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 <[email protected]>
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
main(int argc,char ** argv)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
usage(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
show_process(const struct kinfo_proc * kp)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
killact(const struct kinfo_proc * kp)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
grepact(const struct kinfo_proc * kp)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
makelist(struct listhead * head,enum listtype type,char * src)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
takepid(const char * pidfile,int pidfilelock)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