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 | * |
817f339a | 7 | * @(#)kern_exit.c 7.52 (Berkeley) %G% |
da7c5cc6 | 8 | */ |
a8560fa0 | 9 | |
38a01dbe KB |
10 | #include <sys/param.h> |
11 | #include <sys/systm.h> | |
12 | #include <sys/map.h> | |
13 | #include <sys/ioctl.h> | |
14 | #include <sys/proc.h> | |
15 | #include <sys/tty.h> | |
16 | #include <sys/time.h> | |
17 | #include <sys/resource.h> | |
18 | #include <sys/kernel.h> | |
19 | #include <sys/buf.h> | |
20 | #include <sys/wait.h> | |
21 | #include <sys/file.h> | |
22 | #include <sys/vnode.h> | |
23 | #include <sys/syslog.h> | |
24 | #include <sys/malloc.h> | |
25 | #include <sys/resourcevar.h> | |
26 | #include <sys/ptrace.h> | |
a8560fa0 | 27 | |
38a01dbe | 28 | #include <machine/cpu.h> |
1ad494e6 | 29 | #ifdef COMPAT_43 |
38a01dbe KB |
30 | #include <machine/reg.h> |
31 | #include <machine/psl.h> | |
1ad494e6 MK |
32 | #endif |
33 | ||
38a01dbe KB |
34 | #include <vm/vm.h> |
35 | #include <vm/vm_kern.h> | |
9db58063 | 36 | |
a8560fa0 SL |
37 | /* |
38 | * Exit system call: pass back caller's arg | |
39 | */ | |
9e97623a CT |
40 | struct rexit_args { |
41 | int rval; | |
42 | }; | |
1bfd8b20 KM |
43 | /* ARGSUSED */ |
44 | rexit(p, uap, retval) | |
45 | struct proc *p; | |
9e97623a | 46 | struct rexit_args *uap; |
1bfd8b20 KM |
47 | int *retval; |
48 | { | |
a8560fa0 | 49 | |
817f339a | 50 | exit1(p, W_EXITCODE(uap->rval, 0)); |
5360383b | 51 | /* NOTREACHED */ |
a8560fa0 SL |
52 | } |
53 | ||
54 | /* | |
8429d022 MK |
55 | * Exit: deallocate address space and other resources, |
56 | * change proc state to zombie, and unlink proc from allproc | |
57 | * and parent's lists. Save exit status and rusage for wait(). | |
58 | * Check for child processes and orphan them. | |
a8560fa0 | 59 | */ |
817f339a | 60 | exit1(p, rv) |
8429d022 | 61 | register struct proc *p; |
c35e8b3f | 62 | int rv; |
a8560fa0 | 63 | { |
1bfd8b20 | 64 | register struct proc *q, *nq; |
4a438310 | 65 | register struct proc **pp; |
7322266f | 66 | register struct vmspace *vm; |
8429d022 | 67 | int s; |
a8560fa0 | 68 | |
efe68e1f KM |
69 | if (p->p_pid == 1) |
70 | panic("init died (signal %d, exit %d)", | |
71 | WTERMSIG(rv), WEXITSTATUS(rv)); | |
a8560fa0 SL |
72 | #ifdef PGINPROF |
73 | vmsizmon(); | |
74 | #endif | |
e0ef57b1 KM |
75 | if (p->p_flag & SPROFIL) |
76 | stopprofclock(p); | |
61d22ffc KM |
77 | MALLOC(p->p_ru, struct rusage *, sizeof(struct rusage), |
78 | M_ZOMBIE, M_WAITOK); | |
8429d022 MK |
79 | /* |
80 | * If parent is waiting for us to exit or exec, | |
81 | * SPPWAIT is set; we will wakeup the parent below. | |
82 | */ | |
9a5334ea | 83 | p->p_flag &= ~(STRC|SPPWAIT); |
a8560fa0 | 84 | p->p_flag |= SWEXIT; |
dd012d1e | 85 | p->p_sigignore = ~0; |
a2528931 | 86 | p->p_sig = 0; |
a8560fa0 | 87 | untimeout(realitexpire, (caddr_t)p); |
8429d022 MK |
88 | |
89 | /* | |
90 | * Close open files and release open-file table. | |
91 | * This may block! | |
92 | */ | |
93 | fdfree(p); | |
fe3cec6e MK |
94 | |
95 | /* The next two chunks should probably be moved to vmspace_exit. */ | |
7322266f | 96 | vm = p->p_vmspace; |
9db58063 | 97 | #ifdef SYSVSHM |
7322266f | 98 | if (vm->vm_shm) |
9db58063 KM |
99 | shmexit(p); |
100 | #endif | |
fe3cec6e MK |
101 | /* |
102 | * Release user portion of address space. | |
103 | * This releases references to vnodes, | |
104 | * which could cause I/O if the file has been unlinked. | |
105 | * Need to do this early enough that we can still sleep. | |
106 | * Can't free the entire vmspace as the kernel stack | |
107 | * may be mapped within that space also. | |
108 | */ | |
7322266f KM |
109 | if (vm->vm_refcnt == 1) |
110 | (void) vm_map_remove(&vm->vm_map, VM_MIN_ADDRESS, | |
fe3cec6e | 111 | VM_MAXUSER_ADDRESS); |
8429d022 | 112 | |
1ad494e6 | 113 | if (SESS_LEADER(p)) { |
a38b908e MT |
114 | register struct session *sp = p->p_session; |
115 | ||
116 | if (sp->s_ttyvp) { | |
117 | /* | |
118 | * Controlling process. | |
e149007b MK |
119 | * Signal foreground pgrp, |
120 | * drain controlling terminal | |
121 | * and revoke access to controlling terminal. | |
a38b908e | 122 | */ |
e149007b MK |
123 | if (sp->s_ttyp->t_session == sp) { |
124 | if (sp->s_ttyp->t_pgrp) | |
125 | pgsignal(sp->s_ttyp->t_pgrp, SIGHUP, 1); | |
126 | (void) ttywait(sp->s_ttyp); | |
127 | vgoneall(sp->s_ttyvp); | |
128 | } | |
a38b908e MT |
129 | vrele(sp->s_ttyvp); |
130 | sp->s_ttyvp = NULL; | |
61fa8c82 MT |
131 | /* |
132 | * s_ttyp is not zero'd; we use this to indicate | |
133 | * that the session once had a controlling terminal. | |
a38b908e | 134 | * (for logging and informational purposes) |
61fa8c82 | 135 | */ |
1ad494e6 | 136 | } |
e149007b | 137 | sp->s_leader = NULL; |
1ad494e6 | 138 | } |
8429d022 MK |
139 | fixjobc(p, p->p_pgrp, 0); |
140 | p->p_rlimit[RLIMIT_FSIZE].rlim_cur = RLIM_INFINITY; | |
d120e510 | 141 | (void) acct(p); |
1ad494e6 MK |
142 | #ifdef KTRACE |
143 | /* | |
144 | * release trace file | |
145 | */ | |
d06df067 | 146 | p->p_traceflag = 0; /* don't trace the vrele() */ |
1ad494e6 | 147 | if (p->p_tracep) |
c4ec2128 | 148 | vrele(p->p_tracep); |
a8560fa0 | 149 | #endif |
8429d022 MK |
150 | /* |
151 | * Remove proc from allproc queue and pidhash chain. | |
152 | * Place onto zombproc. Unlink from parent's child list. | |
153 | */ | |
154 | if (*p->p_prev = p->p_nxt) | |
1d348849 | 155 | p->p_nxt->p_prev = p->p_prev; |
8429d022 | 156 | if (p->p_nxt = zombproc) |
1d348849 MK |
157 | p->p_nxt->p_prev = &p->p_nxt; |
158 | p->p_prev = &zombproc; | |
159 | zombproc = p; | |
a8560fa0 | 160 | p->p_stat = SZOMB; |
de8789fe | 161 | |
4a438310 MK |
162 | for (pp = &pidhash[PIDHASH(p->p_pid)]; *pp; pp = &(*pp)->p_hash) |
163 | if (*pp == p) { | |
164 | *pp = p->p_hash; | |
165 | goto done; | |
166 | } | |
167 | panic("exit"); | |
168 | done: | |
8429d022 | 169 | |
1d348849 | 170 | if (p->p_cptr) /* only need this if any child is S_ZOMB */ |
8429d022 | 171 | wakeup((caddr_t) initproc); |
1d348849 MK |
172 | for (q = p->p_cptr; q != NULL; q = nq) { |
173 | nq = q->p_osptr; | |
174 | if (nq != NULL) | |
175 | nq->p_ysptr = NULL; | |
8429d022 MK |
176 | if (initproc->p_cptr) |
177 | initproc->p_cptr->p_ysptr = q; | |
178 | q->p_osptr = initproc->p_cptr; | |
1d348849 | 179 | q->p_ysptr = NULL; |
8429d022 | 180 | initproc->p_cptr = q; |
a8560fa0 | 181 | |
8429d022 | 182 | q->p_pptr = initproc; |
1d348849 MK |
183 | /* |
184 | * Traced processes are killed | |
185 | * since their existence means someone is screwing up. | |
1d348849 MK |
186 | */ |
187 | if (q->p_flag&STRC) { | |
188 | q->p_flag &= ~STRC; | |
189 | psignal(q, SIGKILL); | |
a8560fa0 | 190 | } |
1d348849 | 191 | } |
bdf8c113 | 192 | p->p_cptr = NULL; |
8429d022 MK |
193 | |
194 | /* | |
509987d3 | 195 | * Save exit status and final rusage info, adding in child rusage |
f3e27f1d | 196 | * info and self times. |
8429d022 MK |
197 | */ |
198 | p->p_xstat = rv; | |
199 | *p->p_ru = p->p_stats->p_ru; | |
509987d3 | 200 | calcru(p, &p->p_ru->ru_utime, &p->p_ru->ru_stime, NULL); |
8429d022 MK |
201 | ruadd(p->p_ru, &p->p_stats->p_cru); |
202 | ||
203 | /* | |
204 | * Notify parent that we're gone. | |
205 | */ | |
a8560fa0 SL |
206 | psignal(p->p_pptr, SIGCHLD); |
207 | wakeup((caddr_t)p->p_pptr); | |
fb1db32c | 208 | #if defined(tahoe) |
e149007b MK |
209 | /* move this to cpu_exit */ |
210 | p->p_addr->u_pcb.pcb_savacc.faddr = (float *)NULL; | |
fb1db32c | 211 | #endif |
de8789fe KM |
212 | /* |
213 | * Clear curproc after we've done all operations | |
214 | * that could block, and before tearing down the rest | |
215 | * of the process state that might be used from clock, etc. | |
216 | * Also, can't clear curproc while we're still runnable, | |
217 | * as we're not on a run queue (we are current, just not | |
218 | * a proper proc any longer!). | |
219 | * | |
220 | * Other substructures are freed from wait(). | |
221 | */ | |
222 | curproc = NULL; | |
223 | if (--p->p_limit->p_refcnt == 0) | |
224 | FREE(p->p_limit, M_SUBPROC); | |
225 | ||
8429d022 | 226 | /* |
e149007b MK |
227 | * Finally, call machine-dependent code to release the remaining |
228 | * resources including address space, the kernel stack and pcb. | |
229 | * The address space is released by "vmspace_free(p->p_vmspace)"; | |
230 | * This is machine-dependent, as we may have to change stacks | |
231 | * or ensure that the current one isn't reallocated before we | |
509987d3 | 232 | * finish. cpu_exit will end with a call to cpu_swtch(), finishing |
e149007b | 233 | * our execution (pun intended). |
8429d022 | 234 | */ |
e149007b | 235 | cpu_exit(p); |
8429d022 | 236 | /* NOTREACHED */ |
a8560fa0 SL |
237 | } |
238 | ||
9e97623a CT |
239 | struct wait_args { |
240 | int pid; | |
241 | int *status; | |
242 | int options; | |
243 | struct rusage *rusage; | |
244 | #ifdef COMPAT_43 | |
245 | int compat; /* pseudo */ | |
246 | #endif | |
247 | }; | |
248 | ||
1ad494e6 | 249 | #ifdef COMPAT_43 |
ef07a225 MH |
250 | #ifdef hp300 |
251 | #include <machine/frame.h> | |
252 | #define GETPS(rp) ((struct frame *)(rp))->f_sr | |
253 | #else | |
254 | #define GETPS(rp) (rp)[PS] | |
255 | #endif | |
256 | ||
1bfd8b20 KM |
257 | owait(p, uap, retval) |
258 | struct proc *p; | |
9e97623a | 259 | register struct wait_args *uap; |
1bfd8b20 KM |
260 | int *retval; |
261 | { | |
a8560fa0 | 262 | |
ba0aea50 | 263 | #ifdef PSL_ALLCC |
ef07a225 | 264 | if ((GETPS(p->p_md.md_regs) & PSL_ALLCC) != PSL_ALLCC) { |
c35e8b3f | 265 | uap->options = 0; |
9e97623a | 266 | uap->rusage = NULL; |
1ad494e6 | 267 | } else { |
5d398c16 KM |
268 | uap->options = p->p_md.md_regs[R0]; |
269 | uap->rusage = (struct rusage *)p->p_md.md_regs[R1]; | |
a8560fa0 | 270 | } |
ba0aea50 RC |
271 | #else |
272 | uap->options = 0; | |
9e97623a | 273 | uap->rusage = NULL; |
ba0aea50 | 274 | #endif |
1ad494e6 | 275 | uap->pid = WAIT_ANY; |
9e97623a | 276 | uap->status = NULL; |
a2528931 | 277 | uap->compat = 1; |
d9c2f47f | 278 | return (wait1(p, uap, retval)); |
1ad494e6 MK |
279 | } |
280 | ||
1bfd8b20 KM |
281 | wait4(p, uap, retval) |
282 | struct proc *p; | |
9e97623a | 283 | struct wait_args *uap; |
1bfd8b20 KM |
284 | int *retval; |
285 | { | |
a2528931 MK |
286 | |
287 | uap->compat = 0; | |
d9c2f47f | 288 | return (wait1(p, uap, retval)); |
a8560fa0 | 289 | } |
a2528931 MK |
290 | #else |
291 | #define wait1 wait4 | |
1ad494e6 | 292 | #endif |
a8560fa0 | 293 | |
a8560fa0 | 294 | /* |
8429d022 MK |
295 | * Wait: check child processes to see if any have exited, |
296 | * stopped under trace, or (optionally) stopped by a signal. | |
297 | * Pass back status and deallocate exited child's proc structure. | |
a8560fa0 | 298 | */ |
1bfd8b20 KM |
299 | wait1(q, uap, retval) |
300 | register struct proc *q; | |
9e97623a | 301 | register struct wait_args *uap; |
1bfd8b20 KM |
302 | int retval[]; |
303 | { | |
8429d022 | 304 | register int nfound; |
efe68e1f | 305 | register struct proc *p, *t; |
a2528931 | 306 | int status, error; |
a8560fa0 | 307 | |
1ad494e6 MK |
308 | if (uap->pid == 0) |
309 | uap->pid = -q->p_pgid; | |
c35e8b3f | 310 | #ifdef notyet |
a2528931 | 311 | if (uap->options &~ (WUNTRACED|WNOHANG)) |
d9c2f47f | 312 | return (EINVAL); |
c35e8b3f | 313 | #endif |
1ad494e6 | 314 | loop: |
8429d022 | 315 | nfound = 0; |
1d348849 | 316 | for (p = q->p_cptr; p; p = p->p_osptr) { |
1ad494e6 MK |
317 | if (uap->pid != WAIT_ANY && |
318 | p->p_pid != uap->pid && p->p_pgid != -uap->pid) | |
319 | continue; | |
8429d022 | 320 | nfound++; |
a8560fa0 | 321 | if (p->p_stat == SZOMB) { |
1bfd8b20 | 322 | retval[0] = p->p_pid; |
1ad494e6 | 323 | #ifdef COMPAT_43 |
a2528931 | 324 | if (uap->compat) |
1bfd8b20 | 325 | retval[1] = p->p_xstat; |
1ad494e6 MK |
326 | else |
327 | #endif | |
328 | if (uap->status) { | |
a2528931 MK |
329 | status = p->p_xstat; /* convert to int */ |
330 | if (error = copyout((caddr_t)&status, | |
1ad494e6 | 331 | (caddr_t)uap->status, sizeof(status))) |
d9c2f47f | 332 | return (error); |
5e63dd78 | 333 | } |
a2528931 MK |
334 | if (uap->rusage && (error = copyout((caddr_t)p->p_ru, |
335 | (caddr_t)uap->rusage, sizeof (struct rusage)))) | |
d9c2f47f | 336 | return (error); |
efe68e1f KM |
337 | /* |
338 | * If we got the child via a ptrace 'attach', | |
339 | * we need to give it back to the old parent. | |
340 | */ | |
341 | if (p->p_oppid && (t = pfind(p->p_oppid))) { | |
342 | p->p_oppid = 0; | |
343 | proc_reparent(p, t); | |
344 | psignal(t, SIGCHLD); | |
345 | wakeup((caddr_t)t); | |
346 | return (0); | |
347 | } | |
1ad494e6 | 348 | p->p_xstat = 0; |
8429d022 | 349 | ruadd(&q->p_stats->p_cru, p->p_ru); |
1ad494e6 | 350 | FREE(p->p_ru, M_ZOMBIE); |
db8fc89d KM |
351 | |
352 | /* | |
353 | * Decrement the count of procs running with this uid. | |
354 | */ | |
355 | (void)chgproccnt(p->p_cred->p_ruid, -1); | |
356 | ||
357 | /* | |
358 | * Free up credentials. | |
359 | */ | |
fe3cec6e MK |
360 | if (--p->p_cred->p_refcnt == 0) { |
361 | crfree(p->p_cred->pc_ucred); | |
362 | FREE(p->p_cred, M_SUBPROC); | |
363 | } | |
8429d022 MK |
364 | |
365 | /* | |
366 | * Finally finished with old proc entry. | |
367 | * Unlink it from its process group and free it. | |
368 | */ | |
369 | leavepgrp(p); | |
1d348849 MK |
370 | if (*p->p_prev = p->p_nxt) /* off zombproc */ |
371 | p->p_nxt->p_prev = p->p_prev; | |
a8560fa0 SL |
372 | if (q = p->p_ysptr) |
373 | q->p_osptr = p->p_osptr; | |
374 | if (q = p->p_osptr) | |
375 | q->p_ysptr = p->p_ysptr; | |
376 | if ((q = p->p_pptr)->p_cptr == p) | |
377 | q->p_cptr = p->p_osptr; | |
4021f565 | 378 | |
fe3cec6e MK |
379 | /* |
380 | * Give machine-dependent layer a chance | |
381 | * to free anything that cpu_exit couldn't | |
382 | * release while still running in process context. | |
383 | */ | |
384 | cpu_wait(p); | |
8429d022 MK |
385 | FREE(p, M_PROC); |
386 | nprocs--; | |
d9c2f47f | 387 | return (0); |
a8560fa0 | 388 | } |
1ad494e6 MK |
389 | if (p->p_stat == SSTOP && (p->p_flag & SWTED) == 0 && |
390 | (p->p_flag & STRC || uap->options & WUNTRACED)) { | |
a8560fa0 | 391 | p->p_flag |= SWTED; |
1bfd8b20 | 392 | retval[0] = p->p_pid; |
1ad494e6 | 393 | #ifdef COMPAT_43 |
85d629e3 | 394 | if (uap->compat) { |
19dec745 | 395 | retval[1] = W_STOPCODE(p->p_xstat); |
85d629e3 KM |
396 | error = 0; |
397 | } else | |
1ad494e6 MK |
398 | #endif |
399 | if (uap->status) { | |
19dec745 | 400 | status = W_STOPCODE(p->p_xstat); |
a2528931 | 401 | error = copyout((caddr_t)&status, |
ba0aea50 | 402 | (caddr_t)uap->status, sizeof(status)); |
a2528931 MK |
403 | } else |
404 | error = 0; | |
d9c2f47f | 405 | return (error); |
a8560fa0 SL |
406 | } |
407 | } | |
8429d022 | 408 | if (nfound == 0) |
d9c2f47f | 409 | return (ECHILD); |
1ad494e6 | 410 | if (uap->options & WNOHANG) { |
1bfd8b20 | 411 | retval[0] = 0; |
d9c2f47f | 412 | return (0); |
a8560fa0 | 413 | } |
1bfd8b20 | 414 | if (error = tsleep((caddr_t)q, PWAIT | PCATCH, "wait", 0)) |
d9c2f47f | 415 | return (error); |
a8560fa0 SL |
416 | goto loop; |
417 | } | |
efe68e1f KM |
418 | |
419 | /* | |
420 | * make process 'parent' the new parent of process 'child'. | |
421 | */ | |
422 | void | |
423 | proc_reparent(child, parent) | |
424 | register struct proc *child; | |
425 | register struct proc *parent; | |
426 | { | |
427 | register struct proc *o; | |
428 | register struct proc *y; | |
429 | ||
430 | if (child->p_pptr == parent) | |
431 | return; | |
432 | ||
433 | /* fix up the child linkage for the old parent */ | |
434 | o = child->p_osptr; | |
435 | y = child->p_ysptr; | |
436 | if (y) | |
437 | y->p_osptr = o; | |
438 | if (o) | |
439 | o->p_ysptr = y; | |
440 | if (child->p_pptr->p_cptr == child) | |
441 | child->p_pptr->p_cptr = o; | |
442 | ||
443 | /* fix up child linkage for new parent */ | |
444 | o = parent->p_cptr; | |
445 | if (o) | |
446 | o->p_ysptr = child; | |
447 | child->p_osptr = o; | |
448 | child->p_ysptr = NULL; | |
449 | parent->p_cptr = child; | |
450 | child->p_pptr = parent; | |
451 | } |