1 /* $OpenBSD: kern_proc.c,v 1.84 2018/06/21 13:58:21 visa Exp $ */ 2 /* $NetBSD: kern_proc.c,v 1.14 1996/02/09 18:59:41 christos Exp $ */ 3 4 /* 5 * Copyright (c) 1982, 1986, 1989, 1991, 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * @(#)kern_proc.c 8.4 (Berkeley) 1/4/94 33 */ 34 35 #include <sys/param.h> 36 #include <sys/systm.h> 37 #include <sys/kernel.h> 38 #include <sys/proc.h> 39 #include <sys/buf.h> 40 #include <sys/acct.h> 41 #include <sys/wait.h> 42 #include <sys/rwlock.h> 43 #include <ufs/ufs/quota.h> 44 #include <sys/uio.h> 45 #include <sys/malloc.h> 46 #include <sys/mbuf.h> 47 #include <sys/ioctl.h> 48 #include <sys/tty.h> 49 #include <sys/signalvar.h> 50 #include <sys/pool.h> 51 #include <sys/vnode.h> 52 53 struct rwlock uidinfolk; 54 #define UIHASH(uid) (&uihashtbl[(uid) & uihash]) 55 LIST_HEAD(uihashhead, uidinfo) *uihashtbl; 56 u_long uihash; /* size of hash table - 1 */ 57 58 /* 59 * Other process lists 60 */ 61 struct tidhashhead *tidhashtbl; 62 u_long tidhash; 63 struct pidhashhead *pidhashtbl; 64 u_long pidhash; 65 struct pgrphashhead *pgrphashtbl; 66 u_long pgrphash; 67 struct processlist allprocess; 68 struct processlist zombprocess; 69 struct proclist allproc; 70 71 struct pool proc_pool; 72 struct pool process_pool; 73 struct pool rusage_pool; 74 struct pool ucred_pool; 75 struct pool pgrp_pool; 76 struct pool session_pool; 77 78 void pgdelete(struct pgrp *); 79 void fixjobc(struct process *, struct pgrp *, int); 80 81 static void orphanpg(struct pgrp *); 82 #ifdef DEBUG 83 void pgrpdump(void); 84 #endif 85 86 /* 87 * Initialize global process hashing structures. 88 */ 89 void 90 procinit(void) 91 { 92 LIST_INIT(&allprocess); 93 LIST_INIT(&zombprocess); 94 LIST_INIT(&allproc); 95 96 rw_init(&uidinfolk, "uidinfo"); 97 98 tidhashtbl = hashinit(maxthread / 4, M_PROC, M_NOWAIT, &tidhash); 99 pidhashtbl = hashinit(maxprocess / 4, M_PROC, M_NOWAIT, &pidhash); 100 pgrphashtbl = hashinit(maxprocess / 4, M_PROC, M_NOWAIT, &pgrphash); 101 uihashtbl = hashinit(maxprocess / 16, M_PROC, M_NOWAIT, &uihash); 102 if (!tidhashtbl || !pidhashtbl || !pgrphashtbl || !uihashtbl) 103 panic("procinit: malloc"); 104 105 pool_init(&proc_pool, sizeof(struct proc), 0, IPL_NONE, 106 PR_WAITOK, "procpl", NULL); 107 pool_init(&process_pool, sizeof(struct process), 0, IPL_NONE, 108 PR_WAITOK, "processpl", NULL); 109 pool_init(&rusage_pool, sizeof(struct rusage), 0, IPL_NONE, 110 PR_WAITOK, "zombiepl", NULL); 111 pool_init(&ucred_pool, sizeof(struct ucred), 0, IPL_MPFLOOR, 112 PR_WAITOK, "ucredpl", NULL); 113 pool_init(&pgrp_pool, sizeof(struct pgrp), 0, IPL_NONE, 114 PR_WAITOK, "pgrppl", NULL); 115 pool_init(&session_pool, sizeof(struct session), 0, IPL_NONE, 116 PR_WAITOK, "sessionpl", NULL); 117 } 118 119 /* 120 * This returns with `uidinfolk' held: caller must call uid_release() 121 * after making whatever change they needed. 122 */ 123 struct uidinfo * 124 uid_find(uid_t uid) 125 { 126 struct uidinfo *uip, *nuip; 127 struct uihashhead *uipp; 128 129 uipp = UIHASH(uid); 130 rw_enter_write(&uidinfolk); 131 LIST_FOREACH(uip, uipp, ui_hash) 132 if (uip->ui_uid == uid) 133 break; 134 if (uip) 135 return (uip); 136 rw_exit_write(&uidinfolk); 137 nuip = malloc(sizeof(*nuip), M_PROC, M_WAITOK|M_ZERO); 138 rw_enter_write(&uidinfolk); 139 LIST_FOREACH(uip, uipp, ui_hash) 140 if (uip->ui_uid == uid) 141 break; 142 if (uip) { 143 free(nuip, M_PROC, sizeof(*nuip)); 144 return (uip); 145 } 146 nuip->ui_uid = uid; 147 LIST_INSERT_HEAD(uipp, nuip, ui_hash); 148 149 return (nuip); 150 } 151 152 void 153 uid_release(struct uidinfo *uip) 154 { 155 rw_exit_write(&uidinfolk); 156 } 157 158 /* 159 * Change the count associated with number of threads 160 * a given user is using. 161 */ 162 int 163 chgproccnt(uid_t uid, int diff) 164 { 165 struct uidinfo *uip; 166 long count; 167 168 uip = uid_find(uid); 169 count = (uip->ui_proccnt += diff); 170 uid_release(uip); 171 if (count < 0) 172 panic("chgproccnt: procs < 0"); 173 return count; 174 } 175 176 /* 177 * Is pr an inferior of parent? 178 */ 179 int 180 inferior(struct process *pr, struct process *parent) 181 { 182 183 for (; pr != parent; pr = pr->ps_pptr) 184 if (pr->ps_pid == 0 || pr->ps_pid == 1) 185 return (0); 186 return (1); 187 } 188 189 /* 190 * Locate a proc (thread) by number 191 */ 192 struct proc * 193 tfind(pid_t tid) 194 { 195 struct proc *p; 196 197 LIST_FOREACH(p, TIDHASH(tid), p_hash) 198 if (p->p_tid == tid) 199 return (p); 200 return (NULL); 201 } 202 203 /* 204 * Locate a process by number 205 */ 206 struct process * 207 prfind(pid_t pid) 208 { 209 struct process *pr; 210 211 LIST_FOREACH(pr, PIDHASH(pid), ps_hash) 212 if (pr->ps_pid == pid) 213 return (pr); 214 return (NULL); 215 } 216 217 /* 218 * Locate a process group by number 219 */ 220 struct pgrp * 221 pgfind(pid_t pgid) 222 { 223 struct pgrp *pgrp; 224 225 LIST_FOREACH(pgrp, PGRPHASH(pgid), pg_hash) 226 if (pgrp->pg_id == pgid) 227 return (pgrp); 228 return (NULL); 229 } 230 231 /* 232 * Locate a zombie process 233 */ 234 struct process * 235 zombiefind(pid_t pid) 236 { 237 struct process *pr; 238 239 LIST_FOREACH(pr, &zombprocess, ps_list) 240 if (pr->ps_pid == pid) 241 return (pr); 242 return (NULL); 243 } 244 245 /* 246 * Move process to a new process group. If a session is provided 247 * then it's a new session to contain this process group; otherwise 248 * the process is staying within its existing session. 249 */ 250 void 251 enternewpgrp(struct process *pr, struct pgrp *pgrp, struct session *newsess) 252 { 253 #ifdef DIAGNOSTIC 254 if (SESS_LEADER(pr)) 255 panic("%s: session leader attempted setpgrp", __func__); 256 #endif 257 258 if (newsess != NULL) { 259 /* 260 * New session. Initialize it completely 261 */ 262 timeout_set(&newsess->s_verauthto, zapverauth, newsess); 263 newsess->s_leader = pr; 264 newsess->s_count = 1; 265 newsess->s_ttyvp = NULL; 266 newsess->s_ttyp = NULL; 267 memcpy(newsess->s_login, pr->ps_session->s_login, 268 sizeof(newsess->s_login)); 269 atomic_clearbits_int(&pr->ps_flags, PS_CONTROLT); 270 pgrp->pg_session = newsess; 271 #ifdef DIAGNOSTIC 272 if (pr != curproc->p_p) 273 panic("%s: mksession but not curproc", __func__); 274 #endif 275 } else { 276 pgrp->pg_session = pr->ps_session; 277 pgrp->pg_session->s_count++; 278 } 279 pgrp->pg_id = pr->ps_pid; 280 LIST_INIT(&pgrp->pg_members); 281 LIST_INSERT_HEAD(PGRPHASH(pr->ps_pid), pgrp, pg_hash); 282 pgrp->pg_jobc = 0; 283 284 enterthispgrp(pr, pgrp); 285 } 286 287 /* 288 * move process to an existing process group 289 */ 290 void 291 enterthispgrp(struct process *pr, struct pgrp *pgrp) 292 { 293 struct pgrp *savepgrp = pr->ps_pgrp; 294 295 /* 296 * Adjust eligibility of affected pgrps to participate in job control. 297 * Increment eligibility counts before decrementing, otherwise we 298 * could reach 0 spuriously during the first call. 299 */ 300 fixjobc(pr, pgrp, 1); 301 fixjobc(pr, savepgrp, 0); 302 303 LIST_REMOVE(pr, ps_pglist); 304 pr->ps_pgrp = pgrp; 305 LIST_INSERT_HEAD(&pgrp->pg_members, pr, ps_pglist); 306 if (LIST_EMPTY(&savepgrp->pg_members)) 307 pgdelete(savepgrp); 308 } 309 310 /* 311 * remove process from process group 312 */ 313 void 314 leavepgrp(struct process *pr) 315 { 316 317 if (pr->ps_session->s_verauthppid == pr->ps_pid) 318 zapverauth(pr->ps_session); 319 LIST_REMOVE(pr, ps_pglist); 320 if (LIST_EMPTY(&pr->ps_pgrp->pg_members)) 321 pgdelete(pr->ps_pgrp); 322 pr->ps_pgrp = 0; 323 } 324 325 /* 326 * delete a process group 327 */ 328 void 329 pgdelete(struct pgrp *pgrp) 330 { 331 332 if (pgrp->pg_session->s_ttyp != NULL && 333 pgrp->pg_session->s_ttyp->t_pgrp == pgrp) 334 pgrp->pg_session->s_ttyp->t_pgrp = NULL; 335 LIST_REMOVE(pgrp, pg_hash); 336 SESSRELE(pgrp->pg_session); 337 pool_put(&pgrp_pool, pgrp); 338 } 339 340 void 341 zapverauth(void *v) 342 { 343 struct session *sess = v; 344 sess->s_verauthuid = 0; 345 sess->s_verauthppid = 0; 346 } 347 348 /* 349 * Adjust pgrp jobc counters when specified process changes process group. 350 * We count the number of processes in each process group that "qualify" 351 * the group for terminal job control (those with a parent in a different 352 * process group of the same session). If that count reaches zero, the 353 * process group becomes orphaned. Check both the specified process' 354 * process group and that of its children. 355 * entering == 0 => pr is leaving specified group. 356 * entering == 1 => pr is entering specified group. 357 * XXX need proctree lock 358 */ 359 void 360 fixjobc(struct process *pr, struct pgrp *pgrp, int entering) 361 { 362 struct pgrp *hispgrp; 363 struct session *mysession = pgrp->pg_session; 364 365 /* 366 * Check pr's parent to see whether pr qualifies its own process 367 * group; if so, adjust count for pr's process group. 368 */ 369 if ((hispgrp = pr->ps_pptr->ps_pgrp) != pgrp && 370 hispgrp->pg_session == mysession) { 371 if (entering) 372 pgrp->pg_jobc++; 373 else if (--pgrp->pg_jobc == 0) 374 orphanpg(pgrp); 375 } 376 377 /* 378 * Check this process' children to see whether they qualify 379 * their process groups; if so, adjust counts for children's 380 * process groups. 381 */ 382 LIST_FOREACH(pr, &pr->ps_children, ps_sibling) 383 if ((hispgrp = pr->ps_pgrp) != pgrp && 384 hispgrp->pg_session == mysession && 385 (pr->ps_flags & PS_ZOMBIE) == 0) { 386 if (entering) 387 hispgrp->pg_jobc++; 388 else if (--hispgrp->pg_jobc == 0) 389 orphanpg(hispgrp); 390 } 391 } 392 393 void 394 killjobc(struct process *pr) 395 { 396 if (SESS_LEADER(pr)) { 397 struct session *sp = pr->ps_session; 398 399 if (sp->s_ttyvp) { 400 struct vnode *ovp; 401 402 /* 403 * Controlling process. 404 * Signal foreground pgrp, 405 * drain controlling terminal 406 * and revoke access to controlling terminal. 407 */ 408 if (sp->s_ttyp->t_session == sp) { 409 if (sp->s_ttyp->t_pgrp) 410 pgsignal(sp->s_ttyp->t_pgrp, SIGHUP, 1); 411 ttywait(sp->s_ttyp); 412 /* 413 * The tty could have been revoked 414 * if we blocked. 415 */ 416 if (sp->s_ttyvp) 417 VOP_REVOKE(sp->s_ttyvp, REVOKEALL); 418 } 419 ovp = sp->s_ttyvp; 420 sp->s_ttyvp = NULL; 421 if (ovp) 422 vrele(ovp); 423 /* 424 * s_ttyp is not zero'd; we use this to 425 * indicate that the session once had a 426 * controlling terminal. (for logging and 427 * informational purposes) 428 */ 429 } 430 sp->s_leader = NULL; 431 } 432 fixjobc(pr, pr->ps_pgrp, 0); 433 } 434 435 /* 436 * A process group has become orphaned; 437 * if there are any stopped processes in the group, 438 * hang-up all process in that group. 439 */ 440 static void 441 orphanpg(struct pgrp *pg) 442 { 443 struct process *pr; 444 445 LIST_FOREACH(pr, &pg->pg_members, ps_pglist) { 446 if (pr->ps_mainproc->p_stat == SSTOP) { 447 LIST_FOREACH(pr, &pg->pg_members, ps_pglist) { 448 prsignal(pr, SIGHUP); 449 prsignal(pr, SIGCONT); 450 } 451 return; 452 } 453 } 454 } 455 456 #ifdef DDB 457 void 458 proc_printit(struct proc *p, const char *modif, 459 int (*pr)(const char *, ...) __attribute__((__format__(__kprintf__,1,2)))) 460 { 461 static const char *const pstat[] = { 462 "idle", "run", "sleep", "stop", "zombie", "dead", "onproc" 463 }; 464 char pstbuf[5]; 465 const char *pst = pstbuf; 466 467 468 if (p->p_stat < 1 || p->p_stat > sizeof(pstat) / sizeof(pstat[0])) 469 snprintf(pstbuf, sizeof(pstbuf), "%d", p->p_stat); 470 else 471 pst = pstat[(int)p->p_stat - 1]; 472 473 (*pr)("PROC (%s) pid=%d stat=%s\n", p->p_p->ps_comm, p->p_tid, pst); 474 (*pr)(" flags process=%b proc=%b\n", 475 p->p_p->ps_flags, PS_BITS, p->p_flag, P_BITS); 476 (*pr)(" pri=%u, usrpri=%u, nice=%d\n", 477 p->p_priority, p->p_usrpri, p->p_p->ps_nice); 478 (*pr)(" forw=%p, list=%p,%p\n", 479 TAILQ_NEXT(p, p_runq), p->p_list.le_next, p->p_list.le_prev); 480 (*pr)(" process=%p user=%p, vmspace=%p\n", 481 p->p_p, p->p_addr, p->p_vmspace); 482 (*pr)(" estcpu=%u, cpticks=%d, pctcpu=%u.%u\n", 483 p->p_estcpu, p->p_cpticks, p->p_pctcpu / 100, p->p_pctcpu % 100); 484 (*pr)(" user=%u, sys=%u, intr=%u\n", 485 p->p_uticks, p->p_sticks, p->p_iticks); 486 } 487 #include <machine/db_machdep.h> 488 489 #include <ddb/db_output.h> 490 491 void 492 db_kill_cmd(db_expr_t addr, int have_addr, db_expr_t count, char *modif) 493 { 494 struct process *pr; 495 struct sigaction sa; 496 struct proc *p; 497 498 pr = prfind(addr); 499 if (pr == NULL) { 500 db_printf("%ld: No such process", addr); 501 return; 502 } 503 504 p = TAILQ_FIRST(&pr->ps_threads); 505 506 /* Send uncatchable SIGABRT for coredump */ 507 memset(&sa, 0, sizeof sa); 508 sa.sa_handler = SIG_DFL; 509 setsigvec(p, SIGABRT, &sa); 510 atomic_clearbits_int(&p->p_sigmask, sigmask(SIGABRT)); 511 psignal(p, SIGABRT); 512 } 513 514 void 515 db_show_all_procs(db_expr_t addr, int haddr, db_expr_t count, char *modif) 516 { 517 char *mode; 518 int skipzomb = 0; 519 int has_kernel_lock = 0; 520 struct proc *p; 521 struct process *pr, *ppr; 522 523 if (modif[0] == 0) 524 modif[0] = 'n'; /* default == normal mode */ 525 526 mode = "mawno"; 527 while (*mode && *mode != modif[0]) 528 mode++; 529 if (*mode == 0 || *mode == 'm') { 530 db_printf("usage: show all procs [/a] [/n] [/w]\n"); 531 db_printf("\t/a == show process address info\n"); 532 db_printf("\t/n == show normal process info [default]\n"); 533 db_printf("\t/w == show process pgrp/wait info\n"); 534 db_printf("\t/o == show normal info for non-idle SONPROC\n"); 535 return; 536 } 537 538 pr = LIST_FIRST(&allprocess); 539 540 switch (*mode) { 541 542 case 'a': 543 db_printf(" TID %-9s %18s %18s %18s\n", 544 "COMMAND", "STRUCT PROC *", "UAREA *", "VMSPACE/VM_MAP"); 545 break; 546 case 'n': 547 db_printf(" PID %6s %5s %5s S %10s %-12s %-15s\n", 548 "TID", "PPID", "UID", "FLAGS", "WAIT", "COMMAND"); 549 break; 550 case 'w': 551 db_printf(" TID %-15s %-5s %18s %s\n", 552 "COMMAND", "PGRP", "WAIT-CHANNEL", "WAIT-MSG"); 553 break; 554 case 'o': 555 skipzomb = 1; 556 db_printf(" TID %5s %5s %10s %10s %3s %-30s\n", 557 "PID", "UID", "PRFLAGS", "PFLAGS", "CPU", "COMMAND"); 558 break; 559 } 560 561 while (pr != NULL) { 562 ppr = pr->ps_pptr; 563 564 TAILQ_FOREACH(p, &pr->ps_threads, p_thr_link) { 565 #ifdef MULTIPROCESSOR 566 if (__mp_lock_held(&kernel_lock, p->p_cpu)) 567 has_kernel_lock = 1; 568 else 569 has_kernel_lock = 0; 570 #endif 571 if (p->p_stat) { 572 if (*mode == 'o') { 573 if (p->p_stat != SONPROC) 574 continue; 575 if (p->p_cpu != NULL && p->p_cpu-> 576 ci_schedstate.spc_idleproc == p) 577 continue; 578 } 579 580 if (*mode == 'n') { 581 db_printf("%c%5d ", (p == curproc ? 582 '*' : ' '), pr->ps_pid); 583 } else { 584 db_printf("%c%6d ", (p == curproc ? 585 '*' : ' '), p->p_tid); 586 } 587 588 switch (*mode) { 589 590 case 'a': 591 db_printf("%-9.9s %18p %18p %18p\n", 592 pr->ps_comm, p, p->p_addr, p->p_vmspace); 593 break; 594 595 case 'n': 596 db_printf("%6d %5d %5d %d %#10x " 597 "%-12.12s %-15s\n", 598 p->p_tid, ppr ? ppr->ps_pid : -1, 599 pr->ps_ucred->cr_ruid, p->p_stat, 600 p->p_flag | pr->ps_flags, 601 (p->p_wchan && p->p_wmesg) ? 602 p->p_wmesg : "", pr->ps_comm); 603 break; 604 605 case 'w': 606 db_printf("%-15s %-5d %18p %s\n", 607 pr->ps_comm, (pr->ps_pgrp ? 608 pr->ps_pgrp->pg_id : -1), 609 p->p_wchan, 610 (p->p_wchan && p->p_wmesg) ? 611 p->p_wmesg : ""); 612 break; 613 614 case 'o': 615 db_printf("%5d %5d %#10x %#10x %3d" 616 "%c %-31s\n", 617 pr->ps_pid, pr->ps_ucred->cr_ruid, 618 pr->ps_flags, p->p_flag, 619 CPU_INFO_UNIT(p->p_cpu), 620 has_kernel_lock ? 'K' : ' ', 621 pr->ps_comm); 622 break; 623 624 } 625 } 626 } 627 pr = LIST_NEXT(pr, ps_list); 628 if (pr == NULL && skipzomb == 0) { 629 skipzomb = 1; 630 pr = LIST_FIRST(&zombprocess); 631 } 632 } 633 } 634 #endif 635 636 #ifdef DEBUG 637 void 638 pgrpdump(void) 639 { 640 struct pgrp *pgrp; 641 struct process *pr; 642 int i; 643 644 for (i = 0; i <= pgrphash; i++) { 645 if (!LIST_EMPTY(&pgrphashtbl[i])) { 646 printf("\tindx %d\n", i); 647 LIST_FOREACH(pgrp, &pgrphashtbl[i], pg_hash) { 648 printf("\tpgrp %p, pgid %d, sess %p, sesscnt %d, mem %p\n", 649 pgrp, pgrp->pg_id, pgrp->pg_session, 650 pgrp->pg_session->s_count, 651 LIST_FIRST(&pgrp->pg_members)); 652 LIST_FOREACH(pr, &pgrp->pg_members, ps_pglist) { 653 printf("\t\tpid %d addr %p pgrp %p\n", 654 pr->ps_pid, pr, pr->ps_pgrp); 655 } 656 } 657 } 658 } 659 } 660 #endif /* DEBUG */ 661