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1.1 root 1: /*
2: * Copyright (c) 1982, 1986, 1989, 1991 Regents of the University of California.
3: * All rights reserved.
4: *
5: * Redistribution and use in source and binary forms, with or without
6: * modification, are permitted provided that the following conditions
7: * are met:
8: * 1. Redistributions of source code must retain the above copyright
9: * notice, this list of conditions and the following disclaimer.
10: * 2. Redistributions in binary form must reproduce the above copyright
11: * notice, this list of conditions and the following disclaimer in the
12: * documentation and/or other materials provided with the distribution.
13: * 3. All advertising materials mentioning features or use of this software
14: * must display the following acknowledgement:
15: * This product includes software developed by the University of
16: * California, Berkeley and its contributors.
17: * 4. Neither the name of the University nor the names of its contributors
18: * may be used to endorse or promote products derived from this software
19: * without specific prior written permission.
20: *
21: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31: * SUCH DAMAGE.
32: *
1.1.1.4 ! root 33: * from: @(#)kern_exit.c 7.35 (Berkeley) 6/27/91
! 34: * kern_exit.c,v 1.7 1993/07/13 22:13:20 cgd Exp
1.1 root 35: */
36:
37: #include "param.h"
38: #include "systm.h"
39: #include "ioctl.h"
40: #include "tty.h"
41: #include "time.h"
42: #include "resource.h"
43: #include "kernel.h"
44: #include "proc.h"
45: #include "buf.h"
46: #include "wait.h"
47: #include "file.h"
48: #include "vnode.h"
49: #include "syslog.h"
50: #include "malloc.h"
51: #include "resourcevar.h"
1.1.1.4 ! root 52: #ifdef ACCOUNTING
! 53: #include "acct.h"
! 54: #endif
1.1 root 55:
56: #include "machine/cpu.h"
57: #ifdef COMPAT_43
58: #include "machine/reg.h"
59: #include "machine/psl.h"
60: #endif
61:
62: #include "vm/vm.h"
63: #include "vm/vm_kern.h"
64:
1.1.1.4 ! root 65: volatile void exit __P((struct proc *p, int rv));
! 66:
1.1 root 67: /*
68: * Exit system call: pass back caller's arg
69: */
1.1.1.4 ! root 70:
! 71: struct rexit_args {
! 72: int rval;
! 73: };
! 74:
1.1 root 75: /* ARGSUSED */
1.1.1.4 ! root 76: volatile void
1.1 root 77: rexit(p, uap, retval)
78: struct proc *p;
1.1.1.4 ! root 79: struct rexit_args *uap;
1.1 root 80: int *retval;
81: {
82:
1.1.1.4 ! root 83: kexit(p, W_EXITCODE(uap->rval, 0));
1.1 root 84: /* NOTREACHED */
85: }
86:
87: /*
88: * Exit: deallocate address space and other resources,
89: * change proc state to zombie, and unlink proc from allproc
90: * and parent's lists. Save exit status and rusage for wait().
91: * Check for child processes and orphan them.
92: */
1.1.1.4 ! root 93: volatile void
! 94: kexit(p, rv)
1.1 root 95: register struct proc *p;
96: int rv;
97: {
98: register struct proc *q, *nq;
99: register struct proc **pp;
100:
101: #ifdef PGINPROF
102: vmsizmon();
103: #endif
104: MALLOC(p->p_ru, struct rusage *, sizeof(struct rusage),
105: M_ZOMBIE, M_WAITOK);
106: /*
107: * If parent is waiting for us to exit or exec,
108: * SPPWAIT is set; we will wakeup the parent below.
109: */
110: p->p_flag &= ~(STRC|SPPWAIT);
111: p->p_flag |= SWEXIT;
112: p->p_sigignore = ~0;
113: p->p_sig = 0;
1.1.1.4 ! root 114: untimeout((timeout_t)realitexpire, (caddr_t)p);
1.1 root 115:
116: /*
117: * Close open files and release open-file table.
118: * This may block!
119: */
120: fdfree(p);
121:
122: /* The next two chunks should probably be moved to vmspace_exit. */
123: #ifdef SYSVSHM
124: if (p->p_vmspace->vm_shm)
125: shmexit(p);
126: #endif
127: /*
128: * Release user portion of address space.
129: * This releases references to vnodes,
130: * which could cause I/O if the file has been unlinked.
131: * Need to do this early enough that we can still sleep.
132: * Can't free the entire vmspace as the kernel stack
133: * may be mapped within that space also.
134: */
135: if (p->p_vmspace->vm_refcnt == 1)
136: (void) vm_map_remove(&p->p_vmspace->vm_map, VM_MIN_ADDRESS,
137: VM_MAXUSER_ADDRESS);
138:
139: if (p->p_pid == 1)
140: panic("init died");
1.1.1.3 root 141:
1.1 root 142: if (SESS_LEADER(p)) {
143: register struct session *sp = p->p_session;
144:
145: if (sp->s_ttyvp) {
146: /*
147: * Controlling process.
148: * Signal foreground pgrp,
149: * drain controlling terminal
150: * and revoke access to controlling terminal.
151: */
152: if (sp->s_ttyp->t_session == sp) {
153: if (sp->s_ttyp->t_pgrp)
154: pgsignal(sp->s_ttyp->t_pgrp, SIGHUP, 1);
155: (void) ttywait(sp->s_ttyp);
156: vgoneall(sp->s_ttyvp);
157: }
158: vrele(sp->s_ttyvp);
159: sp->s_ttyvp = NULL;
160: /*
161: * s_ttyp is not zero'd; we use this to indicate
162: * that the session once had a controlling terminal.
163: * (for logging and informational purposes)
164: */
165: }
166: sp->s_leader = NULL;
167: }
168: fixjobc(p, p->p_pgrp, 0);
169: p->p_rlimit[RLIMIT_FSIZE].rlim_cur = RLIM_INFINITY;
1.1.1.4 ! root 170: #ifdef ACCOUNTING
! 171: (void) acct(p);
! 172: #endif
1.1 root 173: #ifdef KTRACE
174: /*
175: * release trace file
176: */
177: if (p->p_tracep)
178: vrele(p->p_tracep);
179: #endif
180:
1.1.1.2 root 181: /* current process does not exist, as far as other parts of the
182: * system (clock) is concerned, since parts of it might not be
183: * there anymore */
184: curproc = NULL;
185:
186: if (--p->p_limit->p_refcnt == 0) {
187: FREE(p->p_limit, M_SUBPROC);
188: p->p_limit = (struct plimit *) -1;
189: }
190:
1.1 root 191: /*
192: * Remove proc from allproc queue and pidhash chain.
193: * Place onto zombproc. Unlink from parent's child list.
194: */
195: if (*p->p_prev = p->p_nxt)
196: p->p_nxt->p_prev = p->p_prev;
197: if (p->p_nxt = zombproc)
198: p->p_nxt->p_prev = &p->p_nxt;
199: p->p_prev = &zombproc;
200: zombproc = p;
201: p->p_stat = SZOMB;
202: for (pp = &pidhash[PIDHASH(p->p_pid)]; *pp; pp = &(*pp)->p_hash)
203: if (*pp == p) {
204: *pp = p->p_hash;
205: goto done;
206: }
207: panic("exit");
208: done:
209:
210: if (p->p_cptr) /* only need this if any child is S_ZOMB */
211: wakeup((caddr_t) initproc);
212: for (q = p->p_cptr; q != NULL; q = nq) {
213: nq = q->p_osptr;
214: if (nq != NULL)
215: nq->p_ysptr = NULL;
216: if (initproc->p_cptr)
217: initproc->p_cptr->p_ysptr = q;
218: q->p_osptr = initproc->p_cptr;
219: q->p_ysptr = NULL;
220: initproc->p_cptr = q;
221:
222: q->p_pptr = initproc;
223: /*
224: * Traced processes are killed
225: * since their existence means someone is screwing up.
226: */
227: if (q->p_flag&STRC) {
228: q->p_flag &= ~STRC;
229: psignal(q, SIGKILL);
230: }
231: }
232: p->p_cptr = NULL;
233:
234: /*
235: * Save exit status and final rusage info,
236: * adding in child rusage info and self times.
237: */
238: p->p_xstat = rv;
239: *p->p_ru = p->p_stats->p_ru;
240: p->p_ru->ru_stime = p->p_stime;
241: p->p_ru->ru_utime = p->p_utime;
242: ruadd(p->p_ru, &p->p_stats->p_cru);
243:
244: /*
245: * Notify parent that we're gone.
246: */
247: psignal(p->p_pptr, SIGCHLD);
248: wakeup((caddr_t)p->p_pptr);
249: #if defined(tahoe)
250: /* move this to cpu_exit */
251: p->p_addr->u_pcb.pcb_savacc.faddr = (float *)NULL;
252: #endif
253: /*
254: * Finally, call machine-dependent code to release the remaining
255: * resources including address space, the kernel stack and pcb.
256: * The address space is released by "vmspace_free(p->p_vmspace)";
257: * This is machine-dependent, as we may have to change stacks
258: * or ensure that the current one isn't reallocated before we
259: * finish. cpu_exit will end with a call to swtch(), finishing
260: * our execution (pun intended).
261: */
262: cpu_exit(p);
263: /* NOTREACHED */
264: }
265:
266: #ifdef COMPAT_43
1.1.1.4 ! root 267: struct owait_args {
! 268: int pid;
! 269: int *status;
! 270: int options;
! 271: struct rusage *rusage;
! 272: int compat;
! 273: };
! 274:
! 275: int
1.1 root 276: owait(p, uap, retval)
277: struct proc *p;
1.1.1.4 ! root 278: register struct owait_args *uap;
1.1 root 279: int *retval;
280: {
281:
1.1.1.2 root 282: uap->options = 0;
283: uap->rusage = 0;
1.1 root 284: uap->pid = WAIT_ANY;
285: uap->status = 0;
286: uap->compat = 1;
287: return (wait1(p, uap, retval));
288: }
289:
1.1.1.4 ! root 290: struct wait4_args {
! 291: int pid;
! 292: int *status;
! 293: int options;
! 294: struct rusage *rusage;
! 295: int compat;
! 296: };
! 297:
! 298: int
1.1 root 299: wait4(p, uap, retval)
300: struct proc *p;
1.1.1.4 ! root 301: struct wait4_args *uap;
1.1 root 302: int *retval;
303: {
304:
305: uap->compat = 0;
306: return (wait1(p, uap, retval));
307: }
308: #else
309: #define wait1 wait4
310: #endif
311:
312: /*
313: * Wait: check child processes to see if any have exited,
314: * stopped under trace, or (optionally) stopped by a signal.
315: * Pass back status and deallocate exited child's proc structure.
316: */
1.1.1.4 ! root 317:
! 318: struct wait1_args {
1.1 root 319: int pid;
320: int *status;
321: int options;
322: struct rusage *rusage;
323: #ifdef COMPAT_43
324: int compat;
325: #endif
1.1.1.4 ! root 326: };
! 327:
! 328: int
! 329: wait1(q, uap, retval)
! 330: register struct proc *q;
! 331: register struct wait1_args *uap;
1.1 root 332: int retval[];
333: {
334: register int nfound;
335: register struct proc *p;
336: int status, error;
337:
338: if (uap->pid == 0)
339: uap->pid = -q->p_pgid;
340: #ifdef notyet
341: if (uap->options &~ (WUNTRACED|WNOHANG))
342: return (EINVAL);
343: #endif
344: loop:
345: nfound = 0;
346: for (p = q->p_cptr; p; p = p->p_osptr) {
347: if (uap->pid != WAIT_ANY &&
348: p->p_pid != uap->pid && p->p_pgid != -uap->pid)
349: continue;
350: nfound++;
351: if (p->p_stat == SZOMB) {
352: retval[0] = p->p_pid;
353: #ifdef COMPAT_43
354: if (uap->compat)
355: retval[1] = p->p_xstat;
356: else
357: #endif
358: if (uap->status) {
359: status = p->p_xstat; /* convert to int */
360: if (error = copyout((caddr_t)&status,
361: (caddr_t)uap->status, sizeof(status)))
362: return (error);
363: }
364: if (uap->rusage && (error = copyout((caddr_t)p->p_ru,
365: (caddr_t)uap->rusage, sizeof (struct rusage))))
366: return (error);
367: p->p_xstat = 0;
368: ruadd(&q->p_stats->p_cru, p->p_ru);
369: FREE(p->p_ru, M_ZOMBIE);
370: if (--p->p_cred->p_refcnt == 0) {
371: crfree(p->p_cred->pc_ucred);
372: FREE(p->p_cred, M_SUBPROC);
1.1.1.2 root 373: p->p_cred = (struct pcred *) -1;
1.1 root 374: }
375:
376: /*
377: * Finally finished with old proc entry.
378: * Unlink it from its process group and free it.
379: */
380: leavepgrp(p);
381: if (*p->p_prev = p->p_nxt) /* off zombproc */
382: p->p_nxt->p_prev = p->p_prev;
383: if (q = p->p_ysptr)
384: q->p_osptr = p->p_osptr;
385: if (q = p->p_osptr)
386: q->p_ysptr = p->p_ysptr;
387: if ((q = p->p_pptr)->p_cptr == p)
388: q->p_cptr = p->p_osptr;
389:
390: /*
391: * Give machine-dependent layer a chance
392: * to free anything that cpu_exit couldn't
393: * release while still running in process context.
394: */
395: cpu_wait(p);
396: FREE(p, M_PROC);
397: nprocs--;
398: return (0);
399: }
400: if (p->p_stat == SSTOP && (p->p_flag & SWTED) == 0 &&
401: (p->p_flag & STRC || uap->options & WUNTRACED)) {
402: p->p_flag |= SWTED;
403: retval[0] = p->p_pid;
404: #ifdef COMPAT_43
405: if (uap->compat) {
406: retval[1] = W_STOPCODE(p->p_xstat);
407: error = 0;
408: } else
409: #endif
410: if (uap->status) {
411: status = W_STOPCODE(p->p_xstat);
412: error = copyout((caddr_t)&status,
413: (caddr_t)uap->status, sizeof(status));
414: } else
415: error = 0;
416: return (error);
417: }
418: }
419: if (nfound == 0)
420: return (ECHILD);
421: if (uap->options & WNOHANG) {
422: retval[0] = 0;
423: return (0);
424: }
425: if (error = tsleep((caddr_t)q, PWAIT | PCATCH, "wait", 0))
426: return (error);
427: goto loop;
428: }
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