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5 * All or some portions of this file are derived from material licensed
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38 * @(#)kern_sig.c 8.7 (Berkeley) 4/18/94
39 * $FreeBSD: src/sys/kern/kern_sig.c,v 1.72.2.17 2003/05/16 16:34:34 obrien Exp $
40 * $DragonFly: src/sys/kern/kern_sig.c,v 1.68 2007/02/21 15:46:48 corecode Exp $
43 #include "opt_ktrace.h"
45 #include <sys/param.h>
46 #include <sys/systm.h>
47 #include <sys/kernel.h>
48 #include <sys/sysproto.h>
49 #include <sys/signalvar.h>
50 #include <sys/resourcevar.h>
51 #include <sys/vnode.h>
52 #include <sys/event.h>
54 #include <sys/nlookup.h>
55 #include <sys/pioctl.h>
56 #include <sys/systm.h>
58 #include <sys/fcntl.h>
61 #include <sys/ktrace.h>
62 #include <sys/syslog.h>
64 #include <sys/sysent.h>
65 #include <sys/sysctl.h>
66 #include <sys/malloc.h>
67 #include <sys/interrupt.h>
68 #include <sys/unistd.h>
69 #include <sys/kern_syscall.h>
70 #include <sys/vkernel.h>
71 #include <sys/thread2.h>
73 #include <machine/cpu.h>
74 #include <machine/smp.h>
76 static int coredump(struct lwp
*, int);
77 static char *expand_name(const char *, uid_t
, pid_t
);
78 static int dokillpg(int sig
, int pgid
, int all
);
79 static int sig_ffs(sigset_t
*set
);
80 static int sigprop(int sig
);
82 static void signotify_remote(void *arg
);
84 static int kern_sigtimedwait(sigset_t set
, siginfo_t
*info
,
85 struct timespec
*timeout
);
87 static int filt_sigattach(struct knote
*kn
);
88 static void filt_sigdetach(struct knote
*kn
);
89 static int filt_signal(struct knote
*kn
, long hint
);
91 struct filterops sig_filtops
=
92 { 0, filt_sigattach
, filt_sigdetach
, filt_signal
};
94 static int kern_logsigexit
= 1;
95 SYSCTL_INT(_kern
, KERN_LOGSIGEXIT
, logsigexit
, CTLFLAG_RW
,
97 "Log processes quitting on abnormal signals to syslog(3)");
100 * Can process p, with pcred pc, send the signal sig to process q?
102 #define CANSIGNAL(q, sig) \
103 (!p_trespass(curproc->p_ucred, (q)->p_ucred) || \
104 ((sig) == SIGCONT && (q)->p_session == curproc->p_session))
107 * Policy -- Can real uid ruid with ucred uc send a signal to process q?
109 #define CANSIGIO(ruid, uc, q) \
110 ((uc)->cr_uid == 0 || \
111 (ruid) == (q)->p_ucred->cr_ruid || \
112 (uc)->cr_uid == (q)->p_ucred->cr_ruid || \
113 (ruid) == (q)->p_ucred->cr_uid || \
114 (uc)->cr_uid == (q)->p_ucred->cr_uid)
117 SYSCTL_INT(_kern
, OID_AUTO
, sugid_coredump
, CTLFLAG_RW
,
118 &sugid_coredump
, 0, "Enable coredumping set user/group ID processes");
120 static int do_coredump
= 1;
121 SYSCTL_INT(_kern
, OID_AUTO
, coredump
, CTLFLAG_RW
,
122 &do_coredump
, 0, "Enable/Disable coredumps");
125 * Signal properties and actions.
126 * The array below categorizes the signals and their default actions
127 * according to the following properties:
129 #define SA_KILL 0x01 /* terminates process by default */
130 #define SA_CORE 0x02 /* ditto and coredumps */
131 #define SA_STOP 0x04 /* suspend process */
132 #define SA_TTYSTOP 0x08 /* ditto, from tty */
133 #define SA_IGNORE 0x10 /* ignore by default */
134 #define SA_CONT 0x20 /* continue if suspended */
135 #define SA_CANTMASK 0x40 /* non-maskable, catchable */
136 #define SA_CKPT 0x80 /* checkpoint process */
139 static int sigproptbl
[NSIG
] = {
140 SA_KILL
, /* SIGHUP */
141 SA_KILL
, /* SIGINT */
142 SA_KILL
|SA_CORE
, /* SIGQUIT */
143 SA_KILL
|SA_CORE
, /* SIGILL */
144 SA_KILL
|SA_CORE
, /* SIGTRAP */
145 SA_KILL
|SA_CORE
, /* SIGABRT */
146 SA_KILL
|SA_CORE
, /* SIGEMT */
147 SA_KILL
|SA_CORE
, /* SIGFPE */
148 SA_KILL
, /* SIGKILL */
149 SA_KILL
|SA_CORE
, /* SIGBUS */
150 SA_KILL
|SA_CORE
, /* SIGSEGV */
151 SA_KILL
|SA_CORE
, /* SIGSYS */
152 SA_KILL
, /* SIGPIPE */
153 SA_KILL
, /* SIGALRM */
154 SA_KILL
, /* SIGTERM */
155 SA_IGNORE
, /* SIGURG */
156 SA_STOP
, /* SIGSTOP */
157 SA_STOP
|SA_TTYSTOP
, /* SIGTSTP */
158 SA_IGNORE
|SA_CONT
, /* SIGCONT */
159 SA_IGNORE
, /* SIGCHLD */
160 SA_STOP
|SA_TTYSTOP
, /* SIGTTIN */
161 SA_STOP
|SA_TTYSTOP
, /* SIGTTOU */
162 SA_IGNORE
, /* SIGIO */
163 SA_KILL
, /* SIGXCPU */
164 SA_KILL
, /* SIGXFSZ */
165 SA_KILL
, /* SIGVTALRM */
166 SA_KILL
, /* SIGPROF */
167 SA_IGNORE
, /* SIGWINCH */
168 SA_IGNORE
, /* SIGINFO */
169 SA_KILL
, /* SIGUSR1 */
170 SA_KILL
, /* SIGUSR2 */
171 SA_IGNORE
, /* SIGTHR */
172 SA_CKPT
, /* SIGCKPT */
173 SA_KILL
|SA_CKPT
, /* SIGCKPTEXIT */
211 if (sig
> 0 && sig
< NSIG
)
212 return (sigproptbl
[_SIG_IDX(sig
)]);
217 sig_ffs(sigset_t
*set
)
221 for (i
= 0; i
< _SIG_WORDS
; i
++)
223 return (ffs(set
->__bits
[i
]) + (i
* 32));
228 kern_sigaction(int sig
, struct sigaction
*act
, struct sigaction
*oact
)
230 struct thread
*td
= curthread
;
231 struct proc
*p
= td
->td_proc
;
233 struct sigacts
*ps
= p
->p_sigacts
;
235 if (sig
<= 0 || sig
> _SIG_MAXSIG
)
239 oact
->sa_handler
= ps
->ps_sigact
[_SIG_IDX(sig
)];
240 oact
->sa_mask
= ps
->ps_catchmask
[_SIG_IDX(sig
)];
242 if (SIGISMEMBER(ps
->ps_sigonstack
, sig
))
243 oact
->sa_flags
|= SA_ONSTACK
;
244 if (!SIGISMEMBER(ps
->ps_sigintr
, sig
))
245 oact
->sa_flags
|= SA_RESTART
;
246 if (SIGISMEMBER(ps
->ps_sigreset
, sig
))
247 oact
->sa_flags
|= SA_RESETHAND
;
248 if (SIGISMEMBER(ps
->ps_signodefer
, sig
))
249 oact
->sa_flags
|= SA_NODEFER
;
250 if (SIGISMEMBER(ps
->ps_siginfo
, sig
))
251 oact
->sa_flags
|= SA_SIGINFO
;
252 if (SIGISMEMBER(ps
->ps_sigmailbox
, sig
))
253 oact
->sa_flags
|= SA_MAILBOX
;
254 if (sig
== SIGCHLD
&& p
->p_procsig
->ps_flag
& PS_NOCLDSTOP
)
255 oact
->sa_flags
|= SA_NOCLDSTOP
;
256 if (sig
== SIGCHLD
&& p
->p_procsig
->ps_flag
& PS_NOCLDWAIT
)
257 oact
->sa_flags
|= SA_NOCLDWAIT
;
261 * Check for invalid requests. KILL and STOP cannot be
264 if (sig
== SIGKILL
|| sig
== SIGSTOP
) {
265 if (act
->sa_handler
!= SIG_DFL
)
268 /* (not needed, SIG_DFL forces action to occur) */
269 if (act
->sa_flags
& SA_MAILBOX
)
275 * Change setting atomically.
279 ps
->ps_catchmask
[_SIG_IDX(sig
)] = act
->sa_mask
;
280 SIG_CANTMASK(ps
->ps_catchmask
[_SIG_IDX(sig
)]);
281 if (act
->sa_flags
& SA_SIGINFO
) {
282 ps
->ps_sigact
[_SIG_IDX(sig
)] =
283 (__sighandler_t
*)act
->sa_sigaction
;
284 SIGADDSET(ps
->ps_siginfo
, sig
);
286 ps
->ps_sigact
[_SIG_IDX(sig
)] = act
->sa_handler
;
287 SIGDELSET(ps
->ps_siginfo
, sig
);
289 if (!(act
->sa_flags
& SA_RESTART
))
290 SIGADDSET(ps
->ps_sigintr
, sig
);
292 SIGDELSET(ps
->ps_sigintr
, sig
);
293 if (act
->sa_flags
& SA_ONSTACK
)
294 SIGADDSET(ps
->ps_sigonstack
, sig
);
296 SIGDELSET(ps
->ps_sigonstack
, sig
);
297 if (act
->sa_flags
& SA_RESETHAND
)
298 SIGADDSET(ps
->ps_sigreset
, sig
);
300 SIGDELSET(ps
->ps_sigreset
, sig
);
301 if (act
->sa_flags
& SA_NODEFER
)
302 SIGADDSET(ps
->ps_signodefer
, sig
);
304 SIGDELSET(ps
->ps_signodefer
, sig
);
305 if (act
->sa_flags
& SA_MAILBOX
)
306 SIGADDSET(ps
->ps_sigmailbox
, sig
);
308 SIGDELSET(ps
->ps_sigmailbox
, sig
);
309 if (sig
== SIGCHLD
) {
310 if (act
->sa_flags
& SA_NOCLDSTOP
)
311 p
->p_procsig
->ps_flag
|= PS_NOCLDSTOP
;
313 p
->p_procsig
->ps_flag
&= ~PS_NOCLDSTOP
;
314 if (act
->sa_flags
& SA_NOCLDWAIT
) {
316 * Paranoia: since SA_NOCLDWAIT is implemented
317 * by reparenting the dying child to PID 1 (and
318 * trust it to reap the zombie), PID 1 itself
319 * is forbidden to set SA_NOCLDWAIT.
322 p
->p_procsig
->ps_flag
&= ~PS_NOCLDWAIT
;
324 p
->p_procsig
->ps_flag
|= PS_NOCLDWAIT
;
326 p
->p_procsig
->ps_flag
&= ~PS_NOCLDWAIT
;
330 * Set bit in p_sigignore for signals that are set to SIG_IGN,
331 * and for signals set to SIG_DFL where the default is to
332 * ignore. However, don't put SIGCONT in p_sigignore, as we
333 * have to restart the process.
335 if (ps
->ps_sigact
[_SIG_IDX(sig
)] == SIG_IGN
||
336 (sigprop(sig
) & SA_IGNORE
&&
337 ps
->ps_sigact
[_SIG_IDX(sig
)] == SIG_DFL
)) {
338 /* never to be seen again */
339 SIGDELSET(p
->p_siglist
, sig
);
341 * Remove the signal also from the thread lists.
343 FOREACH_LWP_IN_PROC(lp
, p
) {
344 SIGDELSET(lp
->lwp_siglist
, sig
);
347 /* easier in ksignal */
348 SIGADDSET(p
->p_sigignore
, sig
);
349 SIGDELSET(p
->p_sigcatch
, sig
);
351 SIGDELSET(p
->p_sigignore
, sig
);
352 if (ps
->ps_sigact
[_SIG_IDX(sig
)] == SIG_DFL
)
353 SIGDELSET(p
->p_sigcatch
, sig
);
355 SIGADDSET(p
->p_sigcatch
, sig
);
364 sys_sigaction(struct sigaction_args
*uap
)
366 struct sigaction act
, oact
;
367 struct sigaction
*actp
, *oactp
;
370 actp
= (uap
->act
!= NULL
) ? &act
: NULL
;
371 oactp
= (uap
->oact
!= NULL
) ? &oact
: NULL
;
373 error
= copyin(uap
->act
, actp
, sizeof(act
));
377 error
= kern_sigaction(uap
->sig
, actp
, oactp
);
378 if (oactp
&& !error
) {
379 error
= copyout(oactp
, uap
->oact
, sizeof(oact
));
385 * Initialize signal state for process 0;
386 * set to ignore signals that are ignored by default.
389 siginit(struct proc
*p
)
393 for (i
= 1; i
<= NSIG
; i
++)
394 if (sigprop(i
) & SA_IGNORE
&& i
!= SIGCONT
)
395 SIGADDSET(p
->p_sigignore
, i
);
399 * Reset signals for an exec of the specified process.
402 execsigs(struct proc
*p
)
404 struct sigacts
*ps
= p
->p_sigacts
;
408 lp
= ONLY_LWP_IN_PROC(p
);
411 * Reset caught signals. Held signals remain held
412 * through p_sigmask (unless they were caught,
413 * and are now ignored by default).
415 while (SIGNOTEMPTY(p
->p_sigcatch
)) {
416 sig
= sig_ffs(&p
->p_sigcatch
);
417 SIGDELSET(p
->p_sigcatch
, sig
);
418 if (sigprop(sig
) & SA_IGNORE
) {
420 SIGADDSET(p
->p_sigignore
, sig
);
421 SIGDELSET(p
->p_siglist
, sig
);
422 SIGDELSET(lp
->lwp_siglist
, sig
);
424 ps
->ps_sigact
[_SIG_IDX(sig
)] = SIG_DFL
;
428 * Reset stack state to the user stack.
429 * Clear set of signals caught on the signal stack.
431 lp
->lwp_sigstk
.ss_flags
= SS_DISABLE
;
432 lp
->lwp_sigstk
.ss_size
= 0;
433 lp
->lwp_sigstk
.ss_sp
= 0;
434 lp
->lwp_flag
&= ~LWP_ALTSTACK
;
436 * Reset no zombies if child dies flag as Solaris does.
438 p
->p_procsig
->ps_flag
&= ~PS_NOCLDWAIT
;
442 * kern_sigprocmask() - MP SAFE ONLY IF p == curproc
444 * Manipulate signal mask. This routine is MP SAFE *ONLY* if
448 kern_sigprocmask(int how
, sigset_t
*set
, sigset_t
*oset
)
450 struct thread
*td
= curthread
;
451 struct lwp
*lp
= td
->td_lwp
;
455 *oset
= lp
->lwp_sigmask
;
462 SIGSETOR(lp
->lwp_sigmask
, *set
);
465 SIGSETNAND(lp
->lwp_sigmask
, *set
);
469 lp
->lwp_sigmask
= *set
;
480 * sigprocmask() - MP SAFE
483 sys_sigprocmask(struct sigprocmask_args
*uap
)
486 sigset_t
*setp
, *osetp
;
489 setp
= (uap
->set
!= NULL
) ? &set
: NULL
;
490 osetp
= (uap
->oset
!= NULL
) ? &oset
: NULL
;
492 error
= copyin(uap
->set
, setp
, sizeof(set
));
496 error
= kern_sigprocmask(uap
->how
, setp
, osetp
);
497 if (osetp
&& !error
) {
498 error
= copyout(osetp
, uap
->oset
, sizeof(oset
));
504 kern_sigpending(struct __sigset
*set
)
506 struct lwp
*lp
= curthread
->td_lwp
;
508 *set
= lwp_sigpend(lp
);
514 sys_sigpending(struct sigpending_args
*uap
)
519 error
= kern_sigpending(&set
);
522 error
= copyout(&set
, uap
->set
, sizeof(set
));
527 * Suspend process until signal, providing mask to be set
531 kern_sigsuspend(struct __sigset
*set
)
533 struct thread
*td
= curthread
;
534 struct lwp
*lp
= td
->td_lwp
;
535 struct proc
*p
= td
->td_proc
;
536 struct sigacts
*ps
= p
->p_sigacts
;
539 * When returning from sigsuspend, we want
540 * the old mask to be restored after the
541 * signal handler has finished. Thus, we
542 * save it here and mark the sigacts structure
545 lp
->lwp_oldsigmask
= lp
->lwp_sigmask
;
546 lp
->lwp_flag
|= LWP_OLDMASK
;
549 lp
->lwp_sigmask
= *set
;
550 while (tsleep(ps
, PCATCH
, "pause", 0) == 0)
552 /* always return EINTR rather than ERESTART... */
557 * Note nonstandard calling convention: libc stub passes mask, not
558 * pointer, to save a copyin.
561 sys_sigsuspend(struct sigsuspend_args
*uap
)
566 error
= copyin(uap
->sigmask
, &mask
, sizeof(mask
));
570 error
= kern_sigsuspend(&mask
);
576 kern_sigaltstack(struct sigaltstack
*ss
, struct sigaltstack
*oss
)
578 struct thread
*td
= curthread
;
579 struct lwp
*lp
= td
->td_lwp
;
580 struct proc
*p
= td
->td_proc
;
582 if ((lp
->lwp_flag
& LWP_ALTSTACK
) == 0)
583 lp
->lwp_sigstk
.ss_flags
|= SS_DISABLE
;
586 *oss
= lp
->lwp_sigstk
;
589 if (ss
->ss_flags
& SS_DISABLE
) {
590 if (lp
->lwp_sigstk
.ss_flags
& SS_ONSTACK
)
592 lp
->lwp_flag
&= ~LWP_ALTSTACK
;
593 lp
->lwp_sigstk
.ss_flags
= ss
->ss_flags
;
595 if (ss
->ss_size
< p
->p_sysent
->sv_minsigstksz
)
597 lp
->lwp_flag
|= LWP_ALTSTACK
;
598 lp
->lwp_sigstk
= *ss
;
606 sys_sigaltstack(struct sigaltstack_args
*uap
)
612 error
= copyin(uap
->ss
, &ss
, sizeof(ss
));
617 error
= kern_sigaltstack(uap
->ss
? &ss
: NULL
,
618 uap
->oss
? &oss
: NULL
);
620 if (error
== 0 && uap
->oss
)
621 error
= copyout(&oss
, uap
->oss
, sizeof(*uap
->oss
));
626 * Common code for kill process group/broadcast kill.
627 * cp is calling process.
634 static int killpg_all_callback(struct proc
*p
, void *data
);
637 dokillpg(int sig
, int pgid
, int all
)
639 struct killpg_info info
;
640 struct proc
*cp
= curproc
;
651 allproc_scan(killpg_all_callback
, &info
);
655 * zero pgid means send to my process group.
663 lockmgr(&pgrp
->pg_lock
, LK_EXCLUSIVE
);
664 LIST_FOREACH(p
, &pgrp
->pg_members
, p_pglist
) {
666 p
->p_stat
== SZOMB
||
667 (p
->p_flag
& P_SYSTEM
) ||
668 !CANSIGNAL(p
, sig
)) {
675 lockmgr(&pgrp
->pg_lock
, LK_RELEASE
);
677 return (info
.nfound
? 0 : ESRCH
);
681 killpg_all_callback(struct proc
*p
, void *data
)
683 struct killpg_info
*info
= data
;
685 if (p
->p_pid
<= 1 || (p
->p_flag
& P_SYSTEM
) ||
686 p
== curproc
|| !CANSIGNAL(p
, info
->sig
)) {
691 ksignal(p
, info
->sig
);
696 kern_kill(int sig
, int pid
)
698 struct thread
*td
= curthread
;
699 struct proc
*p
= td
->td_proc
;
701 if ((u_int
)sig
> _SIG_MAXSIG
)
704 /* kill single process */
705 if ((p
= pfind(pid
)) == NULL
)
707 if (!CANSIGNAL(p
, sig
))
714 case -1: /* broadcast signal */
715 return (dokillpg(sig
, 0, 1));
716 case 0: /* signal own process group */
717 return (dokillpg(sig
, 0, 0));
718 default: /* negative explicit process group */
719 return (dokillpg(sig
, -pid
, 0));
725 sys_kill(struct kill_args
*uap
)
729 error
= kern_kill(uap
->signum
, uap
->pid
);
735 * Send a signal to a process group.
738 gsignal(int pgid
, int sig
)
742 if (pgid
&& (pgrp
= pgfind(pgid
)))
743 pgsignal(pgrp
, sig
, 0);
747 * Send a signal to a process group. If checktty is 1,
748 * limit to members which have a controlling terminal.
750 * pg_lock interlocks against a fork that might be in progress, to
751 * ensure that the new child process picks up the signal.
754 pgsignal(struct pgrp
*pgrp
, int sig
, int checkctty
)
759 lockmgr(&pgrp
->pg_lock
, LK_EXCLUSIVE
);
760 LIST_FOREACH(p
, &pgrp
->pg_members
, p_pglist
) {
761 if (checkctty
== 0 || p
->p_flag
& P_CONTROLT
)
764 lockmgr(&pgrp
->pg_lock
, LK_RELEASE
);
769 * Send a signal caused by a trap to the current process.
770 * If it will be caught immediately, deliver it with correct code.
771 * Otherwise, post it normally.
774 trapsignal(struct lwp
*lp
, int sig
, u_long code
)
776 struct proc
*p
= lp
->lwp_proc
;
777 struct sigacts
*ps
= p
->p_sigacts
;
780 * If we are a virtual kernel running an emulated user process
781 * context, switch back to the virtual kernel context before
782 * trying to post the signal.
784 if (p
->p_vkernel
&& p
->p_vkernel
->vk_current
) {
785 struct trapframe
*tf
= curthread
->td_lwp
->lwp_md
.md_regs
;
791 if ((p
->p_flag
& P_TRACED
) == 0 && SIGISMEMBER(p
->p_sigcatch
, sig
) &&
792 !SIGISMEMBER(lp
->lwp_sigmask
, sig
)) {
793 lp
->lwp_ru
.ru_nsignals
++;
795 if (KTRPOINT(lp
->lwp_thread
, KTR_PSIG
))
796 ktrpsig(p
, sig
, ps
->ps_sigact
[_SIG_IDX(sig
)],
797 &lp
->lwp_sigmask
, code
);
799 (*p
->p_sysent
->sv_sendsig
)(ps
->ps_sigact
[_SIG_IDX(sig
)], sig
,
800 &lp
->lwp_sigmask
, code
);
801 SIGSETOR(lp
->lwp_sigmask
, ps
->ps_catchmask
[_SIG_IDX(sig
)]);
802 if (!SIGISMEMBER(ps
->ps_signodefer
, sig
))
803 SIGADDSET(lp
->lwp_sigmask
, sig
);
804 if (SIGISMEMBER(ps
->ps_sigreset
, sig
)) {
806 * See kern_sigaction() for origin of this code.
808 SIGDELSET(p
->p_sigcatch
, sig
);
809 if (sig
!= SIGCONT
&&
810 sigprop(sig
) & SA_IGNORE
)
811 SIGADDSET(p
->p_sigignore
, sig
);
812 ps
->ps_sigact
[_SIG_IDX(sig
)] = SIG_DFL
;
815 lp
->lwp_code
= code
; /* XXX for core dump/debugger */
816 lp
->lwp_sig
= sig
; /* XXX to verify code */
822 * Send the signal to the process. If the signal has an action, the action
823 * is usually performed by the target process rather than the caller; we add
824 * the signal to the set of pending signals for the process.
827 * o When a stop signal is sent to a sleeping process that takes the
828 * default action, the process is stopped without awakening it.
829 * o SIGCONT restarts stopped processes (or puts them back to sleep)
830 * regardless of the signal action (eg, blocked or ignored).
832 * Other ignored signals are discarded immediately.
835 ksignal(struct proc
*p
, int sig
)
837 /* XXX lwp more intelligent lwp choice needed */
838 struct lwp
*lp
= FIRST_LWP_IN_PROC(p
);
842 if (sig
> _SIG_MAXSIG
|| sig
<= 0) {
843 kprintf("ksignal: signal %d\n", sig
);
844 panic("ksignal signal number");
848 KNOTE(&p
->p_klist
, NOTE_SIGNAL
| sig
);
854 * If proc is traced, always give parent a chance;
855 * if signal event is tracked by procfs, give *that*
858 if ((p
->p_flag
& P_TRACED
) || (p
->p_stops
& S_SIG
)) {
862 * If the signal is being ignored,
863 * then we forget about it immediately.
864 * (Note: we don't set SIGCONT in p_sigignore,
865 * and if it is set to SIG_IGN,
866 * action will be SIG_DFL here.)
868 if (SIGISMEMBER(p
->p_sigignore
, sig
) || (p
->p_flag
& P_WEXIT
))
870 if (SIGISMEMBER(lp
->lwp_sigmask
, sig
))
872 else if (SIGISMEMBER(p
->p_sigcatch
, sig
))
878 if (p
->p_nice
> NZERO
&& action
== SIG_DFL
&& (prop
& SA_KILL
) &&
879 (p
->p_flag
& P_TRACED
) == 0) {
884 * If continuing, clear any pending STOP signals.
887 SIG_STOPSIGMASK(p
->p_siglist
);
889 if (prop
& SA_STOP
) {
891 * If sending a tty stop signal to a member of an orphaned
892 * process group, discard the signal here if the action
893 * is default; don't stop the process below if sleeping,
894 * and don't clear any pending SIGCONT.
896 if (prop
& SA_TTYSTOP
&& p
->p_pgrp
->pg_jobc
== 0 &&
900 SIG_CONTSIGMASK(p
->p_siglist
);
902 SIGADDSET(p
->p_siglist
, sig
);
905 * Defer further processing for signals which are held,
906 * except that stopped processes must be continued by SIGCONT.
908 if (action
== SIG_HOLD
) {
909 if ((prop
& SA_CONT
) == 0 || p
->p_stat
!= SSTOP
)
916 /* XXX lwp handle stop/continue */
919 * LWP is in tsleep and not stopped
921 if (lp
->lwp_stat
== LSSLEEP
&& p
->p_stat
!= SSTOP
) {
923 * If the process is sleeping uninterruptibly
924 * we can't interrupt the sleep... the signal will
925 * be noticed when the process returns through
926 * trap() or syscall().
928 if ((lp
->lwp_flag
& LWP_SINTR
) == 0)
932 * If the process is sleeping and traced, make it runnable
933 * so it can discover the signal in issignal() and stop
936 * If the process is stopped and traced, no further action
939 if (p
->p_flag
& P_TRACED
)
943 * If the process is sleeping and SA_CONT, and the signal
944 * mode is SIG_DFL, then make the process runnable.
946 * However, do *NOT* set LWP_BREAKTSLEEP. We do not want
947 * a SIGCONT to terminate an interruptable tsleep early
948 * and generate a spurious EINTR.
950 if ((prop
& SA_CONT
) && action
== SIG_DFL
) {
951 SIGDELSET(p
->p_siglist
, sig
);
956 * If the process is sleeping and receives a STOP signal,
957 * process immediately if possible. All other (caught or
958 * default) signals cause the process to run.
960 if (prop
& SA_STOP
) {
961 if (action
!= SIG_DFL
)
965 * If a child holding parent blocked, stopping
966 * could cause deadlock. Take no action at this
969 if (p
->p_flag
& P_PPWAIT
)
973 * Do not actually try to manipulate the process while
974 * it is sleeping, simply set SSTOP to indicate that
975 * lwps should stop as soon as they safely can.
977 SIGDELSET(p
->p_siglist
, sig
);
984 * Otherwise the signal can interrupt the sleep.
990 * Process is in tsleep and is stopped
992 if (lp
->lwp_stat
== LSSLEEP
&& p
->p_stat
== SSTOP
) {
994 * If the process is stopped and is being traced, then no
995 * further action is necessary.
997 if (p
->p_flag
& P_TRACED
)
1001 * If the process is stopped and receives a KILL signal,
1002 * make the process runnable.
1004 if (sig
== SIGKILL
) {
1010 * If the process is stopped and receives a CONT signal,
1011 * then try to make the process runnable again.
1013 if (prop
& SA_CONT
) {
1015 * If SIGCONT is default (or ignored), we continue the
1016 * process but don't leave the signal in p_siglist, as
1017 * it has no further action. If SIGCONT is held, we
1018 * continue the process and leave the signal in
1019 * p_siglist. If the process catches SIGCONT, let it
1020 * handle the signal itself.
1022 if (action
== SIG_DFL
)
1023 SIGDELSET(p
->p_siglist
, sig
);
1025 if (action
== SIG_CATCH
)
1031 * If the process is stopped and receives another STOP
1032 * signal, we do not need to stop it again. If we did
1033 * the shell could get confused.
1035 if (prop
& SA_STOP
) {
1036 SIGDELSET(p
->p_siglist
, sig
);
1041 * Otherwise the process is sleeping interruptably but
1042 * is stopped, just set the LWP_BREAKTSLEEP flag and take
1043 * no further action. The next runnable action will wake
1046 lp
->lwp_flag
|= LWP_BREAKTSLEEP
;
1051 * Otherwise the process is running
1053 * SRUN, SIDL, SZOMB do nothing with the signal,
1054 * other than kicking ourselves if we are running.
1055 * It will either never be noticed, or noticed very soon.
1057 * Note that p_thread may be NULL or may not be completely
1058 * initialized if the process is in the SIDL or SZOMB state.
1060 * For SMP we may have to forward the request to another cpu.
1061 * YYY the MP lock prevents the target process from moving
1062 * to another cpu, see kern/kern_switch.c
1064 * If the target thread is waiting on its message port,
1065 * wakeup the target thread so it can check (or ignore)
1066 * the new signal. YYY needs cleanup.
1068 if (lp
== lwkt_preempted_proc()) {
1070 } else if (lp
->lwp_stat
== LSRUN
) {
1071 struct thread
*td
= lp
->lwp_thread
;
1074 ("pid %d/%d NULL lwp_thread stat %d flags %08x/%08x",
1075 p
->p_pid
, lp
->lwp_tid
, lp
->lwp_stat
, p
->p_flag
, lp
->lwp_flag
));
1078 if (td
->td_gd
!= mycpu
)
1079 lwkt_send_ipiq(td
->td_gd
, signotify_remote
, lp
);
1082 if (td
->td_msgport
.mp_flags
& MSGPORTF_WAITING
)
1089 * Make runnable and break out of any tsleep as well.
1091 lp
->lwp_flag
|= LWP_BREAKTSLEEP
;
1101 * This function is called via an IPI. We will be in a critical section but
1102 * the MP lock will NOT be held. Also note that by the time the ipi message
1103 * gets to us the process 'p' (arg) may no longer be scheduled or even valid.
1106 signotify_remote(void *arg
)
1108 struct lwp
*lp
= arg
;
1110 if (lp
== lwkt_preempted_proc()) {
1113 struct thread
*td
= lp
->lwp_thread
;
1114 if (td
->td_msgport
.mp_flags
& MSGPORTF_WAITING
)
1122 proc_stop(struct proc
*p
, int notify
)
1126 p
->p_flag
&= ~P_WAITED
;
1129 (notify
&& (p
->p_pptr
->p_procsig
->ps_flag
& PS_NOCLDSTOP
) == 0))
1130 ksignal(p
->p_pptr
, SIGCHLD
);
1134 proc_unstop(struct proc
*p
)
1136 struct lwp
*lp
= FIRST_LWP_IN_PROC(p
); /* XXX lwp */
1138 p
->p_stat
= SACTIVE
;
1143 kern_sigtimedwait(sigset_t waitset
, siginfo_t
*info
, struct timespec
*timeout
)
1145 sigset_t savedmask
, set
;
1146 struct proc
*p
= curproc
;
1147 struct lwp
*lp
= curthread
->td_lwp
;
1148 int error
, sig
, hz
, timevalid
= 0;
1149 struct timespec rts
, ets
, ts
;
1154 SIG_CANTMASK(waitset
);
1155 savedmask
= lp
->lwp_sigmask
;
1158 if (timeout
->tv_sec
>= 0 && timeout
->tv_nsec
>= 0 &&
1159 timeout
->tv_nsec
< 1000000000) {
1161 getnanouptime(&rts
);
1163 timespecadd(&ets
, timeout
);
1168 set
= lwp_sigpend(lp
);
1169 SIGSETAND(set
, waitset
);
1170 if ((sig
= sig_ffs(&set
)) != 0) {
1171 SIGFILLSET(lp
->lwp_sigmask
);
1172 SIGDELSET(lp
->lwp_sigmask
, sig
);
1173 SIG_CANTMASK(lp
->lwp_sigmask
);
1176 * It may be a STOP signal, in the case, issignal
1177 * returns 0, because we may stop there, and new
1178 * signal can come in, we should restart if we got
1188 * Previous checking got nothing, and we retried but still
1189 * got nothing, we should return the error status.
1195 * POSIX says this must be checked after looking for pending
1203 getnanouptime(&rts
);
1204 if (timespeccmp(&rts
, &ets
, >=)) {
1209 timespecsub(&ts
, &rts
);
1210 TIMESPEC_TO_TIMEVAL(&tv
, &ts
);
1211 hz
= tvtohz_high(&tv
);
1215 lp
->lwp_sigmask
= savedmask
;
1216 SIGSETNAND(lp
->lwp_sigmask
, waitset
);
1217 error
= tsleep(&p
->p_sigacts
, PCATCH
, "sigwt", hz
);
1219 if (error
== ERESTART
) {
1220 /* can not restart a timeout wait. */
1222 } else if (error
== EAGAIN
) {
1223 /* will calculate timeout by ourself. */
1230 lp
->lwp_sigmask
= savedmask
;
1233 bzero(info
, sizeof(*info
));
1234 info
->si_signo
= sig
;
1235 lwp_delsig(lp
, sig
); /* take the signal! */
1244 sys_sigtimedwait(struct sigtimedwait_args
*uap
)
1247 struct timespec
*timeout
;
1253 error
= copyin(uap
->timeout
, &ts
, sizeof(ts
));
1260 error
= copyin(uap
->set
, &set
, sizeof(set
));
1263 error
= kern_sigtimedwait(set
, &info
, timeout
);
1267 error
= copyout(&info
, uap
->info
, sizeof(info
));
1268 /* Repost if we got an error. */
1270 ksignal(curproc
, info
.si_signo
);
1272 uap
->sysmsg_result
= info
.si_signo
;
1277 sys_sigwaitinfo(struct sigwaitinfo_args
*uap
)
1283 error
= copyin(uap
->set
, &set
, sizeof(set
));
1286 error
= kern_sigtimedwait(set
, &info
, NULL
);
1290 error
= copyout(&info
, uap
->info
, sizeof(info
));
1291 /* Repost if we got an error. */
1293 ksignal(curproc
, info
.si_signo
);
1295 uap
->sysmsg_result
= info
.si_signo
;
1300 * If the current process has received a signal that would interrupt a
1301 * system call, return EINTR or ERESTART as appropriate.
1304 iscaught(struct lwp
*lp
)
1306 struct proc
*p
= lp
->lwp_proc
;
1310 if ((sig
= CURSIG(lp
)) != 0) {
1311 if (SIGISMEMBER(p
->p_sigacts
->ps_sigintr
, sig
))
1316 return(EWOULDBLOCK
);
1320 * If the current process has received a signal (should be caught or cause
1321 * termination, should interrupt current syscall), return the signal number.
1322 * Stop signals with default action are processed immediately, then cleared;
1323 * they aren't returned. This is checked after each entry to the system for
1324 * a syscall or trap (though this can usually be done without calling issignal
1325 * by checking the pending signal masks in the CURSIG macro.) The normal call
1328 * This routine is called via CURSIG/__cursig and the MP lock might not be
1329 * held. Obtain the MP lock for the duration of the operation.
1331 * while (sig = CURSIG(curproc))
1335 issignal(struct lwp
*lp
)
1337 struct proc
*p
= lp
->lwp_proc
;
1343 int traced
= (p
->p_flag
& P_TRACED
) || (p
->p_stops
& S_SIG
);
1345 mask
= lwp_sigpend(lp
);
1346 SIGSETNAND(mask
, lp
->lwp_sigmask
);
1347 if (p
->p_flag
& P_PPWAIT
)
1348 SIG_STOPSIGMASK(mask
);
1349 if (!SIGNOTEMPTY(mask
)) { /* no signal to send */
1353 sig
= sig_ffs(&mask
);
1355 STOPEVENT(p
, S_SIG
, sig
);
1358 * We should see pending but ignored signals
1359 * only if P_TRACED was on when they were posted.
1361 if (SIGISMEMBER(p
->p_sigignore
, sig
) && (traced
== 0)) {
1362 lwp_delsig(lp
, sig
);
1365 if ((p
->p_flag
& P_TRACED
) && (p
->p_flag
& P_PPWAIT
) == 0) {
1367 * If traced, always stop, and stay stopped until
1368 * released by the parent.
1370 * NOTE: SSTOP may get cleared during the loop,
1371 * but we do not re-notify the parent if we have
1372 * to loop several times waiting for the parent
1373 * to let us continue.
1375 * XXX not sure if this is still true
1381 } while (!trace_req(p
) && (p
->p_flag
& P_TRACED
));
1384 * If parent wants us to take the signal,
1385 * then it will leave it in p->p_xstat;
1386 * otherwise we just look for signals again.
1388 lwp_delsig(lp
, sig
); /* clear old signal */
1394 * Put the new signal into p_siglist. If the
1395 * signal is being masked, look for other signals.
1397 /* XXX should run via ksignal? */
1398 SIGADDSET(p
->p_siglist
, sig
);
1399 if (SIGISMEMBER(lp
->lwp_sigmask
, sig
))
1403 * If the traced bit got turned off, go back up
1404 * to the top to rescan signals. This ensures
1405 * that p_sig* and ps_sigact are consistent.
1407 if ((p
->p_flag
& P_TRACED
) == 0)
1411 prop
= sigprop(sig
);
1414 * Decide whether the signal should be returned.
1415 * Return the signal's number, or fall through
1416 * to clear it from the pending mask.
1418 switch ((int)(intptr_t)p
->p_sigacts
->ps_sigact
[_SIG_IDX(sig
)]) {
1421 * Don't take default actions on system processes.
1423 if (p
->p_pid
<= 1) {
1426 * Are you sure you want to ignore SIGSEGV
1429 kprintf("Process (pid %lu) got signal %d\n",
1430 (u_long
)p
->p_pid
, sig
);
1432 break; /* == ignore */
1436 * Handle the in-kernel checkpoint action
1438 if (prop
& SA_CKPT
) {
1439 checkpoint_signal_handler(lp
);
1444 * If there is a pending stop signal to process
1445 * with default action, stop here,
1446 * then clear the signal. However,
1447 * if process is member of an orphaned
1448 * process group, ignore tty stop signals.
1450 if (prop
& SA_STOP
) {
1451 if (p
->p_flag
& P_TRACED
||
1452 (p
->p_pgrp
->pg_jobc
== 0 &&
1454 break; /* == ignore */
1457 while (p
->p_stat
== SSTOP
) {
1461 } else if (prop
& SA_IGNORE
) {
1463 * Except for SIGCONT, shouldn't get here.
1464 * Default action is to ignore; drop it.
1466 break; /* == ignore */
1476 * Masking above should prevent us ever trying
1477 * to take action on an ignored signal other
1478 * than SIGCONT, unless process is traced.
1480 if ((prop
& SA_CONT
) == 0 &&
1481 (p
->p_flag
& P_TRACED
) == 0)
1482 kprintf("issignal\n");
1483 break; /* == ignore */
1487 * This signal has an action, let
1488 * postsig() process it.
1493 lwp_delsig(lp
, sig
); /* take the signal! */
1499 * Take the action for the specified signal
1500 * from the current set of pending signals.
1505 struct lwp
*lp
= curthread
->td_lwp
;
1506 struct proc
*p
= lp
->lwp_proc
;
1507 struct sigacts
*ps
= p
->p_sigacts
;
1509 sigset_t returnmask
;
1512 KASSERT(sig
!= 0, ("postsig"));
1515 * If we are a virtual kernel running an emulated user process
1516 * context, switch back to the virtual kernel context before
1517 * trying to post the signal.
1519 if (p
->p_vkernel
&& p
->p_vkernel
->vk_current
) {
1520 struct trapframe
*tf
= curthread
->td_lwp
->lwp_md
.md_regs
;
1522 vkernel_trap(p
, tf
);
1525 lwp_delsig(lp
, sig
);
1526 action
= ps
->ps_sigact
[_SIG_IDX(sig
)];
1528 if (KTRPOINT(lp
->lwp_thread
, KTR_PSIG
))
1529 ktrpsig(p
, sig
, action
, lp
->lwp_flag
& LWP_OLDMASK
?
1530 &lp
->lwp_oldsigmask
: &lp
->lwp_sigmask
, 0);
1532 STOPEVENT(p
, S_SIG
, sig
);
1534 if (action
== SIG_DFL
) {
1536 * Default action, where the default is to kill
1537 * the process. (Other cases were ignored above.)
1543 * If we get here, the signal must be caught.
1545 KASSERT(action
!= SIG_IGN
&& !SIGISMEMBER(lp
->lwp_sigmask
, sig
),
1546 ("postsig action"));
1551 * Reset the signal handler if asked to
1553 if (SIGISMEMBER(ps
->ps_sigreset
, sig
)) {
1555 * See kern_sigaction() for origin of this code.
1557 SIGDELSET(p
->p_sigcatch
, sig
);
1558 if (sig
!= SIGCONT
&&
1559 sigprop(sig
) & SA_IGNORE
)
1560 SIGADDSET(p
->p_sigignore
, sig
);
1561 ps
->ps_sigact
[_SIG_IDX(sig
)] = SIG_DFL
;
1565 * Handle the mailbox case. Copyout to the appropriate
1566 * location but do not generate a signal frame. The system
1567 * call simply returns EINTR and the user is responsible for
1568 * polling the mailbox.
1570 if (SIGISMEMBER(ps
->ps_sigmailbox
, sig
)) {
1572 copyout(&sig_copy
, (void *)action
, sizeof(int));
1573 curproc
->p_flag
|= P_MAILBOX
;
1579 * Set the signal mask and calculate the mask to restore
1580 * when the signal function returns.
1582 * Special case: user has done a sigsuspend. Here the
1583 * current mask is not of interest, but rather the
1584 * mask from before the sigsuspend is what we want
1585 * restored after the signal processing is completed.
1587 if (lp
->lwp_flag
& LWP_OLDMASK
) {
1588 returnmask
= lp
->lwp_oldsigmask
;
1589 lp
->lwp_flag
&= ~LWP_OLDMASK
;
1591 returnmask
= lp
->lwp_sigmask
;
1594 SIGSETOR(lp
->lwp_sigmask
, ps
->ps_catchmask
[_SIG_IDX(sig
)]);
1595 if (!SIGISMEMBER(ps
->ps_signodefer
, sig
))
1596 SIGADDSET(lp
->lwp_sigmask
, sig
);
1599 lp
->lwp_ru
.ru_nsignals
++;
1600 if (lp
->lwp_sig
!= sig
) {
1603 code
= lp
->lwp_code
;
1607 (*p
->p_sysent
->sv_sendsig
)(action
, sig
, &returnmask
, code
);
1614 * Kill the current process for stated reason.
1617 killproc(struct proc
*p
, char *why
)
1619 log(LOG_ERR
, "pid %d (%s), uid %d, was killed: %s\n",
1620 p
->p_pid
, p
->p_comm
,
1621 p
->p_ucred
? p
->p_ucred
->cr_uid
: -1, why
);
1622 ksignal(p
, SIGKILL
);
1626 * Force the current process to exit with the specified signal, dumping core
1627 * if appropriate. We bypass the normal tests for masked and caught signals,
1628 * allowing unrecoverable failures to terminate the process without changing
1629 * signal state. Mark the accounting record with the signal termination.
1630 * If dumping core, save the signal number for the debugger. Calls exit and
1634 sigexit(struct proc
*p
, int sig
)
1636 struct lwp
*lp
= FIRST_LWP_IN_PROC(p
); /* XXX lwp */
1638 p
->p_acflag
|= AXSIG
;
1639 if (sigprop(sig
) & SA_CORE
) {
1642 * Log signals which would cause core dumps
1643 * (Log as LOG_INFO to appease those who don't want
1645 * XXX : Todo, as well as euid, write out ruid too
1647 if (coredump(lp
, sig
) == 0)
1649 if (kern_logsigexit
)
1651 "pid %d (%s), uid %d: exited on signal %d%s\n",
1652 p
->p_pid
, p
->p_comm
,
1653 p
->p_ucred
? p
->p_ucred
->cr_uid
: -1,
1655 sig
& WCOREFLAG
? " (core dumped)" : "");
1657 exit1(W_EXITCODE(0, sig
));
1661 static char corefilename
[MAXPATHLEN
+1] = {"%N.core"};
1662 SYSCTL_STRING(_kern
, OID_AUTO
, corefile
, CTLFLAG_RW
, corefilename
,
1663 sizeof(corefilename
), "process corefile name format string");
1666 * expand_name(name, uid, pid)
1667 * Expand the name described in corefilename, using name, uid, and pid.
1668 * corefilename is a kprintf-like string, with three format specifiers:
1669 * %N name of process ("name")
1670 * %P process id (pid)
1672 * For example, "%N.core" is the default; they can be disabled completely
1673 * by using "/dev/null", or all core files can be stored in "/cores/%U/%N-%P".
1674 * This is controlled by the sysctl variable kern.corefile (see above).
1678 expand_name(const char *name
, uid_t uid
, pid_t pid
)
1681 char buf
[11]; /* Buffer for pid/uid -- max 4B */
1683 char *format
= corefilename
;
1686 temp
= kmalloc(MAXPATHLEN
+ 1, M_TEMP
, M_NOWAIT
);
1689 namelen
= strlen(name
);
1690 for (i
= 0, n
= 0; n
< MAXPATHLEN
&& format
[i
]; i
++) {
1692 switch (format
[i
]) {
1693 case '%': /* Format character */
1695 switch (format
[i
]) {
1699 case 'N': /* process name */
1700 if ((n
+ namelen
) > MAXPATHLEN
) {
1701 log(LOG_ERR
, "pid %d (%s), uid (%u): Path `%s%s' is too long\n",
1702 pid
, name
, uid
, temp
, name
);
1703 kfree(temp
, M_TEMP
);
1706 memcpy(temp
+n
, name
, namelen
);
1709 case 'P': /* process id */
1710 l
= ksprintf(buf
, "%u", pid
);
1711 if ((n
+ l
) > MAXPATHLEN
) {
1712 log(LOG_ERR
, "pid %d (%s), uid (%u): Path `%s%s' is too long\n",
1713 pid
, name
, uid
, temp
, name
);
1714 kfree(temp
, M_TEMP
);
1717 memcpy(temp
+n
, buf
, l
);
1720 case 'U': /* user id */
1721 l
= ksprintf(buf
, "%u", uid
);
1722 if ((n
+ l
) > MAXPATHLEN
) {
1723 log(LOG_ERR
, "pid %d (%s), uid (%u): Path `%s%s' is too long\n",
1724 pid
, name
, uid
, temp
, name
);
1725 kfree(temp
, M_TEMP
);
1728 memcpy(temp
+n
, buf
, l
);
1732 log(LOG_ERR
, "Unknown format character %c in `%s'\n", format
[i
], format
);
1736 temp
[n
++] = format
[i
];
1744 * Dump a process' core. The main routine does some
1745 * policy checking, and creates the name of the coredump;
1746 * then it passes on a vnode and a size limit to the process-specific
1747 * coredump routine if there is one; if there _is not_ one, it returns
1748 * ENOSYS; otherwise it returns the error from the process-specific routine.
1750 * The parameter `lp' is the lwp which triggered the coredump.
1754 coredump(struct lwp
*lp
, int sig
)
1756 struct proc
*p
= lp
->lwp_proc
;
1758 struct ucred
*cred
= p
->p_ucred
;
1760 struct nlookupdata nd
;
1763 char *name
; /* name of corefile */
1766 STOPEVENT(p
, S_CORE
, 0);
1768 if (((sugid_coredump
== 0) && p
->p_flag
& P_SUGID
) || do_coredump
== 0)
1772 * Note that the bulk of limit checking is done after
1773 * the corefile is created. The exception is if the limit
1774 * for corefiles is 0, in which case we don't bother
1775 * creating the corefile at all. This layout means that
1776 * a corefile is truncated instead of not being created,
1777 * if it is larger than the limit.
1779 limit
= p
->p_rlimit
[RLIMIT_CORE
].rlim_cur
;
1783 name
= expand_name(p
->p_comm
, p
->p_ucred
->cr_uid
, p
->p_pid
);
1786 error
= nlookup_init(&nd
, name
, UIO_SYSSPACE
, NLC_LOCKVP
);
1788 error
= vn_open(&nd
, NULL
, O_CREAT
| FWRITE
| O_NOFOLLOW
, S_IRUSR
| S_IWUSR
);
1789 kfree(name
, M_TEMP
);
1795 nd
.nl_open_vp
= NULL
;
1799 lf
.l_whence
= SEEK_SET
;
1802 lf
.l_type
= F_WRLCK
;
1803 error
= VOP_ADVLOCK(vp
, (caddr_t
)p
, F_SETLK
, &lf
, 0);
1807 /* Don't dump to non-regular files or files with links. */
1808 if (vp
->v_type
!= VREG
||
1809 VOP_GETATTR(vp
, &vattr
) || vattr
.va_nlink
!= 1) {
1815 vn_lock(vp
, LK_EXCLUSIVE
| LK_RETRY
);
1817 VOP_SETATTR(vp
, &vattr
, cred
);
1818 p
->p_acflag
|= ACORE
;
1821 error
= p
->p_sysent
->sv_coredump
?
1822 p
->p_sysent
->sv_coredump(lp
, sig
, vp
, limit
) : ENOSYS
;
1825 lf
.l_type
= F_UNLCK
;
1826 VOP_ADVLOCK(vp
, (caddr_t
)p
, F_UNLCK
, &lf
, 0);
1828 error1
= vn_close(vp
, FWRITE
);
1835 * Nonexistent system call-- signal process (may want to handle it).
1836 * Flag error in case process won't see signal immediately (blocked or ignored).
1840 sys_nosys(struct nosys_args
*args
)
1842 ksignal(curproc
, SIGSYS
);
1847 * Send a SIGIO or SIGURG signal to a process or process group using
1848 * stored credentials rather than those of the current process.
1851 pgsigio(struct sigio
*sigio
, int sig
, int checkctty
)
1856 if (sigio
->sio_pgid
> 0) {
1857 if (CANSIGIO(sigio
->sio_ruid
, sigio
->sio_ucred
,
1859 ksignal(sigio
->sio_proc
, sig
);
1860 } else if (sigio
->sio_pgid
< 0) {
1863 lockmgr(&sigio
->sio_pgrp
->pg_lock
, LK_EXCLUSIVE
);
1864 LIST_FOREACH(p
, &sigio
->sio_pgrp
->pg_members
, p_pglist
) {
1865 if (CANSIGIO(sigio
->sio_ruid
, sigio
->sio_ucred
, p
) &&
1866 (checkctty
== 0 || (p
->p_flag
& P_CONTROLT
)))
1869 lockmgr(&sigio
->sio_pgrp
->pg_lock
, LK_RELEASE
);
1874 filt_sigattach(struct knote
*kn
)
1876 struct proc
*p
= curproc
;
1878 kn
->kn_ptr
.p_proc
= p
;
1879 kn
->kn_flags
|= EV_CLEAR
; /* automatically set */
1881 /* XXX lock the proc here while adding to the list? */
1882 SLIST_INSERT_HEAD(&p
->p_klist
, kn
, kn_selnext
);
1888 filt_sigdetach(struct knote
*kn
)
1890 struct proc
*p
= kn
->kn_ptr
.p_proc
;
1892 SLIST_REMOVE(&p
->p_klist
, kn
, knote
, kn_selnext
);
1896 * signal knotes are shared with proc knotes, so we apply a mask to
1897 * the hint in order to differentiate them from process hints. This
1898 * could be avoided by using a signal-specific knote list, but probably
1899 * isn't worth the trouble.
1902 filt_signal(struct knote
*kn
, long hint
)
1904 if (hint
& NOTE_SIGNAL
) {
1905 hint
&= ~NOTE_SIGNAL
;
1907 if (kn
->kn_id
== hint
)
1910 return (kn
->kn_data
!= 0);