kill.c revision 36012 
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	"$Id$";
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 __P((char *));
57void printsignals __P((FILE *));
58int signame_to_signum __P((char *));
59void usage __P((void));
60
61int
62main(argc, argv)
63	int argc;
64	char *argv[];
65{
66	int errors, numsig, pid;
67	char *ep;
68
69	if (argc < 2)
70		usage();
71
72	numsig = SIGTERM;
73
74	argc--, argv++;
75	if (!strcmp(*argv, "-l")) {
76		argc--, argv++;
77		if (argc > 1)
78			usage();
79		if (argc == 1) {
80			if (!isdigit(**argv))
81				usage();
82			numsig = strtol(*argv, &ep, 10);
83			if (!**argv || *ep)
84				errx(1, "illegal signal number: %s", *argv);
85			if (numsig >= 128)
86				numsig -= 128;
87			if (numsig <= 0 || numsig >= NSIG)
88				nosig(*argv);
89			printf("%s\n", sys_signame[numsig]);
90			exit(0);
91		}
92		printsignals(stdout);
93		exit(0);
94	}
95
96	if (!strcmp(*argv, "-s")) {
97		argc--, argv++;
98		if (argc < 1) {
99			warnx("option requires an argument -- s");
100			usage();
101		}
102		if (strcmp(*argv, "0")) {
103			if ((numsig = signame_to_signum(*argv)) < 0)
104				nosig(*argv);
105		} else
106			numsig = 0;
107		argc--, argv++;
108	} else if (**argv == '-') {
109		++*argv;
110		if (isalpha(**argv)) {
111			if ((numsig = signame_to_signum(*argv)) < 0)
112				nosig(*argv);
113		} else if (isdigit(**argv)) {
114			numsig = strtol(*argv, &ep, 10);
115			if (!**argv || *ep)
116				errx(1, "illegal signal number: %s", *argv);
117			if (numsig < 0 || numsig >= NSIG)
118				nosig(*argv);
119		} else
120			nosig(*argv);
121		argc--, argv++;
122	}
123
124	if (argc == 0)
125		usage();
126
127	for (errors = 0; argc; argc--, argv++) {
128		pid = strtol(*argv, &ep, 10);
129		if (!**argv || *ep) {
130			warnx("illegal process id: %s", *argv);
131			errors = 1;
132		} else if (kill(pid, numsig) == -1) {
133			warn("%s", *argv);
134			errors = 1;
135		}
136	}
137
138	exit(errors);
139}
140
141int
142signame_to_signum(sig)
143	char *sig;
144{
145	int n;
146
147	if (!strncasecmp(sig, "sig", 3))
148		sig += 3;
149	for (n = 1; n < NSIG; n++) {
150		if (!strcasecmp(sys_signame[n], sig))
151			return (n);
152	}
153	return (-1);
154}
155
156void
157nosig(name)
158	char *name;
159{
160
161	warnx("unknown signal %s; valid signals:", name);
162	printsignals(stderr);
163	exit(1);
164}
165
166void
167printsignals(fp)
168	FILE *fp;
169{
170	int n;
171
172	for (n = 1; n < NSIG; n++) {
173		(void)fprintf(fp, "%s", sys_signame[n]);
174		if (n == (NSIG / 2) || n == (NSIG - 1))
175			(void)fprintf(fp, "\n");
176		else
177			(void)fprintf(fp, " ");
178	}
179}
180
181void
182usage()
183{
184
185	(void)fprintf(stderr, "%s\n%s\n%s\n%s\n",
186		"usage: kill [-s signal_name] pid ...",
187		"       kill -l [exit_status]",
188		"       kill -signal_name pid ...",
189		"       kill -signal_number pid ...");
190	exit(1);
191}
192