kill.c revision 210613 
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#if 0
31#ifndef lint
32static char const copyright[] =
33"@(#) Copyright (c) 1988, 1993, 1994\n\
34	The Regents of the University of California.  All rights reserved.\n";
35#endif /* not lint */
36
37#ifndef lint
38static char sccsid[] = "@(#)kill.c	8.4 (Berkeley) 4/28/95";
39#endif /* not lint */
40#endif
41#include <sys/cdefs.h>
42__FBSDID("$FreeBSD: head/bin/kill/kill.c 210613 2010-07-29 16:40:45Z jilles $");
43
44#include <ctype.h>
45#include <err.h>
46#include <errno.h>
47#include <signal.h>
48#include <stdio.h>
49#include <stdlib.h>
50#include <string.h>
51
52static void nosig(const char *);
53static void printsignals(FILE *);
54static int signame_to_signum(const char *);
55static void usage(void);
56
57int
58main(int argc, char *argv[])
59{
60	int errors, numsig, pid;
61	char *ep;
62
63	if (argc < 2)
64		usage();
65
66	numsig = SIGTERM;
67
68	argc--, argv++;
69	if (!strcmp(*argv, "-l")) {
70		argc--, argv++;
71		if (argc > 1)
72			usage();
73		if (argc == 1) {
74			if (!isdigit(**argv))
75				usage();
76			numsig = strtol(*argv, &ep, 10);
77			if (!**argv || *ep)
78				errx(1, "illegal signal number: %s", *argv);
79			if (numsig >= 128)
80				numsig -= 128;
81			if (numsig <= 0 || numsig >= sys_nsig)
82				nosig(*argv);
83			printf("%s\n", sys_signame[numsig]);
84			exit(0);
85		}
86		printsignals(stdout);
87		exit(0);
88	}
89
90	if (!strcmp(*argv, "-s")) {
91		argc--, argv++;
92		if (argc < 1) {
93			warnx("option requires an argument -- s");
94			usage();
95		}
96		if (strcmp(*argv, "0")) {
97			if ((numsig = signame_to_signum(*argv)) < 0)
98				nosig(*argv);
99		} else
100			numsig = 0;
101		argc--, argv++;
102	} else if (**argv == '-' && *(*argv + 1) != '-') {
103		++*argv;
104		if (isalpha(**argv)) {
105			if ((numsig = signame_to_signum(*argv)) < 0)
106				nosig(*argv);
107		} else if (isdigit(**argv)) {
108			numsig = strtol(*argv, &ep, 10);
109			if (!**argv || *ep)
110				errx(1, "illegal signal number: %s", *argv);
111			if (numsig < 0)
112				nosig(*argv);
113		} else
114			nosig(*argv);
115		argc--, argv++;
116	}
117
118	if (argc > 0 && strncmp(*argv, "--", 2) == 0)
119		argc--, argv++;
120
121	if (argc == 0)
122		usage();
123
124	for (errors = 0; argc; argc--, argv++) {
125		pid = strtol(*argv, &ep, 10);
126		if (!**argv || *ep)
127			errx(1, "illegal process id: %s", *argv);
128		else if (kill(pid, numsig) == -1) {
129			warn("%s", *argv);
130			errors = 1;
131		}
132	}
133
134	exit(errors);
135}
136
137static int
138signame_to_signum(const char *sig)
139{
140	int n;
141
142	if (!strncasecmp(sig, "sig", (size_t)3))
143		sig += 3;
144	for (n = 1; n < sys_nsig; n++) {
145		if (!strcasecmp(sys_signame[n], sig))
146			return (n);
147	}
148	return (-1);
149}
150
151static void
152nosig(const char *name)
153{
154
155	warnx("unknown signal %s; valid signals:", name);
156	printsignals(stderr);
157	exit(1);
158}
159
160static void
161printsignals(FILE *fp)
162{
163	int n;
164
165	for (n = 1; n < sys_nsig; n++) {
166		(void)fprintf(fp, "%s", sys_signame[n]);
167		if (n == (sys_nsig / 2) || n == (sys_nsig - 1))
168			(void)fprintf(fp, "\n");
169		else
170			(void)fprintf(fp, " ");
171	}
172}
173
174static void
175usage(void)
176{
177
178	(void)fprintf(stderr, "%s\n%s\n%s\n%s\n",
179		"usage: kill [-s signal_name] pid ...",
180		"       kill -l [exit_status]",
181		"       kill -signal_name pid ...",
182		"       kill -signal_number pid ...");
183	exit(1);
184}
185