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15637ed4 RG |
1 | /* |
2 | * Copyright (c) 1982, 1986, 1989, 1991 Regents of the University of California. | |
3 | * All rights reserved. | |
4 | * | |
5 | * Redistribution and use in source and binary forms, with or without | |
6 | * modification, are permitted provided that the following conditions | |
7 | * are met: | |
8 | * 1. Redistributions of source code must retain the above copyright | |
9 | * notice, this list of conditions and the following disclaimer. | |
10 | * 2. Redistributions in binary form must reproduce the above copyright | |
11 | * notice, this list of conditions and the following disclaimer in the | |
12 | * documentation and/or other materials provided with the distribution. | |
13 | * 3. All advertising materials mentioning features or use of this software | |
14 | * must display the following acknowledgement: | |
15 | * This product includes software developed by the University of | |
16 | * California, Berkeley and its contributors. | |
17 | * 4. Neither the name of the University nor the names of its contributors | |
18 | * may be used to endorse or promote products derived from this software | |
19 | * without specific prior written permission. | |
20 | * | |
21 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
31 | * SUCH DAMAGE. | |
32 | * | |
600f7f07 | 33 | * from: @(#)kern_sig.c 7.35 (Berkeley) 6/28/91 |
26560360 | 34 | * $Id: kern_sig.c,v 1.11 1994/05/05 18:44:13 csgr Exp $ |
15637ed4 RG |
35 | */ |
36 | ||
37 | #define SIGPROP /* include signal properties table */ | |
38 | #include "param.h" | |
39 | #include "signalvar.h" | |
40 | #include "resourcevar.h" | |
41 | #include "namei.h" | |
42 | #include "vnode.h" | |
ce723be2 CR |
43 | #include "mount.h" |
44 | #include "filedesc.h" | |
15637ed4 | 45 | #include "proc.h" |
1523a604 | 46 | #include "ucred.h" |
15637ed4 RG |
47 | #include "systm.h" |
48 | #include "timeb.h" | |
49 | #include "times.h" | |
50 | #include "buf.h" | |
51 | #include "acct.h" | |
52 | #include "file.h" | |
53 | #include "kernel.h" | |
54 | #include "wait.h" | |
55 | #include "ktrace.h" | |
1523a604 | 56 | #include "syslog.h" |
15637ed4 RG |
57 | |
58 | #include "machine/cpu.h" | |
59 | ||
60 | #include "vm/vm.h" | |
61 | #include "kinfo_proc.h" | |
62 | #include "user.h" /* for coredump */ | |
63 | ||
4c45483e GW |
64 | static void setsigvec(struct proc *, int, struct sigaction *); |
65 | static void stop(struct proc *); | |
66 | static void sigexit(struct proc *, int); | |
fde1aeb2 | 67 | static int killpg1(struct proc *, int, int, int); |
4c45483e | 68 | |
15637ed4 RG |
69 | /* |
70 | * Can process p, with pcred pc, send the signal signo to process q? | |
71 | */ | |
72 | #define CANSIGNAL(p, pc, q, signo) \ | |
73 | ((pc)->pc_ucred->cr_uid == 0 || \ | |
74 | (pc)->p_ruid == (q)->p_cred->p_ruid || \ | |
75 | (pc)->pc_ucred->cr_uid == (q)->p_cred->p_ruid || \ | |
76 | (pc)->p_ruid == (q)->p_ucred->cr_uid || \ | |
77 | (pc)->pc_ucred->cr_uid == (q)->p_ucred->cr_uid || \ | |
78 | ((signo) == SIGCONT && (q)->p_session == (p)->p_session)) | |
79 | ||
3c7eb27c DG |
80 | struct sigaction_args { |
81 | int signo; | |
82 | struct sigaction *nsa; | |
83 | struct sigaction *osa; | |
84 | }; | |
85 | ||
15637ed4 | 86 | /* ARGSUSED */ |
4c45483e | 87 | int |
15637ed4 RG |
88 | sigaction(p, uap, retval) |
89 | struct proc *p; | |
3c7eb27c | 90 | register struct sigaction_args *uap; |
15637ed4 RG |
91 | int *retval; |
92 | { | |
93 | struct sigaction vec; | |
94 | register struct sigaction *sa; | |
95 | register struct sigacts *ps = p->p_sigacts; | |
96 | register int sig; | |
97 | int bit, error; | |
98 | ||
99 | sig = uap->signo; | |
100 | if (sig <= 0 || sig >= NSIG || sig == SIGKILL || sig == SIGSTOP) | |
101 | return (EINVAL); | |
102 | sa = &vec; | |
103 | if (uap->osa) { | |
104 | sa->sa_handler = ps->ps_sigact[sig]; | |
105 | sa->sa_mask = ps->ps_catchmask[sig]; | |
106 | bit = sigmask(sig); | |
107 | sa->sa_flags = 0; | |
108 | if ((ps->ps_sigonstack & bit) != 0) | |
109 | sa->sa_flags |= SA_ONSTACK; | |
110 | if ((ps->ps_sigintr & bit) == 0) | |
111 | sa->sa_flags |= SA_RESTART; | |
112 | if (p->p_flag & SNOCLDSTOP) | |
113 | sa->sa_flags |= SA_NOCLDSTOP; | |
114 | if (error = copyout((caddr_t)sa, (caddr_t)uap->osa, | |
115 | sizeof (vec))) | |
116 | return (error); | |
117 | } | |
118 | if (uap->nsa) { | |
119 | if (error = copyin((caddr_t)uap->nsa, (caddr_t)sa, | |
120 | sizeof (vec))) | |
121 | return (error); | |
122 | setsigvec(p, sig, sa); | |
123 | } | |
124 | return (0); | |
125 | } | |
126 | ||
4c45483e | 127 | void |
15637ed4 RG |
128 | setsigvec(p, sig, sa) |
129 | register struct proc *p; | |
130 | int sig; | |
131 | register struct sigaction *sa; | |
132 | { | |
133 | register struct sigacts *ps = p->p_sigacts; | |
134 | register int bit; | |
135 | ||
136 | bit = sigmask(sig); | |
137 | /* | |
138 | * Change setting atomically. | |
139 | */ | |
140 | (void) splhigh(); | |
141 | ps->ps_sigact[sig] = sa->sa_handler; | |
142 | ps->ps_catchmask[sig] = sa->sa_mask &~ sigcantmask; | |
143 | if ((sa->sa_flags & SA_RESTART) == 0) | |
144 | ps->ps_sigintr |= bit; | |
145 | else | |
146 | ps->ps_sigintr &= ~bit; | |
147 | if (sa->sa_flags & SA_ONSTACK) | |
148 | ps->ps_sigonstack |= bit; | |
149 | else | |
150 | ps->ps_sigonstack &= ~bit; | |
151 | if (sig == SIGCHLD) { | |
152 | if (sa->sa_flags & SA_NOCLDSTOP) | |
153 | p->p_flag |= SNOCLDSTOP; | |
154 | else | |
155 | p->p_flag &= ~SNOCLDSTOP; | |
156 | } | |
157 | /* | |
158 | * Set bit in p_sigignore for signals that are set to SIG_IGN, | |
159 | * and for signals set to SIG_DFL where the default is to ignore. | |
160 | * However, don't put SIGCONT in p_sigignore, | |
161 | * as we have to restart the process. | |
162 | */ | |
163 | if (sa->sa_handler == SIG_IGN || | |
164 | (sigprop[sig] & SA_IGNORE && sa->sa_handler == SIG_DFL)) { | |
165 | p->p_sig &= ~bit; /* never to be seen again */ | |
166 | if (sig != SIGCONT) | |
167 | p->p_sigignore |= bit; /* easier in psignal */ | |
168 | p->p_sigcatch &= ~bit; | |
169 | } else { | |
170 | p->p_sigignore &= ~bit; | |
171 | if (sa->sa_handler == SIG_DFL) | |
172 | p->p_sigcatch &= ~bit; | |
173 | else | |
174 | p->p_sigcatch |= bit; | |
175 | } | |
176 | (void) spl0(); | |
177 | } | |
178 | ||
179 | /* | |
180 | * Initialize signal state for process 0; | |
181 | * set to ignore signals that are ignored by default. | |
182 | */ | |
183 | void | |
184 | siginit(p) | |
185 | struct proc *p; | |
186 | { | |
187 | register int i; | |
188 | ||
189 | for (i = 0; i < NSIG; i++) | |
190 | if (sigprop[i] & SA_IGNORE && i != SIGCONT) | |
191 | p->p_sigignore |= sigmask(i); | |
192 | } | |
193 | ||
194 | /* | |
195 | * Reset signals for an exec of the specified process. | |
196 | */ | |
197 | void | |
198 | execsigs(p) | |
199 | register struct proc *p; | |
200 | { | |
201 | register struct sigacts *ps = p->p_sigacts; | |
202 | register int nc, mask; | |
203 | ||
204 | /* | |
205 | * Reset caught signals. Held signals remain held | |
206 | * through p_sigmask (unless they were caught, | |
207 | * and are now ignored by default). | |
208 | */ | |
209 | while (p->p_sigcatch) { | |
210 | nc = ffs((long)p->p_sigcatch); | |
211 | mask = sigmask(nc); | |
212 | p->p_sigcatch &= ~mask; | |
213 | if (sigprop[nc] & SA_IGNORE) { | |
214 | if (nc != SIGCONT) | |
215 | p->p_sigignore |= mask; | |
216 | p->p_sig &= ~mask; | |
217 | } | |
218 | ps->ps_sigact[nc] = SIG_DFL; | |
219 | } | |
220 | /* | |
221 | * Reset stack state to the user stack. | |
222 | * Clear set of signals caught on the signal stack. | |
223 | */ | |
224 | ps->ps_onstack = 0; | |
225 | ps->ps_sigsp = 0; | |
226 | ps->ps_sigonstack = 0; | |
227 | } | |
228 | ||
229 | /* | |
230 | * Manipulate signal mask. | |
231 | * Note that we receive new mask, not pointer, | |
232 | * and return old mask as return value; | |
233 | * the library stub does the rest. | |
234 | */ | |
3c7eb27c DG |
235 | |
236 | struct sigprocmask_args { | |
237 | int how; | |
238 | sigset_t mask; | |
239 | }; | |
240 | ||
4c45483e | 241 | int |
15637ed4 RG |
242 | sigprocmask(p, uap, retval) |
243 | register struct proc *p; | |
3c7eb27c | 244 | struct sigprocmask_args *uap; |
15637ed4 RG |
245 | int *retval; |
246 | { | |
247 | int error = 0; | |
248 | ||
249 | *retval = p->p_sigmask; | |
250 | (void) splhigh(); | |
251 | ||
252 | switch (uap->how) { | |
253 | case SIG_BLOCK: | |
254 | p->p_sigmask |= uap->mask &~ sigcantmask; | |
255 | break; | |
256 | ||
257 | case SIG_UNBLOCK: | |
258 | p->p_sigmask &= ~uap->mask; | |
259 | break; | |
260 | ||
261 | case SIG_SETMASK: | |
262 | p->p_sigmask = uap->mask &~ sigcantmask; | |
263 | break; | |
264 | ||
265 | default: | |
266 | error = EINVAL; | |
267 | break; | |
268 | } | |
269 | (void) spl0(); | |
270 | return (error); | |
271 | } | |
272 | ||
273 | /* ARGSUSED */ | |
4c45483e | 274 | int |
15637ed4 RG |
275 | sigpending(p, uap, retval) |
276 | struct proc *p; | |
277 | void *uap; | |
278 | int *retval; | |
279 | { | |
280 | ||
281 | *retval = p->p_sig; | |
282 | return (0); | |
283 | } | |
284 | ||
285 | #ifdef COMPAT_43 | |
286 | /* | |
287 | * Generalized interface signal handler, 4.3-compatible. | |
288 | */ | |
3c7eb27c DG |
289 | |
290 | struct osigvec_args { | |
291 | int signo; | |
292 | struct sigvec *nsv; | |
293 | struct sigvec *osv; | |
294 | }; | |
295 | ||
15637ed4 | 296 | /* ARGSUSED */ |
4c45483e | 297 | int |
15637ed4 RG |
298 | osigvec(p, uap, retval) |
299 | struct proc *p; | |
3c7eb27c | 300 | register struct osigvec_args *uap; |
15637ed4 RG |
301 | int *retval; |
302 | { | |
303 | struct sigvec vec; | |
304 | register struct sigacts *ps = p->p_sigacts; | |
305 | register struct sigvec *sv; | |
306 | register int sig; | |
307 | int bit, error; | |
308 | ||
309 | sig = uap->signo; | |
310 | if (sig <= 0 || sig >= NSIG || sig == SIGKILL || sig == SIGSTOP) | |
311 | return (EINVAL); | |
312 | sv = &vec; | |
313 | if (uap->osv) { | |
314 | *(sig_t *)&sv->sv_handler = ps->ps_sigact[sig]; | |
315 | sv->sv_mask = ps->ps_catchmask[sig]; | |
316 | bit = sigmask(sig); | |
317 | sv->sv_flags = 0; | |
318 | if ((ps->ps_sigonstack & bit) != 0) | |
319 | sv->sv_flags |= SV_ONSTACK; | |
320 | if ((ps->ps_sigintr & bit) != 0) | |
321 | sv->sv_flags |= SV_INTERRUPT; | |
322 | if (p->p_flag & SNOCLDSTOP) | |
323 | sv->sv_flags |= SA_NOCLDSTOP; | |
324 | if (error = copyout((caddr_t)sv, (caddr_t)uap->osv, | |
325 | sizeof (vec))) | |
326 | return (error); | |
327 | } | |
328 | if (uap->nsv) { | |
329 | if (error = copyin((caddr_t)uap->nsv, (caddr_t)sv, | |
330 | sizeof (vec))) | |
331 | return (error); | |
332 | sv->sv_flags ^= SA_RESTART; /* opposite of SV_INTERRUPT */ | |
333 | setsigvec(p, sig, (struct sigaction *)sv); | |
334 | } | |
335 | return (0); | |
336 | } | |
337 | ||
3c7eb27c DG |
338 | struct osigblock_args { |
339 | int mask; | |
340 | }; | |
341 | ||
4c45483e | 342 | int |
15637ed4 RG |
343 | osigblock(p, uap, retval) |
344 | register struct proc *p; | |
3c7eb27c | 345 | struct osigblock_args *uap; |
15637ed4 RG |
346 | int *retval; |
347 | { | |
348 | ||
349 | (void) splhigh(); | |
350 | *retval = p->p_sigmask; | |
351 | p->p_sigmask |= uap->mask &~ sigcantmask; | |
352 | (void) spl0(); | |
353 | return (0); | |
354 | } | |
355 | ||
3c7eb27c DG |
356 | struct osigsetmask_args { |
357 | int mask; | |
358 | }; | |
359 | ||
4c45483e | 360 | int |
15637ed4 RG |
361 | osigsetmask(p, uap, retval) |
362 | struct proc *p; | |
3c7eb27c | 363 | struct osigsetmask_args *uap; |
15637ed4 RG |
364 | int *retval; |
365 | { | |
366 | ||
367 | (void) splhigh(); | |
368 | *retval = p->p_sigmask; | |
369 | p->p_sigmask = uap->mask &~ sigcantmask; | |
370 | (void) spl0(); | |
371 | return (0); | |
372 | } | |
373 | #endif | |
374 | ||
375 | /* | |
376 | * Suspend process until signal, providing mask to be set | |
377 | * in the meantime. Note nonstandard calling convention: | |
378 | * libc stub passes mask, not pointer, to save a copyin. | |
379 | */ | |
3c7eb27c DG |
380 | |
381 | struct sigsuspend_args { | |
382 | sigset_t mask; | |
383 | }; | |
384 | ||
15637ed4 | 385 | /* ARGSUSED */ |
4c45483e | 386 | int |
15637ed4 RG |
387 | sigsuspend(p, uap, retval) |
388 | register struct proc *p; | |
3c7eb27c | 389 | struct sigsuspend_args *uap; |
15637ed4 RG |
390 | int *retval; |
391 | { | |
392 | register struct sigacts *ps = p->p_sigacts; | |
393 | ||
394 | /* | |
395 | * When returning from sigpause, we want | |
396 | * the old mask to be restored after the | |
397 | * signal handler has finished. Thus, we | |
398 | * save it here and mark the proc structure | |
399 | * to indicate this (should be in sigacts). | |
400 | */ | |
401 | ps->ps_oldmask = p->p_sigmask; | |
402 | ps->ps_flags |= SA_OLDMASK; | |
403 | p->p_sigmask = uap->mask &~ sigcantmask; | |
404 | (void) tsleep((caddr_t) ps, PPAUSE|PCATCH, "pause", 0); | |
405 | /* always return EINTR rather than ERESTART... */ | |
406 | return (EINTR); | |
407 | } | |
408 | ||
3c7eb27c DG |
409 | struct sigstack_args { |
410 | struct sigstack *nss; | |
411 | struct sigstack *oss; | |
412 | }; | |
413 | ||
15637ed4 | 414 | /* ARGSUSED */ |
4c45483e | 415 | int |
15637ed4 RG |
416 | sigstack(p, uap, retval) |
417 | struct proc *p; | |
3c7eb27c | 418 | register struct sigstack_args *uap; |
15637ed4 RG |
419 | int *retval; |
420 | { | |
421 | struct sigstack ss; | |
422 | int error = 0; | |
423 | ||
424 | if (uap->oss && (error = copyout((caddr_t)&p->p_sigacts->ps_sigstack, | |
425 | (caddr_t)uap->oss, sizeof (struct sigstack)))) | |
426 | return (error); | |
427 | if (uap->nss && (error = copyin((caddr_t)uap->nss, (caddr_t)&ss, | |
428 | sizeof (ss))) == 0) | |
429 | p->p_sigacts->ps_sigstack = ss; | |
430 | return (error); | |
431 | } | |
432 | ||
3c7eb27c DG |
433 | struct kill_args { |
434 | int pid; | |
435 | int signo; | |
436 | }; | |
437 | ||
15637ed4 | 438 | /* ARGSUSED */ |
4c45483e | 439 | int |
15637ed4 RG |
440 | kill(cp, uap, retval) |
441 | register struct proc *cp; | |
3c7eb27c | 442 | register struct kill_args *uap; |
15637ed4 RG |
443 | int *retval; |
444 | { | |
445 | register struct proc *p; | |
446 | register struct pcred *pc = cp->p_cred; | |
447 | ||
448 | if ((unsigned) uap->signo >= NSIG) | |
449 | return (EINVAL); | |
450 | if (uap->pid > 0) { | |
451 | /* kill single process */ | |
452 | p = pfind(uap->pid); | |
453 | if (p == 0) | |
454 | return (ESRCH); | |
455 | if (!CANSIGNAL(cp, pc, p, uap->signo)) | |
456 | return (EPERM); | |
457 | if (uap->signo) | |
458 | psignal(p, uap->signo); | |
459 | return (0); | |
460 | } | |
461 | switch (uap->pid) { | |
462 | case -1: /* broadcast signal */ | |
463 | return (killpg1(cp, uap->signo, 0, 1)); | |
464 | case 0: /* signal own process group */ | |
465 | return (killpg1(cp, uap->signo, 0, 0)); | |
466 | default: /* negative explicit process group */ | |
467 | return (killpg1(cp, uap->signo, -uap->pid, 0)); | |
468 | } | |
469 | /* NOTREACHED */ | |
470 | } | |
471 | ||
472 | #ifdef COMPAT_43 | |
3c7eb27c DG |
473 | |
474 | struct okillpg_args { | |
475 | int pgid; | |
476 | int signo; | |
477 | }; | |
478 | ||
15637ed4 | 479 | /* ARGSUSED */ |
4c45483e | 480 | int |
15637ed4 RG |
481 | okillpg(p, uap, retval) |
482 | struct proc *p; | |
3c7eb27c | 483 | register struct okillpg_args *uap; |
15637ed4 RG |
484 | int *retval; |
485 | { | |
486 | ||
487 | if ((unsigned) uap->signo >= NSIG) | |
488 | return (EINVAL); | |
489 | return (killpg1(p, uap->signo, uap->pgid, 0)); | |
490 | } | |
491 | #endif | |
492 | ||
493 | /* | |
494 | * Common code for kill process group/broadcast kill. | |
495 | * cp is calling process. | |
496 | */ | |
fde1aeb2 | 497 | static int |
15637ed4 RG |
498 | killpg1(cp, signo, pgid, all) |
499 | register struct proc *cp; | |
500 | int signo, pgid, all; | |
501 | { | |
502 | register struct proc *p; | |
503 | register struct pcred *pc = cp->p_cred; | |
504 | struct pgrp *pgrp; | |
505 | int nfound = 0; | |
506 | ||
507 | if (all) | |
508 | /* | |
509 | * broadcast | |
510 | */ | |
511 | for (p = allproc; p != NULL; p = p->p_nxt) { | |
512 | if (p->p_pid <= 1 || p->p_flag&SSYS || | |
513 | p == cp || !CANSIGNAL(cp, pc, p, signo)) | |
514 | continue; | |
515 | nfound++; | |
516 | if (signo) | |
517 | psignal(p, signo); | |
518 | } | |
519 | else { | |
520 | if (pgid == 0) | |
521 | /* | |
522 | * zero pgid means send to my process group. | |
523 | */ | |
524 | pgrp = cp->p_pgrp; | |
525 | else { | |
526 | pgrp = pgfind(pgid); | |
527 | if (pgrp == NULL) | |
528 | return (ESRCH); | |
529 | } | |
530 | for (p = pgrp->pg_mem; p != NULL; p = p->p_pgrpnxt) { | |
531 | if (p->p_pid <= 1 || p->p_flag&SSYS || | |
532 | p->p_stat == SZOMB || !CANSIGNAL(cp, pc, p, signo)) | |
533 | continue; | |
534 | nfound++; | |
535 | if (signo) | |
536 | psignal(p, signo); | |
537 | } | |
538 | } | |
539 | return (nfound ? 0 : ESRCH); | |
540 | } | |
541 | ||
542 | /* | |
543 | * Send the specified signal to | |
544 | * all processes with 'pgid' as | |
545 | * process group. | |
546 | */ | |
547 | void | |
548 | gsignal(pgid, sig) | |
549 | int pgid, sig; | |
550 | { | |
551 | struct pgrp *pgrp; | |
552 | ||
553 | if (pgid && (pgrp = pgfind(pgid))) | |
554 | pgsignal(pgrp, sig, 0); | |
555 | } | |
556 | ||
557 | /* | |
558 | * Send sig to every member of a process group. | |
559 | * If checktty is 1, limit to members which have a controlling | |
560 | * terminal. | |
561 | */ | |
562 | void | |
563 | pgsignal(pgrp, sig, checkctty) | |
564 | struct pgrp *pgrp; | |
565 | int sig, checkctty; | |
566 | { | |
567 | register struct proc *p; | |
568 | ||
569 | if (pgrp) | |
570 | for (p = pgrp->pg_mem; p != NULL; p = p->p_pgrpnxt) | |
571 | if (checkctty == 0 || p->p_flag&SCTTY) | |
572 | psignal(p, sig); | |
573 | } | |
574 | ||
575 | /* | |
576 | * Send a signal caused by a trap to the current process. | |
577 | * If it will be caught immediately, deliver it with correct code. | |
578 | * Otherwise, post it normally. | |
579 | */ | |
580 | void | |
581 | trapsignal(p, sig, code) | |
582 | struct proc *p; | |
583 | register int sig; | |
584 | unsigned code; | |
585 | { | |
586 | register struct sigacts *ps = p->p_sigacts; | |
587 | int mask; | |
588 | ||
589 | mask = sigmask(sig); | |
590 | if (p == curproc && (p->p_flag & STRC) == 0 && | |
591 | (p->p_sigcatch & mask) != 0 && (p->p_sigmask & mask) == 0) { | |
592 | p->p_stats->p_ru.ru_nsignals++; | |
593 | #ifdef KTRACE | |
594 | if (KTRPOINT(p, KTR_PSIG)) | |
595 | ktrpsig(p->p_tracep, sig, ps->ps_sigact[sig], | |
596 | p->p_sigmask, code); | |
597 | #endif | |
598 | sendsig(ps->ps_sigact[sig], sig, p->p_sigmask, code); | |
599 | p->p_sigmask |= ps->ps_catchmask[sig] | mask; | |
600 | } else { | |
601 | ps->ps_code = code; /* XXX for core dump/debugger */ | |
602 | psignal(p, sig); | |
603 | } | |
604 | } | |
605 | ||
606 | /* | |
607 | * Send the specified signal to the specified process. | |
608 | * If the signal has an action, the action is usually performed | |
609 | * by the target process rather than the caller; we simply add | |
610 | * the signal to the set of pending signals for the process. | |
611 | * Exceptions: | |
612 | * o When a stop signal is sent to a sleeping process that takes the default | |
613 | * action, the process is stopped without awakening it. | |
614 | * o SIGCONT restarts stopped processes (or puts them back to sleep) | |
615 | * regardless of the signal action (eg, blocked or ignored). | |
616 | * Other ignored signals are discarded immediately. | |
617 | */ | |
618 | void | |
619 | psignal(p, sig) | |
620 | register struct proc *p; | |
621 | register int sig; | |
622 | { | |
623 | register int s, prop; | |
624 | register sig_t action; | |
625 | int mask; | |
626 | ||
58167ae3 DG |
627 | /* Ignore signals to system (internal) daemons */ |
628 | if (p->p_flag & SSYS) | |
629 | return; | |
630 | ||
15637ed4 RG |
631 | if ((unsigned)sig >= NSIG || sig == 0) |
632 | panic("psignal sig"); | |
633 | mask = sigmask(sig); | |
634 | prop = sigprop[sig]; | |
635 | ||
636 | /* | |
637 | * If proc is traced, always give parent a chance. | |
638 | */ | |
639 | if (p->p_flag & STRC) | |
640 | action = SIG_DFL; | |
641 | else { | |
642 | /* | |
643 | * If the signal is being ignored, | |
644 | * then we forget about it immediately. | |
645 | * (Note: we don't set SIGCONT in p_sigignore, | |
646 | * and if it is set to SIG_IGN, | |
647 | * action will be SIG_DFL here.) | |
648 | */ | |
649 | if (p->p_sigignore & mask) | |
650 | return; | |
651 | if (p->p_sigmask & mask) | |
652 | action = SIG_HOLD; | |
653 | else if (p->p_sigcatch & mask) | |
654 | action = SIG_CATCH; | |
655 | else | |
656 | action = SIG_DFL; | |
657 | } | |
658 | ||
659 | if (p->p_nice > NZERO && (sig == SIGKILL || | |
660 | sig == SIGTERM && (p->p_flag&STRC || action != SIG_DFL))) | |
661 | p->p_nice = NZERO; | |
662 | ||
663 | if (prop & SA_CONT) | |
664 | p->p_sig &= ~stopsigmask; | |
665 | ||
666 | if (prop & SA_STOP) { | |
667 | /* | |
668 | * If sending a tty stop signal to a member of an orphaned | |
669 | * process group, discard the signal here if the action | |
670 | * is default; don't stop the process below if sleeping, | |
671 | * and don't clear any pending SIGCONT. | |
672 | */ | |
673 | if (prop & SA_TTYSTOP && p->p_pgrp->pg_jobc == 0 && | |
674 | action == SIG_DFL) | |
675 | return; | |
676 | p->p_sig &= ~contsigmask; | |
677 | } | |
678 | p->p_sig |= mask; | |
679 | ||
680 | /* | |
681 | * Defer further processing for signals which are held, | |
682 | * except that stopped processes must be continued by SIGCONT. | |
683 | */ | |
684 | if (action == SIG_HOLD && ((prop & SA_CONT) == 0 || p->p_stat != SSTOP)) | |
685 | return; | |
686 | s = splhigh(); | |
687 | switch (p->p_stat) { | |
688 | ||
689 | case SSLEEP: | |
690 | /* | |
691 | * If process is sleeping uninterruptibly | |
692 | * we can't interrupt the sleep... the signal will | |
693 | * be noticed when the process returns through | |
694 | * trap() or syscall(). | |
695 | */ | |
696 | if ((p->p_flag & SSINTR) == 0) | |
697 | goto out; | |
698 | /* | |
699 | * Process is sleeping and traced... make it runnable | |
700 | * so it can discover the signal in issig() and stop | |
701 | * for the parent. | |
702 | */ | |
703 | if (p->p_flag&STRC) | |
704 | goto run; | |
705 | /* | |
706 | * When a sleeping process receives a stop | |
707 | * signal, process immediately if possible. | |
708 | * All other (caught or default) signals | |
709 | * cause the process to run. | |
710 | */ | |
711 | if (prop & SA_STOP) { | |
712 | if (action != SIG_DFL) | |
713 | goto runfast; | |
714 | /* | |
715 | * If a child holding parent blocked, | |
716 | * stopping could cause deadlock. | |
717 | */ | |
718 | if (p->p_flag&SPPWAIT) | |
719 | goto out; | |
720 | p->p_sig &= ~mask; | |
721 | p->p_xstat = sig; | |
722 | if ((p->p_pptr->p_flag & SNOCLDSTOP) == 0) | |
723 | psignal(p->p_pptr, SIGCHLD); | |
724 | stop(p); | |
725 | goto out; | |
726 | } else | |
727 | goto runfast; | |
728 | /*NOTREACHED*/ | |
729 | ||
730 | case SSTOP: | |
731 | /* | |
732 | * If traced process is already stopped, | |
733 | * then no further action is necessary. | |
734 | */ | |
735 | if (p->p_flag&STRC) | |
736 | goto out; | |
737 | ||
738 | /* | |
739 | * Kill signal always sets processes running. | |
740 | */ | |
741 | if (sig == SIGKILL) | |
742 | goto runfast; | |
743 | ||
744 | if (prop & SA_CONT) { | |
745 | /* | |
746 | * If SIGCONT is default (or ignored), we continue | |
747 | * the process but don't leave the signal in p_sig, | |
748 | * as it has no further action. If SIGCONT is held, | |
749 | * continue the process and leave the signal in p_sig. | |
750 | * If the process catches SIGCONT, let it handle | |
751 | * the signal itself. If it isn't waiting on | |
752 | * an event, then it goes back to run state. | |
753 | * Otherwise, process goes back to sleep state. | |
754 | */ | |
755 | if (action == SIG_DFL) | |
756 | p->p_sig &= ~mask; | |
757 | if (action == SIG_CATCH) | |
758 | goto runfast; | |
759 | if (p->p_wchan == 0) | |
760 | goto run; | |
761 | p->p_stat = SSLEEP; | |
762 | goto out; | |
763 | } | |
764 | ||
765 | if (prop & SA_STOP) { | |
766 | /* | |
767 | * Already stopped, don't need to stop again. | |
768 | * (If we did the shell could get confused.) | |
769 | */ | |
770 | p->p_sig &= ~mask; /* take it away */ | |
771 | goto out; | |
772 | } | |
773 | ||
774 | /* | |
775 | * If process is sleeping interruptibly, then | |
776 | * simulate a wakeup so that when it is continued, | |
777 | * it will be made runnable and can look at the signal. | |
778 | * But don't setrun the process, leave it stopped. | |
779 | */ | |
780 | if (p->p_wchan && p->p_flag & SSINTR) | |
781 | unsleep(p); | |
782 | goto out; | |
783 | ||
784 | default: | |
785 | /* | |
786 | * SRUN, SIDL, SZOMB do nothing with the signal, | |
787 | * other than kicking ourselves if we are running. | |
788 | * It will either never be noticed, or noticed very soon. | |
789 | */ | |
790 | if (p == curproc) | |
791 | signotify(p); | |
792 | goto out; | |
793 | } | |
794 | /*NOTREACHED*/ | |
795 | ||
796 | runfast: | |
797 | /* | |
798 | * Raise priority to at least PUSER. | |
799 | */ | |
800 | if (p->p_pri > PUSER) | |
801 | p->p_pri = PUSER; | |
802 | run: | |
803 | setrun(p); | |
804 | out: | |
805 | splx(s); | |
806 | } | |
807 | ||
808 | /* | |
809 | * If the current process has a signal to process (should be caught | |
810 | * or cause termination, should interrupt current syscall), | |
811 | * return the signal number. Stop signals with default action | |
812 | * are processed immediately, then cleared; they aren't returned. | |
813 | * This is checked after each entry to the system for a syscall | |
814 | * or trap (though this can usually be done without actually calling | |
815 | * issig by checking the pending signal masks in the CURSIG macro.) | |
816 | * The normal call sequence is | |
817 | * | |
818 | * while (sig = CURSIG(curproc)) | |
819 | * psig(sig); | |
820 | */ | |
4c45483e | 821 | int |
15637ed4 RG |
822 | issig(p) |
823 | register struct proc *p; | |
824 | { | |
825 | register int sig, mask, prop; | |
826 | ||
827 | for (;;) { | |
828 | mask = p->p_sig &~ p->p_sigmask; | |
829 | if (p->p_flag&SPPWAIT) | |
830 | mask &= ~stopsigmask; | |
831 | if (mask == 0) /* no signal to send */ | |
832 | return (0); | |
833 | sig = ffs((long)mask); | |
834 | mask = sigmask(sig); | |
835 | prop = sigprop[sig]; | |
836 | /* | |
837 | * We should see pending but ignored signals | |
838 | * only if STRC was on when they were posted. | |
839 | */ | |
840 | if (mask & p->p_sigignore && (p->p_flag&STRC) == 0) { | |
841 | p->p_sig &= ~mask; | |
842 | continue; | |
843 | } | |
844 | if (p->p_flag&STRC && (p->p_flag&SPPWAIT) == 0) { | |
845 | /* | |
846 | * If traced, always stop, and stay | |
847 | * stopped until released by the parent. | |
848 | */ | |
849 | p->p_xstat = sig; | |
850 | psignal(p->p_pptr, SIGCHLD); | |
851 | do { | |
852 | stop(p); | |
853 | (void) splclock(); | |
854 | swtch(); | |
855 | (void) splnone(); | |
856 | } while (!procxmt(p) && p->p_flag&STRC); | |
857 | ||
858 | /* | |
859 | * If the traced bit got turned off, | |
860 | * go back up to the top to rescan signals. | |
861 | * This ensures that p_sig* and ps_sigact | |
862 | * are consistent. | |
863 | */ | |
864 | if ((p->p_flag&STRC) == 0) | |
865 | continue; | |
866 | ||
867 | /* | |
868 | * If parent wants us to take the signal, | |
869 | * then it will leave it in p->p_xstat; | |
870 | * otherwise we just look for signals again. | |
871 | */ | |
872 | p->p_sig &= ~mask; /* clear the old signal */ | |
873 | sig = p->p_xstat; | |
874 | if (sig == 0) | |
875 | continue; | |
876 | ||
877 | /* | |
878 | * Put the new signal into p_sig. | |
879 | * If signal is being masked, | |
880 | * look for other signals. | |
881 | */ | |
882 | mask = sigmask(sig); | |
883 | p->p_sig |= mask; | |
884 | if (p->p_sigmask & mask) | |
885 | continue; | |
886 | } | |
887 | ||
888 | /* | |
889 | * Decide whether the signal should be returned. | |
890 | * Return the signal's number, or fall through | |
891 | * to clear it from the pending mask. | |
892 | */ | |
893 | switch ((int)p->p_sigacts->ps_sigact[sig]) { | |
894 | ||
895 | case SIG_DFL: | |
896 | /* | |
897 | * Don't take default actions on system processes. | |
898 | */ | |
899 | if (p->p_pid <= 1) | |
900 | break; /* == ignore */ | |
901 | /* | |
902 | * If there is a pending stop signal to process | |
903 | * with default action, stop here, | |
904 | * then clear the signal. However, | |
905 | * if process is member of an orphaned | |
906 | * process group, ignore tty stop signals. | |
907 | */ | |
908 | if (prop & SA_STOP) { | |
909 | if (p->p_flag&STRC || | |
910 | (p->p_pgrp->pg_jobc == 0 && | |
911 | prop & SA_TTYSTOP)) | |
912 | break; /* == ignore */ | |
913 | p->p_xstat = sig; | |
914 | stop(p); | |
915 | if ((p->p_pptr->p_flag & SNOCLDSTOP) == 0) | |
916 | psignal(p->p_pptr, SIGCHLD); | |
917 | (void) splclock(); | |
918 | swtch(); | |
919 | (void) splnone(); | |
920 | break; | |
921 | } else if (prop & SA_IGNORE) { | |
922 | /* | |
923 | * Except for SIGCONT, shouldn't get here. | |
924 | * Default action is to ignore; drop it. | |
925 | */ | |
926 | break; /* == ignore */ | |
927 | } else | |
928 | return (sig); | |
929 | /*NOTREACHED*/ | |
930 | ||
931 | case SIG_IGN: | |
932 | /* | |
933 | * Masking above should prevent us ever trying | |
934 | * to take action on an ignored signal other | |
935 | * than SIGCONT, unless process is traced. | |
936 | */ | |
937 | if ((prop & SA_CONT) == 0 && (p->p_flag&STRC) == 0) | |
938 | printf("issig\n"); | |
939 | break; /* == ignore */ | |
940 | ||
941 | default: | |
942 | /* | |
943 | * This signal has an action, let | |
944 | * psig process it. | |
945 | */ | |
946 | return (sig); | |
947 | } | |
948 | p->p_sig &= ~mask; /* take the signal! */ | |
949 | } | |
950 | /* NOTREACHED */ | |
951 | } | |
952 | ||
953 | /* | |
954 | * Put the argument process into the stopped | |
955 | * state and notify the parent via wakeup. | |
956 | * Signals are handled elsewhere. | |
957 | * The process must not be on the run queue. | |
958 | */ | |
4c45483e | 959 | static void |
15637ed4 RG |
960 | stop(p) |
961 | register struct proc *p; | |
962 | { | |
963 | ||
964 | p->p_stat = SSTOP; | |
965 | p->p_flag &= ~SWTED; | |
966 | wakeup((caddr_t)p->p_pptr); | |
967 | } | |
968 | ||
969 | /* | |
970 | * Take the action for the specified signal | |
971 | * from the current set of pending signals. | |
972 | */ | |
973 | void | |
974 | psig(sig) | |
975 | register int sig; | |
976 | { | |
977 | register struct proc *p = curproc; | |
978 | register struct sigacts *ps = p->p_sigacts; | |
979 | register sig_t action; | |
980 | int mask, returnmask; | |
981 | ||
982 | #ifdef DIAGNOSTIC | |
983 | if (sig == 0) | |
984 | panic("psig"); | |
985 | #endif | |
986 | mask = sigmask(sig); | |
987 | p->p_sig &= ~mask; | |
988 | action = ps->ps_sigact[sig]; | |
989 | #ifdef KTRACE | |
990 | if (KTRPOINT(p, KTR_PSIG)) | |
991 | ktrpsig(p->p_tracep, sig, action, ps->ps_flags & SA_OLDMASK ? | |
992 | ps->ps_oldmask : p->p_sigmask, 0); | |
993 | #endif | |
994 | if (action == SIG_DFL) { | |
995 | /* | |
996 | * Default action, where the default is to kill | |
997 | * the process. (Other cases were ignored above.) | |
998 | */ | |
999 | sigexit(p, sig); | |
1000 | /* NOTREACHED */ | |
1001 | } else { | |
1002 | /* | |
1003 | * If we get here, the signal must be caught. | |
1004 | */ | |
1005 | #ifdef DIAGNOSTIC | |
1006 | if (action == SIG_IGN || (p->p_sigmask & mask)) | |
1007 | panic("psig action"); | |
1008 | #endif | |
1009 | /* | |
1010 | * Set the new mask value and also defer further | |
1011 | * occurences of this signal. | |
1012 | * | |
1013 | * Special case: user has done a sigpause. Here the | |
1014 | * current mask is not of interest, but rather the | |
1015 | * mask from before the sigpause is what we want | |
1016 | * restored after the signal processing is completed. | |
1017 | */ | |
1018 | (void) splhigh(); | |
1019 | if (ps->ps_flags & SA_OLDMASK) { | |
1020 | returnmask = ps->ps_oldmask; | |
1021 | ps->ps_flags &= ~SA_OLDMASK; | |
1022 | } else | |
1023 | returnmask = p->p_sigmask; | |
1024 | p->p_sigmask |= ps->ps_catchmask[sig] | mask; | |
1025 | (void) spl0(); | |
1026 | p->p_stats->p_ru.ru_nsignals++; | |
1027 | sendsig(action, sig, returnmask, 0); | |
1028 | } | |
1029 | } | |
1030 | ||
1031 | /* | |
1032 | * Force the current process to exit with the specified | |
1033 | * signal, dumping core if appropriate. We bypass the normal | |
1034 | * tests for masked and caught signals, allowing unrecoverable | |
1035 | * failures to terminate the process without changing signal state. | |
1036 | * Mark the accounting record with the signal termination. | |
1037 | * If dumping core, save the signal number for the debugger. | |
1038 | * Calls exit and does not return. | |
1039 | */ | |
4c45483e | 1040 | static void |
15637ed4 RG |
1041 | sigexit(p, sig) |
1042 | register struct proc *p; | |
1043 | int sig; | |
1044 | { | |
1045 | ||
1046 | p->p_acflag |= AXSIG; | |
1047 | if (sigprop[sig] & SA_CORE) { | |
1048 | p->p_sigacts->ps_sig = sig; | |
1523a604 GR |
1049 | /* |
1050 | * Log signals which would cause core dumps | |
c01ca970 GR |
1051 | * (Log as LOG_INFO to appease those who don't want |
1052 | * these messages.) | |
1053 | * XXX : Todo, as well as euid, write out ruid too | |
1523a604 | 1054 | */ |
26560360 | 1055 | log(LOG_INFO, "pid %d: %s: uid %d: exited on signal %d\n", |
1523a604 | 1056 | p->p_pid, p->p_comm, p->p_ucred->cr_uid, sig); |
15637ed4 RG |
1057 | if (coredump(p) == 0) |
1058 | sig |= WCOREFLAG; | |
1059 | } | |
e5b1af89 | 1060 | kexit(p, W_EXITCODE(0, sig)); |
15637ed4 RG |
1061 | /* NOTREACHED */ |
1062 | } | |
1063 | ||
1064 | /* | |
1065 | * Create a core dump. | |
ce723be2 CR |
1066 | * The file name is "progname.core". |
1067 | * Core dumps are not created if: | |
1068 | * the process is setuid, | |
1069 | * we are on a filesystem mounted with MNT_NOCORE, | |
1070 | * a file already exists and is not a core file, | |
1071 | * or was not produced from the same program, | |
1072 | * the link count to the corefile is > 1. | |
15637ed4 | 1073 | */ |
4c45483e | 1074 | int |
15637ed4 RG |
1075 | coredump(p) |
1076 | register struct proc *p; | |
1077 | { | |
1078 | register struct vnode *vp; | |
1079 | register struct pcred *pcred = p->p_cred; | |
1080 | register struct ucred *cred = pcred->pc_ucred; | |
1081 | register struct vmspace *vm = p->p_vmspace; | |
1082 | struct vattr vattr; | |
ce723be2 | 1083 | int error, error1, exists; |
15637ed4 | 1084 | struct nameidata nd; |
ce723be2 | 1085 | char name[MAXCOMLEN+6]; /* progname.core */ |
15637ed4 RG |
1086 | |
1087 | if (pcred->p_svuid != pcred->p_ruid || | |
1088 | pcred->p_svgid != pcred->p_rgid) | |
1089 | return (EFAULT); | |
1090 | if (ctob(UPAGES + vm->vm_dsize + vm->vm_ssize) >= | |
1091 | p->p_rlimit[RLIMIT_CORE].rlim_cur) | |
1092 | return (EFAULT); | |
ce723be2 CR |
1093 | if (p->p_fd->fd_cdir->v_mount->mnt_flag & MNT_NOCORE) |
1094 | return (EFAULT); | |
1095 | ||
1096 | sprintf(name, "%s.core", p->p_comm); | |
15637ed4 RG |
1097 | nd.ni_dirp = name; |
1098 | nd.ni_segflg = UIO_SYSSPACE; | |
cff1b394 | 1099 | if ((error = vn_open(&nd, p, FWRITE, 0600)) == 0) |
ce723be2 CR |
1100 | exists = 1; |
1101 | else | |
1102 | exists = 0; | |
1103 | if (error == ENOENT) | |
cff1b394 | 1104 | error = vn_open(&nd, p, O_CREAT | FWRITE, 0600); |
ce723be2 | 1105 | if (error) |
15637ed4 RG |
1106 | return (error); |
1107 | vp = nd.ni_vp; | |
1108 | if (vp->v_type != VREG || VOP_GETATTR(vp, &vattr, cred, p) || | |
1109 | vattr.va_nlink != 1) { | |
1110 | error = EFAULT; | |
1111 | goto out; | |
1112 | } | |
ce723be2 CR |
1113 | if (exists) { /* if file already exists, look if it's a coredump */ |
1114 | struct user userbuf; /* XXX */ | |
1115 | error = vn_rdwr(UIO_READ, vp, (caddr_t)&userbuf, sizeof(userbuf), | |
1116 | (off_t)0, UIO_SYSSPACE, IO_NODELOCKED|IO_UNIT, cred, | |
1117 | (int *)NULL, p); | |
1118 | if (error || (vattr.va_size != ctob(UPAGES + | |
1119 | userbuf.u_kproc.kp_eproc.e_vm.vm_dsize + | |
1120 | userbuf.u_kproc.kp_eproc.e_vm.vm_ssize)) || | |
1121 | strcmp(p->p_comm, userbuf.u_kproc.kp_proc.p_comm)) { | |
1122 | error = EFAULT; | |
1123 | goto out; | |
1124 | } | |
1125 | } | |
15637ed4 RG |
1126 | VATTR_NULL(&vattr); |
1127 | vattr.va_size = 0; | |
1128 | VOP_SETATTR(vp, &vattr, cred, p); | |
1129 | p->p_acflag |= ACORE; | |
1130 | bcopy(p, &p->p_addr->u_kproc.kp_proc, sizeof(struct proc)); | |
1131 | fill_eproc(p, &p->p_addr->u_kproc.kp_eproc); | |
1132 | #ifdef HPUXCOMPAT | |
1133 | /* | |
1134 | * BLETCH! If we loaded from an HPUX format binary file | |
1135 | * we have to dump an HPUX style user struct so that the | |
1136 | * HPUX debuggers can grok it. | |
1137 | */ | |
1138 | if (p->p_addr->u_pcb.pcb_flags & PCB_HPUXBIN) | |
1139 | error = hpuxdumpu(vp, cred); | |
1140 | else | |
1141 | #endif | |
1142 | error = vn_rdwr(UIO_WRITE, vp, (caddr_t) p->p_addr, ctob(UPAGES), | |
1143 | (off_t)0, UIO_SYSSPACE, IO_NODELOCKED|IO_UNIT, cred, (int *) NULL, | |
1144 | p); | |
1145 | if (error == 0) | |
1146 | error = vn_rdwr(UIO_WRITE, vp, vm->vm_daddr, | |
1147 | (int)ctob(vm->vm_dsize), (off_t)ctob(UPAGES), UIO_USERSPACE, | |
1148 | IO_NODELOCKED|IO_UNIT, cred, (int *) NULL, p); | |
1149 | if (error == 0) | |
1150 | error = vn_rdwr(UIO_WRITE, vp, | |
1151 | (caddr_t) trunc_page(vm->vm_maxsaddr + MAXSSIZ | |
1152 | - ctob(vm->vm_ssize)), | |
1153 | round_page(ctob(vm->vm_ssize)), | |
1154 | (off_t)ctob(UPAGES) + ctob(vm->vm_dsize), UIO_USERSPACE, | |
1155 | IO_NODELOCKED|IO_UNIT, cred, (int *) NULL, p); | |
1156 | out: | |
1157 | VOP_UNLOCK(vp); | |
1158 | error1 = vn_close(vp, FWRITE, cred, p); | |
1159 | if (error == 0) | |
1160 | error = error1; | |
1161 | return (error); | |
1162 | } | |
1163 | ||
1164 | /* | |
1165 | * Nonexistent system call-- signal process (may want to handle it). | |
1166 | * Flag error in case process won't see signal immediately (blocked or ignored). | |
1167 | */ | |
1168 | /* ARGSUSED */ | |
4c45483e | 1169 | int |
15637ed4 RG |
1170 | nosys(p, args, retval) |
1171 | struct proc *p; | |
1172 | void *args; | |
1173 | int *retval; | |
1174 | { | |
1175 | ||
1176 | psignal(p, SIGSYS); | |
1177 | return (EINVAL); | |
1178 | } |