Commit | Line | Data |
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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 | * |
1fa9a14f | 12 | * @(#)kern_exit.c 8.7 (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); | |
1fa9a14f MK |
135 | /* |
136 | * The tty could have been revoked | |
137 | * if we blocked. | |
138 | */ | |
139 | if (sp->s_ttyvp) | |
140 | vgoneall(sp->s_ttyvp); | |
e149007b | 141 | } |
1fa9a14f MK |
142 | if (sp->s_ttyvp) |
143 | vrele(sp->s_ttyvp); | |
a38b908e | 144 | sp->s_ttyvp = NULL; |
61fa8c82 MT |
145 | /* |
146 | * s_ttyp is not zero'd; we use this to indicate | |
147 | * that the session once had a controlling terminal. | |
a38b908e | 148 | * (for logging and informational purposes) |
61fa8c82 | 149 | */ |
1ad494e6 | 150 | } |
e149007b | 151 | sp->s_leader = NULL; |
1ad494e6 | 152 | } |
8429d022 MK |
153 | fixjobc(p, p->p_pgrp, 0); |
154 | p->p_rlimit[RLIMIT_FSIZE].rlim_cur = RLIM_INFINITY; | |
52ec1332 | 155 | (void)acct_process(p); |
1ad494e6 MK |
156 | #ifdef KTRACE |
157 | /* | |
158 | * release trace file | |
159 | */ | |
d06df067 | 160 | p->p_traceflag = 0; /* don't trace the vrele() */ |
1ad494e6 | 161 | if (p->p_tracep) |
c4ec2128 | 162 | vrele(p->p_tracep); |
a8560fa0 | 163 | #endif |
8429d022 MK |
164 | /* |
165 | * Remove proc from allproc queue and pidhash chain. | |
166 | * Place onto zombproc. Unlink from parent's child list. | |
167 | */ | |
cf5ef508 KB |
168 | if (*p->p_prev = p->p_next) |
169 | p->p_next->p_prev = p->p_prev; | |
170 | if (p->p_next = zombproc) | |
171 | p->p_next->p_prev = &p->p_next; | |
1d348849 MK |
172 | p->p_prev = &zombproc; |
173 | zombproc = p; | |
a8560fa0 | 174 | p->p_stat = SZOMB; |
de8789fe | 175 | |
4a438310 MK |
176 | for (pp = &pidhash[PIDHASH(p->p_pid)]; *pp; pp = &(*pp)->p_hash) |
177 | if (*pp == p) { | |
178 | *pp = p->p_hash; | |
179 | goto done; | |
180 | } | |
181 | panic("exit"); | |
182 | done: | |
8429d022 | 183 | |
1d348849 | 184 | if (p->p_cptr) /* only need this if any child is S_ZOMB */ |
8429d022 | 185 | wakeup((caddr_t) initproc); |
1d348849 MK |
186 | for (q = p->p_cptr; q != NULL; q = nq) { |
187 | nq = q->p_osptr; | |
188 | if (nq != NULL) | |
189 | nq->p_ysptr = NULL; | |
8429d022 MK |
190 | if (initproc->p_cptr) |
191 | initproc->p_cptr->p_ysptr = q; | |
192 | q->p_osptr = initproc->p_cptr; | |
1d348849 | 193 | q->p_ysptr = NULL; |
8429d022 | 194 | initproc->p_cptr = q; |
a8560fa0 | 195 | |
8429d022 | 196 | q->p_pptr = initproc; |
1d348849 MK |
197 | /* |
198 | * Traced processes are killed | |
199 | * since their existence means someone is screwing up. | |
1d348849 | 200 | */ |
cf5ef508 KB |
201 | if (q->p_flag & P_TRACED) { |
202 | q->p_flag &= ~P_TRACED; | |
1d348849 | 203 | psignal(q, SIGKILL); |
a8560fa0 | 204 | } |
1d348849 | 205 | } |
bdf8c113 | 206 | p->p_cptr = NULL; |
8429d022 MK |
207 | |
208 | /* | |
509987d3 | 209 | * Save exit status and final rusage info, adding in child rusage |
f3e27f1d | 210 | * info and self times. |
8429d022 MK |
211 | */ |
212 | p->p_xstat = rv; | |
213 | *p->p_ru = p->p_stats->p_ru; | |
509987d3 | 214 | calcru(p, &p->p_ru->ru_utime, &p->p_ru->ru_stime, NULL); |
8429d022 MK |
215 | ruadd(p->p_ru, &p->p_stats->p_cru); |
216 | ||
217 | /* | |
218 | * Notify parent that we're gone. | |
219 | */ | |
a8560fa0 SL |
220 | psignal(p->p_pptr, SIGCHLD); |
221 | wakeup((caddr_t)p->p_pptr); | |
fb1db32c | 222 | #if defined(tahoe) |
e149007b MK |
223 | /* move this to cpu_exit */ |
224 | p->p_addr->u_pcb.pcb_savacc.faddr = (float *)NULL; | |
fb1db32c | 225 | #endif |
de8789fe KM |
226 | /* |
227 | * Clear curproc after we've done all operations | |
228 | * that could block, and before tearing down the rest | |
229 | * of the process state that might be used from clock, etc. | |
230 | * Also, can't clear curproc while we're still runnable, | |
231 | * as we're not on a run queue (we are current, just not | |
232 | * a proper proc any longer!). | |
233 | * | |
234 | * Other substructures are freed from wait(). | |
235 | */ | |
236 | curproc = NULL; | |
237 | if (--p->p_limit->p_refcnt == 0) | |
238 | FREE(p->p_limit, M_SUBPROC); | |
239 | ||
8429d022 | 240 | /* |
e149007b MK |
241 | * Finally, call machine-dependent code to release the remaining |
242 | * resources including address space, the kernel stack and pcb. | |
243 | * The address space is released by "vmspace_free(p->p_vmspace)"; | |
244 | * This is machine-dependent, as we may have to change stacks | |
245 | * or ensure that the current one isn't reallocated before we | |
509987d3 | 246 | * finish. cpu_exit will end with a call to cpu_swtch(), finishing |
e149007b | 247 | * our execution (pun intended). |
8429d022 | 248 | */ |
e149007b | 249 | cpu_exit(p); |
a8560fa0 SL |
250 | } |
251 | ||
9e97623a CT |
252 | struct wait_args { |
253 | int pid; | |
254 | int *status; | |
255 | int options; | |
256 | struct rusage *rusage; | |
257 | #ifdef COMPAT_43 | |
258 | int compat; /* pseudo */ | |
259 | #endif | |
260 | }; | |
261 | ||
1ad494e6 | 262 | #ifdef COMPAT_43 |
2a81c17c | 263 | #if defined(hp300) || defined(luna68k) |
ef07a225 MH |
264 | #include <machine/frame.h> |
265 | #define GETPS(rp) ((struct frame *)(rp))->f_sr | |
266 | #else | |
267 | #define GETPS(rp) (rp)[PS] | |
268 | #endif | |
269 | ||
1bfd8b20 KM |
270 | owait(p, uap, retval) |
271 | struct proc *p; | |
9e97623a | 272 | register struct wait_args *uap; |
1bfd8b20 KM |
273 | int *retval; |
274 | { | |
a8560fa0 | 275 | |
ba0aea50 | 276 | #ifdef PSL_ALLCC |
ef07a225 | 277 | if ((GETPS(p->p_md.md_regs) & PSL_ALLCC) != PSL_ALLCC) { |
c35e8b3f | 278 | uap->options = 0; |
9e97623a | 279 | uap->rusage = NULL; |
1ad494e6 | 280 | } else { |
5d398c16 KM |
281 | uap->options = p->p_md.md_regs[R0]; |
282 | uap->rusage = (struct rusage *)p->p_md.md_regs[R1]; | |
a8560fa0 | 283 | } |
ba0aea50 RC |
284 | #else |
285 | uap->options = 0; | |
9e97623a | 286 | uap->rusage = NULL; |
ba0aea50 | 287 | #endif |
1ad494e6 | 288 | uap->pid = WAIT_ANY; |
9e97623a | 289 | uap->status = NULL; |
a2528931 | 290 | uap->compat = 1; |
d9c2f47f | 291 | return (wait1(p, uap, retval)); |
1ad494e6 MK |
292 | } |
293 | ||
1bfd8b20 KM |
294 | wait4(p, uap, retval) |
295 | struct proc *p; | |
9e97623a | 296 | struct wait_args *uap; |
1bfd8b20 KM |
297 | int *retval; |
298 | { | |
a2528931 MK |
299 | |
300 | uap->compat = 0; | |
d9c2f47f | 301 | return (wait1(p, uap, retval)); |
a8560fa0 | 302 | } |
a2528931 MK |
303 | #else |
304 | #define wait1 wait4 | |
1ad494e6 | 305 | #endif |
a8560fa0 | 306 | |
cb84e0ab | 307 | int |
1bfd8b20 KM |
308 | wait1(q, uap, retval) |
309 | register struct proc *q; | |
9e97623a | 310 | register struct wait_args *uap; |
1bfd8b20 KM |
311 | int retval[]; |
312 | { | |
8429d022 | 313 | register int nfound; |
efe68e1f | 314 | register struct proc *p, *t; |
a2528931 | 315 | int status, error; |
a8560fa0 | 316 | |
1ad494e6 MK |
317 | if (uap->pid == 0) |
318 | uap->pid = -q->p_pgid; | |
c35e8b3f | 319 | #ifdef notyet |
a2528931 | 320 | if (uap->options &~ (WUNTRACED|WNOHANG)) |
d9c2f47f | 321 | return (EINVAL); |
c35e8b3f | 322 | #endif |
1ad494e6 | 323 | loop: |
8429d022 | 324 | nfound = 0; |
1d348849 | 325 | for (p = q->p_cptr; p; p = p->p_osptr) { |
1ad494e6 MK |
326 | if (uap->pid != WAIT_ANY && |
327 | p->p_pid != uap->pid && p->p_pgid != -uap->pid) | |
328 | continue; | |
8429d022 | 329 | nfound++; |
a8560fa0 | 330 | if (p->p_stat == SZOMB) { |
1bfd8b20 | 331 | retval[0] = p->p_pid; |
1ad494e6 | 332 | #ifdef COMPAT_43 |
a2528931 | 333 | if (uap->compat) |
1bfd8b20 | 334 | retval[1] = p->p_xstat; |
1ad494e6 MK |
335 | else |
336 | #endif | |
337 | if (uap->status) { | |
a2528931 MK |
338 | status = p->p_xstat; /* convert to int */ |
339 | if (error = copyout((caddr_t)&status, | |
1ad494e6 | 340 | (caddr_t)uap->status, sizeof(status))) |
d9c2f47f | 341 | return (error); |
5e63dd78 | 342 | } |
a2528931 MK |
343 | if (uap->rusage && (error = copyout((caddr_t)p->p_ru, |
344 | (caddr_t)uap->rusage, sizeof (struct rusage)))) | |
d9c2f47f | 345 | return (error); |
efe68e1f KM |
346 | /* |
347 | * If we got the child via a ptrace 'attach', | |
348 | * we need to give it back to the old parent. | |
349 | */ | |
350 | if (p->p_oppid && (t = pfind(p->p_oppid))) { | |
351 | p->p_oppid = 0; | |
352 | proc_reparent(p, t); | |
353 | psignal(t, SIGCHLD); | |
354 | wakeup((caddr_t)t); | |
355 | return (0); | |
356 | } | |
1ad494e6 | 357 | p->p_xstat = 0; |
8429d022 | 358 | ruadd(&q->p_stats->p_cru, p->p_ru); |
1ad494e6 | 359 | FREE(p->p_ru, M_ZOMBIE); |
db8fc89d KM |
360 | |
361 | /* | |
362 | * Decrement the count of procs running with this uid. | |
363 | */ | |
364 | (void)chgproccnt(p->p_cred->p_ruid, -1); | |
365 | ||
366 | /* | |
367 | * Free up credentials. | |
368 | */ | |
fe3cec6e MK |
369 | if (--p->p_cred->p_refcnt == 0) { |
370 | crfree(p->p_cred->pc_ucred); | |
371 | FREE(p->p_cred, M_SUBPROC); | |
372 | } | |
8429d022 | 373 | |
859437ef JSP |
374 | /* |
375 | * Release reference to text vnode | |
376 | */ | |
377 | if (p->p_textvp) | |
378 | vrele(p->p_textvp); | |
379 | ||
8429d022 MK |
380 | /* |
381 | * Finally finished with old proc entry. | |
382 | * Unlink it from its process group and free it. | |
383 | */ | |
384 | leavepgrp(p); | |
cf5ef508 KB |
385 | if (*p->p_prev = p->p_next) /* off zombproc */ |
386 | p->p_next->p_prev = p->p_prev; | |
a8560fa0 SL |
387 | if (q = p->p_ysptr) |
388 | q->p_osptr = p->p_osptr; | |
389 | if (q = p->p_osptr) | |
390 | q->p_ysptr = p->p_ysptr; | |
391 | if ((q = p->p_pptr)->p_cptr == p) | |
392 | q->p_cptr = p->p_osptr; | |
4021f565 | 393 | |
fe3cec6e MK |
394 | /* |
395 | * Give machine-dependent layer a chance | |
396 | * to free anything that cpu_exit couldn't | |
397 | * release while still running in process context. | |
398 | */ | |
399 | cpu_wait(p); | |
8429d022 MK |
400 | FREE(p, M_PROC); |
401 | nprocs--; | |
d9c2f47f | 402 | return (0); |
a8560fa0 | 403 | } |
cf5ef508 KB |
404 | if (p->p_stat == SSTOP && (p->p_flag & P_WAITED) == 0 && |
405 | (p->p_flag & P_TRACED || uap->options & WUNTRACED)) { | |
406 | p->p_flag |= P_WAITED; | |
1bfd8b20 | 407 | retval[0] = p->p_pid; |
1ad494e6 | 408 | #ifdef COMPAT_43 |
85d629e3 | 409 | if (uap->compat) { |
19dec745 | 410 | retval[1] = W_STOPCODE(p->p_xstat); |
85d629e3 KM |
411 | error = 0; |
412 | } else | |
1ad494e6 MK |
413 | #endif |
414 | if (uap->status) { | |
19dec745 | 415 | status = W_STOPCODE(p->p_xstat); |
a2528931 | 416 | error = copyout((caddr_t)&status, |
ba0aea50 | 417 | (caddr_t)uap->status, sizeof(status)); |
a2528931 MK |
418 | } else |
419 | error = 0; | |
d9c2f47f | 420 | return (error); |
a8560fa0 SL |
421 | } |
422 | } | |
8429d022 | 423 | if (nfound == 0) |
d9c2f47f | 424 | return (ECHILD); |
1ad494e6 | 425 | if (uap->options & WNOHANG) { |
1bfd8b20 | 426 | retval[0] = 0; |
d9c2f47f | 427 | return (0); |
a8560fa0 | 428 | } |
1bfd8b20 | 429 | if (error = tsleep((caddr_t)q, PWAIT | PCATCH, "wait", 0)) |
d9c2f47f | 430 | return (error); |
a8560fa0 SL |
431 | goto loop; |
432 | } | |
efe68e1f KM |
433 | |
434 | /* | |
435 | * make process 'parent' the new parent of process 'child'. | |
436 | */ | |
437 | void | |
438 | proc_reparent(child, parent) | |
439 | register struct proc *child; | |
440 | register struct proc *parent; | |
441 | { | |
442 | register struct proc *o; | |
443 | register struct proc *y; | |
444 | ||
445 | if (child->p_pptr == parent) | |
446 | return; | |
447 | ||
448 | /* fix up the child linkage for the old parent */ | |
449 | o = child->p_osptr; | |
450 | y = child->p_ysptr; | |
451 | if (y) | |
452 | y->p_osptr = o; | |
453 | if (o) | |
454 | o->p_ysptr = y; | |
455 | if (child->p_pptr->p_cptr == child) | |
456 | child->p_pptr->p_cptr = o; | |
457 | ||
458 | /* fix up child linkage for new parent */ | |
459 | o = parent->p_cptr; | |
460 | if (o) | |
461 | o->p_ysptr = child; | |
462 | child->p_osptr = o; | |
463 | child->p_ysptr = NULL; | |
464 | parent->p_cptr = child; | |
465 | child->p_pptr = parent; | |
466 | } |