1 /* $OpenBSD: kern_exit.c,v 1.190 2020/10/15 16:31:11 cheloha Exp $ */ 2 /* $NetBSD: kern_exit.c,v 1.39 1996/04/22 01:38:25 christos Exp $ */ 3 4 /* 5 * Copyright (c) 1982, 1986, 1989, 1991, 1993 6 * The Regents of the University of California. All rights reserved. 7 * (c) UNIX System Laboratories, Inc. 8 * All or some portions of this file are derived from material licensed 9 * to the University of California by American Telephone and Telegraph 10 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 11 * the permission of UNIX System Laboratories, Inc. 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 3. Neither the name of the University nor the names of its contributors 22 * may be used to endorse or promote products derived from this software 23 * without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35 * SUCH DAMAGE. 36 * 37 * @(#)kern_exit.c 8.7 (Berkeley) 2/12/94 38 */ 39 40 #include <sys/param.h> 41 #include <sys/systm.h> 42 #include <sys/ioctl.h> 43 #include <sys/proc.h> 44 #include <sys/tty.h> 45 #include <sys/time.h> 46 #include <sys/resource.h> 47 #include <sys/kernel.h> 48 #include <sys/sysctl.h> 49 #include <sys/wait.h> 50 #include <sys/vnode.h> 51 #include <sys/syslog.h> 52 #include <sys/malloc.h> 53 #include <sys/resourcevar.h> 54 #include <sys/ptrace.h> 55 #include <sys/acct.h> 56 #include <sys/filedesc.h> 57 #include <sys/signalvar.h> 58 #include <sys/sched.h> 59 #include <sys/ktrace.h> 60 #include <sys/pool.h> 61 #include <sys/mutex.h> 62 #include <sys/pledge.h> 63 #ifdef SYSVSEM 64 #include <sys/sem.h> 65 #endif 66 #include <sys/witness.h> 67 68 #include <sys/mount.h> 69 #include <sys/syscallargs.h> 70 71 #include <uvm/uvm_extern.h> 72 73 #include "kcov.h" 74 #if NKCOV > 0 75 #include <sys/kcov.h> 76 #endif 77 78 void proc_finish_wait(struct proc *, struct proc *); 79 void process_clear_orphan(struct process *); 80 void process_zap(struct process *); 81 void proc_free(struct proc *); 82 void unveil_destroy(struct process *ps); 83 84 /* 85 * exit -- 86 * Death of process. 87 */ 88 int 89 sys_exit(struct proc *p, void *v, register_t *retval) 90 { 91 struct sys_exit_args /* { 92 syscallarg(int) rval; 93 } */ *uap = v; 94 95 exit1(p, SCARG(uap, rval), 0, EXIT_NORMAL); 96 /* NOTREACHED */ 97 return (0); 98 } 99 100 int 101 sys___threxit(struct proc *p, void *v, register_t *retval) 102 { 103 struct sys___threxit_args /* { 104 syscallarg(pid_t *) notdead; 105 } */ *uap = v; 106 107 if (SCARG(uap, notdead) != NULL) { 108 pid_t zero = 0; 109 if (copyout(&zero, SCARG(uap, notdead), sizeof(zero))) 110 psignal(p, SIGSEGV); 111 } 112 exit1(p, 0, 0, EXIT_THREAD); 113 114 return (0); 115 } 116 117 /* 118 * Exit: deallocate address space and other resources, change proc state 119 * to zombie, and unlink proc from allproc and parent's lists. Save exit 120 * status and rusage for wait(). Check for child processes and orphan them. 121 */ 122 void 123 exit1(struct proc *p, int xexit, int xsig, int flags) 124 { 125 struct process *pr, *qr, *nqr; 126 struct rusage *rup; 127 128 atomic_setbits_int(&p->p_flag, P_WEXIT); 129 130 pr = p->p_p; 131 132 /* single-threaded? */ 133 if (!P_HASSIBLING(p)) { 134 flags = EXIT_NORMAL; 135 } else { 136 /* nope, multi-threaded */ 137 if (flags == EXIT_NORMAL) 138 single_thread_set(p, SINGLE_EXIT, 0); 139 else if (flags == EXIT_THREAD) 140 single_thread_check(p, 0); 141 } 142 143 if (flags == EXIT_NORMAL) { 144 if (pr->ps_pid == 1) 145 panic("init died (signal %d, exit %d)", xsig, xexit); 146 147 atomic_setbits_int(&pr->ps_flags, PS_EXITING); 148 pr->ps_xexit = xexit; 149 pr->ps_xsig = xsig; 150 151 /* 152 * If parent is waiting for us to exit or exec, PS_PPWAIT 153 * is set; we wake up the parent early to avoid deadlock. 154 */ 155 if (pr->ps_flags & PS_PPWAIT) { 156 atomic_clearbits_int(&pr->ps_flags, PS_PPWAIT); 157 atomic_clearbits_int(&pr->ps_pptr->ps_flags, 158 PS_ISPWAIT); 159 wakeup(pr->ps_pptr); 160 } 161 } 162 163 /* unlink ourselves from the active threads */ 164 TAILQ_REMOVE(&pr->ps_threads, p, p_thr_link); 165 if ((p->p_flag & P_THREAD) == 0) { 166 /* main thread gotta wait because it has the pid, et al */ 167 while (pr->ps_refcnt > 1) 168 tsleep_nsec(&pr->ps_threads, PWAIT, "thrdeath", INFSLP); 169 if (pr->ps_flags & PS_PROFIL) 170 stopprofclock(pr); 171 } 172 173 rup = pr->ps_ru; 174 if (rup == NULL) { 175 rup = pool_get(&rusage_pool, PR_WAITOK | PR_ZERO); 176 if (pr->ps_ru == NULL) { 177 pr->ps_ru = rup; 178 } else { 179 pool_put(&rusage_pool, rup); 180 rup = pr->ps_ru; 181 } 182 } 183 p->p_siglist = 0; 184 if ((p->p_flag & P_THREAD) == 0) 185 pr->ps_siglist = 0; 186 187 #if NKCOV > 0 188 kcov_exit(p); 189 #endif 190 191 if ((p->p_flag & P_THREAD) == 0) { 192 sigio_freelist(&pr->ps_sigiolst); 193 194 /* close open files and release open-file table */ 195 fdfree(p); 196 197 cancel_all_itimers(); 198 199 timeout_del(&pr->ps_rucheck_to); 200 #ifdef SYSVSEM 201 semexit(pr); 202 #endif 203 killjobc(pr); 204 #ifdef ACCOUNTING 205 acct_process(p); 206 #endif 207 208 #ifdef KTRACE 209 /* release trace file */ 210 if (pr->ps_tracevp) 211 ktrcleartrace(pr); 212 #endif 213 214 unveil_destroy(pr); 215 216 /* 217 * If parent has the SAS_NOCLDWAIT flag set, we're not 218 * going to become a zombie. 219 */ 220 if (pr->ps_pptr->ps_sigacts->ps_sigflags & SAS_NOCLDWAIT) 221 atomic_setbits_int(&pr->ps_flags, PS_NOZOMBIE); 222 } 223 224 p->p_fd = NULL; /* zap the thread's copy */ 225 226 /* 227 * Remove proc from pidhash chain and allproc so looking 228 * it up won't work. We will put the proc on the 229 * deadproc list later (using the p_hash member), and 230 * wake up the reaper when we do. If this is the last 231 * thread of a process that isn't PS_NOZOMBIE, we'll put 232 * the process on the zombprocess list below. 233 */ 234 /* 235 * NOTE: WE ARE NO LONGER ALLOWED TO SLEEP! 236 */ 237 p->p_stat = SDEAD; 238 239 LIST_REMOVE(p, p_hash); 240 LIST_REMOVE(p, p_list); 241 242 if ((p->p_flag & P_THREAD) == 0) { 243 LIST_REMOVE(pr, ps_hash); 244 LIST_REMOVE(pr, ps_list); 245 246 if ((pr->ps_flags & PS_NOZOMBIE) == 0) 247 LIST_INSERT_HEAD(&zombprocess, pr, ps_list); 248 else { 249 /* 250 * Not going to be a zombie, so it's now off all 251 * the lists scanned by ispidtaken(), so block 252 * fast reuse of the pid now. 253 */ 254 freepid(pr->ps_pid); 255 } 256 257 /* 258 * Reparent children to their original parent, in case 259 * they were being traced, or to init(8). 260 */ 261 qr = LIST_FIRST(&pr->ps_children); 262 if (qr) /* only need this if any child is S_ZOMB */ 263 wakeup(initprocess); 264 for (; qr != 0; qr = nqr) { 265 nqr = LIST_NEXT(qr, ps_sibling); 266 /* 267 * Traced processes are killed since their 268 * existence means someone is screwing up. 269 */ 270 if (qr->ps_flags & PS_TRACED && 271 !(qr->ps_flags & PS_EXITING)) { 272 process_untrace(qr); 273 274 /* 275 * If single threading is active, 276 * direct the signal to the active 277 * thread to avoid deadlock. 278 */ 279 if (qr->ps_single) 280 ptsignal(qr->ps_single, SIGKILL, 281 STHREAD); 282 else 283 prsignal(qr, SIGKILL); 284 } else { 285 process_reparent(qr, initprocess); 286 } 287 } 288 289 /* 290 * Make sure orphans won't remember the exiting process. 291 */ 292 while ((qr = LIST_FIRST(&pr->ps_orphans)) != NULL) { 293 KASSERT(qr->ps_oppid == pr->ps_pid); 294 qr->ps_oppid = 0; 295 process_clear_orphan(qr); 296 } 297 } 298 299 /* add thread's accumulated rusage into the process's total */ 300 ruadd(rup, &p->p_ru); 301 tuagg(pr, p); 302 303 /* 304 * clear %cpu usage during swap 305 */ 306 p->p_pctcpu = 0; 307 308 if ((p->p_flag & P_THREAD) == 0) { 309 /* 310 * Final thread has died, so add on our children's rusage 311 * and calculate the total times 312 */ 313 calcru(&pr->ps_tu, &rup->ru_utime, &rup->ru_stime, NULL); 314 ruadd(rup, &pr->ps_cru); 315 316 /* notify interested parties of our demise and clean up */ 317 knote_processexit(p); 318 319 /* 320 * Notify parent that we're gone. If we're not going to 321 * become a zombie, reparent to process 1 (init) so that 322 * we can wake our original parent to possibly unblock 323 * wait4() to return ECHILD. 324 */ 325 if (pr->ps_flags & PS_NOZOMBIE) { 326 struct process *ppr = pr->ps_pptr; 327 process_reparent(pr, initprocess); 328 wakeup(ppr); 329 } 330 331 /* 332 * Release the process's signal state. 333 */ 334 sigactsfree(pr); 335 } 336 337 /* just a thread? detach it from its process */ 338 if (p->p_flag & P_THREAD) { 339 /* scheduler_wait_hook(pr->ps_mainproc, p); XXX */ 340 if (--pr->ps_refcnt == 1) 341 wakeup(&pr->ps_threads); 342 KASSERT(pr->ps_refcnt > 0); 343 } 344 345 /* Release the thread's read reference of resource limit structure. */ 346 if (p->p_limit != NULL) { 347 struct plimit *limit; 348 349 limit = p->p_limit; 350 p->p_limit = NULL; 351 lim_free(limit); 352 } 353 354 /* 355 * Other substructures are freed from reaper and wait(). 356 */ 357 358 /* 359 * Finally, call machine-dependent code to switch to a new 360 * context (possibly the idle context). Once we are no longer 361 * using the dead process's vmspace and stack, exit2() will be 362 * called to schedule those resources to be released by the 363 * reaper thread. 364 * 365 * Note that cpu_exit() will end with a call equivalent to 366 * cpu_switch(), finishing our execution (pun intended). 367 */ 368 uvmexp.swtch++; 369 cpu_exit(p); 370 panic("cpu_exit returned"); 371 } 372 373 /* 374 * Locking of this proclist is special; it's accessed in a 375 * critical section of process exit, and thus locking it can't 376 * modify interrupt state. We use a simple spin lock for this 377 * proclist. We use the p_hash member to linkup to deadproc. 378 */ 379 struct mutex deadproc_mutex = 380 MUTEX_INITIALIZER_FLAGS(IPL_NONE, "deadproc", MTX_NOWITNESS); 381 struct proclist deadproc = LIST_HEAD_INITIALIZER(deadproc); 382 383 /* 384 * We are called from cpu_exit() once it is safe to schedule the 385 * dead process's resources to be freed. 386 * 387 * NOTE: One must be careful with locking in this routine. It's 388 * called from a critical section in machine-dependent code, so 389 * we should refrain from changing any interrupt state. 390 * 391 * We lock the deadproc list, place the proc on that list (using 392 * the p_hash member), and wake up the reaper. 393 */ 394 void 395 exit2(struct proc *p) 396 { 397 mtx_enter(&deadproc_mutex); 398 LIST_INSERT_HEAD(&deadproc, p, p_hash); 399 mtx_leave(&deadproc_mutex); 400 401 wakeup(&deadproc); 402 } 403 404 void 405 proc_free(struct proc *p) 406 { 407 crfree(p->p_ucred); 408 pool_put(&proc_pool, p); 409 nthreads--; 410 } 411 412 /* 413 * Process reaper. This is run by a kernel thread to free the resources 414 * of a dead process. Once the resources are free, the process becomes 415 * a zombie, and the parent is allowed to read the undead's status. 416 */ 417 void 418 reaper(void *arg) 419 { 420 struct proc *p; 421 422 KERNEL_UNLOCK(); 423 424 SCHED_ASSERT_UNLOCKED(); 425 426 for (;;) { 427 mtx_enter(&deadproc_mutex); 428 while ((p = LIST_FIRST(&deadproc)) == NULL) 429 msleep_nsec(&deadproc, &deadproc_mutex, PVM, "reaper", 430 INFSLP); 431 432 /* Remove us from the deadproc list. */ 433 LIST_REMOVE(p, p_hash); 434 mtx_leave(&deadproc_mutex); 435 436 WITNESS_THREAD_EXIT(p); 437 438 KERNEL_LOCK(); 439 440 /* 441 * Free the VM resources we're still holding on to. 442 * We must do this from a valid thread because doing 443 * so may block. 444 */ 445 uvm_uarea_free(p); 446 p->p_vmspace = NULL; /* zap the thread's copy */ 447 448 if (p->p_flag & P_THREAD) { 449 /* Just a thread */ 450 proc_free(p); 451 } else { 452 struct process *pr = p->p_p; 453 454 /* Release the rest of the process's vmspace */ 455 uvm_exit(pr); 456 457 if ((pr->ps_flags & PS_NOZOMBIE) == 0) { 458 /* Process is now a true zombie. */ 459 atomic_setbits_int(&pr->ps_flags, PS_ZOMBIE); 460 prsignal(pr->ps_pptr, SIGCHLD); 461 462 /* Wake up the parent so it can get exit status. */ 463 wakeup(pr->ps_pptr); 464 } else { 465 /* No one will wait for us. Just zap the process now */ 466 process_zap(pr); 467 } 468 } 469 470 KERNEL_UNLOCK(); 471 } 472 } 473 474 int 475 sys_wait4(struct proc *q, void *v, register_t *retval) 476 { 477 struct sys_wait4_args /* { 478 syscallarg(pid_t) pid; 479 syscallarg(int *) status; 480 syscallarg(int) options; 481 syscallarg(struct rusage *) rusage; 482 } */ *uap = v; 483 struct rusage ru; 484 int status, error; 485 486 error = dowait4(q, SCARG(uap, pid), 487 SCARG(uap, status) ? &status : NULL, 488 SCARG(uap, options), SCARG(uap, rusage) ? &ru : NULL, retval); 489 if (error == 0 && retval[0] > 0 && SCARG(uap, status)) { 490 error = copyout(&status, SCARG(uap, status), sizeof(status)); 491 } 492 if (error == 0 && retval[0] > 0 && SCARG(uap, rusage)) { 493 error = copyout(&ru, SCARG(uap, rusage), sizeof(ru)); 494 #ifdef KTRACE 495 if (error == 0 && KTRPOINT(q, KTR_STRUCT)) 496 ktrrusage(q, &ru); 497 #endif 498 } 499 return (error); 500 } 501 502 int 503 dowait4(struct proc *q, pid_t pid, int *statusp, int options, 504 struct rusage *rusage, register_t *retval) 505 { 506 int nfound; 507 struct process *pr; 508 struct proc *p; 509 int error; 510 511 if (pid == 0) 512 pid = -q->p_p->ps_pgid; 513 if (options &~ (WUNTRACED|WNOHANG|WCONTINUED)) 514 return (EINVAL); 515 516 loop: 517 nfound = 0; 518 LIST_FOREACH(pr, &q->p_p->ps_children, ps_sibling) { 519 if ((pr->ps_flags & PS_NOZOMBIE) || 520 (pid != WAIT_ANY && 521 pr->ps_pid != pid && 522 pr->ps_pgid != -pid)) 523 continue; 524 525 p = pr->ps_mainproc; 526 527 nfound++; 528 if (pr->ps_flags & PS_ZOMBIE) { 529 retval[0] = pr->ps_pid; 530 531 if (statusp != NULL) 532 *statusp = W_EXITCODE(pr->ps_xexit, 533 pr->ps_xsig); 534 if (rusage != NULL) 535 memcpy(rusage, pr->ps_ru, sizeof(*rusage)); 536 proc_finish_wait(q, p); 537 return (0); 538 } 539 if (pr->ps_flags & PS_TRACED && 540 (pr->ps_flags & PS_WAITED) == 0 && pr->ps_single && 541 pr->ps_single->p_stat == SSTOP && 542 (pr->ps_single->p_flag & P_SUSPSINGLE) == 0) { 543 if (single_thread_wait(pr, 0)) 544 goto loop; 545 546 atomic_setbits_int(&pr->ps_flags, PS_WAITED); 547 retval[0] = pr->ps_pid; 548 549 if (statusp != NULL) 550 *statusp = W_STOPCODE(pr->ps_xsig); 551 if (rusage != NULL) 552 memset(rusage, 0, sizeof(*rusage)); 553 return (0); 554 } 555 if (p->p_stat == SSTOP && 556 (pr->ps_flags & PS_WAITED) == 0 && 557 (p->p_flag & P_SUSPSINGLE) == 0 && 558 (pr->ps_flags & PS_TRACED || 559 options & WUNTRACED)) { 560 atomic_setbits_int(&pr->ps_flags, PS_WAITED); 561 retval[0] = pr->ps_pid; 562 563 if (statusp != NULL) 564 *statusp = W_STOPCODE(pr->ps_xsig); 565 if (rusage != NULL) 566 memset(rusage, 0, sizeof(*rusage)); 567 return (0); 568 } 569 if ((options & WCONTINUED) && (p->p_flag & P_CONTINUED)) { 570 atomic_clearbits_int(&p->p_flag, P_CONTINUED); 571 retval[0] = pr->ps_pid; 572 573 if (statusp != NULL) 574 *statusp = _WCONTINUED; 575 if (rusage != NULL) 576 memset(rusage, 0, sizeof(*rusage)); 577 return (0); 578 } 579 } 580 /* 581 * Look in the orphans list too, to allow the parent to 582 * collect it's child exit status even if child is being 583 * debugged. 584 * 585 * Debugger detaches from the parent upon successful 586 * switch-over from parent to child. At this point due to 587 * re-parenting the parent loses the child to debugger and a 588 * wait4(2) call would report that it has no children to wait 589 * for. By maintaining a list of orphans we allow the parent 590 * to successfully wait until the child becomes a zombie. 591 */ 592 if (nfound == 0) { 593 LIST_FOREACH(pr, &q->p_p->ps_orphans, ps_orphan) { 594 if ((pr->ps_flags & PS_NOZOMBIE) || 595 (pid != WAIT_ANY && 596 pr->ps_pid != pid && 597 pr->ps_pgid != -pid)) 598 continue; 599 nfound++; 600 break; 601 } 602 } 603 if (nfound == 0) 604 return (ECHILD); 605 if (options & WNOHANG) { 606 retval[0] = 0; 607 return (0); 608 } 609 if ((error = tsleep_nsec(q->p_p, PWAIT | PCATCH, "wait", INFSLP)) != 0) 610 return (error); 611 goto loop; 612 } 613 614 void 615 proc_finish_wait(struct proc *waiter, struct proc *p) 616 { 617 struct process *pr, *tr; 618 struct rusage *rup; 619 620 /* 621 * If we got the child via a ptrace 'attach', 622 * we need to give it back to the old parent. 623 */ 624 pr = p->p_p; 625 if (pr->ps_oppid != 0 && (pr->ps_oppid != pr->ps_pptr->ps_pid) && 626 (tr = prfind(pr->ps_oppid))) { 627 pr->ps_oppid = 0; 628 atomic_clearbits_int(&pr->ps_flags, PS_TRACED); 629 process_reparent(pr, tr); 630 prsignal(tr, SIGCHLD); 631 wakeup(tr); 632 } else { 633 scheduler_wait_hook(waiter, p); 634 rup = &waiter->p_p->ps_cru; 635 ruadd(rup, pr->ps_ru); 636 LIST_REMOVE(pr, ps_list); /* off zombprocess */ 637 freepid(pr->ps_pid); 638 process_zap(pr); 639 } 640 } 641 642 /* 643 * give process back to original parent or init(8) 644 */ 645 void 646 process_untrace(struct process *pr) 647 { 648 struct process *ppr = NULL; 649 650 KASSERT(pr->ps_flags & PS_TRACED); 651 652 if (pr->ps_oppid != 0 && 653 (pr->ps_oppid != pr->ps_pptr->ps_pid)) 654 ppr = prfind(pr->ps_oppid); 655 656 /* not being traced any more */ 657 pr->ps_oppid = 0; 658 atomic_clearbits_int(&pr->ps_flags, PS_TRACED); 659 process_reparent(pr, ppr ? ppr : initprocess); 660 } 661 662 void 663 process_clear_orphan(struct process *pr) 664 { 665 if (pr->ps_flags & PS_ORPHAN) { 666 LIST_REMOVE(pr, ps_orphan); 667 atomic_clearbits_int(&pr->ps_flags, PS_ORPHAN); 668 } 669 } 670 671 /* 672 * make process 'parent' the new parent of process 'child'. 673 */ 674 void 675 process_reparent(struct process *child, struct process *parent) 676 { 677 678 if (child->ps_pptr == parent) 679 return; 680 681 KASSERT(child->ps_oppid == 0 || 682 child->ps_oppid == child->ps_pptr->ps_pid); 683 684 LIST_REMOVE(child, ps_sibling); 685 LIST_INSERT_HEAD(&parent->ps_children, child, ps_sibling); 686 687 process_clear_orphan(child); 688 if (child->ps_flags & PS_TRACED) { 689 atomic_setbits_int(&child->ps_flags, PS_ORPHAN); 690 LIST_INSERT_HEAD(&child->ps_pptr->ps_orphans, child, ps_orphan); 691 } 692 693 child->ps_pptr = parent; 694 } 695 696 void 697 process_zap(struct process *pr) 698 { 699 struct vnode *otvp; 700 struct proc *p = pr->ps_mainproc; 701 702 /* 703 * Finally finished with old proc entry. 704 * Unlink it from its process group and free it. 705 */ 706 leavepgrp(pr); 707 LIST_REMOVE(pr, ps_sibling); 708 process_clear_orphan(pr); 709 710 /* 711 * Decrement the count of procs running with this uid. 712 */ 713 (void)chgproccnt(pr->ps_ucred->cr_ruid, -1); 714 715 /* 716 * Release reference to text vnode 717 */ 718 otvp = pr->ps_textvp; 719 pr->ps_textvp = NULL; 720 if (otvp) 721 vrele(otvp); 722 723 KASSERT(pr->ps_refcnt == 1); 724 if (pr->ps_ptstat != NULL) 725 free(pr->ps_ptstat, M_SUBPROC, sizeof(*pr->ps_ptstat)); 726 pool_put(&rusage_pool, pr->ps_ru); 727 KASSERT(TAILQ_EMPTY(&pr->ps_threads)); 728 lim_free(pr->ps_limit); 729 crfree(pr->ps_ucred); 730 pool_put(&process_pool, pr); 731 nprocesses--; 732 733 proc_free(p); 734 } 735