1 /* $NetBSD: pkill.c,v 1.16 2005/10/10 22:13:20 kleink Exp $ */ 2 3 /*- 4 * Copyright (c) 2002 The NetBSD Foundation, Inc. 5 * Copyright (c) 2005 Pawel Jakub Dawidek <pjd@FreeBSD.org> 6 * All rights reserved. 7 * 8 * This code is derived from software contributed to The NetBSD Foundation 9 * by Andrew Doran. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 30 * POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 #include <sys/cdefs.h> 34 __FBSDID("$FreeBSD$"); 35 36 #include <sys/types.h> 37 #include <sys/param.h> 38 #include <sys/sysctl.h> 39 #include <sys/proc.h> 40 #include <sys/queue.h> 41 #include <sys/stat.h> 42 #include <sys/time.h> 43 #include <sys/user.h> 44 45 #include <assert.h> 46 #include <stdbool.h> 47 #include <stdio.h> 48 #include <stdlib.h> 49 #include <limits.h> 50 #include <paths.h> 51 #include <string.h> 52 #include <unistd.h> 53 #include <signal.h> 54 #include <regex.h> 55 #include <ctype.h> 56 #include <fcntl.h> 57 #include <kvm.h> 58 #include <err.h> 59 #include <pwd.h> 60 #include <grp.h> 61 #include <errno.h> 62 #include <locale.h> 63 #include <jail.h> 64 65 #define STATUS_MATCH 0 66 #define STATUS_NOMATCH 1 67 #define STATUS_BADUSAGE 2 68 #define STATUS_ERROR 3 69 70 #define MIN_PID 5 71 #define MAX_PID 99999 72 73 /* Ignore system-processes (if '-S' flag is not specified) and myself. */ 74 #define PSKIP(kp) ((kp)->ki_pid == mypid || \ 75 (!kthreads && ((kp)->ki_flag & P_KPROC) != 0)) 76 77 enum listtype { 78 LT_GENERIC, 79 LT_USER, 80 LT_GROUP, 81 LT_TTY, 82 LT_PGRP, 83 LT_JAIL, 84 LT_SID, 85 LT_CLASS 86 }; 87 88 struct list { 89 SLIST_ENTRY(list) li_chain; 90 long li_number; 91 char *li_name; 92 }; 93 94 SLIST_HEAD(listhead, list); 95 96 static struct kinfo_proc *plist; 97 static char *selected; 98 static const char *delim = "\n"; 99 static int nproc; 100 static int pgrep; 101 static int signum = SIGTERM; 102 static int newest; 103 static int oldest; 104 static int interactive; 105 static int inverse; 106 static int longfmt; 107 static int matchargs; 108 static int fullmatch; 109 static int kthreads; 110 static int cflags = REG_EXTENDED; 111 static int quiet; 112 static kvm_t *kd; 113 static pid_t mypid; 114 115 static struct listhead euidlist = SLIST_HEAD_INITIALIZER(euidlist); 116 static struct listhead ruidlist = SLIST_HEAD_INITIALIZER(ruidlist); 117 static struct listhead rgidlist = SLIST_HEAD_INITIALIZER(rgidlist); 118 static struct listhead pgrplist = SLIST_HEAD_INITIALIZER(pgrplist); 119 static struct listhead ppidlist = SLIST_HEAD_INITIALIZER(ppidlist); 120 static struct listhead tdevlist = SLIST_HEAD_INITIALIZER(tdevlist); 121 static struct listhead sidlist = SLIST_HEAD_INITIALIZER(sidlist); 122 static struct listhead jidlist = SLIST_HEAD_INITIALIZER(jidlist); 123 static struct listhead classlist = SLIST_HEAD_INITIALIZER(classlist); 124 125 static void usage(void) __attribute__((__noreturn__)); 126 static int killact(const struct kinfo_proc *); 127 static int grepact(const struct kinfo_proc *); 128 static void makelist(struct listhead *, enum listtype, char *); 129 static int takepid(const char *, int); 130 131 int 132 main(int argc, char **argv) 133 { 134 char buf[_POSIX2_LINE_MAX], *mstr, **pargv, *p, *q, *pidfile; 135 const char *execf, *coref; 136 int ancestors, debug_opt, did_action; 137 int i, ch, bestidx, rv, criteria, pidfromfile, pidfilelock; 138 size_t jsz; 139 int (*action)(const struct kinfo_proc *); 140 struct kinfo_proc *kp; 141 struct list *li; 142 struct timeval best_tval; 143 regex_t reg; 144 regmatch_t regmatch; 145 pid_t pid; 146 147 setlocale(LC_ALL, ""); 148 149 if (strcmp(getprogname(), "pgrep") == 0) { 150 action = grepact; 151 pgrep = 1; 152 } else { 153 action = killact; 154 p = argv[1]; 155 156 if (argc > 1 && p[0] == '-') { 157 p++; 158 i = (int)strtol(p, &q, 10); 159 if (*q == '\0') { 160 signum = i; 161 argv++; 162 argc--; 163 } else { 164 if (strncasecmp(p, "SIG", 3) == 0) 165 p += 3; 166 for (i = 1; i < NSIG; i++) 167 if (strcasecmp(sys_signame[i], p) == 0) 168 break; 169 if (i != NSIG) { 170 signum = i; 171 argv++; 172 argc--; 173 } 174 } 175 } 176 } 177 178 ancestors = 0; 179 criteria = 0; 180 debug_opt = 0; 181 pidfile = NULL; 182 pidfilelock = 0; 183 quiet = 0; 184 execf = NULL; 185 coref = _PATH_DEVNULL; 186 187 while ((ch = getopt(argc, argv, "DF:G:ILM:N:P:SU:ac:d:fg:ij:lnoqs:t:u:vx")) != -1) 188 switch (ch) { 189 case 'D': 190 debug_opt++; 191 break; 192 case 'F': 193 pidfile = optarg; 194 criteria = 1; 195 break; 196 case 'G': 197 makelist(&rgidlist, LT_GROUP, optarg); 198 criteria = 1; 199 break; 200 case 'I': 201 if (pgrep) 202 usage(); 203 interactive = 1; 204 break; 205 case 'L': 206 pidfilelock = 1; 207 break; 208 case 'M': 209 coref = optarg; 210 break; 211 case 'N': 212 execf = optarg; 213 break; 214 case 'P': 215 makelist(&ppidlist, LT_GENERIC, optarg); 216 criteria = 1; 217 break; 218 case 'S': 219 if (!pgrep) 220 usage(); 221 kthreads = 1; 222 break; 223 case 'U': 224 makelist(&ruidlist, LT_USER, optarg); 225 criteria = 1; 226 break; 227 case 'a': 228 ancestors++; 229 break; 230 case 'c': 231 makelist(&classlist, LT_CLASS, optarg); 232 criteria = 1; 233 break; 234 case 'd': 235 if (!pgrep) 236 usage(); 237 delim = optarg; 238 break; 239 case 'f': 240 matchargs = 1; 241 break; 242 case 'g': 243 makelist(&pgrplist, LT_PGRP, optarg); 244 criteria = 1; 245 break; 246 case 'i': 247 cflags |= REG_ICASE; 248 break; 249 case 'j': 250 makelist(&jidlist, LT_JAIL, optarg); 251 criteria = 1; 252 break; 253 case 'l': 254 longfmt = 1; 255 break; 256 case 'n': 257 newest = 1; 258 criteria = 1; 259 break; 260 case 'o': 261 oldest = 1; 262 criteria = 1; 263 break; 264 case 'q': 265 if (!pgrep) 266 usage(); 267 quiet = 1; 268 break; 269 case 's': 270 makelist(&sidlist, LT_SID, optarg); 271 criteria = 1; 272 break; 273 case 't': 274 makelist(&tdevlist, LT_TTY, optarg); 275 criteria = 1; 276 break; 277 case 'u': 278 makelist(&euidlist, LT_USER, optarg); 279 criteria = 1; 280 break; 281 case 'v': 282 inverse = 1; 283 break; 284 case 'x': 285 fullmatch = 1; 286 break; 287 default: 288 usage(); 289 /* NOTREACHED */ 290 } 291 292 argc -= optind; 293 argv += optind; 294 if (argc != 0) 295 criteria = 1; 296 if (!criteria) 297 usage(); 298 if (newest && oldest) 299 errx(STATUS_ERROR, "Options -n and -o are mutually exclusive"); 300 if (pidfile != NULL) 301 pidfromfile = takepid(pidfile, pidfilelock); 302 else { 303 if (pidfilelock) { 304 errx(STATUS_ERROR, 305 "Option -L doesn't make sense without -F"); 306 } 307 pidfromfile = -1; 308 } 309 310 mypid = getpid(); 311 312 /* 313 * Retrieve the list of running processes from the kernel. 314 */ 315 kd = kvm_openfiles(execf, coref, NULL, O_RDONLY, buf); 316 if (kd == NULL) 317 errx(STATUS_ERROR, "Cannot open kernel files (%s)", buf); 318 319 /* 320 * Use KERN_PROC_PROC instead of KERN_PROC_ALL, since we 321 * just want processes and not individual kernel threads. 322 */ 323 if (pidfromfile >= 0) 324 plist = kvm_getprocs(kd, KERN_PROC_PID, pidfromfile, &nproc); 325 else 326 plist = kvm_getprocs(kd, KERN_PROC_PROC, 0, &nproc); 327 if (plist == NULL) { 328 errx(STATUS_ERROR, "Cannot get process list (%s)", 329 kvm_geterr(kd)); 330 } 331 332 /* 333 * Allocate memory which will be used to keep track of the 334 * selection. 335 */ 336 if ((selected = malloc(nproc)) == NULL) { 337 err(STATUS_ERROR, "Cannot allocate memory for %d processes", 338 nproc); 339 } 340 memset(selected, 0, nproc); 341 342 /* 343 * Refine the selection. 344 */ 345 for (; *argv != NULL; argv++) { 346 if ((rv = regcomp(®, *argv, cflags)) != 0) { 347 regerror(rv, ®, buf, sizeof(buf)); 348 errx(STATUS_BADUSAGE, 349 "Cannot compile regular expression `%s' (%s)", 350 *argv, buf); 351 } 352 353 for (i = 0, kp = plist; i < nproc; i++, kp++) { 354 if (PSKIP(kp)) { 355 if (debug_opt > 0) 356 fprintf(stderr, "* Skipped %5d %3d %s\n", 357 kp->ki_pid, kp->ki_uid, kp->ki_comm); 358 continue; 359 } 360 361 if (matchargs && 362 (pargv = kvm_getargv(kd, kp, 0)) != NULL) { 363 jsz = 0; 364 while (jsz < sizeof(buf) && *pargv != NULL) { 365 jsz += snprintf(buf + jsz, 366 sizeof(buf) - jsz, 367 pargv[1] != NULL ? "%s " : "%s", 368 pargv[0]); 369 pargv++; 370 } 371 mstr = buf; 372 } else 373 mstr = kp->ki_comm; 374 375 rv = regexec(®, mstr, 1, ®match, 0); 376 if (rv == 0) { 377 if (fullmatch) { 378 if (regmatch.rm_so == 0 && 379 regmatch.rm_eo == 380 (off_t)strlen(mstr)) 381 selected[i] = 1; 382 } else 383 selected[i] = 1; 384 } else if (rv != REG_NOMATCH) { 385 regerror(rv, ®, buf, sizeof(buf)); 386 errx(STATUS_ERROR, 387 "Regular expression evaluation error (%s)", 388 buf); 389 } 390 if (debug_opt > 1) { 391 const char *rv_res = "NoMatch"; 392 if (selected[i]) 393 rv_res = "Matched"; 394 fprintf(stderr, "* %s %5d %3d %s\n", rv_res, 395 kp->ki_pid, kp->ki_uid, mstr); 396 } 397 } 398 399 regfree(®); 400 } 401 402 for (i = 0, kp = plist; i < nproc; i++, kp++) { 403 if (PSKIP(kp)) 404 continue; 405 406 if (pidfromfile >= 0 && kp->ki_pid != pidfromfile) { 407 selected[i] = 0; 408 continue; 409 } 410 411 SLIST_FOREACH(li, &ruidlist, li_chain) 412 if (kp->ki_ruid == (uid_t)li->li_number) 413 break; 414 if (SLIST_FIRST(&ruidlist) != NULL && li == NULL) { 415 selected[i] = 0; 416 continue; 417 } 418 419 SLIST_FOREACH(li, &rgidlist, li_chain) 420 if (kp->ki_rgid == (gid_t)li->li_number) 421 break; 422 if (SLIST_FIRST(&rgidlist) != NULL && li == NULL) { 423 selected[i] = 0; 424 continue; 425 } 426 427 SLIST_FOREACH(li, &euidlist, li_chain) 428 if (kp->ki_uid == (uid_t)li->li_number) 429 break; 430 if (SLIST_FIRST(&euidlist) != NULL && li == NULL) { 431 selected[i] = 0; 432 continue; 433 } 434 435 SLIST_FOREACH(li, &ppidlist, li_chain) 436 if (kp->ki_ppid == (pid_t)li->li_number) 437 break; 438 if (SLIST_FIRST(&ppidlist) != NULL && li == NULL) { 439 selected[i] = 0; 440 continue; 441 } 442 443 SLIST_FOREACH(li, &pgrplist, li_chain) 444 if (kp->ki_pgid == (pid_t)li->li_number) 445 break; 446 if (SLIST_FIRST(&pgrplist) != NULL && li == NULL) { 447 selected[i] = 0; 448 continue; 449 } 450 451 SLIST_FOREACH(li, &tdevlist, li_chain) { 452 if (li->li_number == -1 && 453 (kp->ki_flag & P_CONTROLT) == 0) 454 break; 455 if (kp->ki_tdev == (dev_t)li->li_number) 456 break; 457 } 458 if (SLIST_FIRST(&tdevlist) != NULL && li == NULL) { 459 selected[i] = 0; 460 continue; 461 } 462 463 SLIST_FOREACH(li, &sidlist, li_chain) 464 if (kp->ki_sid == (pid_t)li->li_number) 465 break; 466 if (SLIST_FIRST(&sidlist) != NULL && li == NULL) { 467 selected[i] = 0; 468 continue; 469 } 470 471 SLIST_FOREACH(li, &jidlist, li_chain) { 472 /* A particular jail ID, including 0 (not in jail) */ 473 if (kp->ki_jid == (int)li->li_number) 474 break; 475 /* Any jail */ 476 if (kp->ki_jid > 0 && li->li_number == -1) 477 break; 478 } 479 if (SLIST_FIRST(&jidlist) != NULL && li == NULL) { 480 selected[i] = 0; 481 continue; 482 } 483 484 SLIST_FOREACH(li, &classlist, li_chain) { 485 /* 486 * We skip P_SYSTEM processes to match ps(1) output. 487 */ 488 if ((kp->ki_flag & P_SYSTEM) == 0 && 489 strcmp(kp->ki_loginclass, li->li_name) == 0) 490 break; 491 } 492 if (SLIST_FIRST(&classlist) != NULL && li == NULL) { 493 selected[i] = 0; 494 continue; 495 } 496 497 if (argc == 0) 498 selected[i] = 1; 499 } 500 501 if (!ancestors) { 502 pid = mypid; 503 while (pid) { 504 for (i = 0, kp = plist; i < nproc; i++, kp++) { 505 if (PSKIP(kp)) 506 continue; 507 if (kp->ki_pid == pid) { 508 selected[i] = 0; 509 pid = kp->ki_ppid; 510 break; 511 } 512 } 513 if (i == nproc) { 514 if (pid == mypid) 515 pid = getppid(); 516 else 517 break; /* Maybe we're in a jail ? */ 518 } 519 } 520 } 521 522 if (newest || oldest) { 523 best_tval.tv_sec = 0; 524 best_tval.tv_usec = 0; 525 bestidx = -1; 526 527 for (i = 0, kp = plist; i < nproc; i++, kp++) { 528 if (!selected[i]) 529 continue; 530 if (bestidx == -1) { 531 /* The first entry of the list which matched. */ 532 ; 533 } else if (timercmp(&kp->ki_start, &best_tval, >)) { 534 /* This entry is newer than previous "best". */ 535 if (oldest) /* but we want the oldest */ 536 continue; 537 } else { 538 /* This entry is older than previous "best". */ 539 if (newest) /* but we want the newest */ 540 continue; 541 } 542 /* This entry is better than previous "best" entry. */ 543 best_tval.tv_sec = kp->ki_start.tv_sec; 544 best_tval.tv_usec = kp->ki_start.tv_usec; 545 bestidx = i; 546 } 547 548 memset(selected, 0, nproc); 549 if (bestidx != -1) 550 selected[bestidx] = 1; 551 } 552 553 /* 554 * Take the appropriate action for each matched process, if any. 555 */ 556 did_action = 0; 557 for (i = 0, rv = 0, kp = plist; i < nproc; i++, kp++) { 558 if (PSKIP(kp)) 559 continue; 560 if (selected[i]) { 561 if (longfmt && !pgrep) { 562 did_action = 1; 563 printf("kill -%d %d\n", signum, kp->ki_pid); 564 } 565 if (inverse) 566 continue; 567 } else if (!inverse) 568 continue; 569 rv |= (*action)(kp); 570 } 571 if (rv && pgrep) 572 putchar('\n'); 573 if (!did_action && !pgrep && longfmt) 574 fprintf(stderr, 575 "No matching processes belonging to you were found\n"); 576 577 exit(rv ? STATUS_MATCH : STATUS_NOMATCH); 578 } 579 580 static void 581 usage(void) 582 { 583 const char *ustr; 584 585 if (pgrep) 586 ustr = "[-LSfilnoqvx] [-d delim]"; 587 else 588 ustr = "[-signal] [-ILfilnovx]"; 589 590 fprintf(stderr, 591 "usage: %s %s [-F pidfile] [-G gid] [-M core] [-N system]\n" 592 " [-P ppid] [-U uid] [-c class] [-g pgrp] [-j jail]\n" 593 " [-s sid] [-t tty] [-u euid] pattern ...\n", 594 getprogname(), ustr); 595 596 exit(STATUS_BADUSAGE); 597 } 598 599 static void 600 show_process(const struct kinfo_proc *kp) 601 { 602 char **argv; 603 604 if (quiet) { 605 assert(pgrep); 606 return; 607 } 608 if ((longfmt || !pgrep) && matchargs && 609 (argv = kvm_getargv(kd, kp, 0)) != NULL) { 610 printf("%d ", (int)kp->ki_pid); 611 for (; *argv != NULL; argv++) { 612 printf("%s", *argv); 613 if (argv[1] != NULL) 614 putchar(' '); 615 } 616 } else if (longfmt || !pgrep) 617 printf("%d %s", (int)kp->ki_pid, kp->ki_comm); 618 else 619 printf("%d", (int)kp->ki_pid); 620 } 621 622 static int 623 killact(const struct kinfo_proc *kp) 624 { 625 int ch, first; 626 627 if (interactive) { 628 /* 629 * Be careful, ask before killing. 630 */ 631 printf("kill "); 632 show_process(kp); 633 printf("? "); 634 fflush(stdout); 635 first = ch = getchar(); 636 while (ch != '\n' && ch != EOF) 637 ch = getchar(); 638 if (first != 'y' && first != 'Y') 639 return (1); 640 } 641 if (kill(kp->ki_pid, signum) == -1) { 642 /* 643 * Check for ESRCH, which indicates that the process 644 * disappeared between us matching it and us 645 * signalling it; don't issue a warning about it. 646 */ 647 if (errno != ESRCH) 648 warn("signalling pid %d", (int)kp->ki_pid); 649 /* 650 * Return 0 to indicate that the process should not be 651 * considered a match, since we didn't actually get to 652 * signal it. 653 */ 654 return (0); 655 } 656 return (1); 657 } 658 659 static int 660 grepact(const struct kinfo_proc *kp) 661 { 662 static bool first = true; 663 664 if (!quiet && !first) 665 printf("%s", delim); 666 show_process(kp); 667 first = false; 668 return (1); 669 } 670 671 static void 672 makelist(struct listhead *head, enum listtype type, char *src) 673 { 674 struct list *li; 675 struct passwd *pw; 676 struct group *gr; 677 struct stat st; 678 const char *cp; 679 char *sp, *ep, buf[MAXPATHLEN]; 680 int empty; 681 682 empty = 1; 683 684 while ((sp = strsep(&src, ",")) != NULL) { 685 if (*sp == '\0') 686 usage(); 687 688 if ((li = malloc(sizeof(*li))) == NULL) { 689 err(STATUS_ERROR, "Cannot allocate %zu bytes", 690 sizeof(*li)); 691 } 692 693 SLIST_INSERT_HEAD(head, li, li_chain); 694 empty = 0; 695 696 if (type != LT_CLASS) 697 li->li_number = (uid_t)strtol(sp, &ep, 0); 698 699 if (type != LT_CLASS && *ep == '\0') { 700 switch (type) { 701 case LT_PGRP: 702 if (li->li_number == 0) 703 li->li_number = getpgrp(); 704 break; 705 case LT_SID: 706 if (li->li_number == 0) 707 li->li_number = getsid(mypid); 708 break; 709 case LT_JAIL: 710 if (li->li_number < 0) 711 errx(STATUS_BADUSAGE, 712 "Negative jail ID `%s'", sp); 713 /* For compatibility with old -j */ 714 if (li->li_number == 0) 715 li->li_number = -1; /* any jail */ 716 break; 717 case LT_TTY: 718 if (li->li_number < 0) 719 errx(STATUS_BADUSAGE, 720 "Negative /dev/pts tty `%s'", sp); 721 snprintf(buf, sizeof(buf), _PATH_DEV "pts/%s", 722 sp); 723 if (stat(buf, &st) != -1) 724 goto foundtty; 725 if (errno == ENOENT) 726 errx(STATUS_BADUSAGE, "No such tty: `" 727 _PATH_DEV "pts/%s'", sp); 728 err(STATUS_ERROR, "Cannot access `" 729 _PATH_DEV "pts/%s'", sp); 730 break; 731 default: 732 break; 733 } 734 continue; 735 } 736 737 switch (type) { 738 case LT_USER: 739 if ((pw = getpwnam(sp)) == NULL) 740 errx(STATUS_BADUSAGE, "Unknown user `%s'", sp); 741 li->li_number = pw->pw_uid; 742 break; 743 case LT_GROUP: 744 if ((gr = getgrnam(sp)) == NULL) 745 errx(STATUS_BADUSAGE, "Unknown group `%s'", sp); 746 li->li_number = gr->gr_gid; 747 break; 748 case LT_TTY: 749 if (strcmp(sp, "-") == 0) { 750 li->li_number = -1; 751 break; 752 } else if (strcmp(sp, "co") == 0) { 753 cp = "console"; 754 } else { 755 cp = sp; 756 } 757 758 snprintf(buf, sizeof(buf), _PATH_DEV "%s", cp); 759 if (stat(buf, &st) != -1) 760 goto foundtty; 761 762 snprintf(buf, sizeof(buf), _PATH_DEV "tty%s", cp); 763 if (stat(buf, &st) != -1) 764 goto foundtty; 765 766 if (errno == ENOENT) 767 errx(STATUS_BADUSAGE, "No such tty: `%s'", sp); 768 err(STATUS_ERROR, "Cannot access `%s'", sp); 769 770 foundtty: if ((st.st_mode & S_IFCHR) == 0) 771 errx(STATUS_BADUSAGE, "Not a tty: `%s'", sp); 772 773 li->li_number = st.st_rdev; 774 break; 775 case LT_JAIL: { 776 int jid; 777 778 if (strcmp(sp, "none") == 0) 779 li->li_number = 0; 780 else if (strcmp(sp, "any") == 0) 781 li->li_number = -1; 782 else if ((jid = jail_getid(sp)) != -1) 783 li->li_number = jid; 784 else if (*ep != '\0') 785 errx(STATUS_BADUSAGE, 786 "Invalid jail ID or name `%s'", sp); 787 break; 788 } 789 case LT_CLASS: 790 li->li_number = -1; 791 li->li_name = strdup(sp); 792 if (li->li_name == NULL) 793 err(STATUS_ERROR, "Cannot allocate memory"); 794 break; 795 default: 796 usage(); 797 } 798 } 799 800 if (empty) 801 usage(); 802 } 803 804 static int 805 takepid(const char *pidfile, int pidfilelock) 806 { 807 char *endp, line[BUFSIZ]; 808 FILE *fh; 809 long rval; 810 811 fh = fopen(pidfile, "r"); 812 if (fh == NULL) 813 err(STATUS_ERROR, "Cannot open pidfile `%s'", pidfile); 814 815 if (pidfilelock) { 816 /* 817 * If we can lock pidfile, this means that daemon is not 818 * running, so would be better not to kill some random process. 819 */ 820 if (flock(fileno(fh), LOCK_EX | LOCK_NB) == 0) { 821 (void)fclose(fh); 822 errx(STATUS_ERROR, "File '%s' can be locked", pidfile); 823 } else { 824 if (errno != EWOULDBLOCK) { 825 errx(STATUS_ERROR, 826 "Error while locking file '%s'", pidfile); 827 } 828 } 829 } 830 831 if (fgets(line, sizeof(line), fh) == NULL) { 832 if (feof(fh)) { 833 (void)fclose(fh); 834 errx(STATUS_ERROR, "Pidfile `%s' is empty", pidfile); 835 } 836 (void)fclose(fh); 837 err(STATUS_ERROR, "Cannot read from pid file `%s'", pidfile); 838 } 839 (void)fclose(fh); 840 841 rval = strtol(line, &endp, 10); 842 if (*endp != '\0' && !isspace((unsigned char)*endp)) 843 errx(STATUS_ERROR, "Invalid pid in file `%s'", pidfile); 844 else if (rval < MIN_PID || rval > MAX_PID) 845 errx(STATUS_ERROR, "Invalid pid in file `%s'", pidfile); 846 return (rval); 847 } 848