1/*-
2 * Copyright (c) 1988, 1993, 1994
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 4. Neither the name of the University nor the names of its contributors
14 *    may be used to endorse or promote products derived from this software
15 *    without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29/*
30 * Important: This file is used both as a standalone program /bin/kill and
31 * as a builtin for /bin/sh (#define SHELL).
32 */
33
34#if 0
35#ifndef lint
36static char const copyright[] =
37"@(#) Copyright (c) 1988, 1993, 1994\n\
38	The Regents of the University of California.  All rights reserved.\n";
39#endif /* not lint */
40
41#ifndef lint
42static char sccsid[] = "@(#)kill.c	8.4 (Berkeley) 4/28/95";
43#endif /* not lint */
44#endif
45#include <sys/cdefs.h>
46__FBSDID("$FreeBSD$");
47
48#include <ctype.h>
49#include <err.h>
50#include <errno.h>
51#include <signal.h>
52#include <stdio.h>
53#include <stdlib.h>
54#include <string.h>
55
56#ifdef SHELL
57#define main killcmd
58#include "bltin/bltin.h"
59#include "error.h"
60#endif
61
62static void nosig(const char *);
63static void printsignals(FILE *);
64static int signame_to_signum(const char *);
65static void usage(void);
66
67int
68main(int argc, char *argv[])
69{
70	int errors, numsig, pid;
71	char *ep;
72
73	if (argc < 2)
74		usage();
75
76	numsig = SIGTERM;
77
78	argc--, argv++;
79	if (!strcmp(*argv, "-l")) {
80		argc--, argv++;
81		if (argc > 1)
82			usage();
83		if (argc == 1) {
84			if (!isdigit(**argv))
85				usage();
86			numsig = strtol(*argv, &ep, 10);
87			if (!**argv || *ep)
88				errx(2, "illegal signal number: %s", *argv);
89			if (numsig >= 128)
90				numsig -= 128;
91			if (numsig <= 0 || numsig >= sys_nsig)
92				nosig(*argv);
93			printf("%s\n", sys_signame[numsig]);
94			return (0);
95		}
96		printsignals(stdout);
97		return (0);
98	}
99
100	if (!strcmp(*argv, "-s")) {
101		argc--, argv++;
102		if (argc < 1) {
103			warnx("option requires an argument -- s");
104			usage();
105		}
106		if (strcmp(*argv, "0")) {
107			if ((numsig = signame_to_signum(*argv)) < 0)
108				nosig(*argv);
109		} else
110			numsig = 0;
111		argc--, argv++;
112	} else if (**argv == '-' && *(*argv + 1) != '-') {
113		++*argv;
114		if (isalpha(**argv)) {
115			if ((numsig = signame_to_signum(*argv)) < 0)
116				nosig(*argv);
117		} else if (isdigit(**argv)) {
118			numsig = strtol(*argv, &ep, 10);
119			if (!**argv || *ep)
120				errx(2, "illegal signal number: %s", *argv);
121			if (numsig < 0)
122				nosig(*argv);
123		} else
124			nosig(*argv);
125		argc--, argv++;
126	}
127
128	if (argc > 0 && strncmp(*argv, "--", 2) == 0)
129		argc--, argv++;
130
131	if (argc == 0)
132		usage();
133
134	for (errors = 0; argc; argc--, argv++) {
135#ifdef SHELL
136		if (**argv == '%')
137			pid = getjobpgrp(*argv);
138		else
139#endif
140		{
141			pid = strtol(*argv, &ep, 10);
142			if (!**argv || *ep)
143				errx(2, "illegal process id: %s", *argv);
144		}
145		if (kill(pid, numsig) == -1) {
146			warn("%s", *argv);
147			errors = 1;
148		}
149	}
150
151	return (errors);
152}
153
154static int
155signame_to_signum(const char *sig)
156{
157	int n;
158
159	if (strncasecmp(sig, "SIG", 3) == 0)
160		sig += 3;
161	for (n = 1; n < sys_nsig; n++) {
162		if (!strcasecmp(sys_signame[n], sig))
163			return (n);
164	}
165	return (-1);
166}
167
168static void
169nosig(const char *name)
170{
171
172	warnx("unknown signal %s; valid signals:", name);
173	printsignals(stderr);
174#ifdef SHELL
175	error(NULL);
176#else
177	exit(2);
178#endif
179}
180
181static void
182printsignals(FILE *fp)
183{
184	int n;
185
186	for (n = 1; n < sys_nsig; n++) {
187		(void)fprintf(fp, "%s", sys_signame[n]);
188		if (n == (sys_nsig / 2) || n == (sys_nsig - 1))
189			(void)fprintf(fp, "\n");
190		else
191			(void)fprintf(fp, " ");
192	}
193}
194
195static void
196usage(void)
197{
198
199	(void)fprintf(stderr, "%s\n%s\n%s\n%s\n",
200		"usage: kill [-s signal_name] pid ...",
201		"       kill -l [exit_status]",
202		"       kill -signal_name pid ...",
203		"       kill -signal_number pid ...");
204#ifdef SHELL
205	error(NULL);
206#else
207	exit(2);
208#endif
209}
210