Commit | Line | Data |
---|---|---|
da7c5cc6 | 1 | /* |
8429d022 | 2 | * Copyright (c) 1982, 1986, 1989, 1991 Regents of the University of California. |
d86a61ec | 3 | * All rights reserved. |
da7c5cc6 | 4 | * |
dbf0c423 | 5 | * %sccs.include.redist.c% |
d86a61ec | 6 | * |
73f4d5f1 | 7 | * @(#)kern_sig.c 7.56 (Berkeley) %G% |
da7c5cc6 | 8 | */ |
961945a8 | 9 | |
8429d022 | 10 | #define SIGPROP /* include signal properties table */ |
38a01dbe KB |
11 | #include <sys/param.h> |
12 | #include <sys/signalvar.h> | |
13 | #include <sys/resourcevar.h> | |
14 | #include <sys/namei.h> | |
15 | #include <sys/vnode.h> | |
16 | #include <sys/proc.h> | |
17 | #include <sys/systm.h> | |
18 | #include <sys/timeb.h> | |
19 | #include <sys/times.h> | |
20 | #include <sys/buf.h> | |
21 | #include <sys/acct.h> | |
22 | #include <sys/file.h> | |
23 | #include <sys/kernel.h> | |
24 | #include <sys/wait.h> | |
25 | #include <sys/ktrace.h> | |
055fc5f3 | 26 | #include <sys/syslog.h> |
687880f9 | 27 | |
38a01dbe | 28 | #include <machine/cpu.h> |
8e6cd807 | 29 | |
38a01dbe | 30 | #include <vm/vm.h> |
38a01dbe | 31 | #include <sys/user.h> /* for coredump */ |
d301d150 | 32 | |
2e143991 | 33 | /* |
8429d022 | 34 | * Can process p, with pcred pc, send the signal signo to process q? |
2e143991 | 35 | */ |
8429d022 MK |
36 | #define CANSIGNAL(p, pc, q, signo) \ |
37 | ((pc)->pc_ucred->cr_uid == 0 || \ | |
38 | (pc)->p_ruid == (q)->p_cred->p_ruid || \ | |
39 | (pc)->pc_ucred->cr_uid == (q)->p_cred->p_ruid || \ | |
40 | (pc)->p_ruid == (q)->p_ucred->cr_uid || \ | |
41 | (pc)->pc_ucred->cr_uid == (q)->p_ucred->cr_uid || \ | |
e635a749 MK |
42 | ((signo) == SIGCONT && (q)->p_session == (p)->p_session)) |
43 | ||
9e97623a CT |
44 | struct sigaction_args { |
45 | int signo; | |
46 | struct sigaction *nsa; | |
47 | struct sigaction *osa; | |
48 | }; | |
e635a749 MK |
49 | /* ARGSUSED */ |
50 | sigaction(p, uap, retval) | |
51 | struct proc *p; | |
9e97623a | 52 | register struct sigaction_args *uap; |
e635a749 MK |
53 | int *retval; |
54 | { | |
f4af9a5b MK |
55 | struct sigaction vec; |
56 | register struct sigaction *sa; | |
8429d022 | 57 | register struct sigacts *ps = p->p_sigacts; |
dd012d1e | 58 | register int sig; |
f4af9a5b | 59 | int bit, error; |
dd012d1e SL |
60 | |
61 | sig = uap->signo; | |
f4af9a5b | 62 | if (sig <= 0 || sig >= NSIG || sig == SIGKILL || sig == SIGSTOP) |
d9c2f47f | 63 | return (EINVAL); |
f4af9a5b MK |
64 | sa = &vec; |
65 | if (uap->osa) { | |
8429d022 MK |
66 | sa->sa_handler = ps->ps_sigact[sig]; |
67 | sa->sa_mask = ps->ps_catchmask[sig]; | |
fe7f81f4 | 68 | bit = sigmask(sig); |
f4af9a5b | 69 | sa->sa_flags = 0; |
8429d022 | 70 | if ((ps->ps_sigonstack & bit) != 0) |
f4af9a5b | 71 | sa->sa_flags |= SA_ONSTACK; |
8429d022 | 72 | if ((ps->ps_sigintr & bit) == 0) |
f4af9a5b | 73 | sa->sa_flags |= SA_RESTART; |
e635a749 | 74 | if (p->p_flag & SNOCLDSTOP) |
f4af9a5b MK |
75 | sa->sa_flags |= SA_NOCLDSTOP; |
76 | if (error = copyout((caddr_t)sa, (caddr_t)uap->osa, | |
77 | sizeof (vec))) | |
d9c2f47f | 78 | return (error); |
457aa395 | 79 | } |
f4af9a5b MK |
80 | if (uap->nsa) { |
81 | if (error = copyin((caddr_t)uap->nsa, (caddr_t)sa, | |
82 | sizeof (vec))) | |
d9c2f47f | 83 | return (error); |
e635a749 | 84 | setsigvec(p, sig, sa); |
457aa395 | 85 | } |
d9c2f47f | 86 | return (0); |
dd012d1e | 87 | } |
4147b3f6 | 88 | |
e635a749 MK |
89 | setsigvec(p, sig, sa) |
90 | register struct proc *p; | |
457aa395 | 91 | int sig; |
f4af9a5b | 92 | register struct sigaction *sa; |
dd012d1e | 93 | { |
8429d022 | 94 | register struct sigacts *ps = p->p_sigacts; |
457aa395 | 95 | register int bit; |
dd012d1e | 96 | |
feff6b5a | 97 | bit = sigmask(sig); |
dd012d1e SL |
98 | /* |
99 | * Change setting atomically. | |
100 | */ | |
feff6b5a | 101 | (void) splhigh(); |
8429d022 MK |
102 | ps->ps_sigact[sig] = sa->sa_handler; |
103 | ps->ps_catchmask[sig] = sa->sa_mask &~ sigcantmask; | |
f4af9a5b | 104 | if ((sa->sa_flags & SA_RESTART) == 0) |
8429d022 | 105 | ps->ps_sigintr |= bit; |
fe7f81f4 | 106 | else |
8429d022 | 107 | ps->ps_sigintr &= ~bit; |
f4af9a5b | 108 | if (sa->sa_flags & SA_ONSTACK) |
8429d022 | 109 | ps->ps_sigonstack |= bit; |
457aa395 | 110 | else |
8429d022 | 111 | ps->ps_sigonstack &= ~bit; |
0cbc4437 CT |
112 | #ifdef COMPAT_SUNOS |
113 | if (sa->sa_flags & SA_USERTRAMP) | |
114 | ps->ps_usertramp |= bit; | |
115 | else | |
116 | ps->ps_usertramp &= ~bit; | |
117 | #endif | |
f4af9a5b MK |
118 | if (sig == SIGCHLD) { |
119 | if (sa->sa_flags & SA_NOCLDSTOP) | |
120 | p->p_flag |= SNOCLDSTOP; | |
121 | else | |
122 | p->p_flag &= ~SNOCLDSTOP; | |
123 | } | |
124 | /* | |
125 | * Set bit in p_sigignore for signals that are set to SIG_IGN, | |
126 | * and for signals set to SIG_DFL where the default is to ignore. | |
127 | * However, don't put SIGCONT in p_sigignore, | |
128 | * as we have to restart the process. | |
129 | */ | |
130 | if (sa->sa_handler == SIG_IGN || | |
8429d022 | 131 | (sigprop[sig] & SA_IGNORE && sa->sa_handler == SIG_DFL)) { |
457aa395 | 132 | p->p_sig &= ~bit; /* never to be seen again */ |
f4af9a5b MK |
133 | if (sig != SIGCONT) |
134 | p->p_sigignore |= bit; /* easier in psignal */ | |
457aa395 | 135 | p->p_sigcatch &= ~bit; |
dd012d1e | 136 | } else { |
457aa395 | 137 | p->p_sigignore &= ~bit; |
f4af9a5b | 138 | if (sa->sa_handler == SIG_DFL) |
457aa395 | 139 | p->p_sigcatch &= ~bit; |
dd012d1e | 140 | else |
457aa395 | 141 | p->p_sigcatch |= bit; |
dd012d1e SL |
142 | } |
143 | (void) spl0(); | |
4147b3f6 BJ |
144 | } |
145 | ||
f4af9a5b MK |
146 | /* |
147 | * Initialize signal state for process 0; | |
148 | * set to ignore signals that are ignored by default. | |
149 | */ | |
8429d022 | 150 | void |
f4af9a5b MK |
151 | siginit(p) |
152 | struct proc *p; | |
153 | { | |
8429d022 | 154 | register int i; |
f4af9a5b | 155 | |
8429d022 MK |
156 | for (i = 0; i < NSIG; i++) |
157 | if (sigprop[i] & SA_IGNORE && i != SIGCONT) | |
158 | p->p_sigignore |= sigmask(i); | |
f4af9a5b MK |
159 | } |
160 | ||
161 | /* | |
162 | * Reset signals for an exec of the specified process. | |
163 | */ | |
8429d022 | 164 | void |
f4af9a5b MK |
165 | execsigs(p) |
166 | register struct proc *p; | |
167 | { | |
8429d022 | 168 | register struct sigacts *ps = p->p_sigacts; |
f4af9a5b MK |
169 | register int nc, mask; |
170 | ||
171 | /* | |
172 | * Reset caught signals. Held signals remain held | |
173 | * through p_sigmask (unless they were caught, | |
174 | * and are now ignored by default). | |
175 | */ | |
176 | while (p->p_sigcatch) { | |
177 | nc = ffs((long)p->p_sigcatch); | |
178 | mask = sigmask(nc); | |
179 | p->p_sigcatch &= ~mask; | |
8429d022 | 180 | if (sigprop[nc] & SA_IGNORE) { |
f4af9a5b MK |
181 | if (nc != SIGCONT) |
182 | p->p_sigignore |= mask; | |
183 | p->p_sig &= ~mask; | |
184 | } | |
8429d022 | 185 | ps->ps_sigact[nc] = SIG_DFL; |
f4af9a5b MK |
186 | } |
187 | /* | |
188 | * Reset stack state to the user stack. | |
189 | * Clear set of signals caught on the signal stack. | |
190 | */ | |
ebf08548 KM |
191 | ps->ps_sigstk.ss_flags = SA_DISABLE; |
192 | ps->ps_sigstk.ss_size = 0; | |
193 | ps->ps_sigstk.ss_base = 0; | |
194 | ps->ps_flags = 0; | |
f4af9a5b MK |
195 | } |
196 | ||
197 | /* | |
198 | * Manipulate signal mask. | |
199 | * Note that we receive new mask, not pointer, | |
200 | * and return old mask as return value; | |
201 | * the library stub does the rest. | |
202 | */ | |
9e97623a CT |
203 | struct sigprocmask_args { |
204 | int how; | |
205 | sigset_t mask; | |
206 | }; | |
e635a749 MK |
207 | sigprocmask(p, uap, retval) |
208 | register struct proc *p; | |
9e97623a | 209 | struct sigprocmask_args *uap; |
e635a749 MK |
210 | int *retval; |
211 | { | |
f4af9a5b MK |
212 | int error = 0; |
213 | ||
e635a749 | 214 | *retval = p->p_sigmask; |
f4af9a5b MK |
215 | (void) splhigh(); |
216 | ||
217 | switch (uap->how) { | |
218 | case SIG_BLOCK: | |
219 | p->p_sigmask |= uap->mask &~ sigcantmask; | |
220 | break; | |
221 | ||
222 | case SIG_UNBLOCK: | |
223 | p->p_sigmask &= ~uap->mask; | |
224 | break; | |
225 | ||
226 | case SIG_SETMASK: | |
227 | p->p_sigmask = uap->mask &~ sigcantmask; | |
228 | break; | |
229 | ||
230 | default: | |
231 | error = EINVAL; | |
232 | break; | |
233 | } | |
234 | (void) spl0(); | |
d9c2f47f | 235 | return (error); |
f4af9a5b MK |
236 | } |
237 | ||
9e97623a CT |
238 | struct sigpending_args { |
239 | int dummy; | |
240 | }; | |
e635a749 MK |
241 | /* ARGSUSED */ |
242 | sigpending(p, uap, retval) | |
243 | struct proc *p; | |
9e97623a | 244 | struct sigpending_args *uap; |
e635a749 | 245 | int *retval; |
f4af9a5b MK |
246 | { |
247 | ||
e635a749 | 248 | *retval = p->p_sig; |
d9c2f47f | 249 | return (0); |
f4af9a5b MK |
250 | } |
251 | ||
0cbc4437 | 252 | #if defined(COMPAT_43) || defined(COMPAT_SUNOS) |
f4af9a5b MK |
253 | /* |
254 | * Generalized interface signal handler, 4.3-compatible. | |
255 | */ | |
9e97623a CT |
256 | struct osigvec_args { |
257 | int signo; | |
258 | struct sigvec *nsv; | |
259 | struct sigvec *osv; | |
260 | }; | |
e635a749 MK |
261 | /* ARGSUSED */ |
262 | osigvec(p, uap, retval) | |
263 | struct proc *p; | |
9e97623a | 264 | register struct osigvec_args *uap; |
e635a749 MK |
265 | int *retval; |
266 | { | |
f4af9a5b | 267 | struct sigvec vec; |
8429d022 | 268 | register struct sigacts *ps = p->p_sigacts; |
f4af9a5b MK |
269 | register struct sigvec *sv; |
270 | register int sig; | |
271 | int bit, error; | |
272 | ||
273 | sig = uap->signo; | |
274 | if (sig <= 0 || sig >= NSIG || sig == SIGKILL || sig == SIGSTOP) | |
d9c2f47f | 275 | return (EINVAL); |
f4af9a5b MK |
276 | sv = &vec; |
277 | if (uap->osv) { | |
8429d022 MK |
278 | *(sig_t *)&sv->sv_handler = ps->ps_sigact[sig]; |
279 | sv->sv_mask = ps->ps_catchmask[sig]; | |
f4af9a5b MK |
280 | bit = sigmask(sig); |
281 | sv->sv_flags = 0; | |
8429d022 | 282 | if ((ps->ps_sigonstack & bit) != 0) |
f4af9a5b | 283 | sv->sv_flags |= SV_ONSTACK; |
8429d022 | 284 | if ((ps->ps_sigintr & bit) != 0) |
f4af9a5b | 285 | sv->sv_flags |= SV_INTERRUPT; |
0cbc4437 | 286 | #ifndef COMPAT_SUNOS |
e635a749 | 287 | if (p->p_flag & SNOCLDSTOP) |
f4af9a5b | 288 | sv->sv_flags |= SA_NOCLDSTOP; |
0cbc4437 | 289 | #endif |
f4af9a5b MK |
290 | if (error = copyout((caddr_t)sv, (caddr_t)uap->osv, |
291 | sizeof (vec))) | |
d9c2f47f | 292 | return (error); |
f4af9a5b MK |
293 | } |
294 | if (uap->nsv) { | |
295 | if (error = copyin((caddr_t)uap->nsv, (caddr_t)sv, | |
296 | sizeof (vec))) | |
d9c2f47f | 297 | return (error); |
0cbc4437 CT |
298 | #ifdef COMPAT_SUNOS |
299 | /* | |
0c1cfb60 KM |
300 | * SunOS uses this bit (4, aka SA_DISABLE) as SV_RESETHAND, |
301 | * `reset to SIG_DFL on delivery'. We have no such option | |
302 | * now or ever! | |
0cbc4437 | 303 | */ |
0c1cfb60 | 304 | if (sv->sv_flags & SA_DISABLE) |
0cbc4437 CT |
305 | return (EINVAL); |
306 | sv->sv_flags |= SA_USERTRAMP; | |
307 | #endif | |
f4af9a5b | 308 | sv->sv_flags ^= SA_RESTART; /* opposite of SV_INTERRUPT */ |
e635a749 | 309 | setsigvec(p, sig, (struct sigaction *)sv); |
f4af9a5b | 310 | } |
d9c2f47f | 311 | return (0); |
f4af9a5b MK |
312 | } |
313 | ||
9e97623a CT |
314 | struct osigblock_args { |
315 | int mask; | |
316 | }; | |
e635a749 MK |
317 | osigblock(p, uap, retval) |
318 | register struct proc *p; | |
9e97623a | 319 | struct osigblock_args *uap; |
e635a749 MK |
320 | int *retval; |
321 | { | |
4147b3f6 | 322 | |
feff6b5a | 323 | (void) splhigh(); |
e635a749 | 324 | *retval = p->p_sigmask; |
f4af9a5b | 325 | p->p_sigmask |= uap->mask &~ sigcantmask; |
dd012d1e | 326 | (void) spl0(); |
d9c2f47f | 327 | return (0); |
4147b3f6 BJ |
328 | } |
329 | ||
9e97623a CT |
330 | struct osigsetmask_args { |
331 | int mask; | |
332 | }; | |
e635a749 MK |
333 | osigsetmask(p, uap, retval) |
334 | struct proc *p; | |
9e97623a | 335 | struct osigsetmask_args *uap; |
e635a749 MK |
336 | int *retval; |
337 | { | |
687880f9 | 338 | |
feff6b5a | 339 | (void) splhigh(); |
e635a749 | 340 | *retval = p->p_sigmask; |
f4af9a5b | 341 | p->p_sigmask = uap->mask &~ sigcantmask; |
dd012d1e | 342 | (void) spl0(); |
d9c2f47f | 343 | return (0); |
687880f9 | 344 | } |
0c1cfb60 | 345 | #endif /* COMPAT_43 || COMPAT_SUNOS */ |
687880f9 | 346 | |
f4af9a5b MK |
347 | /* |
348 | * Suspend process until signal, providing mask to be set | |
349 | * in the meantime. Note nonstandard calling convention: | |
350 | * libc stub passes mask, not pointer, to save a copyin. | |
351 | */ | |
9e97623a CT |
352 | struct sigsuspend_args { |
353 | sigset_t mask; | |
354 | }; | |
e635a749 MK |
355 | /* ARGSUSED */ |
356 | sigsuspend(p, uap, retval) | |
357 | register struct proc *p; | |
9e97623a | 358 | struct sigsuspend_args *uap; |
e635a749 MK |
359 | int *retval; |
360 | { | |
8429d022 | 361 | register struct sigacts *ps = p->p_sigacts; |
4147b3f6 | 362 | |
dd012d1e SL |
363 | /* |
364 | * When returning from sigpause, we want | |
365 | * the old mask to be restored after the | |
366 | * signal handler has finished. Thus, we | |
5077c7b9 MK |
367 | * save it here and mark the sigacts structure |
368 | * to indicate this. | |
dd012d1e | 369 | */ |
8429d022 | 370 | ps->ps_oldmask = p->p_sigmask; |
ebf08548 | 371 | ps->ps_flags |= SAS_OLDMASK; |
f4af9a5b | 372 | p->p_sigmask = uap->mask &~ sigcantmask; |
92900edc KM |
373 | while (tsleep((caddr_t) ps, PPAUSE|PCATCH, "pause", 0) == 0) |
374 | /* void */; | |
22585170 | 375 | /* always return EINTR rather than ERESTART... */ |
d9c2f47f | 376 | return (EINTR); |
4147b3f6 BJ |
377 | } |
378 | ||
0c1cfb60 | 379 | #if defined(COMPAT_43) || defined(COMPAT_SUNOS) |
9e97623a CT |
380 | struct osigstack_args { |
381 | struct sigstack *nss; | |
382 | struct sigstack *oss; | |
383 | }; | |
e635a749 | 384 | /* ARGSUSED */ |
ebf08548 | 385 | osigstack(p, uap, retval) |
e635a749 | 386 | struct proc *p; |
9e97623a | 387 | register struct osigstack_args *uap; |
e635a749 MK |
388 | int *retval; |
389 | { | |
457aa395 | 390 | struct sigstack ss; |
ebf08548 | 391 | struct sigacts *psp; |
f4af9a5b MK |
392 | int error = 0; |
393 | ||
ebf08548 KM |
394 | psp = p->p_sigacts; |
395 | ss.ss_sp = psp->ps_sigstk.ss_base; | |
396 | ss.ss_onstack = psp->ps_sigstk.ss_flags & SA_ONSTACK; | |
397 | if (uap->oss && (error = copyout((caddr_t)&ss, (caddr_t)uap->oss, | |
398 | sizeof (struct sigstack)))) | |
d9c2f47f | 399 | return (error); |
f4af9a5b | 400 | if (uap->nss && (error = copyin((caddr_t)uap->nss, (caddr_t)&ss, |
ebf08548 KM |
401 | sizeof (ss))) == 0) { |
402 | psp->ps_sigstk.ss_base = ss.ss_sp; | |
403 | psp->ps_sigstk.ss_size = 0; | |
404 | psp->ps_sigstk.ss_flags |= ss.ss_onstack & SA_ONSTACK; | |
405 | psp->ps_flags |= SAS_ALTSTACK; | |
406 | } | |
d9c2f47f | 407 | return (error); |
4147b3f6 | 408 | } |
0c1cfb60 | 409 | #endif /* COMPAT_43 || COMPAT_SUNOS */ |
ebf08548 | 410 | |
9e97623a CT |
411 | struct sigaltstack_args { |
412 | struct sigaltstack *nss; | |
413 | struct sigaltstack *oss; | |
414 | }; | |
ebf08548 KM |
415 | /* ARGSUSED */ |
416 | sigaltstack(p, uap, retval) | |
417 | struct proc *p; | |
9e97623a | 418 | register struct sigaltstack_args *uap; |
ebf08548 KM |
419 | int *retval; |
420 | { | |
421 | struct sigacts *psp; | |
422 | struct sigaltstack ss; | |
423 | int error; | |
424 | ||
425 | psp = p->p_sigacts; | |
426 | if ((psp->ps_flags & SAS_ALTSTACK) == 0) | |
427 | psp->ps_sigstk.ss_flags |= SA_DISABLE; | |
428 | if (uap->oss && (error = copyout((caddr_t)&psp->ps_sigstk, | |
429 | (caddr_t)uap->oss, sizeof (struct sigaltstack)))) | |
430 | return (error); | |
d9a7fa42 KM |
431 | if (uap->nss == 0) |
432 | return (0); | |
433 | if (error = copyin((caddr_t)uap->nss, (caddr_t)&ss, sizeof (ss))) | |
ebf08548 KM |
434 | return (error); |
435 | if (ss.ss_flags & SA_DISABLE) { | |
436 | if (psp->ps_sigstk.ss_flags & SA_ONSTACK) | |
437 | return (EINVAL); | |
438 | psp->ps_flags &= ~SAS_ALTSTACK; | |
439 | psp->ps_sigstk.ss_flags = ss.ss_flags; | |
440 | return (0); | |
441 | } | |
442 | if (ss.ss_size < MINSIGSTKSZ) | |
443 | return (ENOMEM); | |
444 | psp->ps_flags |= SAS_ALTSTACK; | |
445 | psp->ps_sigstk= ss; | |
446 | return (0); | |
447 | } | |
4147b3f6 | 448 | |
9e97623a CT |
449 | struct kill_args { |
450 | int pid; | |
451 | int signo; | |
452 | }; | |
e635a749 MK |
453 | /* ARGSUSED */ |
454 | kill(cp, uap, retval) | |
455 | register struct proc *cp; | |
9e97623a | 456 | register struct kill_args *uap; |
e635a749 MK |
457 | int *retval; |
458 | { | |
7713be67 | 459 | register struct proc *p; |
8429d022 | 460 | register struct pcred *pc = cp->p_cred; |
1e3738da | 461 | |
f4af9a5b | 462 | if ((unsigned) uap->signo >= NSIG) |
d9c2f47f | 463 | return (EINVAL); |
7713be67 KM |
464 | if (uap->pid > 0) { |
465 | /* kill single process */ | |
466 | p = pfind(uap->pid); | |
f4af9a5b | 467 | if (p == 0) |
d9c2f47f | 468 | return (ESRCH); |
8429d022 | 469 | if (!CANSIGNAL(cp, pc, p, uap->signo)) |
d9c2f47f | 470 | return (EPERM); |
f4af9a5b | 471 | if (uap->signo) |
7713be67 | 472 | psignal(p, uap->signo); |
d9c2f47f | 473 | return (0); |
7713be67 KM |
474 | } |
475 | switch (uap->pid) { | |
476 | case -1: /* broadcast signal */ | |
d9c2f47f | 477 | return (killpg1(cp, uap->signo, 0, 1)); |
7713be67 | 478 | case 0: /* signal own process group */ |
d9c2f47f | 479 | return (killpg1(cp, uap->signo, 0, 0)); |
7713be67 | 480 | default: /* negative explicit process group */ |
d9c2f47f | 481 | return (killpg1(cp, uap->signo, -uap->pid, 0)); |
7713be67 | 482 | } |
f4af9a5b | 483 | /* NOTREACHED */ |
1e3738da BJ |
484 | } |
485 | ||
0cbc4437 | 486 | #if defined(COMPAT_43) || defined(COMPAT_SUNOS) |
9e97623a CT |
487 | struct okillpg_args { |
488 | int pgid; | |
489 | int signo; | |
490 | }; | |
e635a749 MK |
491 | /* ARGSUSED */ |
492 | okillpg(p, uap, retval) | |
493 | struct proc *p; | |
9e97623a | 494 | register struct okillpg_args *uap; |
e635a749 MK |
495 | int *retval; |
496 | { | |
1e3738da | 497 | |
f4af9a5b | 498 | if ((unsigned) uap->signo >= NSIG) |
d9c2f47f MK |
499 | return (EINVAL); |
500 | return (killpg1(p, uap->signo, uap->pgid, 0)); | |
1e3738da | 501 | } |
0c1cfb60 | 502 | #endif /* COMPAT_43 || COMPAT_SUNOS */ |
dd012d1e | 503 | |
e635a749 MK |
504 | /* |
505 | * Common code for kill process group/broadcast kill. | |
506 | * cp is calling process. | |
507 | */ | |
508 | killpg1(cp, signo, pgid, all) | |
509 | register struct proc *cp; | |
8fe87cbb | 510 | int signo, pgid, all; |
3b4f6e10 SL |
511 | { |
512 | register struct proc *p; | |
8429d022 | 513 | register struct pcred *pc = cp->p_cred; |
8fe87cbb | 514 | struct pgrp *pgrp; |
8429d022 | 515 | int nfound = 0; |
8fe87cbb MT |
516 | |
517 | if (all) | |
518 | /* | |
519 | * broadcast | |
687880f9 | 520 | */ |
80a8e5e6 | 521 | for (p = (struct proc *)allproc; p != NULL; p = p->p_nxt) { |
90f62fff | 522 | if (p->p_pid <= 1 || p->p_flag & SSYS || |
8429d022 | 523 | p == cp || !CANSIGNAL(cp, pc, p, signo)) |
8fe87cbb | 524 | continue; |
8429d022 | 525 | nfound++; |
8fe87cbb MT |
526 | if (signo) |
527 | psignal(p, signo); | |
528 | } | |
529 | else { | |
530 | if (pgid == 0) | |
531 | /* | |
532 | * zero pgid means send to my process group. | |
533 | */ | |
8429d022 | 534 | pgrp = cp->p_pgrp; |
8fe87cbb MT |
535 | else { |
536 | pgrp = pgfind(pgid); | |
537 | if (pgrp == NULL) | |
f4af9a5b | 538 | return (ESRCH); |
8fe87cbb | 539 | } |
8fe87cbb | 540 | for (p = pgrp->pg_mem; p != NULL; p = p->p_pgrpnxt) { |
90f62fff | 541 | if (p->p_pid <= 1 || p->p_flag & SSYS || |
e3448cc4 | 542 | p->p_stat == SZOMB || !CANSIGNAL(cp, pc, p, signo)) |
8fe87cbb | 543 | continue; |
8429d022 | 544 | nfound++; |
8fe87cbb MT |
545 | if (signo) |
546 | psignal(p, signo); | |
7713be67 | 547 | } |
687880f9 | 548 | } |
8429d022 | 549 | return (nfound ? 0 : ESRCH); |
4147b3f6 | 550 | } |
687880f9 | 551 | |
e635a749 | 552 | /* |
687880f9 | 553 | * Send the specified signal to |
8fe87cbb | 554 | * all processes with 'pgid' as |
687880f9 | 555 | * process group. |
687880f9 | 556 | */ |
8429d022 | 557 | void |
8fe87cbb | 558 | gsignal(pgid, sig) |
8429d022 | 559 | int pgid, sig; |
8fe87cbb | 560 | { |
f4af9a5b | 561 | struct pgrp *pgrp; |
8fe87cbb | 562 | |
f4af9a5b | 563 | if (pgid && (pgrp = pgfind(pgid))) |
c697d0b9 | 564 | pgsignal(pgrp, sig, 0); |
8fe87cbb | 565 | } |
e635a749 | 566 | |
22585170 | 567 | /* |
c697d0b9 MT |
568 | * Send sig to every member of a process group. |
569 | * If checktty is 1, limit to members which have a controlling | |
570 | * terminal. | |
22585170 | 571 | */ |
8429d022 | 572 | void |
c697d0b9 | 573 | pgsignal(pgrp, sig, checkctty) |
f4af9a5b | 574 | struct pgrp *pgrp; |
8429d022 | 575 | int sig, checkctty; |
687880f9 BJ |
576 | { |
577 | register struct proc *p; | |
578 | ||
22585170 MT |
579 | if (pgrp) |
580 | for (p = pgrp->pg_mem; p != NULL; p = p->p_pgrpnxt) | |
90f62fff | 581 | if (checkctty == 0 || p->p_flag & SCTTY) |
c697d0b9 | 582 | psignal(p, sig); |
f4af9a5b MK |
583 | } |
584 | ||
585 | /* | |
586 | * Send a signal caused by a trap to the current process. | |
587 | * If it will be caught immediately, deliver it with correct code. | |
588 | * Otherwise, post it normally. | |
589 | */ | |
8429d022 MK |
590 | void |
591 | trapsignal(p, sig, code) | |
592 | struct proc *p; | |
f4af9a5b MK |
593 | register int sig; |
594 | unsigned code; | |
595 | { | |
8429d022 | 596 | register struct sigacts *ps = p->p_sigacts; |
f4af9a5b MK |
597 | int mask; |
598 | ||
599 | mask = sigmask(sig); | |
600 | if ((p->p_flag & STRC) == 0 && (p->p_sigcatch & mask) != 0 && | |
601 | (p->p_sigmask & mask) == 0) { | |
8429d022 | 602 | p->p_stats->p_ru.ru_nsignals++; |
22585170 MT |
603 | #ifdef KTRACE |
604 | if (KTRPOINT(p, KTR_PSIG)) | |
8429d022 | 605 | ktrpsig(p->p_tracep, sig, ps->ps_sigact[sig], |
22585170 MT |
606 | p->p_sigmask, code); |
607 | #endif | |
8429d022 | 608 | sendsig(ps->ps_sigact[sig], sig, p->p_sigmask, code); |
8429d022 | 609 | p->p_sigmask |= ps->ps_catchmask[sig] | mask; |
f4af9a5b | 610 | } else { |
8429d022 | 611 | ps->ps_code = code; /* XXX for core dump/debugger */ |
8fe87cbb | 612 | psignal(p, sig); |
f4af9a5b | 613 | } |
687880f9 BJ |
614 | } |
615 | ||
616 | /* | |
22585170 | 617 | * Send the specified signal to the specified process. |
8429d022 MK |
618 | * If the signal has an action, the action is usually performed |
619 | * by the target process rather than the caller; we simply add | |
620 | * the signal to the set of pending signals for the process. | |
22585170 MT |
621 | * Exceptions: |
622 | * o When a stop signal is sent to a sleeping process that takes the default | |
623 | * action, the process is stopped without awakening it. | |
624 | * o SIGCONT restarts stopped processes (or puts them back to sleep) | |
625 | * regardless of the signal action (eg, blocked or ignored). | |
626 | * Other ignored signals are discarded immediately. | |
687880f9 | 627 | */ |
8429d022 | 628 | void |
687880f9 BJ |
629 | psignal(p, sig) |
630 | register struct proc *p; | |
631 | register int sig; | |
632 | { | |
8429d022 | 633 | register int s, prop; |
f4af9a5b | 634 | register sig_t action; |
feff6b5a | 635 | int mask; |
687880f9 | 636 | |
f4af9a5b MK |
637 | if ((unsigned)sig >= NSIG || sig == 0) |
638 | panic("psignal sig"); | |
feff6b5a | 639 | mask = sigmask(sig); |
8429d022 | 640 | prop = sigprop[sig]; |
687880f9 BJ |
641 | |
642 | /* | |
643 | * If proc is traced, always give parent a chance. | |
687880f9 BJ |
644 | */ |
645 | if (p->p_flag & STRC) | |
646 | action = SIG_DFL; | |
647 | else { | |
687880f9 | 648 | /* |
dd012d1e SL |
649 | * If the signal is being ignored, |
650 | * then we forget about it immediately. | |
f4af9a5b MK |
651 | * (Note: we don't set SIGCONT in p_sigignore, |
652 | * and if it is set to SIG_IGN, | |
653 | * action will be SIG_DFL here.) | |
687880f9 | 654 | */ |
feff6b5a | 655 | if (p->p_sigignore & mask) |
687880f9 | 656 | return; |
feff6b5a | 657 | if (p->p_sigmask & mask) |
dd012d1e | 658 | action = SIG_HOLD; |
feff6b5a | 659 | else if (p->p_sigcatch & mask) |
dd012d1e | 660 | action = SIG_CATCH; |
e51c8e4a | 661 | else |
dd012d1e | 662 | action = SIG_DFL; |
687880f9 | 663 | } |
687880f9 | 664 | |
90f62fff KM |
665 | if (p->p_nice > NZERO && action == SIG_DFL && (prop & SA_KILL) && |
666 | (p->p_flag & STRC) == 0) | |
8429d022 | 667 | p->p_nice = NZERO; |
687880f9 | 668 | |
8429d022 | 669 | if (prop & SA_CONT) |
f4af9a5b | 670 | p->p_sig &= ~stopsigmask; |
f4af9a5b | 671 | |
8429d022 | 672 | if (prop & SA_STOP) { |
faf9c963 MK |
673 | /* |
674 | * If sending a tty stop signal to a member of an orphaned | |
675 | * process group, discard the signal here if the action | |
676 | * is default; don't stop the process below if sleeping, | |
677 | * and don't clear any pending SIGCONT. | |
678 | */ | |
8429d022 MK |
679 | if (prop & SA_TTYSTOP && p->p_pgrp->pg_jobc == 0 && |
680 | action == SIG_DFL) | |
9db58063 | 681 | return; |
8429d022 | 682 | p->p_sig &= ~contsigmask; |
687880f9 | 683 | } |
f4af9a5b MK |
684 | p->p_sig |= mask; |
685 | ||
687880f9 | 686 | /* |
f4af9a5b MK |
687 | * Defer further processing for signals which are held, |
688 | * except that stopped processes must be continued by SIGCONT. | |
687880f9 | 689 | */ |
8429d022 | 690 | if (action == SIG_HOLD && ((prop & SA_CONT) == 0 || p->p_stat != SSTOP)) |
687880f9 | 691 | return; |
feff6b5a | 692 | s = splhigh(); |
687880f9 BJ |
693 | switch (p->p_stat) { |
694 | ||
695 | case SSLEEP: | |
696 | /* | |
22585170 | 697 | * If process is sleeping uninterruptibly |
687880f9 BJ |
698 | * we can't interrupt the sleep... the signal will |
699 | * be noticed when the process returns through | |
700 | * trap() or syscall(). | |
701 | */ | |
22585170 | 702 | if ((p->p_flag & SSINTR) == 0) |
687880f9 BJ |
703 | goto out; |
704 | /* | |
705 | * Process is sleeping and traced... make it runnable | |
706 | * so it can discover the signal in issig() and stop | |
707 | * for the parent. | |
708 | */ | |
90f62fff | 709 | if (p->p_flag & STRC) |
687880f9 | 710 | goto run; |
90f62fff KM |
711 | /* |
712 | * If SIGCONT is default (or ignored) and process is | |
713 | * asleep, we are finished; the process should not | |
714 | * be awakened. | |
715 | */ | |
716 | if ((prop & SA_CONT) && action == SIG_DFL) { | |
717 | p->p_sig &= ~mask; | |
718 | goto out; | |
719 | } | |
f4af9a5b MK |
720 | /* |
721 | * When a sleeping process receives a stop | |
722 | * signal, process immediately if possible. | |
723 | * All other (caught or default) signals | |
724 | * cause the process to run. | |
725 | */ | |
8429d022 | 726 | if (prop & SA_STOP) { |
687880f9 | 727 | if (action != SIG_DFL) |
f4af9a5b | 728 | goto runfast; |
687880f9 | 729 | /* |
8429d022 MK |
730 | * If a child holding parent blocked, |
731 | * stopping could cause deadlock. | |
687880f9 | 732 | */ |
90f62fff | 733 | if (p->p_flag & SPPWAIT) |
687880f9 | 734 | goto out; |
feff6b5a | 735 | p->p_sig &= ~mask; |
19dec745 | 736 | p->p_xstat = sig; |
f4af9a5b MK |
737 | if ((p->p_pptr->p_flag & SNOCLDSTOP) == 0) |
738 | psignal(p->p_pptr, SIGCHLD); | |
687880f9 BJ |
739 | stop(p); |
740 | goto out; | |
f4af9a5b MK |
741 | } else |
742 | goto runfast; | |
687880f9 BJ |
743 | /*NOTREACHED*/ |
744 | ||
745 | case SSTOP: | |
746 | /* | |
747 | * If traced process is already stopped, | |
748 | * then no further action is necessary. | |
749 | */ | |
90f62fff | 750 | if (p->p_flag & STRC) |
687880f9 | 751 | goto out; |
687880f9 | 752 | |
8429d022 MK |
753 | /* |
754 | * Kill signal always sets processes running. | |
755 | */ | |
756 | if (sig == SIGKILL) | |
f4af9a5b | 757 | goto runfast; |
687880f9 | 758 | |
8429d022 | 759 | if (prop & SA_CONT) { |
687880f9 | 760 | /* |
f4af9a5b MK |
761 | * If SIGCONT is default (or ignored), we continue |
762 | * the process but don't leave the signal in p_sig, | |
763 | * as it has no further action. If SIGCONT is held, | |
764 | * continue the process and leave the signal in p_sig. | |
687880f9 BJ |
765 | * If the process catches SIGCONT, let it handle |
766 | * the signal itself. If it isn't waiting on | |
767 | * an event, then it goes back to run state. | |
768 | * Otherwise, process goes back to sleep state. | |
769 | */ | |
f4af9a5b MK |
770 | if (action == SIG_DFL) |
771 | p->p_sig &= ~mask; | |
772 | if (action == SIG_CATCH) | |
773 | goto runfast; | |
774 | if (p->p_wchan == 0) | |
687880f9 BJ |
775 | goto run; |
776 | p->p_stat = SSLEEP; | |
777 | goto out; | |
8429d022 | 778 | } |
687880f9 | 779 | |
8429d022 | 780 | if (prop & SA_STOP) { |
687880f9 BJ |
781 | /* |
782 | * Already stopped, don't need to stop again. | |
783 | * (If we did the shell could get confused.) | |
784 | */ | |
feff6b5a | 785 | p->p_sig &= ~mask; /* take it away */ |
687880f9 | 786 | goto out; |
687880f9 | 787 | } |
8429d022 MK |
788 | |
789 | /* | |
790 | * If process is sleeping interruptibly, then | |
791 | * simulate a wakeup so that when it is continued, | |
792 | * it will be made runnable and can look at the signal. | |
793 | * But don't setrun the process, leave it stopped. | |
794 | */ | |
795 | if (p->p_wchan && p->p_flag & SSINTR) | |
796 | unsleep(p); | |
797 | goto out; | |
687880f9 BJ |
798 | |
799 | default: | |
800 | /* | |
801 | * SRUN, SIDL, SZOMB do nothing with the signal, | |
802 | * other than kicking ourselves if we are running. | |
803 | * It will either never be noticed, or noticed very soon. | |
804 | */ | |
35493b0f | 805 | if (p == curproc) |
8e6cd807 | 806 | signotify(p); |
687880f9 BJ |
807 | goto out; |
808 | } | |
809 | /*NOTREACHED*/ | |
f4af9a5b MK |
810 | |
811 | runfast: | |
687880f9 BJ |
812 | /* |
813 | * Raise priority to at least PUSER. | |
814 | */ | |
815 | if (p->p_pri > PUSER) | |
e4f89871 | 816 | p->p_pri = PUSER; |
f4af9a5b | 817 | run: |
687880f9 BJ |
818 | setrun(p); |
819 | out: | |
820 | splx(s); | |
821 | } | |
822 | ||
823 | /* | |
22585170 MT |
824 | * If the current process has a signal to process (should be caught |
825 | * or cause termination, should interrupt current syscall), | |
826 | * return the signal number. Stop signals with default action | |
827 | * are processed immediately, then cleared; they aren't returned. | |
8429d022 MK |
828 | * This is checked after each entry to the system for a syscall |
829 | * or trap (though this can usually be done without actually calling | |
830 | * issig by checking the pending signal masks in the CURSIG macro.) | |
831 | * The normal call sequence is | |
832 | * | |
833 | * while (sig = CURSIG(curproc)) | |
834 | * psig(sig); | |
687880f9 | 835 | */ |
8429d022 MK |
836 | issig(p) |
837 | register struct proc *p; | |
687880f9 | 838 | { |
8429d022 | 839 | register int sig, mask, prop; |
687880f9 | 840 | |
687880f9 | 841 | for (;;) { |
f4af9a5b | 842 | mask = p->p_sig &~ p->p_sigmask; |
90f62fff | 843 | if (p->p_flag & SPPWAIT) |
f4af9a5b | 844 | mask &= ~stopsigmask; |
22585170 MT |
845 | if (mask == 0) /* no signal to send */ |
846 | return (0); | |
f4af9a5b | 847 | sig = ffs((long)mask); |
feff6b5a | 848 | mask = sigmask(sig); |
8429d022 | 849 | prop = sigprop[sig]; |
22585170 MT |
850 | /* |
851 | * We should see pending but ignored signals | |
852 | * only if STRC was on when they were posted. | |
853 | */ | |
90f62fff | 854 | if (mask & p->p_sigignore && (p->p_flag & STRC) == 0) { |
22585170 MT |
855 | p->p_sig &= ~mask; |
856 | continue; | |
857 | } | |
90f62fff | 858 | if (p->p_flag & STRC && (p->p_flag & SPPWAIT) == 0) { |
687880f9 BJ |
859 | /* |
860 | * If traced, always stop, and stay | |
861 | * stopped until released by the parent. | |
862 | */ | |
19dec745 | 863 | p->p_xstat = sig; |
ad6c75cb | 864 | psignal(p->p_pptr, SIGCHLD); |
687880f9 BJ |
865 | do { |
866 | stop(p); | |
867 | swtch(); | |
90f62fff | 868 | } while (!procxmt(p) && p->p_flag & STRC); |
687880f9 BJ |
869 | |
870 | /* | |
f99e4a3a | 871 | * If the traced bit got turned off, |
22585170 | 872 | * go back up to the top to rescan signals. |
35493b0f MK |
873 | * This ensures that p_sig* and ps_sigact |
874 | * are consistent. | |
687880f9 | 875 | */ |
90f62fff | 876 | if ((p->p_flag & STRC) == 0) |
687880f9 | 877 | continue; |
687880f9 BJ |
878 | |
879 | /* | |
880 | * If parent wants us to take the signal, | |
19dec745 | 881 | * then it will leave it in p->p_xstat; |
687880f9 BJ |
882 | * otherwise we just look for signals again. |
883 | */ | |
22585170 | 884 | p->p_sig &= ~mask; /* clear the old signal */ |
19dec745 | 885 | sig = p->p_xstat; |
687880f9 BJ |
886 | if (sig == 0) |
887 | continue; | |
f99e4a3a SL |
888 | |
889 | /* | |
22585170 MT |
890 | * Put the new signal into p_sig. |
891 | * If signal is being masked, | |
892 | * look for other signals. | |
f99e4a3a | 893 | */ |
feff6b5a | 894 | mask = sigmask(sig); |
22585170 MT |
895 | p->p_sig |= mask; |
896 | if (p->p_sigmask & mask) | |
f99e4a3a | 897 | continue; |
687880f9 | 898 | } |
22585170 MT |
899 | |
900 | /* | |
901 | * Decide whether the signal should be returned. | |
902 | * Return the signal's number, or fall through | |
903 | * to clear it from the pending mask. | |
904 | */ | |
8429d022 | 905 | switch ((int)p->p_sigacts->ps_sigact[sig]) { |
687880f9 BJ |
906 | |
907 | case SIG_DFL: | |
908 | /* | |
909 | * Don't take default actions on system processes. | |
910 | */ | |
fc080d8d RC |
911 | if (p->p_pid <= 1) { |
912 | #ifdef DIAGNOSTIC | |
913 | /* | |
914 | * Are you sure you want to ignore SIGSEGV | |
915 | * in init? XXX | |
916 | */ | |
917 | printf("Process (pid %d) got signal %d\n", | |
918 | p->p_pid, sig); | |
919 | #endif | |
22585170 | 920 | break; /* == ignore */ |
fc080d8d | 921 | } |
22585170 MT |
922 | /* |
923 | * If there is a pending stop signal to process | |
924 | * with default action, stop here, | |
e51c8e4a MK |
925 | * then clear the signal. However, |
926 | * if process is member of an orphaned | |
927 | * process group, ignore tty stop signals. | |
22585170 | 928 | */ |
8429d022 | 929 | if (prop & SA_STOP) { |
90f62fff | 930 | if (p->p_flag & STRC || |
e51c8e4a | 931 | (p->p_pgrp->pg_jobc == 0 && |
8429d022 | 932 | prop & SA_TTYSTOP)) |
22585170 | 933 | break; /* == ignore */ |
19dec745 | 934 | p->p_xstat = sig; |
687880f9 | 935 | stop(p); |
f4af9a5b MK |
936 | if ((p->p_pptr->p_flag & SNOCLDSTOP) == 0) |
937 | psignal(p->p_pptr, SIGCHLD); | |
687880f9 | 938 | swtch(); |
22585170 | 939 | break; |
8429d022 | 940 | } else if (prop & SA_IGNORE) { |
687880f9 | 941 | /* |
f4af9a5b MK |
942 | * Except for SIGCONT, shouldn't get here. |
943 | * Default action is to ignore; drop it. | |
687880f9 | 944 | */ |
22585170 | 945 | break; /* == ignore */ |
f4af9a5b | 946 | } else |
22585170 | 947 | return (sig); |
687880f9 BJ |
948 | /*NOTREACHED*/ |
949 | ||
687880f9 BJ |
950 | case SIG_IGN: |
951 | /* | |
f4af9a5b MK |
952 | * Masking above should prevent us ever trying |
953 | * to take action on an ignored signal other | |
954 | * than SIGCONT, unless process is traced. | |
687880f9 | 955 | */ |
90f62fff | 956 | if ((prop & SA_CONT) == 0 && (p->p_flag & STRC) == 0) |
687880f9 | 957 | printf("issig\n"); |
22585170 | 958 | break; /* == ignore */ |
687880f9 BJ |
959 | |
960 | default: | |
961 | /* | |
962 | * This signal has an action, let | |
963 | * psig process it. | |
964 | */ | |
22585170 | 965 | return (sig); |
687880f9 | 966 | } |
22585170 | 967 | p->p_sig &= ~mask; /* take the signal! */ |
687880f9 | 968 | } |
22585170 | 969 | /* NOTREACHED */ |
687880f9 BJ |
970 | } |
971 | ||
687880f9 BJ |
972 | /* |
973 | * Put the argument process into the stopped | |
ad6c75cb MK |
974 | * state and notify the parent via wakeup. |
975 | * Signals are handled elsewhere. | |
22585170 | 976 | * The process must not be on the run queue. |
687880f9 BJ |
977 | */ |
978 | stop(p) | |
979 | register struct proc *p; | |
980 | { | |
981 | ||
982 | p->p_stat = SSTOP; | |
983 | p->p_flag &= ~SWTED; | |
984 | wakeup((caddr_t)p->p_pptr); | |
687880f9 BJ |
985 | } |
986 | ||
987 | /* | |
8429d022 MK |
988 | * Take the action for the specified signal |
989 | * from the current set of pending signals. | |
687880f9 | 990 | */ |
8429d022 | 991 | void |
22585170 MT |
992 | psig(sig) |
993 | register int sig; | |
687880f9 | 994 | { |
8429d022 MK |
995 | register struct proc *p = curproc; |
996 | register struct sigacts *ps = p->p_sigacts; | |
f4af9a5b | 997 | register sig_t action; |
8429d022 | 998 | int mask, returnmask; |
f4af9a5b | 999 | |
22585170 | 1000 | #ifdef DIAGNOSTIC |
8429d022 MK |
1001 | if (sig == 0) |
1002 | panic("psig"); | |
22585170 | 1003 | #endif |
8429d022 MK |
1004 | mask = sigmask(sig); |
1005 | p->p_sig &= ~mask; | |
1006 | action = ps->ps_sigact[sig]; | |
22585170 | 1007 | #ifdef KTRACE |
8429d022 | 1008 | if (KTRPOINT(p, KTR_PSIG)) |
ebf08548 | 1009 | ktrpsig(p->p_tracep, sig, action, ps->ps_flags & SAS_OLDMASK ? |
8429d022 | 1010 | ps->ps_oldmask : p->p_sigmask, 0); |
22585170 | 1011 | #endif |
8429d022 MK |
1012 | if (action == SIG_DFL) { |
1013 | /* | |
1014 | * Default action, where the default is to kill | |
1015 | * the process. (Other cases were ignored above.) | |
8429d022 | 1016 | */ |
35493b0f | 1017 | sigexit(p, sig); |
8429d022 MK |
1018 | /* NOTREACHED */ |
1019 | } else { | |
1020 | /* | |
1021 | * If we get here, the signal must be caught. | |
1022 | */ | |
f4af9a5b | 1023 | #ifdef DIAGNOSTIC |
8429d022 MK |
1024 | if (action == SIG_IGN || (p->p_sigmask & mask)) |
1025 | panic("psig action"); | |
f4af9a5b | 1026 | #endif |
8429d022 MK |
1027 | /* |
1028 | * Set the new mask value and also defer further | |
1029 | * occurences of this signal. | |
1030 | * | |
1031 | * Special case: user has done a sigpause. Here the | |
1032 | * current mask is not of interest, but rather the | |
1033 | * mask from before the sigpause is what we want | |
1034 | * restored after the signal processing is completed. | |
1035 | */ | |
1036 | (void) splhigh(); | |
ebf08548 | 1037 | if (ps->ps_flags & SAS_OLDMASK) { |
8429d022 | 1038 | returnmask = ps->ps_oldmask; |
ebf08548 | 1039 | ps->ps_flags &= ~SAS_OLDMASK; |
8429d022 MK |
1040 | } else |
1041 | returnmask = p->p_sigmask; | |
1042 | p->p_sigmask |= ps->ps_catchmask[sig] | mask; | |
1043 | (void) spl0(); | |
1044 | p->p_stats->p_ru.ru_nsignals++; | |
8429d022 | 1045 | sendsig(action, sig, returnmask, 0); |
8429d022 | 1046 | } |
687880f9 BJ |
1047 | } |
1048 | ||
055fc5f3 KM |
1049 | /* |
1050 | * Kill the current process for stated reason. | |
1051 | */ | |
1052 | killproc(p, why) | |
1053 | struct proc *p; | |
1054 | char *why; | |
1055 | { | |
1056 | ||
1057 | log(LOG_ERR, "pid %d was killed: %s\n", p->p_pid, why); | |
1058 | uprintf("sorry, pid %d was killed: %s\n", p->p_pid, why); | |
1059 | psignal(p, SIGKILL); | |
1060 | } | |
1061 | ||
35493b0f MK |
1062 | /* |
1063 | * Force the current process to exit with the specified | |
1064 | * signal, dumping core if appropriate. We bypass the normal | |
1065 | * tests for masked and caught signals, allowing unrecoverable | |
1066 | * failures to terminate the process without changing signal state. | |
1067 | * Mark the accounting record with the signal termination. | |
1068 | * If dumping core, save the signal number for the debugger. | |
1069 | * Calls exit and does not return. | |
1070 | */ | |
1071 | sigexit(p, sig) | |
1072 | register struct proc *p; | |
1073 | int sig; | |
1074 | { | |
1075 | ||
1076 | p->p_acflag |= AXSIG; | |
1077 | if (sigprop[sig] & SA_CORE) { | |
1078 | p->p_sigacts->ps_sig = sig; | |
1079 | if (coredump(p) == 0) | |
1080 | sig |= WCOREFLAG; | |
1081 | } | |
817f339a | 1082 | exit1(p, W_EXITCODE(0, sig)); |
35493b0f MK |
1083 | /* NOTREACHED */ |
1084 | } | |
1085 | ||
687880f9 | 1086 | /* |
8429d022 | 1087 | * Create a core dump. |
bdb4bae9 | 1088 | * The file name is "core.progname". |
a91cddfd | 1089 | * Core dumps are not created if the process is setuid. |
687880f9 | 1090 | */ |
8429d022 MK |
1091 | coredump(p) |
1092 | register struct proc *p; | |
687880f9 | 1093 | { |
c4ec2128 | 1094 | register struct vnode *vp; |
8429d022 MK |
1095 | register struct pcred *pcred = p->p_cred; |
1096 | register struct ucred *cred = pcred->pc_ucred; | |
1097 | register struct vmspace *vm = p->p_vmspace; | |
d86a61ec | 1098 | struct vattr vattr; |
79583d0d | 1099 | int error, error1; |
8429d022 | 1100 | struct nameidata nd; |
bdb4bae9 | 1101 | char name[MAXCOMLEN+6]; /* core.progname */ |
687880f9 | 1102 | |
8429d022 MK |
1103 | if (pcred->p_svuid != pcred->p_ruid || |
1104 | pcred->p_svgid != pcred->p_rgid) | |
d86a61ec | 1105 | return (EFAULT); |
8429d022 MK |
1106 | if (ctob(UPAGES + vm->vm_dsize + vm->vm_ssize) >= |
1107 | p->p_rlimit[RLIMIT_CORE].rlim_cur) | |
d86a61ec | 1108 | return (EFAULT); |
bdb4bae9 | 1109 | sprintf(name, "core.%s", p->p_comm); |
0c9db509 JH |
1110 | NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, name, p); |
1111 | if (error = vn_open(&nd, O_CREAT|FWRITE, 0644)) | |
d86a61ec | 1112 | return (error); |
8429d022 | 1113 | vp = nd.ni_vp; |
6bcdc4f3 | 1114 | if (vp->v_type != VREG || VOP_GETATTR(vp, &vattr, cred, p) || |
d86a61ec | 1115 | vattr.va_nlink != 1) { |
79583d0d KM |
1116 | error = EFAULT; |
1117 | goto out; | |
7b0cb7cb | 1118 | } |
3ee1461b | 1119 | VATTR_NULL(&vattr); |
d86a61ec | 1120 | vattr.va_size = 0; |
4fcc40ae | 1121 | LEASE_CHECK(vp, p, cred, LEASE_WRITE); |
6bcdc4f3 | 1122 | VOP_SETATTR(vp, &vattr, cred, p); |
8429d022 | 1123 | p->p_acflag |= ACORE; |
8e6cd807 MK |
1124 | bcopy(p, &p->p_addr->u_kproc.kp_proc, sizeof(struct proc)); |
1125 | fill_eproc(p, &p->p_addr->u_kproc.kp_eproc); | |
7b2c7fa0 | 1126 | error = cpu_coredump(p, vp, cred); |
d86a61ec | 1127 | if (error == 0) |
8429d022 MK |
1128 | error = vn_rdwr(UIO_WRITE, vp, vm->vm_daddr, |
1129 | (int)ctob(vm->vm_dsize), (off_t)ctob(UPAGES), UIO_USERSPACE, | |
8e6cd807 | 1130 | IO_NODELOCKED|IO_UNIT, cred, (int *) NULL, p); |
d86a61ec KM |
1131 | if (error == 0) |
1132 | error = vn_rdwr(UIO_WRITE, vp, | |
8e6cd807 | 1133 | (caddr_t) trunc_page(USRSTACK - ctob(vm->vm_ssize)), |
8429d022 MK |
1134 | round_page(ctob(vm->vm_ssize)), |
1135 | (off_t)ctob(UPAGES) + ctob(vm->vm_dsize), UIO_USERSPACE, | |
8e6cd807 | 1136 | IO_NODELOCKED|IO_UNIT, cred, (int *) NULL, p); |
79583d0d KM |
1137 | out: |
1138 | VOP_UNLOCK(vp); | |
1139 | error1 = vn_close(vp, FWRITE, cred, p); | |
bdb4bae9 | 1140 | if (error == 0) |
79583d0d | 1141 | error = error1; |
d86a61ec | 1142 | return (error); |
687880f9 | 1143 | } |
f4af9a5b MK |
1144 | |
1145 | /* | |
1146 | * Nonexistent system call-- signal process (may want to handle it). | |
1147 | * Flag error in case process won't see signal immediately (blocked or ignored). | |
1148 | */ | |
9e97623a CT |
1149 | struct nosys_args { |
1150 | int dummy; | |
1151 | }; | |
8eea23a6 KM |
1152 | /* ARGSUSED */ |
1153 | nosys(p, args, retval) | |
1154 | struct proc *p; | |
9e97623a | 1155 | struct nosys_args *args; |
8eea23a6 | 1156 | int *retval; |
f4af9a5b MK |
1157 | { |
1158 | ||
8eea23a6 | 1159 | psignal(p, SIGSYS); |
d9c2f47f | 1160 | return (EINVAL); |
f4af9a5b | 1161 | } |