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                         struct vnode *ttyvp;
 271
 272                         /*
 273                          * Controlling process.
 274                          * Signal foreground pgrp,
 275                          * drain controlling terminal
 276                          * and revoke access to controlling terminal.
 277                          */
 278                         if (sp->s_ttyp->t_session == sp) {
 279                                 if (sp->s_ttyp->t_pgrp)
 280                                         pgsignal(sp->s_ttyp->t_pgrp, SIGHUP, 1);
 281                                 (void) ttywait(sp->s_ttyp);
 282                                 /*
 283                                  * The tty could have been revoked
 284                                  * if we blocked.
 285                                  */
 286                                 if (sp->s_ttyvp)
 287                                         VOP_REVOKE(sp->s_ttyvp, REVOKEALL);
 288                         }
 289                         ttyvp = sp->s_ttyvp;
 290                         sp->s_ttyvp = NULL;
 291                         if (ttyvp)
 292                                 vrele(ttyvp);
 293                         /*
 294                          * s_ttyp is not zero'd; we use this to indicate
 295                          * that the session once had a controlling terminal.
 296                          * (for logging and informational purposes)
 297                          */
 298                 }
 299                 sp->s_leader = NULL;
 300         }
 301
 302         fixjobc(p, p->p_pgrp, 0);
 303         p->p_rlimit[RLIMIT_FSIZE].rlim_cur = RLIM_INFINITY;
 304 #if KTRACE
 305         /*
 306          * release trace file
 307          */
 308         p->p_traceflag = 0;     /* don't trace the vrele() */
 309         if (p->p_tracep) {
 310                 struct vnode *tvp = p->p_tracep;
 311                 p->p_tracep = NULL;
 312                 vrele(tvp);
 313         }
 314 #endif
 315
 316
 317         q = p->p_children.lh_first;
 318         if (q)          /* only need this if any child is S_ZOMB */
 319                 wakeup((caddr_t) initproc);
 320         for (; q != 0; q = nq) {
 321                 nq = q->p_sibling.le_next;
 322                 proc_reparent(q, initproc);
 323                 /*
 324                  * Traced processes are killed
 325                  * since their existence means someone is messing up.
 326                  */
 327                 if (q->p_flag & P_TRACED) {
 328                         q->p_flag &= ~P_TRACED;
 329                         if (q->sigwait_thread) {
 330                                 thread_t sig_shuttle  = getshuttle_thread(q->sigwait_thread);
 331                                 /*
 332                                  * The sigwait_thread could be stopped at a
 333                                  * breakpoint. Wake it up to kill.
 334                                  * Need to do this as it could be a thread which is not
 335                                  * the first thread in the task. So any attempts to kill
 336                                  * the process would result into a deadlock on q->sigwait.
 337                                  */
 338                                 thread_resume((struct thread *)q->sigwait_thread);
 339                                 clear_wait(sig_shuttle, THREAD_INTERRUPTED);
 340                                 threadsignal(q->sigwait_thread, SIGKILL, 0);
 341                         }
 342                         psignal(q, SIGKILL);
 343                 }
 344         }
 345
 346         /*
 347          * Save exit status and final rusage info, adding in child rusage
 348          * info and self times.
 349          */
 350         *p->p_ru = p->p_stats->p_ru;
 351
 352         timerclear(&p->p_ru->ru_utime);
 353         timerclear(&p->p_ru->ru_stime);
 354
 355         if (task) {
 356                 task_basic_info_data_t tinfo;
 357                 task_thread_times_info_data_t ttimesinfo;
 358                 int task_info_stuff, task_ttimes_stuff;
 359                 struct timeval ut,st;
 360
 361                 task_info_stuff = TASK_BASIC_INFO_COUNT;
 362                 task_info(task, TASK_BASIC_INFO,
 363                           &tinfo, &task_info_stuff);
 364                 p->p_ru->ru_utime.tv_sec = tinfo.user_time.seconds;
 365                 p->p_ru->ru_utime.tv_usec = tinfo.user_time.microseconds;
 366                 p->p_ru->ru_stime.tv_sec = tinfo.system_time.seconds;
 367                 p->p_ru->ru_stime.tv_usec = tinfo.system_time.microseconds;
 368
 369                 task_ttimes_stuff = TASK_THREAD_TIMES_INFO_COUNT;
 370                 task_info(task, TASK_THREAD_TIMES_INFO,
 371                           &ttimesinfo, &task_ttimes_stuff);
 372
 373                 ut.tv_sec = ttimesinfo.user_time.seconds;
 374                 ut.tv_usec = ttimesinfo.user_time.microseconds;
 375                 st.tv_sec = ttimesinfo.system_time.seconds;
 376                 st.tv_usec = ttimesinfo.system_time.microseconds;
 377                 timeradd(&ut,&p->p_ru->ru_utime,&p->p_ru->ru_utime);
 378                 timeradd(&st,&p->p_ru->ru_stime,&p->p_ru->ru_stime);
 379         }
 380
 381         ruadd(p->p_ru, &p->p_stats->p_cru);
 382
 383         /*
 384          * Free up profiling buffers.
 385          */
 386         {
 387                 struct uprof *p0 = &p->p_stats->p_prof, *p1, *pn;
 388
 389                 p1 = p0->pr_next;
 390                 p0->pr_next = NULL;
 391                 p0->pr_scale = 0;
 392
 393                 for (; p1 != NULL; p1 = pn) {
 394                         pn = p1->pr_next;
 395                         kfree((vm_offset_t)p1, sizeof *p1);
 396                 }
 397         }
 398
 399         /*
 400          * Other substructures are freed from wait().
 401          */
 402         FREE_ZONE(p->p_stats, sizeof *p->p_stats, M_SUBPROC);
 403         p->p_stats = NULL;
 404
 405         FREE_ZONE(p->p_sigacts, sizeof *p->p_sigacts, M_SUBPROC);
 406         p->p_sigacts = NULL;
 407
 408         if (--p->p_limit->p_refcnt == 0)
 409                 FREE_ZONE(p->p_limit, sizeof *p->p_limit, M_SUBPROC);
 410         p->p_limit = NULL;
 411
 412         /*
 413          * Finish up by terminating the task
 414          * and halt this thread (only if a
 415          * member of the task exiting).
 416          */
 417         p->task = TASK_NULL;
 418         //task->proc = NULL;
 419         set_bsdtask_info(task, NULL);
 420
 421         /*
 422          * Notify parent that we're gone.
 423          */
 424         psignal(p->p_pptr, SIGCHLD);
 425
 426         /* Place onto zombproc. */
 427         LIST_INSERT_HEAD(&zombproc, p, p_list);
 428         p->p_stat = SZOMB;
 429
 430         /* and now wakeup the parent */
 431         wakeup((caddr_t)p->p_pptr);
 432
 433         (void) thread_funnel_set(kernel_flock, funnel_state);
 434 }
 435
 436
 437 struct wait4_args {
 438         int     pid;
 439         int *status;
 440         int options;
 441         struct rusage *rusage;
 442 };
 443
 444 #if COMPAT_43
 445 int
 446 owait(p, uap, retval)
 447         struct proc *p;
 448         void *uap;
 449         int *retval;
 450 {
 451         struct wait4_args *a;
 452
 453         a = (struct wait4_args *)get_bsduthreadarg(current_act());
 454
 455         a->options = 0;
 456         a->rusage = NULL;
 457         a->pid = WAIT_ANY;
 458         a->status = NULL;
 459         return (wait1(p, a, retval, 1));
 460 }
 461
 462 int
 463 wait4(p, uap, retval)
 464         struct proc *p;
 465         struct wait4_args *uap;
 466         int *retval;
 467 {
 468         return (wait1(p, uap, retval, 0));
 469 }
 470
 471 struct owait3_args {
 472         int *status;
 473         int options;
 474         struct rusage *rusage;
 475 };
 476
 477 int
 478 owait3(p, uap, retval)
 479         struct proc *p;
 480         struct owait3_args *uap;
 481         int *retval;
 482 {
 483         struct wait4_args *a;
 484
 485         a = (struct wait4_args *)get_bsduthreadarg(current_act);
 486
 487         a->rusage = uap->rusage;
 488         a->options = uap->options;
 489         a->status = uap->status;
 490         a->pid = WAIT_ANY;
 491
 492         return (wait1(p, a, retval, 1));
 493 }
 494
 495 #else
 496 #define wait1   wait4
 497 #endif
 498
 499 int
 500 wait1continue(result)
 501 {
 502         void *vt;
 503         thread_act_t thread;
 504         int *retval;
 505         struct proc *p;
 506
 507         if (result)
 508                 return(result);
 509
 510         p = current_proc();
 511         thread = current_act();
 512         vt = get_bsduthreadarg(thread);
 513         retval = get_bsduthreadrval(thread);
 514         wait1((struct proc *)p, (struct wait4_args *)vt, retval, 0);
 515 }
 516
 517 int
 518 wait1(q, uap, retval, compat)
 519         register struct proc *q;
 520         register struct wait4_args *uap;
 521         register_t *retval;
 522 #if COMPAT_43
 523         int compat;
 524 #endif
 525 {
 526         register int nfound;
 527         register struct proc *p, *t;
 528         int status, error;
 529         struct vnode *tvp;
 530
 531 retry:
 532         if (uap->pid == 0)
 533                 uap->pid = -q->p_pgid;
 534
 535 loop:
 536         nfound = 0;
 537         for (p = q->p_children.lh_first; p != 0; p = p->p_sibling.le_next) {
 538                 if (uap->pid != WAIT_ANY &&
 539                     p->p_pid != uap->pid &&
 540                     p->p_pgid != -(uap->pid))
 541                         continue;
 542                 nfound++;
 543                 if (p->p_flag & P_WAITING) {
 544                         (void)tsleep(&p->p_stat, PWAIT, "waitcoll", 0);
 545                         goto loop;
 546                 }
 547                 p->p_flag |= P_WAITING;   /* only allow single thread to wait() */
 548
 549                 if (p->p_stat == SZOMB) {
 550                         retval[0] = p->p_pid;
 551 #if COMPAT_43
 552                         if (compat)
 553                                 retval[1] = p->p_xstat;
 554                         else
 555 #endif
 556                         if (uap->status) {
 557                                 status = p->p_xstat;    /* convert to int */
 558                                 if (error = copyout((caddr_t)&status,
 559                                     (caddr_t)uap->status,
 560                                                     sizeof(status))) {
 561                                         p->p_flag &= ~P_WAITING;
 562                                         wakeup(&p->p_stat);
 563                                         return (error);
 564                                 }
 565                         }
 566                         if (uap->rusage &&
 567                             (error = copyout((caddr_t)p->p_ru,
 568                             (caddr_t)uap->rusage,
 569                                              sizeof (struct rusage)))) {
 570                                 p->p_flag &= ~P_WAITING;
 571                                 wakeup(&p->p_stat);
 572                                 return (error);
 573                         }
 574                         /*
 575                          * If we got the child via a ptrace 'attach',
 576                          * we need to give it back to the old parent.
 577                          */
 578                         if (p->p_oppid && (t = pfind(p->p_oppid))) {
 579                                 p->p_oppid = 0;
 580                                 proc_reparent(p, t);
 581                                 psignal(t, SIGCHLD);
 582                                 wakeup((caddr_t)t);
 583                                 p->p_flag &= ~P_WAITING;
 584                                 wakeup(&p->p_stat);
 585                                 return (0);
 586                         }
 587                         p->p_xstat = 0;
 588                         if (p->p_ru) {
 589                                 ruadd(&q->p_stats->p_cru, p->p_ru);
 590                                 FREE_ZONE(p->p_ru, sizeof *p->p_ru, M_ZOMBIE);
 591                                 p->p_ru = NULL;
 592                         } else {
 593                                 printf("Warning : lost p_ru for %s\n", p->p_comm);
 594                         }
 595
 596                         /*
 597                          * Decrement the count of procs running with this uid.
 598                          */
 599                         (void)chgproccnt(p->p_cred->p_ruid, -1);
 600
 601                         /*
 602                          * Free up credentials.
 603                          */
 604                         if (--p->p_cred->p_refcnt == 0) {
 605                                 struct ucred *ucr = p->p_ucred;
 606                                 struct pcred *pcr;
 607
 608                                 if (ucr != NOCRED) {
 609                                         p->p_ucred = NOCRED;
 610                                         crfree(ucr);
 611                                 }
 612                                 pcr = p->p_cred;
 613                                 p->p_cred = NULL;
 614                                 FREE_ZONE(pcr, sizeof *pcr, M_SUBPROC);
 615                         }
 616
 617                         /*
 618                          * Release reference to text vnode
 619                          */
 620                         tvp = p->p_textvp;
 621                         p->p_textvp = NULL;
 622                         if (tvp)
 623                                 vrele(tvp);
 624
 625                         /*
 626                          * Finally finished with old proc entry.
 627                          * Unlink it from its process group and free it.
 628                          */
 629                         leavepgrp(p);
 630                         LIST_REMOVE(p, p_list); /* off zombproc */
 631                         LIST_REMOVE(p, p_sibling);
 632                         p->p_flag &= ~P_WAITING;
 633                         FREE_ZONE(p, sizeof *p, M_PROC);
 634                         nprocs--;
 635                         wakeup(&p->p_stat);
 636                         return (0);
 637                 }
 638                 if (p->p_stat == SSTOP && (p->p_flag & P_WAITED) == 0 &&
 639                     (p->p_flag & P_TRACED || uap->options & WUNTRACED)) {
 640                         p->p_flag |= P_WAITED;
 641                         retval[0] = p->p_pid;
 642 #if COMPAT_43
 643                         if (compat) {
 644                                 retval[1] = W_STOPCODE(p->p_xstat);
 645                                 error = 0;
 646                         } else
 647 #endif
 648                         if (uap->status) {
 649                                 status = W_STOPCODE(p->p_xstat);
 650                                 error = copyout((caddr_t)&status,
 651                                     (caddr_t)uap->status,
 652                                     sizeof(status));
 653                         } else
 654                                 error = 0;
 655                         p->p_flag &= ~P_WAITING;
 656                         wakeup(&p->p_stat);
 657                         return (error);
 658                 }
 659                 p->p_flag &= ~P_WAITING;
 660                 wakeup(&p->p_stat);
 661         }
 662         if (nfound == 0)
 663                 return (ECHILD);
 664
 665         if (uap->options & WNOHANG) {
 666                 retval[0] = 0;
 667                 return (0);
 668         }
 669
 670         if (error = tsleep0((caddr_t)q, PWAIT | PCATCH, "wait", 0, wait1continue))
 671                 return (error);
 672
 673         goto loop;
 674 }
 675
 676 /*
 677  * make process 'parent' the new parent of process 'child'.
 678  */
 679 void
 680 proc_reparent(child, parent)
 681         register struct proc *child;
 682         register struct proc *parent;
 683 {
 684
 685         if (child->p_pptr == parent)
 686                 return;
 687
 688         LIST_REMOVE(child, p_sibling);
 689         LIST_INSERT_HEAD(&parent->p_children, child, p_sibling);
 690         child->p_pptr = parent;
 691 }
 692
 693 /*
 694  *      Make the current process an "init" process, meaning
 695  *      that it doesn't have a parent, and that it won't be
 696  *      gunned down by kill(-1, 0).
 697  */
 698 kern_return_t
 699 init_process(void)
 700 {
 701         register struct proc *p = current_proc();
 702
 703         if (suser(p->p_ucred, &p->p_acflag))
 704                 return(KERN_NO_ACCESS);
 705
 706         if (p->p_pid != 1 && p->p_pgid != p->p_pid)
 707                 enterpgrp(p, p->p_pid, 0);
 708         p->p_flag |= P_SYSTEM;
 709
 710         /*
 711          *      Take us out of the sibling chain, and
 712          *      out of our parent's child chain.
 713          */
 714         LIST_REMOVE(p, p_sibling);
 715         p->p_sibling.le_prev = NULL;
 716         p->p_sibling.le_next = NULL;
 717         p->p_pptr = kernproc;
 718
 719         return(KERN_SUCCESS);
 720 }
 721
 722 void
 723 process_terminate_self(void)
 724 {
 725         struct proc *p = current_proc();
 726
 727         if (p != NULL) {
 728                 exit1(p, W_EXITCODE(0, SIGKILL), (int *)NULL);
 729                 /*NOTREACHED*/
 730         }
 731 }
 732
 733 /*
 734  * Exit: deallocate address space and other resources, change proc state
 735  * to zombie, and unlink proc from allproc and parent's lists.  Save exit
 736  * status and rusage for wait().  Check for child processes and orphan them.
 737  */
 738
 739 void
 740 vfork_exit(p, rv)
 741         register struct proc *p;
 742         int rv;
 743 {
 744         register struct proc *q, *nq;
 745         thread_t self = current_thread();
 746         thread_act_t th_act_self = current_act();
 747         struct task *task = p->task;
 748         register int i,s;
 749         struct uthread *ut;
 750
 751         /*
 752          * If a thread in this task has already
 753          * called exit(), then halt any others
 754          * right here.
 755          */
 756
 757          ut = get_bsdthread_info(th_act_self);
 758 #ifdef FIXME
 759         signal_lock(p);
 760         while (p->exit_thread != self) {
 761                 if (sig_try_locked(p) <= 0) {
 762                         if (get_threadtask(th_act_self) != task) {
 763                                 signal_unlock(p);
 764                                 return;
 765                         }
 766                         signal_unlock(p);
 767                         thread_terminate(th_act_self);
 768                         thread_funnel_set(kernel_flock, FALSE);
 769                         thread_exception_return();
 770                         /* NOTREACHED */
 771                 }
 772                 sig_lock_to_exit(p);
 773         }
 774         signal_unlock(p);
 775         if (p->p_pid == 1) {
 776                 printf("pid 1 exited (signal %d, exit %d)",
 777                     WTERMSIG(rv), WEXITSTATUS(rv));
 778 panic("init died\nState at Last Exception:\n\n%s", init_task_failure_data);
 779         }
 780 #endif /* FIXME */
 781
 782         s = splsched();
 783         p->p_flag |= P_WEXIT;
 784         splx(s);
 785         /*
 786          * Remove proc from allproc queue and from pidhash chain.
 787          * Need to do this before we do anything that can block.
 788          * Not doing causes things like mount() find this on allproc
 789          * in partially cleaned state.
 790          */
 791         LIST_REMOVE(p, p_list);
 792         LIST_REMOVE(p, p_hash);
 793         /*
 794          * If parent is waiting for us to exit or exec,
 795          * P_PPWAIT is set; we will wakeup the parent below.
 796          */
 797         p->p_flag &= ~(P_TRACED | P_PPWAIT);
 798         p->p_sigignore = ~0;
 799         p->p_siglist = 0;
 800
 801         ut->uu_sig = 0;
 802         untimeout(realitexpire, (caddr_t)p);
 803
 804         p->p_xstat = rv;
 805
 806         vproc_exit(p);
 807 }
 808
 809 void
 810 vproc_exit(struct proc *p)
 811 {
 812         register struct proc *q, *nq;
 813         thread_t self = current_thread();
 814         thread_act_t th_act_self = current_act();
 815         struct task *task = p->task;
 816         register int i,s;
 817         boolean_t funnel_state;
 818
 819         MALLOC_ZONE(p->p_ru, struct rusage *,
 820                         sizeof (*p->p_ru), M_ZOMBIE, M_WAITOK);
 821
 822         /*
 823          * Close open files and release open-file table.
 824          * This may block!
 825          */
 826         fdfree(p);
 827
 828         /* Close ref SYSV Shared memory*/
 829         if (p->vm_shm)
 830                 shmexit(p);
 831
 832         if (SESS_LEADER(p)) {
 833                 register struct session *sp = p->p_session;
 834
 835                 if (sp->s_ttyvp) {
 836                         struct vnode *ttyvp;
 837
 838                         /*
 839                          * Controlling process.
 840                          * Signal foreground pgrp,
 841                          * drain controlling terminal
 842                          * and revoke access to controlling terminal.
 843                          */
 844                         if (sp->s_ttyp->t_session == sp) {
 845                                 if (sp->s_ttyp->t_pgrp)
 846                                         pgsignal(sp->s_ttyp->t_pgrp, SIGHUP, 1);
 847                                 (void) ttywait(sp->s_ttyp);
 848                                 /*
 849                                  * The tty could have been revoked
 850                                  * if we blocked.
 851                                  */
 852                                 if (sp->s_ttyvp)
 853                                         VOP_REVOKE(sp->s_ttyvp, REVOKEALL);
 854                         }
 855                         ttyvp = sp->s_ttyvp;
 856                         sp->s_ttyvp = NULL;
 857                         if (ttyvp)
 858                                 vrele(ttyvp);
 859                         /*
 860                          * s_ttyp is not zero'd; we use this to indicate
 861                          * that the session once had a controlling terminal.
 862                          * (for logging and informational purposes)
 863                          */
 864                 }
 865                 sp->s_leader = NULL;
 866         }
 867
 868         fixjobc(p, p->p_pgrp, 0);
 869         p->p_rlimit[RLIMIT_FSIZE].rlim_cur = RLIM_INFINITY;
 870 #if KTRACE
 871         /*
 872          * release trace file
 873          */
 874         p->p_traceflag = 0;     /* don't trace the vrele() */
 875         if (p->p_tracep) {
 876                 struct vnode *tvp = p->p_tracep;
 877                 p->p_tracep = NULL;
 878                 vrele(tvp);
 879         }
 880 #endif
 881
 882         q = p->p_children.lh_first;
 883         if (q)          /* only need this if any child is S_ZOMB */
 884                 wakeup((caddr_t) initproc);
 885         for (; q != 0; q = nq) {
 886                 nq = q->p_sibling.le_next;
 887                 proc_reparent(q, initproc);
 888                 /*
 889                  * Traced processes are killed
 890                  * since their existence means someone is messing up.
 891                  */
 892                 if (q->p_flag & P_TRACED) {
 893                         q->p_flag &= ~P_TRACED;
 894                         if (q->sigwait_thread) {
 895                                 thread_t sig_shuttle  = getshuttle_thread(q->sigwait_thread);
 896                                 /*
 897                                  * The sigwait_thread could be stopped at a
 898                                  * breakpoint. Wake it up to kill.
 899                                  * Need to do this as it could be a thread which is not
 900                                  * the first thread in the task. So any attempts to kill
 901                                  * the process would result into a deadlock on q->sigwait.
 902                                  */
 903                                 thread_resume((struct thread *)q->sigwait_thread);
 904                                 clear_wait(sig_shuttle, THREAD_INTERRUPTED);
 905                                 threadsignal(q->sigwait_thread, SIGKILL, 0);
 906                         }
 907                         psignal(q, SIGKILL);
 908                 }
 909         }
 910
 911         /*
 912          * Save exit status and final rusage info, adding in child rusage
 913          * info and self times.
 914          */
 915         *p->p_ru = p->p_stats->p_ru;
 916
 917         timerclear(&p->p_ru->ru_utime);
 918         timerclear(&p->p_ru->ru_stime);
 919
 920 #ifdef  FIXME
 921         if (task) {
 922                 task_basic_info_data_t tinfo;
 923                 task_thread_times_info_data_t ttimesinfo;
 924                 int task_info_stuff, task_ttimes_stuff;
 925                 struct timeval ut,st;
 926
 927                 task_info_stuff = TASK_BASIC_INFO_COUNT;
 928                 task_info(task, TASK_BASIC_INFO,
 929                           &tinfo, &task_info_stuff);
 930                 p->p_ru->ru_utime.tv_sec = tinfo.user_time.seconds;
 931                 p->p_ru->ru_utime.tv_usec = tinfo.user_time.microseconds;
 932                 p->p_ru->ru_stime.tv_sec = tinfo.system_time.seconds;
 933                 p->p_ru->ru_stime.tv_usec = tinfo.system_time.microseconds;
 934
 935                 task_ttimes_stuff = TASK_THREAD_TIMES_INFO_COUNT;
 936                 task_info(task, TASK_THREAD_TIMES_INFO,
 937                           &ttimesinfo, &task_ttimes_stuff);
 938
 939                 ut.tv_sec = ttimesinfo.user_time.seconds;
 940                 ut.tv_usec = ttimesinfo.user_time.microseconds;
 941                 st.tv_sec = ttimesinfo.system_time.seconds;
 942                 st.tv_usec = ttimesinfo.system_time.microseconds;
 943                 timeradd(&ut,&p->p_ru->ru_utime,&p->p_ru->ru_utime);
 944                 timeradd(&st,&p->p_ru->ru_stime,&p->p_ru->ru_stime);
 945         }
 946 #endif /* FIXME */
 947
 948         ruadd(p->p_ru, &p->p_stats->p_cru);
 949
 950         /*
 951          * Free up profiling buffers.
 952          */
 953         {
 954                 struct uprof *p0 = &p->p_stats->p_prof, *p1, *pn;
 955
 956                 p1 = p0->pr_next;
 957                 p0->pr_next = NULL;
 958                 p0->pr_scale = 0;
 959
 960                 for (; p1 != NULL; p1 = pn) {
 961                         pn = p1->pr_next;
 962                         kfree((vm_offset_t)p1, sizeof *p1);
 963                 }
 964         }
 965
 966         /*
 967          * Other substructures are freed from wait().
 968          */
 969         FREE_ZONE(p->p_stats, sizeof *p->p_stats, M_SUBPROC);
 970         p->p_stats = NULL;
 971
 972         FREE_ZONE(p->p_sigacts, sizeof *p->p_sigacts, M_SUBPROC);
 973         p->p_sigacts = NULL;
 974
 975         if (--p->p_limit->p_refcnt == 0)
 976                 FREE_ZONE(p->p_limit, sizeof *p->p_limit, M_SUBPROC);
 977         p->p_limit = NULL;
 978
 979         /*
 980          * Finish up by terminating the task
 981          * and halt this thread (only if a
 982          * member of the task exiting).
 983          */
 984         p->task = TASK_NULL;
 985
 986         /*
 987          * Notify parent that we're gone.
 988          */
 989         psignal(p->p_pptr, SIGCHLD);
 990
 991         /* Place onto zombproc. */
 992         LIST_INSERT_HEAD(&zombproc, p, p_list);
 993         p->p_stat = SZOMB;
 994
 995         /* and now wakeup the parent */
 996         wakeup((caddr_t)p->p_pptr);
 997 }