1 /* $NetBSD: pkill.c,v 1.16 2005/10/10 22:13:20 kleink Exp $ */ 2 3 /*- 4 * SPDX-License-Identifier: BSD-2-Clause-NetBSD 5 * 6 * Copyright (c) 2002 The NetBSD Foundation, Inc. 7 * Copyright (c) 2005 Pawel Jakub Dawidek <pjd@FreeBSD.org> 8 * All rights reserved. 9 * 10 * This code is derived from software contributed to The NetBSD Foundation 11 * by Andrew Doran. 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 * 22 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 23 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 24 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 25 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 26 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 27 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 28 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 29 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 30 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 31 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 32 * POSSIBILITY OF SUCH DAMAGE. 33 */ 34 35 #include <sys/cdefs.h> 36 __FBSDID("$FreeBSD$"); 37 38 #include <sys/types.h> 39 #include <sys/param.h> 40 #include <sys/sysctl.h> 41 #include <sys/proc.h> 42 #include <sys/queue.h> 43 #include <sys/stat.h> 44 #include <sys/time.h> 45 #include <sys/user.h> 46 47 #include <assert.h> 48 #include <stdbool.h> 49 #include <stdio.h> 50 #include <stdlib.h> 51 #include <limits.h> 52 #include <paths.h> 53 #include <string.h> 54 #include <unistd.h> 55 #include <signal.h> 56 #include <regex.h> 57 #include <ctype.h> 58 #include <fcntl.h> 59 #include <kvm.h> 60 #include <err.h> 61 #include <pwd.h> 62 #include <grp.h> 63 #include <errno.h> 64 #include <locale.h> 65 #include <jail.h> 66 67 #define STATUS_MATCH 0 68 #define STATUS_NOMATCH 1 69 #define STATUS_BADUSAGE 2 70 #define STATUS_ERROR 3 71 72 #define MIN_PID 5 73 #define MAX_PID 99999 74 75 /* Ignore system-processes (if '-S' flag is not specified) and myself. */ 76 #define PSKIP(kp) ((kp)->ki_pid == mypid || \ 77 (!kthreads && ((kp)->ki_flag & P_KPROC) != 0)) 78 79 enum listtype { 80 LT_GENERIC, 81 LT_USER, 82 LT_GROUP, 83 LT_TTY, 84 LT_PGRP, 85 LT_JAIL, 86 LT_SID, 87 LT_CLASS 88 }; 89 90 struct list { 91 SLIST_ENTRY(list) li_chain; 92 long li_number; 93 char *li_name; 94 }; 95 96 SLIST_HEAD(listhead, list); 97 98 static struct kinfo_proc *plist; 99 static char *selected; 100 static const char *delim = "\n"; 101 static int nproc; 102 static int pgrep; 103 static int signum = SIGTERM; 104 static int newest; 105 static int oldest; 106 static int interactive; 107 static int inverse; 108 static int longfmt; 109 static int matchargs; 110 static int fullmatch; 111 static int kthreads; 112 static int cflags = REG_EXTENDED; 113 static int quiet; 114 static kvm_t *kd; 115 static pid_t mypid; 116 117 static struct listhead euidlist = SLIST_HEAD_INITIALIZER(euidlist); 118 static struct listhead ruidlist = SLIST_HEAD_INITIALIZER(ruidlist); 119 static struct listhead rgidlist = SLIST_HEAD_INITIALIZER(rgidlist); 120 static struct listhead pgrplist = SLIST_HEAD_INITIALIZER(pgrplist); 121 static struct listhead ppidlist = SLIST_HEAD_INITIALIZER(ppidlist); 122 static struct listhead tdevlist = SLIST_HEAD_INITIALIZER(tdevlist); 123 static struct listhead sidlist = SLIST_HEAD_INITIALIZER(sidlist); 124 static struct listhead jidlist = SLIST_HEAD_INITIALIZER(jidlist); 125 static struct listhead classlist = SLIST_HEAD_INITIALIZER(classlist); 126 127 static void usage(void) __attribute__((__noreturn__)); 128 static int killact(const struct kinfo_proc *); 129 static int grepact(const struct kinfo_proc *); 130 static void makelist(struct listhead *, enum listtype, char *); 131 static int takepid(const char *, int); 132 133 int 134 main(int argc, char **argv) 135 { 136 char buf[_POSIX2_LINE_MAX], *mstr, **pargv, *p, *q, *pidfile; 137 const char *execf, *coref; 138 int ancestors, debug_opt, did_action; 139 int i, ch, bestidx, rv, criteria, pidfromfile, pidfilelock; 140 size_t jsz; 141 int (*action)(const struct kinfo_proc *); 142 struct kinfo_proc *kp; 143 struct list *li; 144 struct timeval best_tval; 145 regex_t reg; 146 regmatch_t regmatch; 147 pid_t pid; 148 149 setlocale(LC_ALL, ""); 150 151 if (strcmp(getprogname(), "pgrep") == 0) { 152 action = grepact; 153 pgrep = 1; 154 } else { 155 action = killact; 156 p = argv[1]; 157 158 if (argc > 1 && p[0] == '-') { 159 p++; 160 i = (int)strtol(p, &q, 10); 161 if (*q == '\0') { 162 signum = i; 163 argv++; 164 argc--; 165 } else { 166 if (strncasecmp(p, "SIG", 3) == 0) 167 p += 3; 168 for (i = 1; i < NSIG; i++) 169 if (strcasecmp(sys_signame[i], p) == 0) 170 break; 171 if (i != NSIG) { 172 signum = i; 173 argv++; 174 argc--; 175 } 176 } 177 } 178 } 179 180 ancestors = 0; 181 criteria = 0; 182 debug_opt = 0; 183 pidfile = NULL; 184 pidfilelock = 0; 185 quiet = 0; 186 execf = NULL; 187 coref = _PATH_DEVNULL; 188 189 while ((ch = getopt(argc, argv, "DF:G:ILM:N:P:SU:ac:d:fg:ij:lnoqs:t:u:vx")) != -1) 190 switch (ch) { 191 case 'D': 192 debug_opt++; 193 break; 194 case 'F': 195 pidfile = optarg; 196 criteria = 1; 197 break; 198 case 'G': 199 makelist(&rgidlist, LT_GROUP, optarg); 200 criteria = 1; 201 break; 202 case 'I': 203 if (pgrep) 204 usage(); 205 interactive = 1; 206 break; 207 case 'L': 208 pidfilelock = 1; 209 break; 210 case 'M': 211 coref = optarg; 212 break; 213 case 'N': 214 execf = optarg; 215 break; 216 case 'P': 217 makelist(&ppidlist, LT_GENERIC, optarg); 218 criteria = 1; 219 break; 220 case 'S': 221 if (!pgrep) 222 usage(); 223 kthreads = 1; 224 break; 225 case 'U': 226 makelist(&ruidlist, LT_USER, optarg); 227 criteria = 1; 228 break; 229 case 'a': 230 ancestors++; 231 break; 232 case 'c': 233 makelist(&classlist, LT_CLASS, optarg); 234 criteria = 1; 235 break; 236 case 'd': 237 if (!pgrep) 238 usage(); 239 delim = optarg; 240 break; 241 case 'f': 242 matchargs = 1; 243 break; 244 case 'g': 245 makelist(&pgrplist, LT_PGRP, optarg); 246 criteria = 1; 247 break; 248 case 'i': 249 cflags |= REG_ICASE; 250 break; 251 case 'j': 252 makelist(&jidlist, LT_JAIL, optarg); 253 criteria = 1; 254 break; 255 case 'l': 256 longfmt = 1; 257 break; 258 case 'n': 259 newest = 1; 260 criteria = 1; 261 break; 262 case 'o': 263 oldest = 1; 264 criteria = 1; 265 break; 266 case 'q': 267 if (!pgrep) 268 usage(); 269 quiet = 1; 270 break; 271 case 's': 272 makelist(&sidlist, LT_SID, optarg); 273 criteria = 1; 274 break; 275 case 't': 276 makelist(&tdevlist, LT_TTY, optarg); 277 criteria = 1; 278 break; 279 case 'u': 280 makelist(&euidlist, LT_USER, optarg); 281 criteria = 1; 282 break; 283 case 'v': 284 inverse = 1; 285 break; 286 case 'x': 287 fullmatch = 1; 288 break; 289 default: 290 usage(); 291 /* NOTREACHED */ 292 } 293 294 argc -= optind; 295 argv += optind; 296 if (argc != 0) 297 criteria = 1; 298 if (!criteria) 299 usage(); 300 if (newest && oldest) 301 errx(STATUS_ERROR, "Options -n and -o are mutually exclusive"); 302 if (pidfile != NULL) 303 pidfromfile = takepid(pidfile, pidfilelock); 304 else { 305 if (pidfilelock) { 306 errx(STATUS_ERROR, 307 "Option -L doesn't make sense without -F"); 308 } 309 pidfromfile = -1; 310 } 311 312 mypid = getpid(); 313 314 /* 315 * Retrieve the list of running processes from the kernel. 316 */ 317 kd = kvm_openfiles(execf, coref, NULL, O_RDONLY, buf); 318 if (kd == NULL) 319 errx(STATUS_ERROR, "Cannot open kernel files (%s)", buf); 320 321 /* 322 * Use KERN_PROC_PROC instead of KERN_PROC_ALL, since we 323 * just want processes and not individual kernel threads. 324 */ 325 if (pidfromfile >= 0) 326 plist = kvm_getprocs(kd, KERN_PROC_PID, pidfromfile, &nproc); 327 else 328 plist = kvm_getprocs(kd, KERN_PROC_PROC, 0, &nproc); 329 if (plist == NULL) { 330 errx(STATUS_ERROR, "Cannot get process list (%s)", 331 kvm_geterr(kd)); 332 } 333 334 /* 335 * Allocate memory which will be used to keep track of the 336 * selection. 337 */ 338 if ((selected = malloc(nproc)) == NULL) { 339 err(STATUS_ERROR, "Cannot allocate memory for %d processes", 340 nproc); 341 } 342 memset(selected, 0, nproc); 343 344 /* 345 * Refine the selection. 346 */ 347 for (; *argv != NULL; argv++) { 348 if ((rv = regcomp(®, *argv, cflags)) != 0) { 349 regerror(rv, ®, buf, sizeof(buf)); 350 errx(STATUS_BADUSAGE, 351 "Cannot compile regular expression `%s' (%s)", 352 *argv, buf); 353 } 354 355 for (i = 0, kp = plist; i < nproc; i++, kp++) { 356 if (PSKIP(kp)) { 357 if (debug_opt > 0) 358 fprintf(stderr, "* Skipped %5d %3d %s\n", 359 kp->ki_pid, kp->ki_uid, kp->ki_comm); 360 continue; 361 } 362 363 if (matchargs && 364 (pargv = kvm_getargv(kd, kp, 0)) != NULL) { 365 jsz = 0; 366 while (jsz < sizeof(buf) && *pargv != NULL) { 367 jsz += snprintf(buf + jsz, 368 sizeof(buf) - jsz, 369 pargv[1] != NULL ? "%s " : "%s", 370 pargv[0]); 371 pargv++; 372 } 373 mstr = buf; 374 } else 375 mstr = kp->ki_comm; 376 377 rv = regexec(®, mstr, 1, ®match, 0); 378 if (rv == 0) { 379 if (fullmatch) { 380 if (regmatch.rm_so == 0 && 381 regmatch.rm_eo == 382 (off_t)strlen(mstr)) 383 selected[i] = 1; 384 } else 385 selected[i] = 1; 386 } else if (rv != REG_NOMATCH) { 387 regerror(rv, ®, buf, sizeof(buf)); 388 errx(STATUS_ERROR, 389 "Regular expression evaluation error (%s)", 390 buf); 391 } 392 if (debug_opt > 1) { 393 const char *rv_res = "NoMatch"; 394 if (selected[i]) 395 rv_res = "Matched"; 396 fprintf(stderr, "* %s %5d %3d %s\n", rv_res, 397 kp->ki_pid, kp->ki_uid, mstr); 398 } 399 } 400 401 regfree(®); 402 } 403 404 for (i = 0, kp = plist; i < nproc; i++, kp++) { 405 if (PSKIP(kp)) 406 continue; 407 408 if (pidfromfile >= 0 && kp->ki_pid != pidfromfile) { 409 selected[i] = 0; 410 continue; 411 } 412 413 SLIST_FOREACH(li, &ruidlist, li_chain) 414 if (kp->ki_ruid == (uid_t)li->li_number) 415 break; 416 if (SLIST_FIRST(&ruidlist) != NULL && li == NULL) { 417 selected[i] = 0; 418 continue; 419 } 420 421 SLIST_FOREACH(li, &rgidlist, li_chain) 422 if (kp->ki_rgid == (gid_t)li->li_number) 423 break; 424 if (SLIST_FIRST(&rgidlist) != NULL && li == NULL) { 425 selected[i] = 0; 426 continue; 427 } 428 429 SLIST_FOREACH(li, &euidlist, li_chain) 430 if (kp->ki_uid == (uid_t)li->li_number) 431 break; 432 if (SLIST_FIRST(&euidlist) != NULL && li == NULL) { 433 selected[i] = 0; 434 continue; 435 } 436 437 SLIST_FOREACH(li, &ppidlist, li_chain) 438 if (kp->ki_ppid == (pid_t)li->li_number) 439 break; 440 if (SLIST_FIRST(&ppidlist) != NULL && li == NULL) { 441 selected[i] = 0; 442 continue; 443 } 444 445 SLIST_FOREACH(li, &pgrplist, li_chain) 446 if (kp->ki_pgid == (pid_t)li->li_number) 447 break; 448 if (SLIST_FIRST(&pgrplist) != NULL && li == NULL) { 449 selected[i] = 0; 450 continue; 451 } 452 453 SLIST_FOREACH(li, &tdevlist, li_chain) { 454 if (li->li_number == -1 && 455 (kp->ki_flag & P_CONTROLT) == 0) 456 break; 457 if (kp->ki_tdev == (dev_t)li->li_number) 458 break; 459 } 460 if (SLIST_FIRST(&tdevlist) != NULL && li == NULL) { 461 selected[i] = 0; 462 continue; 463 } 464 465 SLIST_FOREACH(li, &sidlist, li_chain) 466 if (kp->ki_sid == (pid_t)li->li_number) 467 break; 468 if (SLIST_FIRST(&sidlist) != NULL && li == NULL) { 469 selected[i] = 0; 470 continue; 471 } 472 473 SLIST_FOREACH(li, &jidlist, li_chain) { 474 /* A particular jail ID, including 0 (not in jail) */ 475 if (kp->ki_jid == (int)li->li_number) 476 break; 477 /* Any jail */ 478 if (kp->ki_jid > 0 && li->li_number == -1) 479 break; 480 } 481 if (SLIST_FIRST(&jidlist) != NULL && li == NULL) { 482 selected[i] = 0; 483 continue; 484 } 485 486 SLIST_FOREACH(li, &classlist, li_chain) { 487 /* 488 * We skip P_SYSTEM processes to match ps(1) output. 489 */ 490 if ((kp->ki_flag & P_SYSTEM) == 0 && 491 strcmp(kp->ki_loginclass, li->li_name) == 0) 492 break; 493 } 494 if (SLIST_FIRST(&classlist) != NULL && li == NULL) { 495 selected[i] = 0; 496 continue; 497 } 498 499 if (argc == 0) 500 selected[i] = 1; 501 } 502 503 if (!ancestors) { 504 pid = mypid; 505 while (pid) { 506 for (i = 0, kp = plist; i < nproc; i++, kp++) { 507 if (PSKIP(kp)) 508 continue; 509 if (kp->ki_pid == pid) { 510 selected[i] = 0; 511 pid = kp->ki_ppid; 512 break; 513 } 514 } 515 if (i == nproc) { 516 if (pid == mypid) 517 pid = getppid(); 518 else 519 break; /* Maybe we're in a jail ? */ 520 } 521 } 522 } 523 524 if (newest || oldest) { 525 best_tval.tv_sec = 0; 526 best_tval.tv_usec = 0; 527 bestidx = -1; 528 529 for (i = 0, kp = plist; i < nproc; i++, kp++) { 530 if (!selected[i]) 531 continue; 532 if (bestidx == -1) { 533 /* The first entry of the list which matched. */ 534 ; 535 } else if (timercmp(&kp->ki_start, &best_tval, >)) { 536 /* This entry is newer than previous "best". */ 537 if (oldest) /* but we want the oldest */ 538 continue; 539 } else { 540 /* This entry is older than previous "best". */ 541 if (newest) /* but we want the newest */ 542 continue; 543 } 544 /* This entry is better than previous "best" entry. */ 545 best_tval.tv_sec = kp->ki_start.tv_sec; 546 best_tval.tv_usec = kp->ki_start.tv_usec; 547 bestidx = i; 548 } 549 550 memset(selected, 0, nproc); 551 if (bestidx != -1) 552 selected[bestidx] = 1; 553 } 554 555 /* 556 * Take the appropriate action for each matched process, if any. 557 */ 558 did_action = 0; 559 for (i = 0, rv = 0, kp = plist; i < nproc; i++, kp++) { 560 if (PSKIP(kp)) 561 continue; 562 if (selected[i]) { 563 if (longfmt && !pgrep) { 564 did_action = 1; 565 printf("kill -%d %d\n", signum, kp->ki_pid); 566 } 567 if (inverse) 568 continue; 569 } else if (!inverse) 570 continue; 571 rv |= (*action)(kp); 572 } 573 if (rv && pgrep && !quiet) 574 putchar('\n'); 575 if (!did_action && !pgrep && longfmt) 576 fprintf(stderr, 577 "No matching processes belonging to you were found\n"); 578 579 exit(rv ? STATUS_MATCH : STATUS_NOMATCH); 580 } 581 582 static void 583 usage(void) 584 { 585 const char *ustr; 586 587 if (pgrep) 588 ustr = "[-LSfilnoqvx] [-d delim]"; 589 else 590 ustr = "[-signal] [-ILfilnovx]"; 591 592 fprintf(stderr, 593 "usage: %s %s [-F pidfile] [-G gid] [-M core] [-N system]\n" 594 " [-P ppid] [-U uid] [-c class] [-g pgrp] [-j jail]\n" 595 " [-s sid] [-t tty] [-u euid] pattern ...\n", 596 getprogname(), ustr); 597 598 exit(STATUS_BADUSAGE); 599 } 600 601 static void 602 show_process(const struct kinfo_proc *kp) 603 { 604 char **argv; 605 606 if (quiet) { 607 assert(pgrep); 608 return; 609 } 610 if ((longfmt || !pgrep) && matchargs && 611 (argv = kvm_getargv(kd, kp, 0)) != NULL) { 612 printf("%d ", (int)kp->ki_pid); 613 for (; *argv != NULL; argv++) { 614 printf("%s", *argv); 615 if (argv[1] != NULL) 616 putchar(' '); 617 } 618 } else if (longfmt || !pgrep) 619 printf("%d %s", (int)kp->ki_pid, kp->ki_comm); 620 else 621 printf("%d", (int)kp->ki_pid); 622 } 623 624 static int 625 killact(const struct kinfo_proc *kp) 626 { 627 int ch, first; 628 629 if (interactive) { 630 /* 631 * Be careful, ask before killing. 632 */ 633 printf("kill "); 634 show_process(kp); 635 printf("? "); 636 fflush(stdout); 637 first = ch = getchar(); 638 while (ch != '\n' && ch != EOF) 639 ch = getchar(); 640 if (first != 'y' && first != 'Y') 641 return (1); 642 } 643 if (kill(kp->ki_pid, signum) == -1) { 644 /* 645 * Check for ESRCH, which indicates that the process 646 * disappeared between us matching it and us 647 * signalling it; don't issue a warning about it. 648 */ 649 if (errno != ESRCH) 650 warn("signalling pid %d", (int)kp->ki_pid); 651 /* 652 * Return 0 to indicate that the process should not be 653 * considered a match, since we didn't actually get to 654 * signal it. 655 */ 656 return (0); 657 } 658 return (1); 659 } 660 661 static int 662 grepact(const struct kinfo_proc *kp) 663 { 664 static bool first = true; 665 666 if (!quiet && !first) 667 printf("%s", delim); 668 show_process(kp); 669 first = false; 670 return (1); 671 } 672 673 static void 674 makelist(struct listhead *head, enum listtype type, char *src) 675 { 676 struct list *li; 677 struct passwd *pw; 678 struct group *gr; 679 struct stat st; 680 const char *cp; 681 char *sp, *ep, buf[MAXPATHLEN]; 682 int empty; 683 684 empty = 1; 685 686 while ((sp = strsep(&src, ",")) != NULL) { 687 if (*sp == '\0') 688 usage(); 689 690 if ((li = malloc(sizeof(*li))) == NULL) { 691 err(STATUS_ERROR, "Cannot allocate %zu bytes", 692 sizeof(*li)); 693 } 694 695 SLIST_INSERT_HEAD(head, li, li_chain); 696 empty = 0; 697 698 if (type != LT_CLASS) 699 li->li_number = (uid_t)strtol(sp, &ep, 0); 700 701 if (type != LT_CLASS && *ep == '\0') { 702 switch (type) { 703 case LT_PGRP: 704 if (li->li_number == 0) 705 li->li_number = getpgrp(); 706 break; 707 case LT_SID: 708 if (li->li_number == 0) 709 li->li_number = getsid(mypid); 710 break; 711 case LT_JAIL: 712 if (li->li_number < 0) 713 errx(STATUS_BADUSAGE, 714 "Negative jail ID `%s'", sp); 715 /* For compatibility with old -j */ 716 if (li->li_number == 0) 717 li->li_number = -1; /* any jail */ 718 break; 719 case LT_TTY: 720 if (li->li_number < 0) 721 errx(STATUS_BADUSAGE, 722 "Negative /dev/pts tty `%s'", sp); 723 snprintf(buf, sizeof(buf), _PATH_DEV "pts/%s", 724 sp); 725 if (stat(buf, &st) != -1) 726 goto foundtty; 727 if (errno == ENOENT) 728 errx(STATUS_BADUSAGE, "No such tty: `" 729 _PATH_DEV "pts/%s'", sp); 730 err(STATUS_ERROR, "Cannot access `" 731 _PATH_DEV "pts/%s'", sp); 732 break; 733 default: 734 break; 735 } 736 continue; 737 } 738 739 switch (type) { 740 case LT_USER: 741 if ((pw = getpwnam(sp)) == NULL) 742 errx(STATUS_BADUSAGE, "Unknown user `%s'", sp); 743 li->li_number = pw->pw_uid; 744 break; 745 case LT_GROUP: 746 if ((gr = getgrnam(sp)) == NULL) 747 errx(STATUS_BADUSAGE, "Unknown group `%s'", sp); 748 li->li_number = gr->gr_gid; 749 break; 750 case LT_TTY: 751 if (strcmp(sp, "-") == 0) { 752 li->li_number = -1; 753 break; 754 } else if (strcmp(sp, "co") == 0) { 755 cp = "console"; 756 } else { 757 cp = sp; 758 } 759 760 snprintf(buf, sizeof(buf), _PATH_DEV "%s", cp); 761 if (stat(buf, &st) != -1) 762 goto foundtty; 763 764 snprintf(buf, sizeof(buf), _PATH_DEV "tty%s", cp); 765 if (stat(buf, &st) != -1) 766 goto foundtty; 767 768 if (errno == ENOENT) 769 errx(STATUS_BADUSAGE, "No such tty: `%s'", sp); 770 err(STATUS_ERROR, "Cannot access `%s'", sp); 771 772 foundtty: if ((st.st_mode & S_IFCHR) == 0) 773 errx(STATUS_BADUSAGE, "Not a tty: `%s'", sp); 774 775 li->li_number = st.st_rdev; 776 break; 777 case LT_JAIL: { 778 int jid; 779 780 if (strcmp(sp, "none") == 0) 781 li->li_number = 0; 782 else if (strcmp(sp, "any") == 0) 783 li->li_number = -1; 784 else if ((jid = jail_getid(sp)) != -1) 785 li->li_number = jid; 786 else if (*ep != '\0') 787 errx(STATUS_BADUSAGE, 788 "Invalid jail ID or name `%s'", sp); 789 break; 790 } 791 case LT_CLASS: 792 li->li_number = -1; 793 li->li_name = strdup(sp); 794 if (li->li_name == NULL) 795 err(STATUS_ERROR, "Cannot allocate memory"); 796 break; 797 default: 798 usage(); 799 } 800 } 801 802 if (empty) 803 usage(); 804 } 805 806 static int 807 takepid(const char *pidfile, int pidfilelock) 808 { 809 char *endp, line[BUFSIZ]; 810 FILE *fh; 811 long rval; 812 813 fh = fopen(pidfile, "r"); 814 if (fh == NULL) 815 err(STATUS_ERROR, "Cannot open pidfile `%s'", pidfile); 816 817 if (pidfilelock) { 818 /* 819 * If we can lock pidfile, this means that daemon is not 820 * running, so would be better not to kill some random process. 821 */ 822 if (flock(fileno(fh), LOCK_EX | LOCK_NB) == 0) { 823 (void)fclose(fh); 824 errx(STATUS_ERROR, "File '%s' can be locked", pidfile); 825 } else { 826 if (errno != EWOULDBLOCK) { 827 errx(STATUS_ERROR, 828 "Error while locking file '%s'", pidfile); 829 } 830 } 831 } 832 833 if (fgets(line, sizeof(line), fh) == NULL) { 834 if (feof(fh)) { 835 (void)fclose(fh); 836 errx(STATUS_ERROR, "Pidfile `%s' is empty", pidfile); 837 } 838 (void)fclose(fh); 839 err(STATUS_ERROR, "Cannot read from pid file `%s'", pidfile); 840 } 841 (void)fclose(fh); 842 843 rval = strtol(line, &endp, 10); 844 if (*endp != '\0' && !isspace((unsigned char)*endp)) 845 errx(STATUS_ERROR, "Invalid pid in file `%s'", pidfile); 846 else if (rval < MIN_PID || rval > MAX_PID) 847 errx(STATUS_ERROR, "Invalid pid in file `%s'", pidfile); 848 return (rval); 849 } 850