+ struct sigaction nsa, osa;
+ register struct sigaction *nsap, *osap;
+ int error;
+
+ if (uap->signum <= 0 || uap->signum >= ONSIG)
+ return (EINVAL);
+ nsap = (uap->nsv != NULL) ? &nsa : NULL;
+ osap = (uap->osv != NULL) ? &osa : NULL;
+ if (nsap) {
+ error = copyin(uap->nsv, &vec, sizeof(vec));
+ if (error)
+ return (error);
+ nsap->sa_handler = vec.sv_handler;
+ OSIG2SIG(vec.sv_mask, nsap->sa_mask);
+ nsap->sa_flags = vec.sv_flags;
+ nsap->sa_flags ^= SA_RESTART; /* opposite of SV_INTERRUPT */
+#ifdef COMPAT_SUNOS
+ nsap->sa_flags |= SA_USERTRAMP;
+#endif
+ }
+ error = do_sigaction(p, uap->signum, nsap, osap, 1);
+ if (osap && !error) {
+ vec.sv_handler = osap->sa_handler;
+ SIG2OSIG(osap->sa_mask, vec.sv_mask);
+ vec.sv_flags = osap->sa_flags;
+ vec.sv_flags &= ~SA_NOCLDWAIT;
+ vec.sv_flags ^= SA_RESTART;
+#ifdef COMPAT_SUNOS
+ vec.sv_flags &= ~SA_NOCLDSTOP;
+#endif
+ error = copyout(&vec, uap->osv, sizeof(vec));
+ }
+ return (error);
+}
+
+#ifndef _SYS_SYSPROTO_H_
+struct osigblock_args {
+ int mask;
+};
+#endif
+int
+osigblock(p, uap)
+ register struct proc *p;
+ struct osigblock_args *uap;
+{
+ sigset_t set;
+
+ OSIG2SIG(uap->mask, set);
+ SIG_CANTMASK(set);
+ (void) splhigh();
+ SIG2OSIG(p->p_sigmask, p->p_retval[0]);
+ SIGSETOR(p->p_sigmask, set);
+ (void) spl0();
+ return (0);
+}
+
+#ifndef _SYS_SYSPROTO_H_
+struct osigsetmask_args {
+ int mask;
+};
+#endif
+int
+osigsetmask(p, uap)
+ struct proc *p;
+ struct osigsetmask_args *uap;
+{
+ sigset_t set;
+
+ OSIG2SIG(uap->mask, set);
+ SIG_CANTMASK(set);
+ (void) splhigh();
+ SIG2OSIG(p->p_sigmask, p->p_retval[0]);
+ SIGSETLO(p->p_sigmask, set);
+ (void) spl0();
+ return (0);
+}
+#endif /* COMPAT_43 || COMPAT_SUNOS */
+
+/*
+ * Suspend process until signal, providing mask to be set
+ * in the meantime. Note nonstandard calling convention:
+ * libc stub passes mask, not pointer, to save a copyin.
+ */
+#ifndef _SYS_SYSPROTO_H_
+struct sigsuspend_args {
+ const sigset_t *sigmask;
+};
+#endif
+/* ARGSUSED */
+int
+sigsuspend(p, uap)
+ register struct proc *p;
+ struct sigsuspend_args *uap;
+{
+ sigset_t mask;
+ register struct sigacts *ps = p->p_sigacts;
+ int error;
+
+ error = copyin(uap->sigmask, &mask, sizeof(mask));
+ if (error)
+ return (error);
+
+ /*
+ * When returning from sigsuspend, we want
+ * the old mask to be restored after the
+ * signal handler has finished. Thus, we
+ * save it here and mark the sigacts structure
+ * to indicate this.
+ */
+ p->p_oldsigmask = p->p_sigmask;
+ p->p_flag |= P_OLDMASK;
+
+ SIG_CANTMASK(mask);
+ p->p_sigmask = mask;
+ while (tsleep((caddr_t) ps, PPAUSE|PCATCH, "pause", 0) == 0)
+ /* void */;
+ /* always return EINTR rather than ERESTART... */
+ return (EINTR);
+}
+
+#ifndef _SYS_SYSPROTO_H_
+struct osigsuspend_args {
+ osigset_t mask;
+};
+#endif
+/* ARGSUSED */
+int
+osigsuspend(p, uap)
+ register struct proc *p;
+ struct osigsuspend_args *uap;
+{
+ sigset_t mask;
+ register struct sigacts *ps = p->p_sigacts;
+
+ p->p_oldsigmask = p->p_sigmask;
+ p->p_flag |= P_OLDMASK;
+ OSIG2SIG(uap->mask, mask);
+ SIG_CANTMASK(mask);
+ SIGSETLO(p->p_sigmask, mask);
+ while (tsleep((caddr_t) ps, PPAUSE|PCATCH, "opause", 0) == 0)
+ /* void */;
+ /* always return EINTR rather than ERESTART... */
+ return (EINTR);
+}
+
+#if defined(COMPAT_43) || defined(COMPAT_SUNOS)
+#ifndef _SYS_SYSPROTO_H_
+struct osigstack_args {
+ struct sigstack *nss;
+ struct sigstack *oss;
+};
+#endif
+/* ARGSUSED */
+int
+osigstack(p, uap)
+ struct proc *p;
+ register struct osigstack_args *uap;
+{
+ struct sigstack ss;
+ int error = 0;
+
+ ss.ss_sp = p->p_sigstk.ss_sp;
+ ss.ss_onstack = p->p_sigstk.ss_flags & SS_ONSTACK;
+ if (uap->oss && (error = copyout(&ss, uap->oss,
+ sizeof(struct sigstack))))
+ return (error);
+ if (uap->nss && (error = copyin(uap->nss, &ss, sizeof(ss))) == 0) {
+ p->p_sigstk.ss_sp = ss.ss_sp;
+ p->p_sigstk.ss_size = 0;
+ p->p_sigstk.ss_flags |= ss.ss_onstack & SS_ONSTACK;
+ p->p_flag |= P_ALTSTACK;
+ }
+ return (error);
+}
+#endif /* COMPAT_43 || COMPAT_SUNOS */
+
+#ifndef _SYS_SYSPROTO_H_
+struct sigaltstack_args {
+ stack_t *ss;
+ stack_t *oss;
+};
+#endif
+/* ARGSUSED */
+int
+sigaltstack(p, uap)
+ struct proc *p;
+ register struct sigaltstack_args *uap;
+{
+ stack_t ss;
+ int error;
+
+ if ((p->p_flag & P_ALTSTACK) == 0)
+ p->p_sigstk.ss_flags |= SS_DISABLE;
+ if (uap->oss && (error = copyout(&p->p_sigstk, uap->oss,
+ sizeof(stack_t))))
+ return (error);
+ if (uap->ss == 0)
+ return (0);
+ if ((error = copyin(uap->ss, &ss, sizeof(ss))))
+ return (error);
+ if (ss.ss_flags & SS_DISABLE) {
+ if (p->p_sigstk.ss_flags & SS_ONSTACK)
+ return (EINVAL);
+ p->p_flag &= ~P_ALTSTACK;
+ p->p_sigstk.ss_flags = ss.ss_flags;
+ return (0);
+ }
+ if (ss.ss_size < MINSIGSTKSZ)
+ return (ENOMEM);
+ p->p_flag |= P_ALTSTACK;
+ p->p_sigstk = ss;
+ return (0);
+}
+
+/*
+ * Common code for kill process group/broadcast kill.
+ * cp is calling process.
+ */
+int
+killpg1(cp, sig, pgid, all)
+ register struct proc *cp;
+ int sig, pgid, all;
+{
+ register struct proc *p;
+ struct pgrp *pgrp;
+ int nfound = 0;
+
+ if (all)
+ /*
+ * broadcast
+ */
+ LIST_FOREACH(p, &allproc, p_list) {
+ if (p->p_pid <= 1 || p->p_flag & P_SYSTEM ||
+ p == cp || !CANSIGNAL(cp, p, sig))
+ continue;
+ nfound++;
+ if (sig)
+ psignal(p, sig);
+ }
+ 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);
+ }
+ LIST_FOREACH(p, &pgrp->pg_members, p_pglist) {
+ if (p->p_pid <= 1 || p->p_flag & P_SYSTEM ||
+ p->p_stat == SZOMB ||
+ !CANSIGNAL(cp, p, sig))
+ continue;
+ nfound++;
+ if (sig)
+ psignal(p, sig);
+ }
+ }
+ return (nfound ? 0 : ESRCH);
+}
+
+#ifndef _SYS_SYSPROTO_H_
+struct kill_args {
+ int pid;
+ int signum;
+};
+#endif
+/* ARGSUSED */
+int
+kill(cp, uap)
+ register struct proc *cp;
+ register struct kill_args *uap;
+{
+ register struct proc *p;
+
+ if ((u_int)uap->signum > _SIG_MAXSIG)
+ return (EINVAL);
+ if (uap->pid > 0) {
+ /* kill single process */
+ if ((p = pfind(uap->pid)) == NULL)
+ return (ESRCH);
+ if (!CANSIGNAL(cp, 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)
+ struct proc *p;
+ register struct okillpg_args *uap;
+{
+
+ if ((u_int)uap->signum > _SIG_MAXSIG)
+ 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, sig)
+ int pgid, sig;
+{
+ struct pgrp *pgrp;
+
+ if (pgid && (pgrp = pgfind(pgid)))
+ pgsignal(pgrp, sig, 0);
+}
+
+/*
+ * Send a signal to a process group. If checktty is 1,
+ * limit to members which have a controlling terminal.
+ */
+void
+pgsignal(pgrp, sig, checkctty)
+ struct pgrp *pgrp;
+ int sig, checkctty;
+{
+ register struct proc *p;
+
+ if (pgrp)
+ LIST_FOREACH(p, &pgrp->pg_members, p_pglist)
+ if (checkctty == 0 || p->p_flag & P_CONTROLT)
+ psignal(p, sig);
+}
+
+/*
+ * 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, sig, code)
+ struct proc *p;
+ register int sig;
+ u_long code;
+{
+ register struct sigacts *ps = p->p_sigacts;
+
+ if ((p->p_flag & P_TRACED) == 0 && SIGISMEMBER(p->p_sigcatch, sig) &&
+ SIGISMEMBER(p->p_sigmask, sig)) {
+ p->p_stats->p_ru.ru_nsignals++;
+#ifdef KTRACE
+ if (KTRPOINT(p, KTR_PSIG))
+ ktrpsig(p->p_tracep, sig, ps->ps_sigact[_SIG_IDX(sig)],
+ &p->p_sigmask, code);
+#endif
+ (*p->p_sysent->sv_sendsig)(ps->ps_sigact[_SIG_IDX(sig)], sig,
+ &p->p_sigmask, code);
+ SIGSETOR(p->p_sigmask, ps->ps_catchmask[_SIG_IDX(sig)]);
+ if (!SIGISMEMBER(ps->ps_signodefer, sig))
+ SIGADDSET(p->p_sigmask, sig);
+ if (SIGISMEMBER(ps->ps_sigreset, sig)) {
+ /*
+ * See do_sigaction() for origin of this code.
+ */
+ SIGDELSET(p->p_sigcatch, sig);
+ if (sig != SIGCONT &&
+ sigprop(sig) & SA_IGNORE)
+ SIGADDSET(p->p_sigignore, sig);
+ ps->ps_sigact[_SIG_IDX(sig)] = SIG_DFL;
+ }
+ } else {
+ p->p_code = code; /* XXX for core dump/debugger */
+ p->p_sig = sig; /* XXX to verify code */
+ psignal(p, sig);
+ }
+}
+
+/*
+ * 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, sig)
+ register struct proc *p;
+ register int sig;
+{
+ register int s, prop;
+ register sig_t action;
+
+ if (sig > _SIG_MAXSIG || sig <= 0) {
+ printf("psignal: signal %d\n", sig);
+ panic("psignal signal number");
+ }
+
+ KNOTE(&p->p_klist, NOTE_SIGNAL | sig);
+
+ prop = sigprop(sig);
+
+ /*
+ * If proc is traced, always give parent a chance;
+ * if signal event is tracked by procfs, give *that*
+ * a chance, as well.
+ */
+ if ((p->p_flag & P_TRACED) || (p->p_stops & S_SIG))
+ 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 (SIGISMEMBER(p->p_sigignore, sig) || (p->p_flag & P_WEXIT))
+ return;
+ if (SIGISMEMBER(p->p_sigmask, sig))
+ action = SIG_HOLD;
+ else if (SIGISMEMBER(p->p_sigcatch, sig))
+ 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)
+ SIG_STOPSIGMASK(p->p_siglist);
+
+ 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;
+ SIG_CONTSIGMASK(p->p_siglist);
+ }
+ SIGADDSET(p->p_siglist, sig);
+
+ /*
+ * Defer further processing for signals which are held,
+ * except that stopped processes must be continued by SIGCONT.
+ */
+ if (action == SIG_HOLD && (!(prop & SA_CONT) || 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) {
+ SIGDELSET(p->p_siglist, sig);
+ 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;
+ SIGDELSET(p->p_siglist, sig);
+ p->p_xstat = sig;
+ if ((p->p_pptr->p_procsig->ps_flag & PS_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 (sig == 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)
+ SIGDELSET(p->p_siglist, sig);
+ 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.)
+ */
+ SIGDELSET(p->p_siglist, sig);
+ 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);
+#ifdef SMP
+ else if (p->p_stat == SRUN)
+ forward_signal(p);
+#endif
+ 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 (sig = CURSIG(curproc))
+ * postsig(sig);
+ */
+int
+issignal(p)
+ register struct proc *p;
+{
+ sigset_t mask;
+ register int sig, prop;
+
+ for (;;) {
+ int traced = (p->p_flag & P_TRACED) || (p->p_stops & S_SIG);
+
+ mask = p->p_siglist;
+ SIGSETNAND(mask, p->p_sigmask);
+ if (p->p_flag & P_PPWAIT)
+ SIG_STOPSIGMASK(mask);
+ if (!SIGNOTEMPTY(mask)) /* no signal to send */
+ return (0);
+ sig = sig_ffs(&mask);
+ prop = sigprop(sig);
+
+ STOPEVENT(p, S_SIG, sig);
+
+ /*
+ * We should see pending but ignored signals
+ * only if P_TRACED was on when they were posted.
+ */
+ if (SIGISMEMBER(p->p_sigignore, sig) && (traced == 0)) {
+ SIGDELSET(p->p_siglist, sig);
+ 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 = sig;
+ 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.
+ */
+ SIGDELSET(p->p_siglist, sig); /* clear old signal */
+ sig = p->p_xstat;
+ if (sig == 0)
+ continue;
+
+ /*
+ * Put the new signal into p_siglist. If the
+ * signal is being masked, look for other signals.
+ */
+ SIGADDSET(p->p_siglist, sig);
+ if (SIGISMEMBER(p->p_sigmask, sig))
+ 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)(intptr_t)p->p_sigacts->ps_sigact[_SIG_IDX(sig)]) {
+
+ 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, sig);
+#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 = sig;
+ stop(p);
+ if ((p->p_pptr->p_procsig->ps_flag & PS_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 (sig);
+ /*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 (sig);
+ }
+ SIGDELSET(p->p_siglist, sig); /* 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(sig)
+ register int sig;
+{
+ register struct proc *p = curproc;
+ struct sigacts *ps = p->p_sigacts;
+ sig_t action;
+ sigset_t returnmask;
+ int code;
+
+ KASSERT(sig != 0, ("postsig"));
+
+ SIGDELSET(p->p_siglist, sig);
+ action = ps->ps_sigact[_SIG_IDX(sig)];
+#ifdef KTRACE
+ if (KTRPOINT(p, KTR_PSIG))
+ ktrpsig(p->p_tracep, sig, action, p->p_flag & P_OLDMASK ?
+ &p->p_oldsigmask : &p->p_sigmask, 0);
+#endif
+ STOPEVENT(p, S_SIG, sig);
+
+ if (action == SIG_DFL) {
+ /*
+ * Default action, where the default is to kill
+ * the process. (Other cases were ignored above.)
+ */
+ sigexit(p, sig);
+ /* NOTREACHED */
+ } else {
+ /*
+ * If we get here, the signal must be caught.
+ */
+ KASSERT(action != SIG_IGN && !SIGISMEMBER(p->p_sigmask, sig),
+ ("postsig action"));
+ /*
+ * Set the new mask value and also defer further
+ * occurrences of this signal.
+ *
+ * Special case: user has done a sigsuspend. Here the
+ * current mask is not of interest, but rather the
+ * mask from before the sigsuspend is what we want
+ * restored after the signal processing is completed.
+ */
+ (void) splhigh();
+ if (p->p_flag & P_OLDMASK) {
+ returnmask = p->p_oldsigmask;
+ p->p_flag &= ~P_OLDMASK;
+ } else
+ returnmask = p->p_sigmask;
+
+ SIGSETOR(p->p_sigmask, ps->ps_catchmask[_SIG_IDX(sig)]);
+ if (!SIGISMEMBER(ps->ps_signodefer, sig))
+ SIGADDSET(p->p_sigmask, sig);
+
+ if (SIGISMEMBER(ps->ps_sigreset, sig)) {
+ /*
+ * See do_sigaction() for origin of this code.
+ */
+ SIGDELSET(p->p_sigcatch, sig);
+ if (sig != SIGCONT &&
+ sigprop(sig) & SA_IGNORE)
+ SIGADDSET(p->p_sigignore, sig);
+ ps->ps_sigact[_SIG_IDX(sig)] = SIG_DFL;
+ }
+ (void) spl0();
+ p->p_stats->p_ru.ru_nsignals++;
+ if (p->p_sig != sig) {
+ code = 0;
+ } else {
+ code = p->p_code;
+ p->p_code = 0;
+ p->p_sig = 0;
+ }
+ (*p->p_sysent->sv_sendsig)(action, sig, &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, sig)
+ register struct proc *p;
+ int sig;
+{
+
+ p->p_acflag |= AXSIG;
+ if (sigprop(sig) & SA_CORE) {
+ p->p_sig = sig;
+ /*
+ * 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)
+ sig |= WCOREFLAG;
+ if (kern_logsigexit)
+ 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,
+ sig &~ WCOREFLAG,
+ sig & WCOREFLAG ? " (core dumped)" : "");
+ }
+ exit1(p, W_EXITCODE(0, sig));
+ /* NOTREACHED */
+}
+
+static char corefilename[MAXPATHLEN+1] = {"%N.core"};
+SYSCTL_STRING(_kern, OID_AUTO, corefile, CTLFLAG_RW, corefilename,
+ sizeof(corefilename), "process corefile name format string");
+
+/*
+ * expand_name(name, uid, pid)
+ * Expand the name described in corefilename, using name, uid, and pid.
+ * corefilename is a printf-like string, with three format specifiers:
+ * %N name of process ("name")
+ * %P process id (pid)
+ * %U user id (uid)
+ * For example, "%N.core" is the default; they can be disabled completely
+ * by using "/dev/null", or all core files can be stored in "/cores/%U/%N-%P".
+ * This is controlled by the sysctl variable kern.corefile (see above).
+ */
+
+static char *
+expand_name(name, uid, pid)
+const char *name; uid_t uid; pid_t pid; {
+ char *temp;
+ char buf[11]; /* Buffer for pid/uid -- max 4B */
+ int i, n;
+ char *format = corefilename;
+ size_t namelen;
+
+ temp = malloc(MAXPATHLEN + 1, M_TEMP, M_NOWAIT);
+ if (temp == NULL)
+ return NULL;
+ namelen = strlen(name);
+ for (i = 0, n = 0; n < MAXPATHLEN && format[i]; i++) {
+ int l;
+ switch (format[i]) {
+ case '%': /* Format character */
+ i++;
+ switch (format[i]) {
+ case '%':
+ temp[n++] = '%';
+ break;
+ case 'N': /* process name */
+ if ((n + namelen) > MAXPATHLEN) {
+ log(LOG_ERR, "pid %d (%s), uid (%u): Path `%s%s' is too long\n",
+ pid, name, uid, temp, name);
+ free(temp, M_TEMP);
+ return NULL;
+ }
+ memcpy(temp+n, name, namelen);
+ n += namelen;
+ break;
+ case 'P': /* process id */
+ l = sprintf(buf, "%u", pid);
+ if ((n + l) > MAXPATHLEN) {
+ log(LOG_ERR, "pid %d (%s), uid (%u): Path `%s%s' is too long\n",
+ pid, name, uid, temp, name);
+ free(temp, M_TEMP);
+ return NULL;
+ }
+ memcpy(temp+n, buf, l);
+ n += l;
+ break;
+ case 'U': /* user id */
+ l = sprintf(buf, "%u", uid);
+ if ((n + l) > MAXPATHLEN) {
+ log(LOG_ERR, "pid %d (%s), uid (%u): Path `%s%s' is too long\n",
+ pid, name, uid, temp, name);
+ free(temp, M_TEMP);
+ return NULL;
+ }
+ memcpy(temp+n, buf, l);
+ n += l;
+ break;
+ default:
+ log(LOG_ERR, "Unknown format character %c in `%s'\n", format[i], format);
+ }
+ break;
+ default:
+ temp[n++] = format[i];
+ }
+ }
+ temp[n] = '\0';
+ return temp;
+}
+
+/*
+ * Dump a process' core. The main routine does some
+ * policy checking, and creates the name of the coredump;
+ * then it passes on a vnode and a size limit to the process-specific
+ * coredump routine if there is one; if there _is not_ one, it returns
+ * ENOSYS; otherwise it returns the error from the process-specific routine.
+ */
+
+static int
+coredump(p)
+ register struct proc *p;
+{
+ register struct vnode *vp;
+ register struct ucred *cred = p->p_ucred;
+ struct nameidata nd;
+ struct vattr vattr;
+ int error, error1;
+ char *name; /* name of corefile */
+ off_t limit;
+
+ STOPEVENT(p, S_CORE, 0);
+
+ if (((sugid_coredump == 0) && p->p_flag & P_SUGID) || do_coredump == 0)
+ return (EFAULT);
+
+ /*
+ * Note that the bulk of limit checking is done after
+ * the corefile is created. The exception is if the limit
+ * for corefiles is 0, in which case we don't bother
+ * creating the corefile at all. This layout means that
+ * a corefile is truncated instead of not being created,
+ * if it is larger than the limit.
+ */
+ limit = p->p_rlimit[RLIMIT_CORE].rlim_cur;
+ if (limit == 0)
+ return 0;
+
+ name = expand_name(p->p_comm, p->p_ucred->cr_uid, p->p_pid);
+ NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_SYSSPACE, name, p);
+ error = vn_open(&nd, O_CREAT | FWRITE | O_NOFOLLOW, S_IRUSR | S_IWUSR);
+ free(name, M_TEMP);
+ if (error)
+ return (error);
+ NDFREE(&nd, NDF_ONLY_PNBUF);
+ 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;
+
+ error = p->p_sysent->sv_coredump ?
+ p->p_sysent->sv_coredump(p, vp, limit) :
+ ENOSYS;
+
+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)
+ struct proc *p;
+ struct nosys_args *args;
+{
+
+ psignal(p, SIGSYS);
+ return (EINVAL);
+}
+
+/*
+ * Send a signal to a SIGIO or SIGURG to a process or process group using
+ * stored credentials rather than those of the current process.
+ */
+void
+pgsigio(sigio, sig, checkctty)
+ struct sigio *sigio;
+ int sig, checkctty;
+{
+ if (sigio == NULL)
+ return;
+
+ if (sigio->sio_pgid > 0) {
+ if (CANSIGIO(sigio->sio_ruid, sigio->sio_ucred,
+ sigio->sio_proc))
+ psignal(sigio->sio_proc, sig);
+ } else if (sigio->sio_pgid < 0) {
+ struct proc *p;
+
+ LIST_FOREACH(p, &sigio->sio_pgrp->pg_members, p_pglist)
+ if (CANSIGIO(sigio->sio_ruid, sigio->sio_ucred, p) &&
+ (checkctty == 0 || (p->p_flag & P_CONTROLT)))
+ psignal(p, sig);
+ }
+}
+
+static int
+filt_sigattach(struct knote *kn)
+{
+ struct proc *p = curproc;
+
+ kn->kn_ptr.p_proc = p;
+ kn->kn_flags |= EV_CLEAR; /* automatically set */
+
+ /* XXX lock the proc here while adding to the list? */
+ SLIST_INSERT_HEAD(&p->p_klist, kn, kn_selnext);
+
+ return (0);
+}
+
+static void
+filt_sigdetach(struct knote *kn)
+{
+ struct proc *p = kn->kn_ptr.p_proc;
+
+ SLIST_REMOVE(&p->p_klist, kn, knote, kn_selnext);
+}
+
+/*
+ * signal knotes are shared with proc knotes, so we apply a mask to
+ * the hint in order to differentiate them from process hints. This
+ * could be avoided by using a signal-specific knote list, but probably
+ * isn't worth the trouble.
+ */
+static int
+filt_signal(struct knote *kn, long hint)
+{
+
+ if (hint & NOTE_SIGNAL) {
+ hint &= ~NOTE_SIGNAL;
+
+ if (kn->kn_id == hint)
+ kn->kn_data++;
+ }
+ return (kn->kn_data != 0);
+}
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