Commit | Line | Data |
---|---|---|
da7c5cc6 | 1 | /* |
8429d022 | 2 | * Copyright (c) 1982, 1986, 1989, 1991 Regents of the University of California. |
c4ec2128 | 3 | * All rights reserved. |
da7c5cc6 | 4 | * |
dbf0c423 | 5 | * %sccs.include.redist.c% |
c4ec2128 | 6 | * |
f3e27f1d | 7 | * @(#)kern_exit.c 7.47 (Berkeley) %G% |
da7c5cc6 | 8 | */ |
a8560fa0 | 9 | |
94368568 JB |
10 | #include "param.h" |
11 | #include "systm.h" | |
12 | #include "map.h" | |
1bfd8b20 | 13 | #include "ioctl.h" |
063b2136 | 14 | #include "proc.h" |
1bfd8b20 | 15 | #include "tty.h" |
8429d022 MK |
16 | #include "time.h" |
17 | #include "resource.h" | |
94368568 | 18 | #include "kernel.h" |
94368568 JB |
19 | #include "buf.h" |
20 | #include "wait.h" | |
94368568 | 21 | #include "file.h" |
c4ec2128 | 22 | #include "vnode.h" |
5e63dd78 | 23 | #include "syslog.h" |
61d22ffc | 24 | #include "malloc.h" |
9a5334ea | 25 | #include "resourcevar.h" |
efe68e1f | 26 | #include "ptrace.h" |
a8560fa0 | 27 | |
e149007b | 28 | #include "machine/cpu.h" |
1ad494e6 | 29 | #ifdef COMPAT_43 |
8429d022 | 30 | #include "machine/reg.h" |
d301d150 | 31 | #include "machine/psl.h" |
1ad494e6 MK |
32 | #endif |
33 | ||
9a5334ea | 34 | #include "vm/vm.h" |
8429d022 | 35 | #include "vm/vm_kern.h" |
9db58063 | 36 | |
a8560fa0 SL |
37 | /* |
38 | * Exit system call: pass back caller's arg | |
39 | */ | |
1bfd8b20 KM |
40 | /* ARGSUSED */ |
41 | rexit(p, uap, retval) | |
42 | struct proc *p; | |
43 | struct args { | |
a8560fa0 SL |
44 | int rval; |
45 | } *uap; | |
1bfd8b20 KM |
46 | int *retval; |
47 | { | |
a8560fa0 | 48 | |
5360383b MK |
49 | exit(p, W_EXITCODE(uap->rval, 0)); |
50 | /* NOTREACHED */ | |
a8560fa0 SL |
51 | } |
52 | ||
53 | /* | |
8429d022 MK |
54 | * Exit: deallocate address space and other resources, |
55 | * change proc state to zombie, and unlink proc from allproc | |
56 | * and parent's lists. Save exit status and rusage for wait(). | |
57 | * Check for child processes and orphan them. | |
a8560fa0 | 58 | */ |
1bfd8b20 | 59 | exit(p, rv) |
8429d022 | 60 | register struct proc *p; |
c35e8b3f | 61 | int rv; |
a8560fa0 | 62 | { |
1bfd8b20 | 63 | register struct proc *q, *nq; |
4a438310 | 64 | register struct proc **pp; |
7322266f | 65 | register struct vmspace *vm; |
8429d022 | 66 | int s; |
a8560fa0 | 67 | |
efe68e1f KM |
68 | if (p->p_pid == 1) |
69 | panic("init died (signal %d, exit %d)", | |
70 | WTERMSIG(rv), WEXITSTATUS(rv)); | |
a8560fa0 SL |
71 | #ifdef PGINPROF |
72 | vmsizmon(); | |
73 | #endif | |
e0ef57b1 KM |
74 | if (p->p_flag & SPROFIL) |
75 | stopprofclock(p); | |
61d22ffc KM |
76 | MALLOC(p->p_ru, struct rusage *, sizeof(struct rusage), |
77 | M_ZOMBIE, M_WAITOK); | |
8429d022 MK |
78 | /* |
79 | * If parent is waiting for us to exit or exec, | |
80 | * SPPWAIT is set; we will wakeup the parent below. | |
81 | */ | |
9a5334ea | 82 | p->p_flag &= ~(STRC|SPPWAIT); |
a8560fa0 | 83 | p->p_flag |= SWEXIT; |
dd012d1e | 84 | p->p_sigignore = ~0; |
a2528931 | 85 | p->p_sig = 0; |
a8560fa0 | 86 | untimeout(realitexpire, (caddr_t)p); |
8429d022 MK |
87 | |
88 | /* | |
89 | * Close open files and release open-file table. | |
90 | * This may block! | |
91 | */ | |
92 | fdfree(p); | |
fe3cec6e MK |
93 | |
94 | /* The next two chunks should probably be moved to vmspace_exit. */ | |
7322266f | 95 | vm = p->p_vmspace; |
9db58063 | 96 | #ifdef SYSVSHM |
7322266f | 97 | if (vm->vm_shm) |
9db58063 KM |
98 | shmexit(p); |
99 | #endif | |
fe3cec6e MK |
100 | /* |
101 | * Release user portion of address space. | |
102 | * This releases references to vnodes, | |
103 | * which could cause I/O if the file has been unlinked. | |
104 | * Need to do this early enough that we can still sleep. | |
105 | * Can't free the entire vmspace as the kernel stack | |
106 | * may be mapped within that space also. | |
107 | */ | |
7322266f KM |
108 | if (vm->vm_refcnt == 1) |
109 | (void) vm_map_remove(&vm->vm_map, VM_MIN_ADDRESS, | |
fe3cec6e | 110 | VM_MAXUSER_ADDRESS); |
8429d022 | 111 | |
1ad494e6 | 112 | if (SESS_LEADER(p)) { |
a38b908e MT |
113 | register struct session *sp = p->p_session; |
114 | ||
115 | if (sp->s_ttyvp) { | |
116 | /* | |
117 | * Controlling process. | |
e149007b MK |
118 | * Signal foreground pgrp, |
119 | * drain controlling terminal | |
120 | * and revoke access to controlling terminal. | |
a38b908e | 121 | */ |
e149007b MK |
122 | if (sp->s_ttyp->t_session == sp) { |
123 | if (sp->s_ttyp->t_pgrp) | |
124 | pgsignal(sp->s_ttyp->t_pgrp, SIGHUP, 1); | |
125 | (void) ttywait(sp->s_ttyp); | |
126 | vgoneall(sp->s_ttyvp); | |
127 | } | |
a38b908e MT |
128 | vrele(sp->s_ttyvp); |
129 | sp->s_ttyvp = NULL; | |
61fa8c82 MT |
130 | /* |
131 | * s_ttyp is not zero'd; we use this to indicate | |
132 | * that the session once had a controlling terminal. | |
a38b908e | 133 | * (for logging and informational purposes) |
61fa8c82 | 134 | */ |
1ad494e6 | 135 | } |
e149007b | 136 | sp->s_leader = NULL; |
1ad494e6 | 137 | } |
8429d022 MK |
138 | fixjobc(p, p->p_pgrp, 0); |
139 | p->p_rlimit[RLIMIT_FSIZE].rlim_cur = RLIM_INFINITY; | |
d120e510 | 140 | (void) acct(p); |
1ad494e6 MK |
141 | #ifdef KTRACE |
142 | /* | |
143 | * release trace file | |
144 | */ | |
d06df067 | 145 | p->p_traceflag = 0; /* don't trace the vrele() */ |
1ad494e6 | 146 | if (p->p_tracep) |
c4ec2128 | 147 | vrele(p->p_tracep); |
a8560fa0 | 148 | #endif |
8429d022 MK |
149 | /* |
150 | * Remove proc from allproc queue and pidhash chain. | |
151 | * Place onto zombproc. Unlink from parent's child list. | |
152 | */ | |
153 | if (*p->p_prev = p->p_nxt) | |
1d348849 | 154 | p->p_nxt->p_prev = p->p_prev; |
8429d022 | 155 | if (p->p_nxt = zombproc) |
1d348849 MK |
156 | p->p_nxt->p_prev = &p->p_nxt; |
157 | p->p_prev = &zombproc; | |
158 | zombproc = p; | |
a8560fa0 | 159 | p->p_stat = SZOMB; |
de8789fe | 160 | |
4a438310 MK |
161 | for (pp = &pidhash[PIDHASH(p->p_pid)]; *pp; pp = &(*pp)->p_hash) |
162 | if (*pp == p) { | |
163 | *pp = p->p_hash; | |
164 | goto done; | |
165 | } | |
166 | panic("exit"); | |
167 | done: | |
8429d022 | 168 | |
1d348849 | 169 | if (p->p_cptr) /* only need this if any child is S_ZOMB */ |
8429d022 | 170 | wakeup((caddr_t) initproc); |
1d348849 MK |
171 | for (q = p->p_cptr; q != NULL; q = nq) { |
172 | nq = q->p_osptr; | |
173 | if (nq != NULL) | |
174 | nq->p_ysptr = NULL; | |
8429d022 MK |
175 | if (initproc->p_cptr) |
176 | initproc->p_cptr->p_ysptr = q; | |
177 | q->p_osptr = initproc->p_cptr; | |
1d348849 | 178 | q->p_ysptr = NULL; |
8429d022 | 179 | initproc->p_cptr = q; |
a8560fa0 | 180 | |
8429d022 | 181 | q->p_pptr = initproc; |
1d348849 MK |
182 | /* |
183 | * Traced processes are killed | |
184 | * since their existence means someone is screwing up. | |
1d348849 MK |
185 | */ |
186 | if (q->p_flag&STRC) { | |
187 | q->p_flag &= ~STRC; | |
188 | psignal(q, SIGKILL); | |
a8560fa0 | 189 | } |
1d348849 | 190 | } |
bdf8c113 | 191 | p->p_cptr = NULL; |
8429d022 MK |
192 | |
193 | /* | |
509987d3 | 194 | * Save exit status and final rusage info, adding in child rusage |
f3e27f1d | 195 | * info and self times. |
8429d022 MK |
196 | */ |
197 | p->p_xstat = rv; | |
198 | *p->p_ru = p->p_stats->p_ru; | |
509987d3 | 199 | calcru(p, &p->p_ru->ru_utime, &p->p_ru->ru_stime, NULL); |
8429d022 MK |
200 | ruadd(p->p_ru, &p->p_stats->p_cru); |
201 | ||
202 | /* | |
203 | * Notify parent that we're gone. | |
204 | */ | |
a8560fa0 SL |
205 | psignal(p->p_pptr, SIGCHLD); |
206 | wakeup((caddr_t)p->p_pptr); | |
fb1db32c | 207 | #if defined(tahoe) |
e149007b MK |
208 | /* move this to cpu_exit */ |
209 | p->p_addr->u_pcb.pcb_savacc.faddr = (float *)NULL; | |
fb1db32c | 210 | #endif |
de8789fe KM |
211 | /* |
212 | * Clear curproc after we've done all operations | |
213 | * that could block, and before tearing down the rest | |
214 | * of the process state that might be used from clock, etc. | |
215 | * Also, can't clear curproc while we're still runnable, | |
216 | * as we're not on a run queue (we are current, just not | |
217 | * a proper proc any longer!). | |
218 | * | |
219 | * Other substructures are freed from wait(). | |
220 | */ | |
221 | curproc = NULL; | |
222 | if (--p->p_limit->p_refcnt == 0) | |
223 | FREE(p->p_limit, M_SUBPROC); | |
224 | ||
8429d022 | 225 | /* |
e149007b MK |
226 | * Finally, call machine-dependent code to release the remaining |
227 | * resources including address space, the kernel stack and pcb. | |
228 | * The address space is released by "vmspace_free(p->p_vmspace)"; | |
229 | * This is machine-dependent, as we may have to change stacks | |
230 | * or ensure that the current one isn't reallocated before we | |
509987d3 | 231 | * finish. cpu_exit will end with a call to cpu_swtch(), finishing |
e149007b | 232 | * our execution (pun intended). |
8429d022 | 233 | */ |
e149007b | 234 | cpu_exit(p); |
8429d022 | 235 | /* NOTREACHED */ |
a8560fa0 SL |
236 | } |
237 | ||
1ad494e6 | 238 | #ifdef COMPAT_43 |
1bfd8b20 KM |
239 | owait(p, uap, retval) |
240 | struct proc *p; | |
241 | register struct args { | |
1ad494e6 | 242 | int pid; |
a2528931 | 243 | int *status; |
1ad494e6 MK |
244 | int options; |
245 | struct rusage *rusage; | |
a2528931 | 246 | int compat; |
1bfd8b20 KM |
247 | } *uap; |
248 | int *retval; | |
249 | { | |
a8560fa0 | 250 | |
ba0aea50 | 251 | #ifdef PSL_ALLCC |
5d398c16 | 252 | if ((p->p_md.md_regs[PS] & PSL_ALLCC) != PSL_ALLCC) { |
c35e8b3f | 253 | uap->options = 0; |
1ad494e6 MK |
254 | uap->rusage = 0; |
255 | } else { | |
5d398c16 KM |
256 | uap->options = p->p_md.md_regs[R0]; |
257 | uap->rusage = (struct rusage *)p->p_md.md_regs[R1]; | |
a8560fa0 | 258 | } |
ba0aea50 RC |
259 | #else |
260 | uap->options = 0; | |
261 | uap->rusage = 0; | |
262 | #endif | |
1ad494e6 MK |
263 | uap->pid = WAIT_ANY; |
264 | uap->status = 0; | |
a2528931 | 265 | uap->compat = 1; |
d9c2f47f | 266 | return (wait1(p, uap, retval)); |
1ad494e6 MK |
267 | } |
268 | ||
1bfd8b20 KM |
269 | wait4(p, uap, retval) |
270 | struct proc *p; | |
271 | struct args { | |
a2528931 MK |
272 | int pid; |
273 | int *status; | |
274 | int options; | |
275 | struct rusage *rusage; | |
276 | int compat; | |
1bfd8b20 KM |
277 | } *uap; |
278 | int *retval; | |
279 | { | |
a2528931 MK |
280 | |
281 | uap->compat = 0; | |
d9c2f47f | 282 | return (wait1(p, uap, retval)); |
a8560fa0 | 283 | } |
a2528931 MK |
284 | #else |
285 | #define wait1 wait4 | |
1ad494e6 | 286 | #endif |
a8560fa0 | 287 | |
a8560fa0 | 288 | /* |
8429d022 MK |
289 | * Wait: check child processes to see if any have exited, |
290 | * stopped under trace, or (optionally) stopped by a signal. | |
291 | * Pass back status and deallocate exited child's proc structure. | |
a8560fa0 | 292 | */ |
1bfd8b20 KM |
293 | wait1(q, uap, retval) |
294 | register struct proc *q; | |
295 | register struct args { | |
1ad494e6 | 296 | int pid; |
a2528931 | 297 | int *status; |
1ad494e6 MK |
298 | int options; |
299 | struct rusage *rusage; | |
a2528931 MK |
300 | #ifdef COMPAT_43 |
301 | int compat; | |
302 | #endif | |
1bfd8b20 KM |
303 | } *uap; |
304 | int retval[]; | |
305 | { | |
8429d022 | 306 | register int nfound; |
efe68e1f | 307 | register struct proc *p, *t; |
a2528931 | 308 | int status, error; |
a8560fa0 | 309 | |
1ad494e6 MK |
310 | if (uap->pid == 0) |
311 | uap->pid = -q->p_pgid; | |
c35e8b3f | 312 | #ifdef notyet |
a2528931 | 313 | if (uap->options &~ (WUNTRACED|WNOHANG)) |
d9c2f47f | 314 | return (EINVAL); |
c35e8b3f | 315 | #endif |
1ad494e6 | 316 | loop: |
8429d022 | 317 | nfound = 0; |
1d348849 | 318 | for (p = q->p_cptr; p; p = p->p_osptr) { |
1ad494e6 MK |
319 | if (uap->pid != WAIT_ANY && |
320 | p->p_pid != uap->pid && p->p_pgid != -uap->pid) | |
321 | continue; | |
8429d022 | 322 | nfound++; |
a8560fa0 | 323 | if (p->p_stat == SZOMB) { |
1bfd8b20 | 324 | retval[0] = p->p_pid; |
1ad494e6 | 325 | #ifdef COMPAT_43 |
a2528931 | 326 | if (uap->compat) |
1bfd8b20 | 327 | retval[1] = p->p_xstat; |
1ad494e6 MK |
328 | else |
329 | #endif | |
330 | if (uap->status) { | |
a2528931 MK |
331 | status = p->p_xstat; /* convert to int */ |
332 | if (error = copyout((caddr_t)&status, | |
1ad494e6 | 333 | (caddr_t)uap->status, sizeof(status))) |
d9c2f47f | 334 | return (error); |
5e63dd78 | 335 | } |
a2528931 MK |
336 | if (uap->rusage && (error = copyout((caddr_t)p->p_ru, |
337 | (caddr_t)uap->rusage, sizeof (struct rusage)))) | |
d9c2f47f | 338 | return (error); |
efe68e1f KM |
339 | /* |
340 | * If we got the child via a ptrace 'attach', | |
341 | * we need to give it back to the old parent. | |
342 | */ | |
343 | if (p->p_oppid && (t = pfind(p->p_oppid))) { | |
344 | p->p_oppid = 0; | |
345 | proc_reparent(p, t); | |
346 | psignal(t, SIGCHLD); | |
347 | wakeup((caddr_t)t); | |
348 | return (0); | |
349 | } | |
1ad494e6 | 350 | p->p_xstat = 0; |
8429d022 | 351 | ruadd(&q->p_stats->p_cru, p->p_ru); |
1ad494e6 | 352 | FREE(p->p_ru, M_ZOMBIE); |
fe3cec6e MK |
353 | if (--p->p_cred->p_refcnt == 0) { |
354 | crfree(p->p_cred->pc_ucred); | |
355 | FREE(p->p_cred, M_SUBPROC); | |
356 | } | |
8429d022 MK |
357 | |
358 | /* | |
359 | * Finally finished with old proc entry. | |
360 | * Unlink it from its process group and free it. | |
361 | */ | |
362 | leavepgrp(p); | |
1d348849 MK |
363 | if (*p->p_prev = p->p_nxt) /* off zombproc */ |
364 | p->p_nxt->p_prev = p->p_prev; | |
a8560fa0 SL |
365 | if (q = p->p_ysptr) |
366 | q->p_osptr = p->p_osptr; | |
367 | if (q = p->p_osptr) | |
368 | q->p_ysptr = p->p_ysptr; | |
369 | if ((q = p->p_pptr)->p_cptr == p) | |
370 | q->p_cptr = p->p_osptr; | |
4021f565 | 371 | |
fe3cec6e MK |
372 | /* |
373 | * Give machine-dependent layer a chance | |
374 | * to free anything that cpu_exit couldn't | |
375 | * release while still running in process context. | |
376 | */ | |
377 | cpu_wait(p); | |
8429d022 MK |
378 | FREE(p, M_PROC); |
379 | nprocs--; | |
d9c2f47f | 380 | return (0); |
a8560fa0 | 381 | } |
1ad494e6 MK |
382 | if (p->p_stat == SSTOP && (p->p_flag & SWTED) == 0 && |
383 | (p->p_flag & STRC || uap->options & WUNTRACED)) { | |
a8560fa0 | 384 | p->p_flag |= SWTED; |
1bfd8b20 | 385 | retval[0] = p->p_pid; |
1ad494e6 | 386 | #ifdef COMPAT_43 |
85d629e3 | 387 | if (uap->compat) { |
19dec745 | 388 | retval[1] = W_STOPCODE(p->p_xstat); |
85d629e3 KM |
389 | error = 0; |
390 | } else | |
1ad494e6 MK |
391 | #endif |
392 | if (uap->status) { | |
19dec745 | 393 | status = W_STOPCODE(p->p_xstat); |
a2528931 | 394 | error = copyout((caddr_t)&status, |
ba0aea50 | 395 | (caddr_t)uap->status, sizeof(status)); |
a2528931 MK |
396 | } else |
397 | error = 0; | |
d9c2f47f | 398 | return (error); |
a8560fa0 SL |
399 | } |
400 | } | |
8429d022 | 401 | if (nfound == 0) |
d9c2f47f | 402 | return (ECHILD); |
1ad494e6 | 403 | if (uap->options & WNOHANG) { |
1bfd8b20 | 404 | retval[0] = 0; |
d9c2f47f | 405 | return (0); |
a8560fa0 | 406 | } |
1bfd8b20 | 407 | if (error = tsleep((caddr_t)q, PWAIT | PCATCH, "wait", 0)) |
d9c2f47f | 408 | return (error); |
a8560fa0 SL |
409 | goto loop; |
410 | } | |
efe68e1f KM |
411 | |
412 | /* | |
413 | * make process 'parent' the new parent of process 'child'. | |
414 | */ | |
415 | void | |
416 | proc_reparent(child, parent) | |
417 | register struct proc *child; | |
418 | register struct proc *parent; | |
419 | { | |
420 | register struct proc *o; | |
421 | register struct proc *y; | |
422 | ||
423 | if (child->p_pptr == parent) | |
424 | return; | |
425 | ||
426 | /* fix up the child linkage for the old parent */ | |
427 | o = child->p_osptr; | |
428 | y = child->p_ysptr; | |
429 | if (y) | |
430 | y->p_osptr = o; | |
431 | if (o) | |
432 | o->p_ysptr = y; | |
433 | if (child->p_pptr->p_cptr == child) | |
434 | child->p_pptr->p_cptr = o; | |
435 | ||
436 | /* fix up child linkage for new parent */ | |
437 | o = parent->p_cptr; | |
438 | if (o) | |
439 | o->p_ysptr = child; | |
440 | child->p_osptr = o; | |
441 | child->p_ysptr = NULL; | |
442 | parent->p_cptr = child; | |
443 | child->p_pptr = parent; | |
444 | } |