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 | * |
3ef0a118 | 12 | * @(#)kern_exit.c 8.8 (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 | */ | |
3ef0a118 KM |
168 | LIST_REMOVE(p, p_list); |
169 | LIST_INSERT_HEAD(&zombproc, p, p_list); | |
a8560fa0 | 170 | p->p_stat = SZOMB; |
de8789fe | 171 | |
3ef0a118 | 172 | LIST_REMOVE(p, p_hash); |
8429d022 | 173 | |
3ef0a118 KM |
174 | q = p->p_children.lh_first; |
175 | if (q) /* only need this if any child is S_ZOMB */ | |
8429d022 | 176 | wakeup((caddr_t) initproc); |
3ef0a118 KM |
177 | for (; q != 0; q = nq) { |
178 | nq = q->p_sibling.le_next; | |
179 | LIST_REMOVE(q, p_sibling); | |
180 | LIST_INSERT_HEAD(&initproc->p_children, q, p_sibling); | |
8429d022 | 181 | q->p_pptr = initproc; |
1d348849 MK |
182 | /* |
183 | * Traced processes are killed | |
184 | * since their existence means someone is screwing up. | |
1d348849 | 185 | */ |
cf5ef508 KB |
186 | if (q->p_flag & P_TRACED) { |
187 | q->p_flag &= ~P_TRACED; | |
1d348849 | 188 | psignal(q, SIGKILL); |
a8560fa0 | 189 | } |
1d348849 | 190 | } |
8429d022 MK |
191 | |
192 | /* | |
509987d3 | 193 | * Save exit status and final rusage info, adding in child rusage |
f3e27f1d | 194 | * info and self times. |
8429d022 MK |
195 | */ |
196 | p->p_xstat = rv; | |
197 | *p->p_ru = p->p_stats->p_ru; | |
509987d3 | 198 | calcru(p, &p->p_ru->ru_utime, &p->p_ru->ru_stime, NULL); |
8429d022 MK |
199 | ruadd(p->p_ru, &p->p_stats->p_cru); |
200 | ||
201 | /* | |
202 | * Notify parent that we're gone. | |
203 | */ | |
a8560fa0 SL |
204 | psignal(p->p_pptr, SIGCHLD); |
205 | wakeup((caddr_t)p->p_pptr); | |
fb1db32c | 206 | #if defined(tahoe) |
e149007b MK |
207 | /* move this to cpu_exit */ |
208 | p->p_addr->u_pcb.pcb_savacc.faddr = (float *)NULL; | |
fb1db32c | 209 | #endif |
de8789fe KM |
210 | /* |
211 | * Clear curproc after we've done all operations | |
212 | * that could block, and before tearing down the rest | |
213 | * of the process state that might be used from clock, etc. | |
214 | * Also, can't clear curproc while we're still runnable, | |
215 | * as we're not on a run queue (we are current, just not | |
216 | * a proper proc any longer!). | |
217 | * | |
218 | * Other substructures are freed from wait(). | |
219 | */ | |
220 | curproc = NULL; | |
221 | if (--p->p_limit->p_refcnt == 0) | |
222 | FREE(p->p_limit, M_SUBPROC); | |
223 | ||
8429d022 | 224 | /* |
e149007b MK |
225 | * Finally, call machine-dependent code to release the remaining |
226 | * resources including address space, the kernel stack and pcb. | |
227 | * The address space is released by "vmspace_free(p->p_vmspace)"; | |
228 | * This is machine-dependent, as we may have to change stacks | |
229 | * or ensure that the current one isn't reallocated before we | |
509987d3 | 230 | * finish. cpu_exit will end with a call to cpu_swtch(), finishing |
e149007b | 231 | * our execution (pun intended). |
8429d022 | 232 | */ |
e149007b | 233 | cpu_exit(p); |
a8560fa0 SL |
234 | } |
235 | ||
9e97623a CT |
236 | struct wait_args { |
237 | int pid; | |
238 | int *status; | |
239 | int options; | |
240 | struct rusage *rusage; | |
241 | #ifdef COMPAT_43 | |
242 | int compat; /* pseudo */ | |
243 | #endif | |
244 | }; | |
245 | ||
1ad494e6 | 246 | #ifdef COMPAT_43 |
2a81c17c | 247 | #if defined(hp300) || defined(luna68k) |
ef07a225 MH |
248 | #include <machine/frame.h> |
249 | #define GETPS(rp) ((struct frame *)(rp))->f_sr | |
250 | #else | |
251 | #define GETPS(rp) (rp)[PS] | |
252 | #endif | |
253 | ||
1bfd8b20 KM |
254 | owait(p, uap, retval) |
255 | struct proc *p; | |
9e97623a | 256 | register struct wait_args *uap; |
1bfd8b20 KM |
257 | int *retval; |
258 | { | |
a8560fa0 | 259 | |
ba0aea50 | 260 | #ifdef PSL_ALLCC |
ef07a225 | 261 | if ((GETPS(p->p_md.md_regs) & PSL_ALLCC) != PSL_ALLCC) { |
c35e8b3f | 262 | uap->options = 0; |
9e97623a | 263 | uap->rusage = NULL; |
1ad494e6 | 264 | } else { |
5d398c16 KM |
265 | uap->options = p->p_md.md_regs[R0]; |
266 | uap->rusage = (struct rusage *)p->p_md.md_regs[R1]; | |
a8560fa0 | 267 | } |
ba0aea50 RC |
268 | #else |
269 | uap->options = 0; | |
9e97623a | 270 | uap->rusage = NULL; |
ba0aea50 | 271 | #endif |
1ad494e6 | 272 | uap->pid = WAIT_ANY; |
9e97623a | 273 | uap->status = NULL; |
a2528931 | 274 | uap->compat = 1; |
d9c2f47f | 275 | return (wait1(p, uap, retval)); |
1ad494e6 MK |
276 | } |
277 | ||
1bfd8b20 KM |
278 | wait4(p, uap, retval) |
279 | struct proc *p; | |
9e97623a | 280 | struct wait_args *uap; |
1bfd8b20 KM |
281 | int *retval; |
282 | { | |
a2528931 MK |
283 | |
284 | uap->compat = 0; | |
d9c2f47f | 285 | return (wait1(p, uap, retval)); |
a8560fa0 | 286 | } |
a2528931 MK |
287 | #else |
288 | #define wait1 wait4 | |
1ad494e6 | 289 | #endif |
a8560fa0 | 290 | |
cb84e0ab | 291 | int |
1bfd8b20 KM |
292 | wait1(q, uap, retval) |
293 | register struct proc *q; | |
9e97623a | 294 | register struct wait_args *uap; |
1bfd8b20 KM |
295 | int retval[]; |
296 | { | |
8429d022 | 297 | register int nfound; |
efe68e1f | 298 | register struct proc *p, *t; |
a2528931 | 299 | int status, error; |
a8560fa0 | 300 | |
1ad494e6 MK |
301 | if (uap->pid == 0) |
302 | uap->pid = -q->p_pgid; | |
c35e8b3f | 303 | #ifdef notyet |
a2528931 | 304 | if (uap->options &~ (WUNTRACED|WNOHANG)) |
d9c2f47f | 305 | return (EINVAL); |
c35e8b3f | 306 | #endif |
1ad494e6 | 307 | loop: |
8429d022 | 308 | nfound = 0; |
3ef0a118 | 309 | for (p = q->p_children.lh_first; p != 0; p = p->p_sibling.le_next) { |
1ad494e6 MK |
310 | if (uap->pid != WAIT_ANY && |
311 | p->p_pid != uap->pid && p->p_pgid != -uap->pid) | |
312 | continue; | |
8429d022 | 313 | nfound++; |
a8560fa0 | 314 | if (p->p_stat == SZOMB) { |
1bfd8b20 | 315 | retval[0] = p->p_pid; |
1ad494e6 | 316 | #ifdef COMPAT_43 |
a2528931 | 317 | if (uap->compat) |
1bfd8b20 | 318 | retval[1] = p->p_xstat; |
1ad494e6 MK |
319 | else |
320 | #endif | |
321 | if (uap->status) { | |
a2528931 MK |
322 | status = p->p_xstat; /* convert to int */ |
323 | if (error = copyout((caddr_t)&status, | |
1ad494e6 | 324 | (caddr_t)uap->status, sizeof(status))) |
d9c2f47f | 325 | return (error); |
5e63dd78 | 326 | } |
a2528931 MK |
327 | if (uap->rusage && (error = copyout((caddr_t)p->p_ru, |
328 | (caddr_t)uap->rusage, sizeof (struct rusage)))) | |
d9c2f47f | 329 | return (error); |
efe68e1f KM |
330 | /* |
331 | * If we got the child via a ptrace 'attach', | |
332 | * we need to give it back to the old parent. | |
333 | */ | |
334 | if (p->p_oppid && (t = pfind(p->p_oppid))) { | |
335 | p->p_oppid = 0; | |
336 | proc_reparent(p, t); | |
337 | psignal(t, SIGCHLD); | |
338 | wakeup((caddr_t)t); | |
339 | return (0); | |
340 | } | |
1ad494e6 | 341 | p->p_xstat = 0; |
8429d022 | 342 | ruadd(&q->p_stats->p_cru, p->p_ru); |
1ad494e6 | 343 | FREE(p->p_ru, M_ZOMBIE); |
db8fc89d KM |
344 | |
345 | /* | |
346 | * Decrement the count of procs running with this uid. | |
347 | */ | |
348 | (void)chgproccnt(p->p_cred->p_ruid, -1); | |
349 | ||
350 | /* | |
351 | * Free up credentials. | |
352 | */ | |
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 | 357 | |
859437ef JSP |
358 | /* |
359 | * Release reference to text vnode | |
360 | */ | |
361 | if (p->p_textvp) | |
362 | vrele(p->p_textvp); | |
363 | ||
8429d022 MK |
364 | /* |
365 | * Finally finished with old proc entry. | |
366 | * Unlink it from its process group and free it. | |
367 | */ | |
368 | leavepgrp(p); | |
3ef0a118 KM |
369 | LIST_REMOVE(p, p_list); /* off zombproc */ |
370 | LIST_REMOVE(p, p_sibling); | |
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 | } |
cf5ef508 KB |
382 | if (p->p_stat == SSTOP && (p->p_flag & P_WAITED) == 0 && |
383 | (p->p_flag & P_TRACED || uap->options & WUNTRACED)) { | |
384 | p->p_flag |= P_WAITED; | |
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 | { | |
efe68e1f KM |
420 | |
421 | if (child->p_pptr == parent) | |
422 | return; | |
423 | ||
3ef0a118 KM |
424 | LIST_REMOVE(child, p_sibling); |
425 | LIST_INSERT_HEAD(&parent->p_children, child, p_sibling); | |
efe68e1f KM |
426 | child->p_pptr = parent; |
427 | } |