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