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