Commit | Line | Data |
---|---|---|
da7c5cc6 | 1 | /* |
c34daa85 KB |
2 | * Copyright (c) 1982, 1986, 1989, 1991, 1993 |
3 | * The Regents of the University of California. All rights reserved. | |
da7c5cc6 | 4 | * |
dbf0c423 | 5 | * %sccs.include.redist.c% |
d86a61ec | 6 | * |
802236f4 | 7 | * @(#)kern_sig.c 8.2 (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> |
802236f4 | 27 | #include <sys/stat.h> |
687880f9 | 28 | |
38a01dbe | 29 | #include <machine/cpu.h> |
8e6cd807 | 30 | |
38a01dbe | 31 | #include <vm/vm.h> |
38a01dbe | 32 | #include <sys/user.h> /* for coredump */ |
d301d150 | 33 | |
2e143991 | 34 | /* |
802236f4 | 35 | * Can process p, with pcred pc, send the signal signum to process q? |
2e143991 | 36 | */ |
802236f4 | 37 | #define CANSIGNAL(p, pc, q, signum) \ |
8429d022 MK |
38 | ((pc)->pc_ucred->cr_uid == 0 || \ |
39 | (pc)->p_ruid == (q)->p_cred->p_ruid || \ | |
40 | (pc)->pc_ucred->cr_uid == (q)->p_cred->p_ruid || \ | |
41 | (pc)->p_ruid == (q)->p_ucred->cr_uid || \ | |
42 | (pc)->pc_ucred->cr_uid == (q)->p_ucred->cr_uid || \ | |
802236f4 | 43 | ((signum) == SIGCONT && (q)->p_session == (p)->p_session)) |
e635a749 | 44 | |
9e97623a | 45 | struct sigaction_args { |
802236f4 | 46 | int signum; |
9e97623a CT |
47 | struct sigaction *nsa; |
48 | struct sigaction *osa; | |
49 | }; | |
e635a749 MK |
50 | /* ARGSUSED */ |
51 | sigaction(p, uap, retval) | |
52 | struct proc *p; | |
9e97623a | 53 | register struct sigaction_args *uap; |
e635a749 MK |
54 | int *retval; |
55 | { | |
f4af9a5b MK |
56 | struct sigaction vec; |
57 | register struct sigaction *sa; | |
8429d022 | 58 | register struct sigacts *ps = p->p_sigacts; |
802236f4 | 59 | register int signum; |
f4af9a5b | 60 | int bit, error; |
dd012d1e | 61 | |
802236f4 KB |
62 | signum = uap->signum; |
63 | if (signum <= 0 || signum >= NSIG || | |
64 | signum == SIGKILL || signum == SIGSTOP) | |
d9c2f47f | 65 | return (EINVAL); |
f4af9a5b MK |
66 | sa = &vec; |
67 | if (uap->osa) { | |
802236f4 KB |
68 | sa->sa_handler = ps->ps_sigact[signum]; |
69 | sa->sa_mask = ps->ps_catchmask[signum]; | |
70 | bit = sigmask(signum); | |
f4af9a5b | 71 | sa->sa_flags = 0; |
8429d022 | 72 | if ((ps->ps_sigonstack & bit) != 0) |
f4af9a5b | 73 | sa->sa_flags |= SA_ONSTACK; |
8429d022 | 74 | if ((ps->ps_sigintr & bit) == 0) |
f4af9a5b | 75 | sa->sa_flags |= SA_RESTART; |
e635a749 | 76 | if (p->p_flag & SNOCLDSTOP) |
f4af9a5b MK |
77 | sa->sa_flags |= SA_NOCLDSTOP; |
78 | if (error = copyout((caddr_t)sa, (caddr_t)uap->osa, | |
79 | sizeof (vec))) | |
d9c2f47f | 80 | return (error); |
457aa395 | 81 | } |
f4af9a5b MK |
82 | if (uap->nsa) { |
83 | if (error = copyin((caddr_t)uap->nsa, (caddr_t)sa, | |
84 | sizeof (vec))) | |
d9c2f47f | 85 | return (error); |
802236f4 | 86 | setsigvec(p, signum, sa); |
457aa395 | 87 | } |
d9c2f47f | 88 | return (0); |
dd012d1e | 89 | } |
4147b3f6 | 90 | |
802236f4 | 91 | setsigvec(p, signum, sa) |
e635a749 | 92 | register struct proc *p; |
802236f4 | 93 | int signum; |
f4af9a5b | 94 | register struct sigaction *sa; |
dd012d1e | 95 | { |
8429d022 | 96 | register struct sigacts *ps = p->p_sigacts; |
457aa395 | 97 | register int bit; |
dd012d1e | 98 | |
802236f4 | 99 | bit = sigmask(signum); |
dd012d1e SL |
100 | /* |
101 | * Change setting atomically. | |
102 | */ | |
feff6b5a | 103 | (void) splhigh(); |
802236f4 KB |
104 | ps->ps_sigact[signum] = sa->sa_handler; |
105 | ps->ps_catchmask[signum] = sa->sa_mask &~ sigcantmask; | |
f4af9a5b | 106 | if ((sa->sa_flags & SA_RESTART) == 0) |
8429d022 | 107 | ps->ps_sigintr |= bit; |
fe7f81f4 | 108 | else |
8429d022 | 109 | ps->ps_sigintr &= ~bit; |
f4af9a5b | 110 | if (sa->sa_flags & SA_ONSTACK) |
8429d022 | 111 | ps->ps_sigonstack |= bit; |
457aa395 | 112 | else |
8429d022 | 113 | ps->ps_sigonstack &= ~bit; |
0cbc4437 CT |
114 | #ifdef COMPAT_SUNOS |
115 | if (sa->sa_flags & SA_USERTRAMP) | |
116 | ps->ps_usertramp |= bit; | |
117 | else | |
118 | ps->ps_usertramp &= ~bit; | |
119 | #endif | |
802236f4 | 120 | if (signum == SIGCHLD) { |
f4af9a5b MK |
121 | if (sa->sa_flags & SA_NOCLDSTOP) |
122 | p->p_flag |= SNOCLDSTOP; | |
123 | else | |
124 | p->p_flag &= ~SNOCLDSTOP; | |
125 | } | |
126 | /* | |
127 | * Set bit in p_sigignore for signals that are set to SIG_IGN, | |
128 | * and for signals set to SIG_DFL where the default is to ignore. | |
129 | * However, don't put SIGCONT in p_sigignore, | |
130 | * as we have to restart the process. | |
131 | */ | |
132 | if (sa->sa_handler == SIG_IGN || | |
802236f4 | 133 | (sigprop[signum] & SA_IGNORE && sa->sa_handler == SIG_DFL)) { |
457aa395 | 134 | p->p_sig &= ~bit; /* never to be seen again */ |
802236f4 | 135 | if (signum != SIGCONT) |
f4af9a5b | 136 | p->p_sigignore |= bit; /* easier in psignal */ |
457aa395 | 137 | p->p_sigcatch &= ~bit; |
dd012d1e | 138 | } else { |
457aa395 | 139 | p->p_sigignore &= ~bit; |
f4af9a5b | 140 | if (sa->sa_handler == SIG_DFL) |
457aa395 | 141 | p->p_sigcatch &= ~bit; |
dd012d1e | 142 | else |
457aa395 | 143 | p->p_sigcatch |= bit; |
dd012d1e SL |
144 | } |
145 | (void) spl0(); | |
4147b3f6 BJ |
146 | } |
147 | ||
f4af9a5b MK |
148 | /* |
149 | * Initialize signal state for process 0; | |
150 | * set to ignore signals that are ignored by default. | |
151 | */ | |
8429d022 | 152 | void |
f4af9a5b MK |
153 | siginit(p) |
154 | struct proc *p; | |
155 | { | |
8429d022 | 156 | register int i; |
f4af9a5b | 157 | |
8429d022 MK |
158 | for (i = 0; i < NSIG; i++) |
159 | if (sigprop[i] & SA_IGNORE && i != SIGCONT) | |
160 | p->p_sigignore |= sigmask(i); | |
f4af9a5b MK |
161 | } |
162 | ||
163 | /* | |
164 | * Reset signals for an exec of the specified process. | |
165 | */ | |
8429d022 | 166 | void |
f4af9a5b MK |
167 | execsigs(p) |
168 | register struct proc *p; | |
169 | { | |
8429d022 | 170 | register struct sigacts *ps = p->p_sigacts; |
f4af9a5b MK |
171 | register int nc, mask; |
172 | ||
173 | /* | |
174 | * Reset caught signals. Held signals remain held | |
175 | * through p_sigmask (unless they were caught, | |
176 | * and are now ignored by default). | |
177 | */ | |
178 | while (p->p_sigcatch) { | |
179 | nc = ffs((long)p->p_sigcatch); | |
180 | mask = sigmask(nc); | |
181 | p->p_sigcatch &= ~mask; | |
8429d022 | 182 | if (sigprop[nc] & SA_IGNORE) { |
f4af9a5b MK |
183 | if (nc != SIGCONT) |
184 | p->p_sigignore |= mask; | |
185 | p->p_sig &= ~mask; | |
186 | } | |
8429d022 | 187 | ps->ps_sigact[nc] = SIG_DFL; |
f4af9a5b MK |
188 | } |
189 | /* | |
190 | * Reset stack state to the user stack. | |
191 | * Clear set of signals caught on the signal stack. | |
192 | */ | |
ebf08548 KM |
193 | ps->ps_sigstk.ss_flags = SA_DISABLE; |
194 | ps->ps_sigstk.ss_size = 0; | |
195 | ps->ps_sigstk.ss_base = 0; | |
196 | ps->ps_flags = 0; | |
f4af9a5b MK |
197 | } |
198 | ||
199 | /* | |
200 | * Manipulate signal mask. | |
201 | * Note that we receive new mask, not pointer, | |
202 | * and return old mask as return value; | |
203 | * the library stub does the rest. | |
204 | */ | |
9e97623a CT |
205 | struct sigprocmask_args { |
206 | int how; | |
207 | sigset_t mask; | |
208 | }; | |
e635a749 MK |
209 | sigprocmask(p, uap, retval) |
210 | register struct proc *p; | |
9e97623a | 211 | struct sigprocmask_args *uap; |
e635a749 MK |
212 | int *retval; |
213 | { | |
f4af9a5b MK |
214 | int error = 0; |
215 | ||
e635a749 | 216 | *retval = p->p_sigmask; |
f4af9a5b MK |
217 | (void) splhigh(); |
218 | ||
219 | switch (uap->how) { | |
220 | case SIG_BLOCK: | |
221 | p->p_sigmask |= uap->mask &~ sigcantmask; | |
222 | break; | |
223 | ||
224 | case SIG_UNBLOCK: | |
225 | p->p_sigmask &= ~uap->mask; | |
226 | break; | |
227 | ||
228 | case SIG_SETMASK: | |
229 | p->p_sigmask = uap->mask &~ sigcantmask; | |
230 | break; | |
231 | ||
232 | default: | |
233 | error = EINVAL; | |
234 | break; | |
235 | } | |
236 | (void) spl0(); | |
d9c2f47f | 237 | return (error); |
f4af9a5b MK |
238 | } |
239 | ||
9e97623a CT |
240 | struct sigpending_args { |
241 | int dummy; | |
242 | }; | |
e635a749 MK |
243 | /* ARGSUSED */ |
244 | sigpending(p, uap, retval) | |
245 | struct proc *p; | |
9e97623a | 246 | struct sigpending_args *uap; |
e635a749 | 247 | int *retval; |
f4af9a5b MK |
248 | { |
249 | ||
e635a749 | 250 | *retval = p->p_sig; |
d9c2f47f | 251 | return (0); |
f4af9a5b MK |
252 | } |
253 | ||
0cbc4437 | 254 | #if defined(COMPAT_43) || defined(COMPAT_SUNOS) |
f4af9a5b MK |
255 | /* |
256 | * Generalized interface signal handler, 4.3-compatible. | |
257 | */ | |
9e97623a | 258 | struct osigvec_args { |
802236f4 | 259 | int signum; |
9e97623a CT |
260 | struct sigvec *nsv; |
261 | struct sigvec *osv; | |
262 | }; | |
e635a749 MK |
263 | /* ARGSUSED */ |
264 | osigvec(p, uap, retval) | |
265 | struct proc *p; | |
9e97623a | 266 | register struct osigvec_args *uap; |
e635a749 MK |
267 | int *retval; |
268 | { | |
f4af9a5b | 269 | struct sigvec vec; |
8429d022 | 270 | register struct sigacts *ps = p->p_sigacts; |
f4af9a5b | 271 | register struct sigvec *sv; |
802236f4 | 272 | register int signum; |
f4af9a5b MK |
273 | int bit, error; |
274 | ||
802236f4 KB |
275 | signum = uap->signum; |
276 | if (signum <= 0 || signum >= NSIG || | |
277 | signum == SIGKILL || signum == SIGSTOP) | |
d9c2f47f | 278 | return (EINVAL); |
f4af9a5b MK |
279 | sv = &vec; |
280 | if (uap->osv) { | |
802236f4 KB |
281 | *(sig_t *)&sv->sv_handler = ps->ps_sigact[signum]; |
282 | sv->sv_mask = ps->ps_catchmask[signum]; | |
283 | bit = sigmask(signum); | |
f4af9a5b | 284 | sv->sv_flags = 0; |
8429d022 | 285 | if ((ps->ps_sigonstack & bit) != 0) |
f4af9a5b | 286 | sv->sv_flags |= SV_ONSTACK; |
8429d022 | 287 | if ((ps->ps_sigintr & bit) != 0) |
f4af9a5b | 288 | sv->sv_flags |= SV_INTERRUPT; |
0cbc4437 | 289 | #ifndef COMPAT_SUNOS |
e635a749 | 290 | if (p->p_flag & SNOCLDSTOP) |
f4af9a5b | 291 | sv->sv_flags |= SA_NOCLDSTOP; |
0cbc4437 | 292 | #endif |
f4af9a5b MK |
293 | if (error = copyout((caddr_t)sv, (caddr_t)uap->osv, |
294 | sizeof (vec))) | |
d9c2f47f | 295 | return (error); |
f4af9a5b MK |
296 | } |
297 | if (uap->nsv) { | |
298 | if (error = copyin((caddr_t)uap->nsv, (caddr_t)sv, | |
299 | sizeof (vec))) | |
d9c2f47f | 300 | return (error); |
0cbc4437 CT |
301 | #ifdef COMPAT_SUNOS |
302 | /* | |
0c1cfb60 KM |
303 | * SunOS uses this bit (4, aka SA_DISABLE) as SV_RESETHAND, |
304 | * `reset to SIG_DFL on delivery'. We have no such option | |
305 | * now or ever! | |
0cbc4437 | 306 | */ |
0c1cfb60 | 307 | if (sv->sv_flags & SA_DISABLE) |
0cbc4437 CT |
308 | return (EINVAL); |
309 | sv->sv_flags |= SA_USERTRAMP; | |
310 | #endif | |
f4af9a5b | 311 | sv->sv_flags ^= SA_RESTART; /* opposite of SV_INTERRUPT */ |
802236f4 | 312 | setsigvec(p, signum, (struct sigaction *)sv); |
f4af9a5b | 313 | } |
d9c2f47f | 314 | return (0); |
f4af9a5b MK |
315 | } |
316 | ||
9e97623a CT |
317 | struct osigblock_args { |
318 | int mask; | |
319 | }; | |
e635a749 MK |
320 | osigblock(p, uap, retval) |
321 | register struct proc *p; | |
9e97623a | 322 | struct osigblock_args *uap; |
e635a749 MK |
323 | int *retval; |
324 | { | |
4147b3f6 | 325 | |
feff6b5a | 326 | (void) splhigh(); |
e635a749 | 327 | *retval = p->p_sigmask; |
f4af9a5b | 328 | p->p_sigmask |= uap->mask &~ sigcantmask; |
dd012d1e | 329 | (void) spl0(); |
d9c2f47f | 330 | return (0); |
4147b3f6 BJ |
331 | } |
332 | ||
9e97623a CT |
333 | struct osigsetmask_args { |
334 | int mask; | |
335 | }; | |
e635a749 MK |
336 | osigsetmask(p, uap, retval) |
337 | struct proc *p; | |
9e97623a | 338 | struct osigsetmask_args *uap; |
e635a749 MK |
339 | int *retval; |
340 | { | |
687880f9 | 341 | |
feff6b5a | 342 | (void) splhigh(); |
e635a749 | 343 | *retval = p->p_sigmask; |
f4af9a5b | 344 | p->p_sigmask = uap->mask &~ sigcantmask; |
dd012d1e | 345 | (void) spl0(); |
d9c2f47f | 346 | return (0); |
687880f9 | 347 | } |
0c1cfb60 | 348 | #endif /* COMPAT_43 || COMPAT_SUNOS */ |
687880f9 | 349 | |
f4af9a5b MK |
350 | /* |
351 | * Suspend process until signal, providing mask to be set | |
352 | * in the meantime. Note nonstandard calling convention: | |
353 | * libc stub passes mask, not pointer, to save a copyin. | |
354 | */ | |
9e97623a CT |
355 | struct sigsuspend_args { |
356 | sigset_t mask; | |
357 | }; | |
e635a749 MK |
358 | /* ARGSUSED */ |
359 | sigsuspend(p, uap, retval) | |
360 | register struct proc *p; | |
9e97623a | 361 | struct sigsuspend_args *uap; |
e635a749 MK |
362 | int *retval; |
363 | { | |
8429d022 | 364 | register struct sigacts *ps = p->p_sigacts; |
4147b3f6 | 365 | |
dd012d1e SL |
366 | /* |
367 | * When returning from sigpause, we want | |
368 | * the old mask to be restored after the | |
369 | * signal handler has finished. Thus, we | |
5077c7b9 MK |
370 | * save it here and mark the sigacts structure |
371 | * to indicate this. | |
dd012d1e | 372 | */ |
8429d022 | 373 | ps->ps_oldmask = p->p_sigmask; |
ebf08548 | 374 | ps->ps_flags |= SAS_OLDMASK; |
f4af9a5b | 375 | p->p_sigmask = uap->mask &~ sigcantmask; |
92900edc KM |
376 | while (tsleep((caddr_t) ps, PPAUSE|PCATCH, "pause", 0) == 0) |
377 | /* void */; | |
22585170 | 378 | /* always return EINTR rather than ERESTART... */ |
d9c2f47f | 379 | return (EINTR); |
4147b3f6 BJ |
380 | } |
381 | ||
0c1cfb60 | 382 | #if defined(COMPAT_43) || defined(COMPAT_SUNOS) |
9e97623a CT |
383 | struct osigstack_args { |
384 | struct sigstack *nss; | |
385 | struct sigstack *oss; | |
386 | }; | |
e635a749 | 387 | /* ARGSUSED */ |
ebf08548 | 388 | osigstack(p, uap, retval) |
e635a749 | 389 | struct proc *p; |
9e97623a | 390 | register struct osigstack_args *uap; |
e635a749 MK |
391 | int *retval; |
392 | { | |
457aa395 | 393 | struct sigstack ss; |
ebf08548 | 394 | struct sigacts *psp; |
f4af9a5b MK |
395 | int error = 0; |
396 | ||
ebf08548 KM |
397 | psp = p->p_sigacts; |
398 | ss.ss_sp = psp->ps_sigstk.ss_base; | |
399 | ss.ss_onstack = psp->ps_sigstk.ss_flags & SA_ONSTACK; | |
400 | if (uap->oss && (error = copyout((caddr_t)&ss, (caddr_t)uap->oss, | |
401 | sizeof (struct sigstack)))) | |
d9c2f47f | 402 | return (error); |
f4af9a5b | 403 | if (uap->nss && (error = copyin((caddr_t)uap->nss, (caddr_t)&ss, |
ebf08548 KM |
404 | sizeof (ss))) == 0) { |
405 | psp->ps_sigstk.ss_base = ss.ss_sp; | |
406 | psp->ps_sigstk.ss_size = 0; | |
407 | psp->ps_sigstk.ss_flags |= ss.ss_onstack & SA_ONSTACK; | |
408 | psp->ps_flags |= SAS_ALTSTACK; | |
409 | } | |
d9c2f47f | 410 | return (error); |
4147b3f6 | 411 | } |
0c1cfb60 | 412 | #endif /* COMPAT_43 || COMPAT_SUNOS */ |
ebf08548 | 413 | |
9e97623a CT |
414 | struct sigaltstack_args { |
415 | struct sigaltstack *nss; | |
416 | struct sigaltstack *oss; | |
417 | }; | |
ebf08548 KM |
418 | /* ARGSUSED */ |
419 | sigaltstack(p, uap, retval) | |
420 | struct proc *p; | |
9e97623a | 421 | register struct sigaltstack_args *uap; |
ebf08548 KM |
422 | int *retval; |
423 | { | |
424 | struct sigacts *psp; | |
425 | struct sigaltstack ss; | |
426 | int error; | |
427 | ||
428 | psp = p->p_sigacts; | |
429 | if ((psp->ps_flags & SAS_ALTSTACK) == 0) | |
430 | psp->ps_sigstk.ss_flags |= SA_DISABLE; | |
431 | if (uap->oss && (error = copyout((caddr_t)&psp->ps_sigstk, | |
432 | (caddr_t)uap->oss, sizeof (struct sigaltstack)))) | |
433 | return (error); | |
d9a7fa42 KM |
434 | if (uap->nss == 0) |
435 | return (0); | |
436 | if (error = copyin((caddr_t)uap->nss, (caddr_t)&ss, sizeof (ss))) | |
ebf08548 KM |
437 | return (error); |
438 | if (ss.ss_flags & SA_DISABLE) { | |
439 | if (psp->ps_sigstk.ss_flags & SA_ONSTACK) | |
440 | return (EINVAL); | |
441 | psp->ps_flags &= ~SAS_ALTSTACK; | |
442 | psp->ps_sigstk.ss_flags = ss.ss_flags; | |
443 | return (0); | |
444 | } | |
445 | if (ss.ss_size < MINSIGSTKSZ) | |
446 | return (ENOMEM); | |
447 | psp->ps_flags |= SAS_ALTSTACK; | |
448 | psp->ps_sigstk= ss; | |
449 | return (0); | |
450 | } | |
4147b3f6 | 451 | |
9e97623a CT |
452 | struct kill_args { |
453 | int pid; | |
802236f4 | 454 | int signum; |
9e97623a | 455 | }; |
e635a749 MK |
456 | /* ARGSUSED */ |
457 | kill(cp, uap, retval) | |
458 | register struct proc *cp; | |
9e97623a | 459 | register struct kill_args *uap; |
e635a749 MK |
460 | int *retval; |
461 | { | |
7713be67 | 462 | register struct proc *p; |
8429d022 | 463 | register struct pcred *pc = cp->p_cred; |
1e3738da | 464 | |
802236f4 | 465 | if ((u_int)uap->signum >= NSIG) |
d9c2f47f | 466 | return (EINVAL); |
7713be67 KM |
467 | if (uap->pid > 0) { |
468 | /* kill single process */ | |
802236f4 | 469 | if ((p = pfind(uap->pid)) == NULL) |
d9c2f47f | 470 | return (ESRCH); |
802236f4 | 471 | if (!CANSIGNAL(cp, pc, p, uap->signum)) |
d9c2f47f | 472 | return (EPERM); |
802236f4 KB |
473 | if (uap->signum) |
474 | psignal(p, uap->signum); | |
d9c2f47f | 475 | return (0); |
7713be67 KM |
476 | } |
477 | switch (uap->pid) { | |
478 | case -1: /* broadcast signal */ | |
802236f4 | 479 | return (killpg1(cp, uap->signum, 0, 1)); |
7713be67 | 480 | case 0: /* signal own process group */ |
802236f4 | 481 | return (killpg1(cp, uap->signum, 0, 0)); |
7713be67 | 482 | default: /* negative explicit process group */ |
802236f4 | 483 | return (killpg1(cp, uap->signum, -uap->pid, 0)); |
7713be67 | 484 | } |
f4af9a5b | 485 | /* NOTREACHED */ |
1e3738da BJ |
486 | } |
487 | ||
0cbc4437 | 488 | #if defined(COMPAT_43) || defined(COMPAT_SUNOS) |
9e97623a CT |
489 | struct okillpg_args { |
490 | int pgid; | |
802236f4 | 491 | int signum; |
9e97623a | 492 | }; |
e635a749 MK |
493 | /* ARGSUSED */ |
494 | okillpg(p, uap, retval) | |
495 | struct proc *p; | |
9e97623a | 496 | register struct okillpg_args *uap; |
e635a749 MK |
497 | int *retval; |
498 | { | |
1e3738da | 499 | |
802236f4 | 500 | if ((u_int)uap->signum >= NSIG) |
d9c2f47f | 501 | return (EINVAL); |
802236f4 | 502 | return (killpg1(p, uap->signum, uap->pgid, 0)); |
1e3738da | 503 | } |
0c1cfb60 | 504 | #endif /* COMPAT_43 || COMPAT_SUNOS */ |
dd012d1e | 505 | |
e635a749 MK |
506 | /* |
507 | * Common code for kill process group/broadcast kill. | |
508 | * cp is calling process. | |
509 | */ | |
802236f4 | 510 | killpg1(cp, signum, pgid, all) |
e635a749 | 511 | register struct proc *cp; |
802236f4 | 512 | int signum, pgid, all; |
3b4f6e10 SL |
513 | { |
514 | register struct proc *p; | |
8429d022 | 515 | register struct pcred *pc = cp->p_cred; |
8fe87cbb | 516 | struct pgrp *pgrp; |
8429d022 | 517 | int nfound = 0; |
8fe87cbb MT |
518 | |
519 | if (all) | |
520 | /* | |
521 | * broadcast | |
687880f9 | 522 | */ |
80a8e5e6 | 523 | for (p = (struct proc *)allproc; p != NULL; p = p->p_nxt) { |
90f62fff | 524 | if (p->p_pid <= 1 || p->p_flag & SSYS || |
802236f4 | 525 | p == cp || !CANSIGNAL(cp, pc, p, signum)) |
8fe87cbb | 526 | continue; |
8429d022 | 527 | nfound++; |
802236f4 KB |
528 | if (signum) |
529 | psignal(p, signum); | |
8fe87cbb MT |
530 | } |
531 | else { | |
532 | if (pgid == 0) | |
533 | /* | |
534 | * zero pgid means send to my process group. | |
535 | */ | |
8429d022 | 536 | pgrp = cp->p_pgrp; |
8fe87cbb MT |
537 | else { |
538 | pgrp = pgfind(pgid); | |
539 | if (pgrp == NULL) | |
f4af9a5b | 540 | return (ESRCH); |
8fe87cbb | 541 | } |
8fe87cbb | 542 | for (p = pgrp->pg_mem; p != NULL; p = p->p_pgrpnxt) { |
90f62fff | 543 | if (p->p_pid <= 1 || p->p_flag & SSYS || |
802236f4 KB |
544 | p->p_stat == SZOMB || |
545 | !CANSIGNAL(cp, pc, p, signum)) | |
8fe87cbb | 546 | continue; |
8429d022 | 547 | nfound++; |
802236f4 KB |
548 | if (signum) |
549 | psignal(p, signum); | |
7713be67 | 550 | } |
687880f9 | 551 | } |
8429d022 | 552 | return (nfound ? 0 : ESRCH); |
4147b3f6 | 553 | } |
687880f9 | 554 | |
e635a749 | 555 | /* |
802236f4 | 556 | * Send a signal to a process group. |
687880f9 | 557 | */ |
8429d022 | 558 | void |
802236f4 KB |
559 | gsignal(pgid, signum) |
560 | int pgid, signum; | |
8fe87cbb | 561 | { |
f4af9a5b | 562 | struct pgrp *pgrp; |
8fe87cbb | 563 | |
f4af9a5b | 564 | if (pgid && (pgrp = pgfind(pgid))) |
802236f4 | 565 | pgsignal(pgrp, signum, 0); |
8fe87cbb | 566 | } |
e635a749 | 567 | |
22585170 | 568 | /* |
802236f4 KB |
569 | * Send a signal to a process group. If checktty is 1, |
570 | * limit to members which have a controlling terminal. | |
22585170 | 571 | */ |
8429d022 | 572 | void |
802236f4 | 573 | pgsignal(pgrp, signum, checkctty) |
f4af9a5b | 574 | struct pgrp *pgrp; |
802236f4 | 575 | int signum, 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) |
802236f4 | 582 | psignal(p, signum); |
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 | 590 | void |
802236f4 | 591 | trapsignal(p, signum, code) |
8429d022 | 592 | struct proc *p; |
802236f4 KB |
593 | register int signum; |
594 | u_int code; | |
f4af9a5b | 595 | { |
8429d022 | 596 | register struct sigacts *ps = p->p_sigacts; |
f4af9a5b MK |
597 | int mask; |
598 | ||
802236f4 | 599 | mask = sigmask(signum); |
f4af9a5b MK |
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)) | |
802236f4 | 605 | ktrpsig(p->p_tracep, signum, ps->ps_sigact[signum], |
22585170 MT |
606 | p->p_sigmask, code); |
607 | #endif | |
802236f4 KB |
608 | sendsig(ps->ps_sigact[signum], signum, p->p_sigmask, code); |
609 | p->p_sigmask |= ps->ps_catchmask[signum] | mask; | |
f4af9a5b | 610 | } else { |
8429d022 | 611 | ps->ps_code = code; /* XXX for core dump/debugger */ |
802236f4 | 612 | psignal(p, signum); |
f4af9a5b | 613 | } |
687880f9 BJ |
614 | } |
615 | ||
616 | /* | |
802236f4 KB |
617 | * Send the signal to the process. If the signal has an action, the action |
618 | * is usually performed by the target process rather than the caller; we add | |
8429d022 | 619 | * the signal to the set of pending signals for the process. |
802236f4 | 620 | * |
22585170 | 621 | * Exceptions: |
802236f4 KB |
622 | * o When a stop signal is sent to a sleeping process that takes the |
623 | * default action, the process is stopped without awakening it. | |
22585170 MT |
624 | * o SIGCONT restarts stopped processes (or puts them back to sleep) |
625 | * regardless of the signal action (eg, blocked or ignored). | |
802236f4 | 626 | * |
22585170 | 627 | * Other ignored signals are discarded immediately. |
687880f9 | 628 | */ |
8429d022 | 629 | void |
802236f4 | 630 | psignal(p, signum) |
687880f9 | 631 | register struct proc *p; |
802236f4 | 632 | register int signum; |
687880f9 | 633 | { |
8429d022 | 634 | register int s, prop; |
f4af9a5b | 635 | register sig_t action; |
feff6b5a | 636 | int mask; |
687880f9 | 637 | |
802236f4 KB |
638 | if ((u_int)signum >= NSIG || signum == 0) |
639 | panic("psignal signal number"); | |
640 | mask = sigmask(signum); | |
641 | prop = sigprop[signum]; | |
687880f9 BJ |
642 | |
643 | /* | |
644 | * If proc is traced, always give parent a chance. | |
687880f9 BJ |
645 | */ |
646 | if (p->p_flag & STRC) | |
647 | action = SIG_DFL; | |
648 | else { | |
687880f9 | 649 | /* |
dd012d1e SL |
650 | * If the signal is being ignored, |
651 | * then we forget about it immediately. | |
f4af9a5b MK |
652 | * (Note: we don't set SIGCONT in p_sigignore, |
653 | * and if it is set to SIG_IGN, | |
654 | * action will be SIG_DFL here.) | |
687880f9 | 655 | */ |
feff6b5a | 656 | if (p->p_sigignore & mask) |
687880f9 | 657 | return; |
feff6b5a | 658 | if (p->p_sigmask & mask) |
dd012d1e | 659 | action = SIG_HOLD; |
feff6b5a | 660 | else if (p->p_sigcatch & mask) |
dd012d1e | 661 | action = SIG_CATCH; |
e51c8e4a | 662 | else |
dd012d1e | 663 | action = SIG_DFL; |
687880f9 | 664 | } |
687880f9 | 665 | |
90f62fff KM |
666 | if (p->p_nice > NZERO && action == SIG_DFL && (prop & SA_KILL) && |
667 | (p->p_flag & STRC) == 0) | |
8429d022 | 668 | p->p_nice = NZERO; |
687880f9 | 669 | |
8429d022 | 670 | if (prop & SA_CONT) |
f4af9a5b | 671 | p->p_sig &= ~stopsigmask; |
f4af9a5b | 672 | |
8429d022 | 673 | if (prop & SA_STOP) { |
faf9c963 MK |
674 | /* |
675 | * If sending a tty stop signal to a member of an orphaned | |
676 | * process group, discard the signal here if the action | |
677 | * is default; don't stop the process below if sleeping, | |
678 | * and don't clear any pending SIGCONT. | |
679 | */ | |
8429d022 MK |
680 | if (prop & SA_TTYSTOP && p->p_pgrp->pg_jobc == 0 && |
681 | action == SIG_DFL) | |
9db58063 | 682 | return; |
8429d022 | 683 | p->p_sig &= ~contsigmask; |
687880f9 | 684 | } |
f4af9a5b MK |
685 | p->p_sig |= mask; |
686 | ||
687880f9 | 687 | /* |
f4af9a5b MK |
688 | * Defer further processing for signals which are held, |
689 | * except that stopped processes must be continued by SIGCONT. | |
687880f9 | 690 | */ |
8429d022 | 691 | if (action == SIG_HOLD && ((prop & SA_CONT) == 0 || p->p_stat != SSTOP)) |
687880f9 | 692 | return; |
feff6b5a | 693 | s = splhigh(); |
687880f9 BJ |
694 | switch (p->p_stat) { |
695 | ||
696 | case SSLEEP: | |
697 | /* | |
22585170 | 698 | * If process is sleeping uninterruptibly |
687880f9 BJ |
699 | * we can't interrupt the sleep... the signal will |
700 | * be noticed when the process returns through | |
701 | * trap() or syscall(). | |
702 | */ | |
22585170 | 703 | if ((p->p_flag & SSINTR) == 0) |
687880f9 BJ |
704 | goto out; |
705 | /* | |
706 | * Process is sleeping and traced... make it runnable | |
707 | * so it can discover the signal in issig() and stop | |
708 | * for the parent. | |
709 | */ | |
90f62fff | 710 | if (p->p_flag & STRC) |
687880f9 | 711 | goto run; |
90f62fff KM |
712 | /* |
713 | * If SIGCONT is default (or ignored) and process is | |
714 | * asleep, we are finished; the process should not | |
715 | * be awakened. | |
716 | */ | |
717 | if ((prop & SA_CONT) && action == SIG_DFL) { | |
718 | p->p_sig &= ~mask; | |
719 | goto out; | |
720 | } | |
f4af9a5b MK |
721 | /* |
722 | * When a sleeping process receives a stop | |
723 | * signal, process immediately if possible. | |
724 | * All other (caught or default) signals | |
725 | * cause the process to run. | |
726 | */ | |
8429d022 | 727 | if (prop & SA_STOP) { |
687880f9 | 728 | if (action != SIG_DFL) |
f4af9a5b | 729 | goto runfast; |
687880f9 | 730 | /* |
8429d022 MK |
731 | * If a child holding parent blocked, |
732 | * stopping could cause deadlock. | |
687880f9 | 733 | */ |
90f62fff | 734 | if (p->p_flag & SPPWAIT) |
687880f9 | 735 | goto out; |
feff6b5a | 736 | p->p_sig &= ~mask; |
802236f4 | 737 | p->p_xstat = signum; |
f4af9a5b MK |
738 | if ((p->p_pptr->p_flag & SNOCLDSTOP) == 0) |
739 | psignal(p->p_pptr, SIGCHLD); | |
687880f9 BJ |
740 | stop(p); |
741 | goto out; | |
f4af9a5b MK |
742 | } else |
743 | goto runfast; | |
687880f9 BJ |
744 | /*NOTREACHED*/ |
745 | ||
746 | case SSTOP: | |
747 | /* | |
748 | * If traced process is already stopped, | |
749 | * then no further action is necessary. | |
750 | */ | |
90f62fff | 751 | if (p->p_flag & STRC) |
687880f9 | 752 | goto out; |
687880f9 | 753 | |
8429d022 MK |
754 | /* |
755 | * Kill signal always sets processes running. | |
756 | */ | |
802236f4 | 757 | if (signum == SIGKILL) |
f4af9a5b | 758 | goto runfast; |
687880f9 | 759 | |
8429d022 | 760 | if (prop & SA_CONT) { |
687880f9 | 761 | /* |
f4af9a5b MK |
762 | * If SIGCONT is default (or ignored), we continue |
763 | * the process but don't leave the signal in p_sig, | |
764 | * as it has no further action. If SIGCONT is held, | |
765 | * continue the process and leave the signal in p_sig. | |
687880f9 BJ |
766 | * If the process catches SIGCONT, let it handle |
767 | * the signal itself. If it isn't waiting on | |
768 | * an event, then it goes back to run state. | |
769 | * Otherwise, process goes back to sleep state. | |
770 | */ | |
f4af9a5b MK |
771 | if (action == SIG_DFL) |
772 | p->p_sig &= ~mask; | |
773 | if (action == SIG_CATCH) | |
774 | goto runfast; | |
775 | if (p->p_wchan == 0) | |
687880f9 BJ |
776 | goto run; |
777 | p->p_stat = SSLEEP; | |
778 | goto out; | |
8429d022 | 779 | } |
687880f9 | 780 | |
8429d022 | 781 | if (prop & SA_STOP) { |
687880f9 BJ |
782 | /* |
783 | * Already stopped, don't need to stop again. | |
784 | * (If we did the shell could get confused.) | |
785 | */ | |
feff6b5a | 786 | p->p_sig &= ~mask; /* take it away */ |
687880f9 | 787 | goto out; |
687880f9 | 788 | } |
8429d022 MK |
789 | |
790 | /* | |
791 | * If process is sleeping interruptibly, then | |
792 | * simulate a wakeup so that when it is continued, | |
793 | * it will be made runnable and can look at the signal. | |
794 | * But don't setrun the process, leave it stopped. | |
795 | */ | |
796 | if (p->p_wchan && p->p_flag & SSINTR) | |
797 | unsleep(p); | |
798 | goto out; | |
687880f9 BJ |
799 | |
800 | default: | |
801 | /* | |
802 | * SRUN, SIDL, SZOMB do nothing with the signal, | |
803 | * other than kicking ourselves if we are running. | |
804 | * It will either never be noticed, or noticed very soon. | |
805 | */ | |
35493b0f | 806 | if (p == curproc) |
8e6cd807 | 807 | signotify(p); |
687880f9 BJ |
808 | goto out; |
809 | } | |
810 | /*NOTREACHED*/ | |
f4af9a5b MK |
811 | |
812 | runfast: | |
687880f9 BJ |
813 | /* |
814 | * Raise priority to at least PUSER. | |
815 | */ | |
816 | if (p->p_pri > PUSER) | |
e4f89871 | 817 | p->p_pri = PUSER; |
f4af9a5b | 818 | run: |
687880f9 BJ |
819 | setrun(p); |
820 | out: | |
821 | splx(s); | |
822 | } | |
823 | ||
824 | /* | |
802236f4 KB |
825 | * If the current process has received a signal (should be caught or cause |
826 | * termination, should interrupt current syscall), return the signal number. | |
827 | * Stop signals with default action are processed immediately, then cleared; | |
828 | * they aren't returned. This is checked after each entry to the system for | |
829 | * a syscall or trap (though this can usually be done without calling issig | |
830 | * by checking the pending signal masks in the CURSIG macro.) The normal call | |
831 | * sequence is | |
8429d022 | 832 | * |
802236f4 KB |
833 | * while (signum = CURSIG(curproc)) |
834 | * psig(signum); | |
687880f9 | 835 | */ |
8429d022 MK |
836 | issig(p) |
837 | register struct proc *p; | |
687880f9 | 838 | { |
802236f4 | 839 | register int signum, 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); | |
802236f4 KB |
847 | signum = ffs((long)mask); |
848 | mask = sigmask(signum); | |
849 | prop = sigprop[signum]; | |
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 | */ | |
802236f4 | 863 | p->p_xstat = signum; |
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 */ |
802236f4 KB |
885 | signum = p->p_xstat; |
886 | if (signum == 0) | |
687880f9 | 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 | */ |
802236f4 | 894 | mask = sigmask(signum); |
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 | */ | |
802236f4 | 905 | switch ((int)p->p_sigacts->ps_sigact[signum]) { |
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", | |
802236f4 | 918 | p->p_pid, signum); |
fc080d8d | 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 */ |
802236f4 | 934 | p->p_xstat = signum; |
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 |
802236f4 | 947 | return (signum); |
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 | */ | |
802236f4 | 965 | return (signum); |
687880f9 | 966 | } |
22585170 | 967 | p->p_sig &= ~mask; /* take the signal! */ |
687880f9 | 968 | } |
22585170 | 969 | /* NOTREACHED */ |
687880f9 BJ |
970 | } |
971 | ||
687880f9 | 972 | /* |
802236f4 KB |
973 | * Put the argument process into the stopped state and notify the parent |
974 | * via wakeup. Signals are handled elsewhere. The process must not be | |
975 | * on the run queue. | |
687880f9 BJ |
976 | */ |
977 | stop(p) | |
978 | register struct proc *p; | |
979 | { | |
980 | ||
981 | p->p_stat = SSTOP; | |
982 | p->p_flag &= ~SWTED; | |
983 | wakeup((caddr_t)p->p_pptr); | |
687880f9 BJ |
984 | } |
985 | ||
986 | /* | |
8429d022 MK |
987 | * Take the action for the specified signal |
988 | * from the current set of pending signals. | |
687880f9 | 989 | */ |
8429d022 | 990 | void |
802236f4 KB |
991 | psig(signum) |
992 | register int signum; | |
687880f9 | 993 | { |
8429d022 MK |
994 | register struct proc *p = curproc; |
995 | register struct sigacts *ps = p->p_sigacts; | |
f4af9a5b | 996 | register sig_t action; |
8429d022 | 997 | int mask, returnmask; |
f4af9a5b | 998 | |
22585170 | 999 | #ifdef DIAGNOSTIC |
802236f4 | 1000 | if (signum == 0) |
8429d022 | 1001 | panic("psig"); |
22585170 | 1002 | #endif |
802236f4 | 1003 | mask = sigmask(signum); |
8429d022 | 1004 | p->p_sig &= ~mask; |
802236f4 | 1005 | action = ps->ps_sigact[signum]; |
22585170 | 1006 | #ifdef KTRACE |
8429d022 | 1007 | if (KTRPOINT(p, KTR_PSIG)) |
802236f4 KB |
1008 | ktrpsig(p->p_tracep, |
1009 | signum, 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 | */ |
802236f4 | 1017 | sigexit(p, signum); |
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; | |
802236f4 | 1042 | p->p_sigmask |= ps->ps_catchmask[signum] | mask; |
8429d022 MK |
1043 | (void) spl0(); |
1044 | p->p_stats->p_ru.ru_nsignals++; | |
802236f4 | 1045 | sendsig(action, signum, 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 | 1062 | /* |
802236f4 KB |
1063 | * Force the current process to exit with the specified signal, dumping core |
1064 | * if appropriate. We bypass the normal tests for masked and caught signals, | |
1065 | * allowing unrecoverable failures to terminate the process without changing | |
1066 | * signal state. Mark the accounting record with the signal termination. | |
1067 | * If dumping core, save the signal number for the debugger. Calls exit and | |
1068 | * does not return. | |
35493b0f | 1069 | */ |
802236f4 | 1070 | sigexit(p, signum) |
35493b0f | 1071 | register struct proc *p; |
802236f4 | 1072 | int signum; |
35493b0f MK |
1073 | { |
1074 | ||
1075 | p->p_acflag |= AXSIG; | |
802236f4 KB |
1076 | if (sigprop[signum] & SA_CORE) { |
1077 | p->p_sigacts->ps_sig = signum; | |
35493b0f | 1078 | if (coredump(p) == 0) |
802236f4 | 1079 | signum |= WCOREFLAG; |
35493b0f | 1080 | } |
802236f4 | 1081 | exit1(p, W_EXITCODE(0, signum)); |
35493b0f MK |
1082 | /* NOTREACHED */ |
1083 | } | |
1084 | ||
687880f9 | 1085 | /* |
802236f4 KB |
1086 | * Dump core, into a file named "core.progname". |
1087 | * Do not drop core if the process was setuid/setgid. | |
687880f9 | 1088 | */ |
8429d022 MK |
1089 | coredump(p) |
1090 | register struct proc *p; | |
687880f9 | 1091 | { |
c4ec2128 | 1092 | register struct vnode *vp; |
8429d022 MK |
1093 | register struct pcred *pcred = p->p_cred; |
1094 | register struct ucred *cred = pcred->pc_ucred; | |
1095 | register struct vmspace *vm = p->p_vmspace; | |
d86a61ec | 1096 | struct vattr vattr; |
79583d0d | 1097 | int error, error1; |
8429d022 | 1098 | struct nameidata nd; |
802236f4 | 1099 | char name[MAXCOMLEN+6]; /* progname.core */ |
687880f9 | 1100 | |
802236f4 | 1101 | if (pcred->p_svuid != pcred->p_ruid || pcred->p_svgid != pcred->p_rgid) |
d86a61ec | 1102 | return (EFAULT); |
8429d022 MK |
1103 | if (ctob(UPAGES + vm->vm_dsize + vm->vm_ssize) >= |
1104 | p->p_rlimit[RLIMIT_CORE].rlim_cur) | |
d86a61ec | 1105 | return (EFAULT); |
802236f4 | 1106 | sprintf(name, "%s.core", p->p_comm); |
0c9db509 | 1107 | NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, name, p); |
802236f4 KB |
1108 | if (error = vn_open(&nd, |
1109 | O_CREAT | FWRITE, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH)) | |
d86a61ec | 1110 | return (error); |
8429d022 | 1111 | vp = nd.ni_vp; |
802236f4 KB |
1112 | |
1113 | /* Don't dump to non-regular files or files with links. */ | |
1114 | if (vp->v_type != VREG || | |
1115 | VOP_GETATTR(vp, &vattr, cred, p) || 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 | } |