kill.c revision 90110 
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 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by the University of
16 *	California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#ifndef lint
35static char const copyright[] =
36"@(#) Copyright (c) 1988, 1993, 1994\n\
37	The Regents of the University of California.  All rights reserved.\n";
38#endif /* not lint */
39
40#ifndef lint
41#if 0
42static char sccsid[] = "@(#)kill.c	8.4 (Berkeley) 4/28/95";
43#endif
44static const char rcsid[] =
45  "$FreeBSD: head/bin/kill/kill.c 90110 2002-02-02 06:48:10Z imp $";
46#endif /* not lint */
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
56void nosig(char *);
57void printsignals(FILE *);
58int signame_to_signum(char *);
59void usage(void);
60
61int
62main(int argc, char *argv[])
63{
64	int errors, numsig, pid;
65	char *ep;
66
67	if (argc < 2)
68		usage();
69
70	numsig = SIGTERM;
71
72	argc--, argv++;
73	if (!strcmp(*argv, "-l")) {
74		argc--, argv++;
75		if (argc > 1)
76			usage();
77		if (argc == 1) {
78			if (!isdigit(**argv))
79				usage();
80			numsig = strtol(*argv, &ep, 10);
81			if (!**argv || *ep)
82				errx(1, "illegal signal number: %s", *argv);
83			if (numsig >= 128)
84				numsig -= 128;
85			if (numsig <= 0 || numsig >= NSIG)
86				nosig(*argv);
87			printf("%s\n", sys_signame[numsig]);
88			exit(0);
89		}
90		printsignals(stdout);
91		exit(0);
92	}
93
94	if (!strcmp(*argv, "-s")) {
95		argc--, argv++;
96		if (argc < 1) {
97			warnx("option requires an argument -- s");
98			usage();
99		}
100		if (strcmp(*argv, "0")) {
101			if ((numsig = signame_to_signum(*argv)) < 0)
102				nosig(*argv);
103		} else
104			numsig = 0;
105		argc--, argv++;
106	} else if (**argv == '-') {
107		++*argv;
108		if (isalpha(**argv)) {
109			if ((numsig = signame_to_signum(*argv)) < 0)
110				nosig(*argv);
111		} else if (isdigit(**argv)) {
112			numsig = strtol(*argv, &ep, 10);
113			if (!**argv || *ep)
114				errx(1, "illegal signal number: %s", *argv);
115			if (numsig < 0 || numsig >= NSIG)
116				nosig(*argv);
117		} else
118			nosig(*argv);
119		argc--, argv++;
120	}
121
122	if (argc == 0)
123		usage();
124
125	for (errors = 0; argc; argc--, argv++) {
126		pid = strtol(*argv, &ep, 10);
127		if (!**argv || *ep) {
128			warnx("illegal process id: %s", *argv);
129			errors = 1;
130		} else if (kill(pid, numsig) == -1) {
131			warn("%s", *argv);
132			errors = 1;
133		}
134	}
135
136	exit(errors);
137}
138
139int
140signame_to_signum(char *sig)
141{
142	int n;
143
144	if (!strncasecmp(sig, "sig", (size_t)3))
145		sig += 3;
146	for (n = 1; n < NSIG; n++) {
147		if (!strcasecmp(sys_signame[n], sig))
148			return (n);
149	}
150	return (-1);
151}
152
153void
154nosig(char *name)
155{
156
157	warnx("unknown signal %s; valid signals:", name);
158	printsignals(stderr);
159	exit(1);
160}
161
162void
163printsignals(FILE *fp)
164{
165	int n;
166
167	for (n = 1; n < NSIG; n++) {
168		(void)fprintf(fp, "%s", sys_signame[n]);
169		if (n == (NSIG / 2) || n == (NSIG - 1))
170			(void)fprintf(fp, "\n");
171		else
172			(void)fprintf(fp, " ");
173	}
174}
175
176void
177usage(void)
178{
179
180	(void)fprintf(stderr, "%s\n%s\n%s\n%s\n",
181		"usage: kill [-s signal_name] pid ...",
182		"       kill -l [exit_status]",
183		"       kill -signal_name pid ...",
184		"       kill -signal_number pid ...");
185	exit(1);
186}
187