bsd/kern/kern_exit.c

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22 /* Copyright (c) 1995, 1997 Apple Computer, Inc. All Rights Reserved */
  23 /*
  24  * Copyright (c) 1982, 1986, 1989, 1991, 1993
  25  *      The Regents of the University of California.  All rights reserved.
  26  * (c) UNIX System Laboratories, Inc.
  27  * All or some portions of this file are derived from material licensed
  28  * to the University of California by American Telephone and Telegraph
  29  * Co. or Unix System Laboratories, Inc. and are reproduced herein with
  30  * the permission of UNIX System Laboratories, Inc.
  31  *
  32  * Redistribution and use in source and binary forms, with or without
  33  * modification, are permitted provided that the following conditions
  34  * are met:
  35  * 1. Redistributions of source code must retain the above copyright
  36  *    notice, this list of conditions and the following disclaimer.
  37  * 2. Redistributions in binary form must reproduce the above copyright
  38  *    notice, this list of conditions and the following disclaimer in the
  39  *    documentation and/or other materials provided with the distribution.
  40  * 3. All advertising materials mentioning features or use of this software
  41  *    must display the following acknowledgement:
  42  *      This product includes software developed by the University of
  43  *      California, Berkeley and its contributors.
  44  * 4. Neither the name of the University nor the names of its contributors
  45  *    may be used to endorse or promote products derived from this software
  46  *    without specific prior written permission.
  47  *
  48  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  49  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  50  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  51  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  52  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  53  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  54  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  55  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  56  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  57  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  58  * SUCH DAMAGE.
  59  *
  60  *      @(#)kern_exit.c 8.7 (Berkeley) 2/12/94
  61  */
  62
  63 #include <machine/reg.h>
  64 #include <machine/psl.h>
  65
  66 #include "compat_43.h"
  67
  68 #include <sys/param.h>
  69 #include <sys/systm.h>
  70 #include <sys/ioctl.h>
  71 #include <sys/proc.h>
  72 #include <sys/tty.h>
  73 #include <sys/time.h>
  74 #include <sys/resource.h>
  75 #include <sys/kernel.h>
  76 #include <sys/buf.h>
  77 #include <sys/wait.h>
  78 #include <sys/file.h>
  79 #include <sys/vnode.h>
  80 #include <sys/syslog.h>
  81 #include <sys/malloc.h>
  82 #include <sys/resourcevar.h>
  83 #include <sys/ptrace.h>
  84 #include <sys/user.h>
  85
  86 #include <mach/mach_types.h>
  87 #include <kern/thread.h>
  88 #include <kern/thread_act.h>
  89 #include <kern/assert.h>
  90
  91 extern char init_task_failure_data[];
  92 int exit1 __P((struct proc *, int, int *));
  93
  94 /*
  95  * exit --
  96  *      Death of process.
  97  */
  98 struct exit_args {
  99         int     rval;
 100 };
 101 void
 102 exit(p, uap, retval)
 103         struct proc *p;
 104         struct exit_args *uap;
 105         int *retval;
 106 {
 107         exit1(p, W_EXITCODE(uap->rval, 0), retval);
 108
 109         /* drop funnel befewo we return */
 110         thread_funnel_set(kernel_flock, FALSE);
 111         thread_exception_return();
 112         /* NOTREACHED */
 113         while (TRUE)
 114                 thread_block(0);
 115         /* NOTREACHED */
 116 }
 117
 118 /*
 119  * Exit: deallocate address space and other resources, change proc state
 120  * to zombie, and unlink proc from allproc and parent's lists.  Save exit
 121  * status and rusage for wait().  Check for child processes and orphan them.
 122  */
 123 int
 124 exit1(p, rv, retval)
 125         register struct proc *p;
 126         int rv;
 127         int * retval;
 128 {
 129         register struct proc *q, *nq;
 130         thread_t self = current_thread();
 131         thread_act_t th_act_self = current_act();
 132         struct task *task = p->task;
 133         register int i,s;
 134         struct uthread *ut;
 135
 136         /*
 137          * If a thread in this task has already
 138          * called exit(), then halt any others
 139          * right here.
 140          */
 141
 142          ut = get_bsdthread_info(th_act_self);
 143          if (ut->uu_flag & P_VFORK) {
 144                         vfork_exit(p, rv);
 145                         vfork_return(th_act_self, p->p_pptr, p , retval);
 146                         unix_syscall_return(0);
 147                         /* NOT REACHED */
 148          }
 149         signal_lock(p);
 150         while (p->exit_thread != self) {
 151                 if (sig_try_locked(p) <= 0) {
 152                         if (get_threadtask(th_act_self) != task) {
 153                                 signal_unlock(p);
 154                                 return(0);
 155                         }
 156                         signal_unlock(p);
 157                         thread_terminate(th_act_self);
 158                         thread_funnel_set(kernel_flock, FALSE);
 159                         thread_exception_return();
 160                         /* NOTREACHED */
 161                 }
 162                 sig_lock_to_exit(p);
 163         }
 164         signal_unlock(p);
 165         if (p->p_pid == 1) {
 166                 printf("pid 1 exited (signal %d, exit %d)",
 167                     WTERMSIG(rv), WEXITSTATUS(rv));
 168                 panic("init died\nState at Last Exception:\n\n%s",
 169                                                         init_task_failure_data);
 170         }
 171
 172         s = splsched();
 173         p->p_flag |= P_WEXIT;
 174         splx(s);
 175         proc_prepareexit(p);
 176         p->p_xstat = rv;
 177
 178         /* task terminate will call proc_terminate and that cleans it up */
 179         task_terminate_internal(task);
 180
 181         /*
 182          * we come back and returns to AST which
 183          * should cleanup the rest
 184          */
 185 #if 0
 186         if (task == current_task()) {
 187                 thread_exception_return();
 188                 /*NOTREACHED*/
 189         }
 190
 191         while (task == current_task()) {
 192                 thread_terminate_self();
 193                 /*NOTREACHED*/
 194         }
 195 #endif
 196         return(0);
 197 }
 198
 199 void
 200 proc_prepareexit(struct proc *p)
 201 {
 202         int s;
 203         struct uthread *ut;
 204         thread_t self = current_thread();
 205         thread_act_t th_act_self = current_act();
 206
 207         /*
 208          * Remove proc from allproc queue and from pidhash chain.
 209          * Need to do this before we do anything that can block.
 210          * Not doing causes things like mount() find this on allproc
 211          * in partially cleaned state.
 212          */
 213         LIST_REMOVE(p, p_list);
 214         LIST_REMOVE(p, p_hash);
 215
 216 #ifdef PGINPROF
 217         vmsizmon();
 218 #endif
 219         /*
 220          * If parent is waiting for us to exit or exec,
 221          * P_PPWAIT is set; we will wakeup the parent below.
 222          */
 223         p->p_flag &= ~(P_TRACED | P_PPWAIT);
 224         p->p_sigignore = ~0;
 225         p->p_siglist = 0;
 226         ut = get_bsdthread_info(th_act_self);
 227         ut->uu_sig = 0;
 228         untimeout(realitexpire, (caddr_t)p);
 229 }
 230
 231 void
 232 proc_exit(struct proc *p)
 233 {
 234         register struct proc *q, *nq;
 235         thread_t self = current_thread();
 236         thread_act_t th_act_self = current_act();
 237         struct task *task = p->task;
 238         register int i,s;
 239         boolean_t funnel_state;
 240
 241         /* This can happen if thread_terminate of the single thread
 242          * process
 243          */
 244
 245         funnel_state = thread_funnel_set(kernel_flock, TRUE);
 246         if( !(p->p_flag & P_WEXIT)) {
 247                 s = splsched();
 248                 p->p_flag |= P_WEXIT;
 249                 splx(s);
 250                 proc_prepareexit(p);
 251         }
 252
 253         MALLOC_ZONE(p->p_ru, struct rusage *,
 254                         sizeof (*p->p_ru), M_ZOMBIE, M_WAITOK);
 255
 256         /*
 257          * Close open files and release open-file table.
 258          * This may block!
 259          */
 260         fdfree(p);
 261
 262         /* Close ref SYSV Shared memory*/
 263         if (p->vm_shm)
 264                 shmexit(p);
 265
 266         if (SESS_LEADER(p)) {
 267                 register struct session *sp = p->p_session;
 268
 269                 if (sp->s_ttyvp) {
 270                         /*
 271                          * Controlling process.
 272                          * Signal foreground pgrp,
 273                          * drain controlling terminal
 274                          * and revoke access to controlling terminal.
 275                          */
 276                         if (sp->s_ttyp->t_session == sp) {
 277                                 if (sp->s_ttyp->t_pgrp)
 278                                         pgsignal(sp->s_ttyp->t_pgrp, SIGHUP, 1);
 279                                 (void) ttywait(sp->s_ttyp);
 280                                 /*
 281                                  * The tty could have been revoked
 282                                  * if we blocked.
 283                                  */
 284                                 if (sp->s_ttyvp)
 285                                         VOP_REVOKE(sp->s_ttyvp, REVOKEALL);
 286                         }
 287                         if (sp->s_ttyvp)
 288                                 vrele(sp->s_ttyvp);
 289                         sp->s_ttyvp = NULL;
 290                         /*
 291                          * s_ttyp is not zero'd; we use this to indicate
 292                          * that the session once had a controlling terminal.
 293                          * (for logging and informational purposes)
 294                          */
 295                 }
 296                 sp->s_leader = NULL;
 297         }
 298
 299         fixjobc(p, p->p_pgrp, 0);
 300         p->p_rlimit[RLIMIT_FSIZE].rlim_cur = RLIM_INFINITY;
 301 #if KTRACE
 302         /*
 303          * release trace file
 304          */
 305         p->p_traceflag = 0;     /* don't trace the vrele() */
 306         if (p->p_tracep)
 307                 vrele(p->p_tracep);
 308 #endif
 309
 310
 311         q = p->p_children.lh_first;
 312         if (q)          /* only need this if any child is S_ZOMB */
 313                 wakeup((caddr_t) initproc);
 314         for (; q != 0; q = nq) {
 315                 nq = q->p_sibling.le_next;
 316                 proc_reparent(q, initproc);
 317                 /*
 318                  * Traced processes are killed
 319                  * since their existence means someone is messing up.
 320                  */
 321                 if (q->p_flag & P_TRACED) {
 322                         q->p_flag &= ~P_TRACED;
 323                         if (q->sigwait_thread) {
 324                                 thread_t sig_shuttle  = getshuttle_thread(q->sigwait_thread);
 325                                 /*
 326                                  * The sigwait_thread could be stopped at a
 327                                  * breakpoint. Wake it up to kill.
 328                                  * Need to do this as it could be a thread which is not
 329                                  * the first thread in the task. So any attempts to kill
 330                                  * the process would result into a deadlock on q->sigwait.
 331                                  */
 332                                 thread_resume((struct thread *)q->sigwait_thread);
 333                                 clear_wait(sig_shuttle, THREAD_INTERRUPTED);
 334                                 threadsignal(q->sigwait_thread, SIGKILL, 0);
 335                         }
 336                         psignal(q, SIGKILL);
 337                 }
 338         }
 339
 340         /*
 341          * Save exit status and final rusage info, adding in child rusage
 342          * info and self times.
 343          */
 344         *p->p_ru = p->p_stats->p_ru;
 345
 346         timerclear(&p->p_ru->ru_utime);
 347         timerclear(&p->p_ru->ru_stime);
 348
 349         if (task) {
 350                 task_basic_info_data_t tinfo;
 351                 task_thread_times_info_data_t ttimesinfo;
 352                 int task_info_stuff, task_ttimes_stuff;
 353                 struct timeval ut,st;
 354
 355                 task_info_stuff = TASK_BASIC_INFO_COUNT;
 356                 task_info(task, TASK_BASIC_INFO,
 357                           &tinfo, &task_info_stuff);
 358                 p->p_ru->ru_utime.tv_sec = tinfo.user_time.seconds;
 359                 p->p_ru->ru_utime.tv_usec = tinfo.user_time.microseconds;
 360                 p->p_ru->ru_stime.tv_sec = tinfo.system_time.seconds;
 361                 p->p_ru->ru_stime.tv_usec = tinfo.system_time.microseconds;
 362
 363                 task_ttimes_stuff = TASK_THREAD_TIMES_INFO_COUNT;
 364                 task_info(task, TASK_THREAD_TIMES_INFO,
 365                           &ttimesinfo, &task_ttimes_stuff);
 366
 367                 ut.tv_sec = ttimesinfo.user_time.seconds;
 368                 ut.tv_usec = ttimesinfo.user_time.microseconds;
 369                 st.tv_sec = ttimesinfo.system_time.seconds;
 370                 st.tv_usec = ttimesinfo.system_time.microseconds;
 371                 timeradd(&ut,&p->p_ru->ru_utime,&p->p_ru->ru_utime);
 372                 timeradd(&st,&p->p_ru->ru_stime,&p->p_ru->ru_stime);
 373         }
 374
 375         ruadd(p->p_ru, &p->p_stats->p_cru);
 376
 377         /*
 378          * Free up profiling buffers.
 379          */
 380         {
 381                 struct uprof *p0 = &p->p_stats->p_prof, *p1, *pn;
 382
 383                 p1 = p0->pr_next;
 384                 p0->pr_next = NULL;
 385                 p0->pr_scale = 0;
 386
 387                 for (; p1 != NULL; p1 = pn) {
 388                         pn = p1->pr_next;
 389                         kfree((vm_offset_t)p1, sizeof *p1);
 390                 }
 391         }
 392
 393         /*
 394          * Other substructures are freed from wait().
 395          */
 396         FREE_ZONE(p->p_stats, sizeof *p->p_stats, M_SUBPROC);
 397         p->p_stats = NULL;
 398
 399         FREE_ZONE(p->p_sigacts, sizeof *p->p_sigacts, M_SUBPROC);
 400         p->p_sigacts = NULL;
 401
 402         if (--p->p_limit->p_refcnt == 0)
 403                 FREE_ZONE(p->p_limit, sizeof *p->p_limit, M_SUBPROC);
 404         p->p_limit = NULL;
 405
 406         /*
 407          * Finish up by terminating the task
 408          * and halt this thread (only if a
 409          * member of the task exiting).
 410          */
 411         p->task = TASK_NULL;
 412         //task->proc = NULL;
 413         set_bsdtask_info(task, NULL);
 414
 415         /*
 416          * Notify parent that we're gone.
 417          */
 418         psignal(p->p_pptr, SIGCHLD);
 419
 420         /* Place onto zombproc. */
 421         LIST_INSERT_HEAD(&zombproc, p, p_list);
 422         p->p_stat = SZOMB;
 423
 424         /* and now wakeup the parent */
 425         wakeup((caddr_t)p->p_pptr);
 426
 427         (void) thread_funnel_set(kernel_flock, funnel_state);
 428 }
 429
 430
 431 struct wait4_args {
 432         int     pid;
 433         int *status;
 434         int options;
 435         struct rusage *rusage;
 436 };
 437
 438 #if COMPAT_43
 439 int
 440 owait(p, uap, retval)
 441         struct proc *p;
 442         void *uap;
 443         int *retval;
 444 {
 445         struct wait4_args *a;
 446
 447         a = (struct wait4_args *)get_bsduthreadarg(current_act());
 448
 449         a->options = 0;
 450         a->rusage = NULL;
 451         a->pid = WAIT_ANY;
 452         a->status = NULL;
 453         return (wait1(p, a, retval, 1));
 454 }
 455
 456 int
 457 wait4(p, uap, retval)
 458         struct proc *p;
 459         struct wait4_args *uap;
 460         int *retval;
 461 {
 462         return (wait1(p, uap, retval, 0));
 463 }
 464
 465 struct owait3_args {
 466         int *status;
 467         int options;
 468         struct rusage *rusage;
 469 };
 470
 471 int
 472 owait3(p, uap, retval)
 473         struct proc *p;
 474         struct owait3_args *uap;
 475         int *retval;
 476 {
 477         struct wait4_args *a;
 478
 479         a = (struct wait4_args *)get_bsduthreadarg(current_act);
 480
 481         a->rusage = uap->rusage;
 482         a->options = uap->options;
 483         a->status = uap->status;
 484         a->pid = WAIT_ANY;
 485
 486         return (wait1(p, a, retval, 1));
 487 }
 488
 489 #else
 490 #define wait1   wait4
 491 #endif
 492
 493 int
 494 wait1continue(result)
 495 {
 496         void *vt;
 497         thread_act_t thread;
 498         int *retval;
 499         struct proc *p;
 500
 501         if (result)
 502                 return(result);
 503
 504         p = current_proc();
 505         thread = current_act();
 506         vt = get_bsduthreadarg(thread);
 507         retval = get_bsduthreadrval(thread);
 508         wait1((struct proc *)p, (struct wait4_args *)vt, retval, 0);
 509 }
 510
 511 int
 512 wait1(q, uap, retval, compat)
 513         register struct proc *q;
 514         register struct wait4_args *uap;
 515         register_t *retval;
 516 #if COMPAT_43
 517         int compat;
 518 #endif
 519 {
 520         register int nfound;
 521         register struct proc *p, *t;
 522         int status, error;
 523
 524 retry:
 525         if (uap->pid == 0)
 526                 uap->pid = -q->p_pgid;
 527
 528 loop:
 529         nfound = 0;
 530         for (p = q->p_children.lh_first; p != 0; p = p->p_sibling.le_next) {
 531                 if (uap->pid != WAIT_ANY &&
 532                     p->p_pid != uap->pid &&
 533                     p->p_pgid != -(uap->pid))
 534                         continue;
 535                 nfound++;
 536                 if (p->p_flag & P_WAITING) {
 537                         (void)tsleep(&p->p_stat, PWAIT, "waitcoll", 0);
 538                         goto loop;
 539                 }
 540                 p->p_flag |= P_WAITING;   /* only allow single thread to wait() */
 541
 542                 if (p->p_stat == SZOMB) {
 543                         retval[0] = p->p_pid;
 544 #if COMPAT_43
 545                         if (compat)
 546                                 retval[1] = p->p_xstat;
 547                         else
 548 #endif
 549                         if (uap->status) {
 550                                 status = p->p_xstat;    /* convert to int */
 551                                 if (error = copyout((caddr_t)&status,
 552                                     (caddr_t)uap->status,
 553                                                     sizeof(status))) {
 554                                         p->p_flag &= ~P_WAITING;
 555                                         wakeup(&p->p_stat);
 556                                         return (error);
 557                                 }
 558                         }
 559                         if (uap->rusage &&
 560                             (error = copyout((caddr_t)p->p_ru,
 561                             (caddr_t)uap->rusage,
 562                                              sizeof (struct rusage)))) {
 563                                 p->p_flag &= ~P_WAITING;
 564                                 wakeup(&p->p_stat);
 565                                 return (error);
 566                         }
 567                         /*
 568                          * If we got the child via a ptrace 'attach',
 569                          * we need to give it back to the old parent.
 570                          */
 571                         if (p->p_oppid && (t = pfind(p->p_oppid))) {
 572                                 p->p_oppid = 0;
 573                                 proc_reparent(p, t);
 574                                 psignal(t, SIGCHLD);
 575                                 wakeup((caddr_t)t);
 576                                 p->p_flag &= ~P_WAITING;
 577                                 wakeup(&p->p_stat);
 578                                 return (0);
 579                         }
 580                         p->p_xstat = 0;
 581                         if (p->p_ru) {
 582                                 ruadd(&q->p_stats->p_cru, p->p_ru);
 583                                 FREE_ZONE(p->p_ru, sizeof *p->p_ru, M_ZOMBIE);
 584                                 p->p_ru = NULL;
 585                         } else {
 586                                 printf("Warning : lost p_ru for %s\n", p->p_comm);
 587                         }
 588
 589                         /*
 590                          * Decrement the count of procs running with this uid.
 591                          */
 592                         (void)chgproccnt(p->p_cred->p_ruid, -1);
 593
 594                         /*
 595                          * Free up credentials.
 596                          */
 597                         if (--p->p_cred->p_refcnt == 0) {
 598                                 struct ucred *ucr = p->p_ucred;
 599                                 struct pcred *pcr;
 600
 601                                 if (ucr != NOCRED) {
 602                                         p->p_ucred = NOCRED;
 603                                         crfree(ucr);
 604                                 }
 605                                 pcr = p->p_cred;
 606                                 p->p_cred = NULL;
 607                                 FREE_ZONE(pcr, sizeof *pcr, M_SUBPROC);
 608                         }
 609
 610                         /*
 611                          * Release reference to text vnode
 612                          */
 613                         if (p->p_textvp)
 614                                 vrele(p->p_textvp);
 615
 616                         /*
 617                          * Finally finished with old proc entry.
 618                          * Unlink it from its process group and free it.
 619                          */
 620                         leavepgrp(p);
 621                         LIST_REMOVE(p, p_list); /* off zombproc */
 622                         LIST_REMOVE(p, p_sibling);
 623                         p->p_flag &= ~P_WAITING;
 624                         FREE_ZONE(p, sizeof *p, M_PROC);
 625                         nprocs--;
 626                         wakeup(&p->p_stat);
 627                         return (0);
 628                 }
 629                 if (p->p_stat == SSTOP && (p->p_flag & P_WAITED) == 0 &&
 630                     (p->p_flag & P_TRACED || uap->options & WUNTRACED)) {
 631                         p->p_flag |= P_WAITED;
 632                         retval[0] = p->p_pid;
 633 #if COMPAT_43
 634                         if (compat) {
 635                                 retval[1] = W_STOPCODE(p->p_xstat);
 636                                 error = 0;
 637                         } else
 638 #endif
 639                         if (uap->status) {
 640                                 status = W_STOPCODE(p->p_xstat);
 641                                 error = copyout((caddr_t)&status,
 642                                     (caddr_t)uap->status,
 643                                     sizeof(status));
 644                         } else
 645                                 error = 0;
 646                         p->p_flag &= ~P_WAITING;
 647                         wakeup(&p->p_stat);
 648                         return (error);
 649                 }
 650                 p->p_flag &= ~P_WAITING;
 651                 wakeup(&p->p_stat);
 652         }
 653         if (nfound == 0)
 654                 return (ECHILD);
 655
 656         if (uap->options & WNOHANG) {
 657                 retval[0] = 0;
 658                 return (0);
 659         }
 660
 661         if (error = tsleep0((caddr_t)q, PWAIT | PCATCH, "wait", 0, wait1continue))
 662                 return (error);
 663
 664         goto loop;
 665 }
 666
 667 /*
 668  * make process 'parent' the new parent of process 'child'.
 669  */
 670 void
 671 proc_reparent(child, parent)
 672         register struct proc *child;
 673         register struct proc *parent;
 674 {
 675
 676         if (child->p_pptr == parent)
 677                 return;
 678
 679         LIST_REMOVE(child, p_sibling);
 680         LIST_INSERT_HEAD(&parent->p_children, child, p_sibling);
 681         child->p_pptr = parent;
 682 }
 683
 684 /*
 685  *      Make the current process an "init" process, meaning
 686  *      that it doesn't have a parent, and that it won't be
 687  *      gunned down by kill(-1, 0).
 688  */
 689 kern_return_t
 690 init_process(void)
 691 {
 692         register struct proc *p = current_proc();
 693
 694         if (suser(p->p_ucred, &p->p_acflag))
 695                 return(KERN_NO_ACCESS);
 696
 697         if (p->p_pid != 1 && p->p_pgid != p->p_pid)
 698                 enterpgrp(p, p->p_pid, 0);
 699         p->p_flag |= P_SYSTEM;
 700
 701         /*
 702          *      Take us out of the sibling chain, and
 703          *      out of our parent's child chain.
 704          */
 705         LIST_REMOVE(p, p_sibling);
 706         p->p_sibling.le_prev = NULL;
 707         p->p_sibling.le_next = NULL;
 708         p->p_pptr = kernproc;
 709
 710         return(KERN_SUCCESS);
 711 }
 712
 713 void
 714 process_terminate_self(void)
 715 {
 716         struct proc *p = current_proc();
 717
 718         if (p != NULL) {
 719                 exit1(p, W_EXITCODE(0, SIGKILL), (int *)NULL);
 720                 /*NOTREACHED*/
 721         }
 722 }
 723
 724 /*
 725  * Exit: deallocate address space and other resources, change proc state
 726  * to zombie, and unlink proc from allproc and parent's lists.  Save exit
 727  * status and rusage for wait().  Check for child processes and orphan them.
 728  */
 729
 730 void
 731 vfork_exit(p, rv)
 732         register struct proc *p;
 733         int rv;
 734 {
 735         register struct proc *q, *nq;
 736         thread_t self = current_thread();
 737         thread_act_t th_act_self = current_act();
 738         struct task *task = p->task;
 739         register int i,s;
 740         struct uthread *ut;
 741
 742         /*
 743          * If a thread in this task has already
 744          * called exit(), then halt any others
 745          * right here.
 746          */
 747
 748          ut = get_bsdthread_info(th_act_self);
 749 #ifdef FIXME
 750         signal_lock(p);
 751         while (p->exit_thread != self) {
 752                 if (sig_try_locked(p) <= 0) {
 753                         if (get_threadtask(th_act_self) != task) {
 754                                 signal_unlock(p);
 755                                 return;
 756                         }
 757                         signal_unlock(p);
 758                         thread_terminate(th_act_self);
 759                         thread_funnel_set(kernel_flock, FALSE);
 760                         thread_exception_return();
 761                         /* NOTREACHED */
 762                 }
 763                 sig_lock_to_exit(p);
 764         }
 765         signal_unlock(p);
 766         if (p->p_pid == 1) {
 767                 printf("pid 1 exited (signal %d, exit %d)",
 768                     WTERMSIG(rv), WEXITSTATUS(rv));
 769 panic("init died\nState at Last Exception:\n\n%s", init_task_failure_data);
 770         }
 771 #endif /* FIXME */
 772
 773         s = splsched();
 774         p->p_flag |= P_WEXIT;
 775         splx(s);
 776         /*
 777          * Remove proc from allproc queue and from pidhash chain.
 778          * Need to do this before we do anything that can block.
 779          * Not doing causes things like mount() find this on allproc
 780          * in partially cleaned state.
 781          */
 782         LIST_REMOVE(p, p_list);
 783         LIST_REMOVE(p, p_hash);
 784         /*
 785          * If parent is waiting for us to exit or exec,
 786          * P_PPWAIT is set; we will wakeup the parent below.
 787          */
 788         p->p_flag &= ~(P_TRACED | P_PPWAIT);
 789         p->p_sigignore = ~0;
 790         p->p_siglist = 0;
 791
 792         ut->uu_sig = 0;
 793         untimeout(realitexpire, (caddr_t)p);
 794
 795         p->p_xstat = rv;
 796
 797         vproc_exit(p);
 798 }
 799
 800 void
 801 vproc_exit(struct proc *p)
 802 {
 803         register struct proc *q, *nq;
 804         thread_t self = current_thread();
 805         thread_act_t th_act_self = current_act();
 806         struct task *task = p->task;
 807         register int i,s;
 808         boolean_t funnel_state;
 809
 810         MALLOC_ZONE(p->p_ru, struct rusage *,
 811                         sizeof (*p->p_ru), M_ZOMBIE, M_WAITOK);
 812
 813         /*
 814          * Close open files and release open-file table.
 815          * This may block!
 816          */
 817         fdfree(p);
 818
 819         /* Close ref SYSV Shared memory*/
 820         if (p->vm_shm)
 821                 shmexit(p);
 822
 823         if (SESS_LEADER(p)) {
 824                 register struct session *sp = p->p_session;
 825
 826                 if (sp->s_ttyvp) {
 827                         /*
 828                          * Controlling process.
 829                          * Signal foreground pgrp,
 830                          * drain controlling terminal
 831                          * and revoke access to controlling terminal.
 832                          */
 833                         if (sp->s_ttyp->t_session == sp) {
 834                                 if (sp->s_ttyp->t_pgrp)
 835                                         pgsignal(sp->s_ttyp->t_pgrp, SIGHUP, 1);
 836                                 (void) ttywait(sp->s_ttyp);
 837                                 /*
 838                                  * The tty could have been revoked
 839                                  * if we blocked.
 840                                  */
 841                                 if (sp->s_ttyvp)
 842                                         VOP_REVOKE(sp->s_ttyvp, REVOKEALL);
 843                         }
 844                         if (sp->s_ttyvp)
 845                                 vrele(sp->s_ttyvp);
 846                         sp->s_ttyvp = NULL;
 847                         /*
 848                          * s_ttyp is not zero'd; we use this to indicate
 849                          * that the session once had a controlling terminal.
 850                          * (for logging and informational purposes)
 851                          */
 852                 }
 853                 sp->s_leader = NULL;
 854         }
 855
 856         fixjobc(p, p->p_pgrp, 0);
 857         p->p_rlimit[RLIMIT_FSIZE].rlim_cur = RLIM_INFINITY;
 858 #if KTRACE
 859         /*
 860          * release trace file
 861          */
 862         p->p_traceflag = 0;     /* don't trace the vrele() */
 863         if (p->p_tracep)
 864                 vrele(p->p_tracep);
 865 #endif
 866
 867         q = p->p_children.lh_first;
 868         if (q)          /* only need this if any child is S_ZOMB */
 869                 wakeup((caddr_t) initproc);
 870         for (; q != 0; q = nq) {
 871                 nq = q->p_sibling.le_next;
 872                 proc_reparent(q, initproc);
 873                 /*
 874                  * Traced processes are killed
 875                  * since their existence means someone is messing up.
 876                  */
 877                 if (q->p_flag & P_TRACED) {
 878                         q->p_flag &= ~P_TRACED;
 879                         if (q->sigwait_thread) {
 880                                 thread_t sig_shuttle  = getshuttle_thread(q->sigwait_thread);
 881                                 /*
 882                                  * The sigwait_thread could be stopped at a
 883                                  * breakpoint. Wake it up to kill.
 884                                  * Need to do this as it could be a thread which is not
 885                                  * the first thread in the task. So any attempts to kill
 886                                  * the process would result into a deadlock on q->sigwait.
 887                                  */
 888                                 thread_resume((struct thread *)q->sigwait_thread);
 889                                 clear_wait(sig_shuttle, THREAD_INTERRUPTED);
 890                                 threadsignal(q->sigwait_thread, SIGKILL, 0);
 891                         }
 892                         psignal(q, SIGKILL);
 893                 }
 894         }
 895
 896         /*
 897          * Save exit status and final rusage info, adding in child rusage
 898          * info and self times.
 899          */
 900         *p->p_ru = p->p_stats->p_ru;
 901
 902         timerclear(&p->p_ru->ru_utime);
 903         timerclear(&p->p_ru->ru_stime);
 904
 905 #ifdef  FIXME
 906         if (task) {
 907                 task_basic_info_data_t tinfo;
 908                 task_thread_times_info_data_t ttimesinfo;
 909                 int task_info_stuff, task_ttimes_stuff;
 910                 struct timeval ut,st;
 911
 912                 task_info_stuff = TASK_BASIC_INFO_COUNT;
 913                 task_info(task, TASK_BASIC_INFO,
 914                           &tinfo, &task_info_stuff);
 915                 p->p_ru->ru_utime.tv_sec = tinfo.user_time.seconds;
 916                 p->p_ru->ru_utime.tv_usec = tinfo.user_time.microseconds;
 917                 p->p_ru->ru_stime.tv_sec = tinfo.system_time.seconds;
 918                 p->p_ru->ru_stime.tv_usec = tinfo.system_time.microseconds;
 919
 920                 task_ttimes_stuff = TASK_THREAD_TIMES_INFO_COUNT;
 921                 task_info(task, TASK_THREAD_TIMES_INFO,
 922                           &ttimesinfo, &task_ttimes_stuff);
 923
 924                 ut.tv_sec = ttimesinfo.user_time.seconds;
 925                 ut.tv_usec = ttimesinfo.user_time.microseconds;
 926                 st.tv_sec = ttimesinfo.system_time.seconds;
 927                 st.tv_usec = ttimesinfo.system_time.microseconds;
 928                 timeradd(&ut,&p->p_ru->ru_utime,&p->p_ru->ru_utime);
 929                 timeradd(&st,&p->p_ru->ru_stime,&p->p_ru->ru_stime);
 930         }
 931 #endif /* FIXME */
 932
 933         ruadd(p->p_ru, &p->p_stats->p_cru);
 934
 935         /*
 936          * Free up profiling buffers.
 937          */
 938         {
 939                 struct uprof *p0 = &p->p_stats->p_prof, *p1, *pn;
 940
 941                 p1 = p0->pr_next;
 942                 p0->pr_next = NULL;
 943                 p0->pr_scale = 0;
 944
 945                 for (; p1 != NULL; p1 = pn) {
 946                         pn = p1->pr_next;
 947                         kfree((vm_offset_t)p1, sizeof *p1);
 948                 }
 949         }
 950
 951         /*
 952          * Other substructures are freed from wait().
 953          */
 954         FREE_ZONE(p->p_stats, sizeof *p->p_stats, M_SUBPROC);
 955         p->p_stats = NULL;
 956
 957         FREE_ZONE(p->p_sigacts, sizeof *p->p_sigacts, M_SUBPROC);
 958         p->p_sigacts = NULL;
 959
 960         if (--p->p_limit->p_refcnt == 0)
 961                 FREE_ZONE(p->p_limit, sizeof *p->p_limit, M_SUBPROC);
 962         p->p_limit = NULL;
 963
 964         /*
 965          * Finish up by terminating the task
 966          * and halt this thread (only if a
 967          * member of the task exiting).
 968          */
 969         p->task = TASK_NULL;
 970
 971         /*
 972          * Notify parent that we're gone.
 973          */
 974         psignal(p->p_pptr, SIGCHLD);
 975
 976         /* Place onto zombproc. */
 977         LIST_INSERT_HEAD(&zombproc, p, p_list);
 978         p->p_stat = SZOMB;
 979
 980         /* and now wakeup the parent */
 981         wakeup((caddr_t)p->p_pptr);
 982 }