Commit | Line | Data |
---|---|---|
da7c5cc6 | 1 | /* |
2e40cc0a KB |
2 | * Copyright (c) 1982, 1986, 1989, 1991, 1993 |
3 | * The Regents of the University of California. All rights reserved. | |
adb35f79 KB |
4 | * (c) UNIX System Laboratories, Inc. |
5 | * All or some portions of this file are derived from material licensed | |
6 | * to the University of California by American Telephone and Telegraph | |
7 | * Co. or Unix System Laboratories, Inc. and are reproduced herein with | |
8 | * the permission of UNIX System Laboratories, Inc. | |
da7c5cc6 | 9 | * |
dbf0c423 | 10 | * %sccs.include.redist.c% |
c4ec2128 | 11 | * |
adb35f79 | 12 | * @(#)kern_exit.c 8.6 (Berkeley) %G% |
da7c5cc6 | 13 | */ |
a8560fa0 | 14 | |
38a01dbe KB |
15 | #include <sys/param.h> |
16 | #include <sys/systm.h> | |
17 | #include <sys/map.h> | |
18 | #include <sys/ioctl.h> | |
19 | #include <sys/proc.h> | |
20 | #include <sys/tty.h> | |
21 | #include <sys/time.h> | |
22 | #include <sys/resource.h> | |
23 | #include <sys/kernel.h> | |
24 | #include <sys/buf.h> | |
25 | #include <sys/wait.h> | |
26 | #include <sys/file.h> | |
27 | #include <sys/vnode.h> | |
28 | #include <sys/syslog.h> | |
29 | #include <sys/malloc.h> | |
30 | #include <sys/resourcevar.h> | |
31 | #include <sys/ptrace.h> | |
a8560fa0 | 32 | |
38a01dbe | 33 | #include <machine/cpu.h> |
1ad494e6 | 34 | #ifdef COMPAT_43 |
38a01dbe KB |
35 | #include <machine/reg.h> |
36 | #include <machine/psl.h> | |
1ad494e6 MK |
37 | #endif |
38 | ||
38a01dbe KB |
39 | #include <vm/vm.h> |
40 | #include <vm/vm_kern.h> | |
9db58063 | 41 | |
8c065ade KB |
42 | __dead void cpu_exit __P((struct proc *)); |
43 | __dead void exit1 __P((struct proc *, int)); | |
44 | ||
a8560fa0 | 45 | /* |
1732aa9d KB |
46 | * exit -- |
47 | * Death of process. | |
a8560fa0 | 48 | */ |
9e97623a CT |
49 | struct rexit_args { |
50 | int rval; | |
51 | }; | |
8c065ade | 52 | __dead void |
1732aa9d | 53 | exit(p, uap, retval) |
1bfd8b20 | 54 | struct proc *p; |
9e97623a | 55 | struct rexit_args *uap; |
1bfd8b20 KM |
56 | int *retval; |
57 | { | |
a8560fa0 | 58 | |
817f339a | 59 | exit1(p, W_EXITCODE(uap->rval, 0)); |
5360383b | 60 | /* NOTREACHED */ |
a8560fa0 SL |
61 | } |
62 | ||
63 | /* | |
1732aa9d KB |
64 | * Exit: deallocate address space and other resources, change proc state |
65 | * to zombie, and unlink proc from allproc and parent's lists. Save exit | |
66 | * status and rusage for wait(). Check for child processes and orphan them. | |
a8560fa0 | 67 | */ |
8c065ade | 68 | __dead void |
817f339a | 69 | exit1(p, rv) |
8429d022 | 70 | register struct proc *p; |
c35e8b3f | 71 | int rv; |
a8560fa0 | 72 | { |
1bfd8b20 | 73 | register struct proc *q, *nq; |
4a438310 | 74 | register struct proc **pp; |
7322266f | 75 | register struct vmspace *vm; |
a8560fa0 | 76 | |
efe68e1f KM |
77 | if (p->p_pid == 1) |
78 | panic("init died (signal %d, exit %d)", | |
79 | WTERMSIG(rv), WEXITSTATUS(rv)); | |
a8560fa0 SL |
80 | #ifdef PGINPROF |
81 | vmsizmon(); | |
82 | #endif | |
cf5ef508 | 83 | if (p->p_flag & P_PROFIL) |
e0ef57b1 | 84 | stopprofclock(p); |
61d22ffc KM |
85 | MALLOC(p->p_ru, struct rusage *, sizeof(struct rusage), |
86 | M_ZOMBIE, M_WAITOK); | |
8429d022 MK |
87 | /* |
88 | * If parent is waiting for us to exit or exec, | |
cf5ef508 | 89 | * P_PPWAIT is set; we will wakeup the parent below. |
8429d022 | 90 | */ |
cf5ef508 KB |
91 | p->p_flag &= ~(P_TRACED | P_PPWAIT); |
92 | p->p_flag |= P_WEXIT; | |
dd012d1e | 93 | p->p_sigignore = ~0; |
cf5ef508 | 94 | p->p_siglist = 0; |
a8560fa0 | 95 | untimeout(realitexpire, (caddr_t)p); |
8429d022 MK |
96 | |
97 | /* | |
98 | * Close open files and release open-file table. | |
99 | * This may block! | |
100 | */ | |
101 | fdfree(p); | |
fe3cec6e MK |
102 | |
103 | /* The next two chunks should probably be moved to vmspace_exit. */ | |
7322266f | 104 | vm = p->p_vmspace; |
9db58063 | 105 | #ifdef SYSVSHM |
7322266f | 106 | if (vm->vm_shm) |
9db58063 KM |
107 | shmexit(p); |
108 | #endif | |
fe3cec6e MK |
109 | /* |
110 | * Release user portion of address space. | |
111 | * This releases references to vnodes, | |
112 | * which could cause I/O if the file has been unlinked. | |
113 | * Need to do this early enough that we can still sleep. | |
114 | * Can't free the entire vmspace as the kernel stack | |
115 | * may be mapped within that space also. | |
116 | */ | |
7322266f KM |
117 | if (vm->vm_refcnt == 1) |
118 | (void) vm_map_remove(&vm->vm_map, VM_MIN_ADDRESS, | |
fe3cec6e | 119 | VM_MAXUSER_ADDRESS); |
8429d022 | 120 | |
1ad494e6 | 121 | if (SESS_LEADER(p)) { |
a38b908e MT |
122 | register struct session *sp = p->p_session; |
123 | ||
124 | if (sp->s_ttyvp) { | |
125 | /* | |
126 | * Controlling process. | |
e149007b MK |
127 | * Signal foreground pgrp, |
128 | * drain controlling terminal | |
129 | * and revoke access to controlling terminal. | |
a38b908e | 130 | */ |
e149007b MK |
131 | if (sp->s_ttyp->t_session == sp) { |
132 | if (sp->s_ttyp->t_pgrp) | |
133 | pgsignal(sp->s_ttyp->t_pgrp, SIGHUP, 1); | |
134 | (void) ttywait(sp->s_ttyp); | |
135 | vgoneall(sp->s_ttyvp); | |
136 | } | |
a38b908e MT |
137 | vrele(sp->s_ttyvp); |
138 | sp->s_ttyvp = NULL; | |
61fa8c82 MT |
139 | /* |
140 | * s_ttyp is not zero'd; we use this to indicate | |
141 | * that the session once had a controlling terminal. | |
a38b908e | 142 | * (for logging and informational purposes) |
61fa8c82 | 143 | */ |
1ad494e6 | 144 | } |
e149007b | 145 | sp->s_leader = NULL; |
1ad494e6 | 146 | } |
8429d022 MK |
147 | fixjobc(p, p->p_pgrp, 0); |
148 | p->p_rlimit[RLIMIT_FSIZE].rlim_cur = RLIM_INFINITY; | |
52ec1332 | 149 | (void)acct_process(p); |
1ad494e6 MK |
150 | #ifdef KTRACE |
151 | /* | |
152 | * release trace file | |
153 | */ | |
d06df067 | 154 | p->p_traceflag = 0; /* don't trace the vrele() */ |
1ad494e6 | 155 | if (p->p_tracep) |
c4ec2128 | 156 | vrele(p->p_tracep); |
a8560fa0 | 157 | #endif |
8429d022 MK |
158 | /* |
159 | * Remove proc from allproc queue and pidhash chain. | |
160 | * Place onto zombproc. Unlink from parent's child list. | |
161 | */ | |
cf5ef508 KB |
162 | if (*p->p_prev = p->p_next) |
163 | p->p_next->p_prev = p->p_prev; | |
164 | if (p->p_next = zombproc) | |
165 | p->p_next->p_prev = &p->p_next; | |
1d348849 MK |
166 | p->p_prev = &zombproc; |
167 | zombproc = p; | |
a8560fa0 | 168 | p->p_stat = SZOMB; |
de8789fe | 169 | |
4a438310 MK |
170 | for (pp = &pidhash[PIDHASH(p->p_pid)]; *pp; pp = &(*pp)->p_hash) |
171 | if (*pp == p) { | |
172 | *pp = p->p_hash; | |
173 | goto done; | |
174 | } | |
175 | panic("exit"); | |
176 | done: | |
8429d022 | 177 | |
1d348849 | 178 | if (p->p_cptr) /* only need this if any child is S_ZOMB */ |
8429d022 | 179 | wakeup((caddr_t) initproc); |
1d348849 MK |
180 | for (q = p->p_cptr; q != NULL; q = nq) { |
181 | nq = q->p_osptr; | |
182 | if (nq != NULL) | |
183 | nq->p_ysptr = NULL; | |
8429d022 MK |
184 | if (initproc->p_cptr) |
185 | initproc->p_cptr->p_ysptr = q; | |
186 | q->p_osptr = initproc->p_cptr; | |
1d348849 | 187 | q->p_ysptr = NULL; |
8429d022 | 188 | initproc->p_cptr = q; |
a8560fa0 | 189 | |
8429d022 | 190 | q->p_pptr = initproc; |
1d348849 MK |
191 | /* |
192 | * Traced processes are killed | |
193 | * since their existence means someone is screwing up. | |
1d348849 | 194 | */ |
cf5ef508 KB |
195 | if (q->p_flag & P_TRACED) { |
196 | q->p_flag &= ~P_TRACED; | |
1d348849 | 197 | psignal(q, SIGKILL); |
a8560fa0 | 198 | } |
1d348849 | 199 | } |
bdf8c113 | 200 | p->p_cptr = NULL; |
8429d022 MK |
201 | |
202 | /* | |
509987d3 | 203 | * Save exit status and final rusage info, adding in child rusage |
f3e27f1d | 204 | * info and self times. |
8429d022 MK |
205 | */ |
206 | p->p_xstat = rv; | |
207 | *p->p_ru = p->p_stats->p_ru; | |
509987d3 | 208 | calcru(p, &p->p_ru->ru_utime, &p->p_ru->ru_stime, NULL); |
8429d022 MK |
209 | ruadd(p->p_ru, &p->p_stats->p_cru); |
210 | ||
211 | /* | |
212 | * Notify parent that we're gone. | |
213 | */ | |
a8560fa0 SL |
214 | psignal(p->p_pptr, SIGCHLD); |
215 | wakeup((caddr_t)p->p_pptr); | |
fb1db32c | 216 | #if defined(tahoe) |
e149007b MK |
217 | /* move this to cpu_exit */ |
218 | p->p_addr->u_pcb.pcb_savacc.faddr = (float *)NULL; | |
fb1db32c | 219 | #endif |
de8789fe KM |
220 | /* |
221 | * Clear curproc after we've done all operations | |
222 | * that could block, and before tearing down the rest | |
223 | * of the process state that might be used from clock, etc. | |
224 | * Also, can't clear curproc while we're still runnable, | |
225 | * as we're not on a run queue (we are current, just not | |
226 | * a proper proc any longer!). | |
227 | * | |
228 | * Other substructures are freed from wait(). | |
229 | */ | |
230 | curproc = NULL; | |
231 | if (--p->p_limit->p_refcnt == 0) | |
232 | FREE(p->p_limit, M_SUBPROC); | |
233 | ||
8429d022 | 234 | /* |
e149007b MK |
235 | * Finally, call machine-dependent code to release the remaining |
236 | * resources including address space, the kernel stack and pcb. | |
237 | * The address space is released by "vmspace_free(p->p_vmspace)"; | |
238 | * This is machine-dependent, as we may have to change stacks | |
239 | * or ensure that the current one isn't reallocated before we | |
509987d3 | 240 | * finish. cpu_exit will end with a call to cpu_swtch(), finishing |
e149007b | 241 | * our execution (pun intended). |
8429d022 | 242 | */ |
e149007b | 243 | cpu_exit(p); |
a8560fa0 SL |
244 | } |
245 | ||
9e97623a CT |
246 | struct wait_args { |
247 | int pid; | |
248 | int *status; | |
249 | int options; | |
250 | struct rusage *rusage; | |
251 | #ifdef COMPAT_43 | |
252 | int compat; /* pseudo */ | |
253 | #endif | |
254 | }; | |
255 | ||
1ad494e6 | 256 | #ifdef COMPAT_43 |
2a81c17c | 257 | #if defined(hp300) || defined(luna68k) |
ef07a225 MH |
258 | #include <machine/frame.h> |
259 | #define GETPS(rp) ((struct frame *)(rp))->f_sr | |
260 | #else | |
261 | #define GETPS(rp) (rp)[PS] | |
262 | #endif | |
263 | ||
1bfd8b20 KM |
264 | owait(p, uap, retval) |
265 | struct proc *p; | |
9e97623a | 266 | register struct wait_args *uap; |
1bfd8b20 KM |
267 | int *retval; |
268 | { | |
a8560fa0 | 269 | |
ba0aea50 | 270 | #ifdef PSL_ALLCC |
ef07a225 | 271 | if ((GETPS(p->p_md.md_regs) & PSL_ALLCC) != PSL_ALLCC) { |
c35e8b3f | 272 | uap->options = 0; |
9e97623a | 273 | uap->rusage = NULL; |
1ad494e6 | 274 | } else { |
5d398c16 KM |
275 | uap->options = p->p_md.md_regs[R0]; |
276 | uap->rusage = (struct rusage *)p->p_md.md_regs[R1]; | |
a8560fa0 | 277 | } |
ba0aea50 RC |
278 | #else |
279 | uap->options = 0; | |
9e97623a | 280 | uap->rusage = NULL; |
ba0aea50 | 281 | #endif |
1ad494e6 | 282 | uap->pid = WAIT_ANY; |
9e97623a | 283 | uap->status = NULL; |
a2528931 | 284 | uap->compat = 1; |
d9c2f47f | 285 | return (wait1(p, uap, retval)); |
1ad494e6 MK |
286 | } |
287 | ||
1bfd8b20 KM |
288 | wait4(p, uap, retval) |
289 | struct proc *p; | |
9e97623a | 290 | struct wait_args *uap; |
1bfd8b20 KM |
291 | int *retval; |
292 | { | |
a2528931 MK |
293 | |
294 | uap->compat = 0; | |
d9c2f47f | 295 | return (wait1(p, uap, retval)); |
a8560fa0 | 296 | } |
a2528931 MK |
297 | #else |
298 | #define wait1 wait4 | |
1ad494e6 | 299 | #endif |
a8560fa0 | 300 | |
cb84e0ab | 301 | int |
1bfd8b20 KM |
302 | wait1(q, uap, retval) |
303 | register struct proc *q; | |
9e97623a | 304 | register struct wait_args *uap; |
1bfd8b20 KM |
305 | int retval[]; |
306 | { | |
8429d022 | 307 | register int nfound; |
efe68e1f | 308 | register struct proc *p, *t; |
a2528931 | 309 | int status, error; |
a8560fa0 | 310 | |
1ad494e6 MK |
311 | if (uap->pid == 0) |
312 | uap->pid = -q->p_pgid; | |
c35e8b3f | 313 | #ifdef notyet |
a2528931 | 314 | if (uap->options &~ (WUNTRACED|WNOHANG)) |
d9c2f47f | 315 | return (EINVAL); |
c35e8b3f | 316 | #endif |
1ad494e6 | 317 | loop: |
8429d022 | 318 | nfound = 0; |
1d348849 | 319 | for (p = q->p_cptr; p; p = p->p_osptr) { |
1ad494e6 MK |
320 | if (uap->pid != WAIT_ANY && |
321 | p->p_pid != uap->pid && p->p_pgid != -uap->pid) | |
322 | continue; | |
8429d022 | 323 | nfound++; |
a8560fa0 | 324 | if (p->p_stat == SZOMB) { |
1bfd8b20 | 325 | retval[0] = p->p_pid; |
1ad494e6 | 326 | #ifdef COMPAT_43 |
a2528931 | 327 | if (uap->compat) |
1bfd8b20 | 328 | retval[1] = p->p_xstat; |
1ad494e6 MK |
329 | else |
330 | #endif | |
331 | if (uap->status) { | |
a2528931 MK |
332 | status = p->p_xstat; /* convert to int */ |
333 | if (error = copyout((caddr_t)&status, | |
1ad494e6 | 334 | (caddr_t)uap->status, sizeof(status))) |
d9c2f47f | 335 | return (error); |
5e63dd78 | 336 | } |
a2528931 MK |
337 | if (uap->rusage && (error = copyout((caddr_t)p->p_ru, |
338 | (caddr_t)uap->rusage, sizeof (struct rusage)))) | |
d9c2f47f | 339 | return (error); |
efe68e1f KM |
340 | /* |
341 | * If we got the child via a ptrace 'attach', | |
342 | * we need to give it back to the old parent. | |
343 | */ | |
344 | if (p->p_oppid && (t = pfind(p->p_oppid))) { | |
345 | p->p_oppid = 0; | |
346 | proc_reparent(p, t); | |
347 | psignal(t, SIGCHLD); | |
348 | wakeup((caddr_t)t); | |
349 | return (0); | |
350 | } | |
1ad494e6 | 351 | p->p_xstat = 0; |
8429d022 | 352 | ruadd(&q->p_stats->p_cru, p->p_ru); |
1ad494e6 | 353 | FREE(p->p_ru, M_ZOMBIE); |
db8fc89d KM |
354 | |
355 | /* | |
356 | * Decrement the count of procs running with this uid. | |
357 | */ | |
358 | (void)chgproccnt(p->p_cred->p_ruid, -1); | |
359 | ||
360 | /* | |
361 | * Free up credentials. | |
362 | */ | |
fe3cec6e MK |
363 | if (--p->p_cred->p_refcnt == 0) { |
364 | crfree(p->p_cred->pc_ucred); | |
365 | FREE(p->p_cred, M_SUBPROC); | |
366 | } | |
8429d022 | 367 | |
859437ef JSP |
368 | /* |
369 | * Release reference to text vnode | |
370 | */ | |
371 | if (p->p_textvp) | |
372 | vrele(p->p_textvp); | |
373 | ||
8429d022 MK |
374 | /* |
375 | * Finally finished with old proc entry. | |
376 | * Unlink it from its process group and free it. | |
377 | */ | |
378 | leavepgrp(p); | |
cf5ef508 KB |
379 | if (*p->p_prev = p->p_next) /* off zombproc */ |
380 | p->p_next->p_prev = p->p_prev; | |
a8560fa0 SL |
381 | if (q = p->p_ysptr) |
382 | q->p_osptr = p->p_osptr; | |
383 | if (q = p->p_osptr) | |
384 | q->p_ysptr = p->p_ysptr; | |
385 | if ((q = p->p_pptr)->p_cptr == p) | |
386 | q->p_cptr = p->p_osptr; | |
4021f565 | 387 | |
fe3cec6e MK |
388 | /* |
389 | * Give machine-dependent layer a chance | |
390 | * to free anything that cpu_exit couldn't | |
391 | * release while still running in process context. | |
392 | */ | |
393 | cpu_wait(p); | |
8429d022 MK |
394 | FREE(p, M_PROC); |
395 | nprocs--; | |
d9c2f47f | 396 | return (0); |
a8560fa0 | 397 | } |
cf5ef508 KB |
398 | if (p->p_stat == SSTOP && (p->p_flag & P_WAITED) == 0 && |
399 | (p->p_flag & P_TRACED || uap->options & WUNTRACED)) { | |
400 | p->p_flag |= P_WAITED; | |
1bfd8b20 | 401 | retval[0] = p->p_pid; |
1ad494e6 | 402 | #ifdef COMPAT_43 |
85d629e3 | 403 | if (uap->compat) { |
19dec745 | 404 | retval[1] = W_STOPCODE(p->p_xstat); |
85d629e3 KM |
405 | error = 0; |
406 | } else | |
1ad494e6 MK |
407 | #endif |
408 | if (uap->status) { | |
19dec745 | 409 | status = W_STOPCODE(p->p_xstat); |
a2528931 | 410 | error = copyout((caddr_t)&status, |
ba0aea50 | 411 | (caddr_t)uap->status, sizeof(status)); |
a2528931 MK |
412 | } else |
413 | error = 0; | |
d9c2f47f | 414 | return (error); |
a8560fa0 SL |
415 | } |
416 | } | |
8429d022 | 417 | if (nfound == 0) |
d9c2f47f | 418 | return (ECHILD); |
1ad494e6 | 419 | if (uap->options & WNOHANG) { |
1bfd8b20 | 420 | retval[0] = 0; |
d9c2f47f | 421 | return (0); |
a8560fa0 | 422 | } |
1bfd8b20 | 423 | if (error = tsleep((caddr_t)q, PWAIT | PCATCH, "wait", 0)) |
d9c2f47f | 424 | return (error); |
a8560fa0 SL |
425 | goto loop; |
426 | } | |
efe68e1f KM |
427 | |
428 | /* | |
429 | * make process 'parent' the new parent of process 'child'. | |
430 | */ | |
431 | void | |
432 | proc_reparent(child, parent) | |
433 | register struct proc *child; | |
434 | register struct proc *parent; | |
435 | { | |
436 | register struct proc *o; | |
437 | register struct proc *y; | |
438 | ||
439 | if (child->p_pptr == parent) | |
440 | return; | |
441 | ||
442 | /* fix up the child linkage for the old parent */ | |
443 | o = child->p_osptr; | |
444 | y = child->p_ysptr; | |
445 | if (y) | |
446 | y->p_osptr = o; | |
447 | if (o) | |
448 | o->p_ysptr = y; | |
449 | if (child->p_pptr->p_cptr == child) | |
450 | child->p_pptr->p_cptr = o; | |
451 | ||
452 | /* fix up child linkage for new parent */ | |
453 | o = parent->p_cptr; | |
454 | if (o) | |
455 | o->p_ysptr = child; | |
456 | child->p_osptr = o; | |
457 | child->p_ysptr = NULL; | |
458 | parent->p_cptr = child; | |
459 | child->p_pptr = parent; | |
460 | } |