1/*	$OpenBSD: kill.c,v 1.14 2017/03/29 22:40:15 millert Exp $	*/
2/*	$NetBSD: kill.c,v 1.11 1995/09/07 06:30:27 jtc Exp $	*/
3
4/*
5 * Copyright (c) 1988, 1993, 1994
6 *	The Regents of the University of California.  All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the University nor the names of its contributors
17 *    may be used to endorse or promote products derived from this software
18 *    without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33#include <ctype.h>
34#include <err.h>
35#include <errno.h>
36#include <limits.h>
37#include <signal.h>
38#include <stdio.h>
39#include <stdlib.h>
40#include <string.h>
41#include <unistd.h>
42
43extern	char *__progname;
44
45void nosig(char *);
46void printsignals(FILE *);
47int signame_to_signum(char *);
48void usage(void);
49
50int
51main(int argc, char *argv[])
52{
53	int errors, numsig, pid;
54	const char *errstr;
55
56	if (pledge("stdio proc", NULL) == -1)
57		err(1, "pledge");
58
59	if (argc < 2)
60		usage();
61
62	numsig = SIGTERM;
63
64	argc--, argv++;
65	if (!strcmp(*argv, "-l")) {
66		argc--, argv++;
67		if (argc > 0 && !strcmp(*argv, "--"))
68			argc--, argv++;
69		if (argc > 1)
70			usage();
71		if (argc == 1) {
72			if (!isdigit((unsigned char)**argv))
73				usage();
74			numsig = strtonum(*argv, 1, NSIG + 127, &errstr);
75			if (errstr != NULL) {
76				if (errno == ERANGE)
77					nosig(*argv);
78				errx(1, "illegal signal number: %s", *argv);
79			}
80			printf("%s\n", sys_signame[numsig & 127]);
81			exit(0);
82		}
83		printsignals(stdout);
84		exit(0);
85	}
86
87	if (!strcmp(*argv, "-s")) {
88		argc--, argv++;
89		if (argc > 0 && !strcmp(*argv, "--"))
90			argc--, argv++;
91		if (argc < 1) {
92			warnx("option requires an argument -- s");
93			usage();
94		}
95		if (strcmp(*argv, "0")) {
96			if ((numsig = signame_to_signum(*argv)) < 0)
97				nosig(*argv);
98		} else
99			numsig = 0;
100		argc--, argv++;
101	} else if (**argv == '-') {
102		if (strcmp(*argv, "--")) {
103			++*argv;
104			if (isalpha((unsigned char)**argv)) {
105				if ((numsig = signame_to_signum(*argv)) < 0)
106					nosig(*argv);
107			} else if (isdigit((unsigned char)**argv)) {
108				numsig = strtonum(*argv, 0, NSIG - 1, &errstr);
109				if (errstr != NULL) {
110					if (errno == ERANGE)
111						nosig(*argv);
112					errx(1, "illegal signal number: %s", *argv);
113				}
114			} else
115				nosig(*argv);
116		}
117		argc--, argv++;
118	}
119
120	if (argc == 0)
121		usage();
122
123	for (errors = 0; argc; argc--, argv++) {
124		pid = strtonum(*argv, -INT_MAX, INT_MAX, &errstr);
125		if (errstr != NULL) {
126			warnx("illegal process id: %s", *argv);
127			errors = 1;
128		} else if (kill(pid, numsig) == -1) {
129			warn("%s", *argv);
130			errors = 1;
131		}
132	}
133
134	exit(errors);
135}
136
137int
138signame_to_signum(char *sig)
139{
140	int n;
141
142	if (!strncasecmp(sig, "sig", 3))
143		sig += 3;
144	for (n = 1; n < NSIG; n++) {
145		if (!strcasecmp(sys_signame[n], sig))
146			return (n);
147	}
148	return (-1);
149}
150
151void
152nosig(char *name)
153{
154
155	warnx("unknown signal %s; valid signals:", name);
156	printsignals(stderr);
157	exit(1);
158}
159
160void
161printsignals(FILE *fp)
162{
163	int n;
164
165	for (n = 1; n < NSIG; n++) {
166		(void)fprintf(fp, "%s", sys_signame[n]);
167		if (n == (NSIG / 2) || n == (NSIG - 1))
168			(void)fprintf(fp, "\n");
169		else
170			(void)fprintf(fp, " ");
171	}
172}
173
174void
175usage(void)
176{
177	(void)fprintf(stderr, "usage: %s [-s signal_name] pid ...\n",
178	    __progname);
179	(void)fprintf(stderr, "       %s -l [exit_status]\n", __progname);
180	(void)fprintf(stderr, "       %s -signal_name pid ...\n",
181	    __progname);
182	(void)fprintf(stderr, "       %s -signal_number pid ...\n",
183	    __progname);
184	exit(1);
185}
186