kill.c revision 216629 
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 216629 2010-12-21 22:47:34Z 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
52#ifdef SHELL
53#define main killcmd
54#include "bltin/bltin.h"
55#include "error.h"
56#endif
57
58static void nosig(const char *);
59static void printsignals(FILE *);
60static int signame_to_signum(const char *);
61static void usage(void);
62
63int
64main(int argc, 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(2, "illegal signal number: %s", *argv);
85			if (numsig >= 128)
86				numsig -= 128;
87			if (numsig <= 0 || numsig >= sys_nsig)
88				nosig(*argv);
89			printf("%s\n", sys_signame[numsig]);
90			return (0);
91		}
92		printsignals(stdout);
93		return (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 == '-' && *(*argv + 1) != '-') {
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(2, "illegal signal number: %s", *argv);
117			if (numsig < 0)
118				nosig(*argv);
119		} else
120			nosig(*argv);
121		argc--, argv++;
122	}
123
124	if (argc > 0 && strncmp(*argv, "--", 2) == 0)
125		argc--, argv++;
126
127	if (argc == 0)
128		usage();
129
130	for (errors = 0; argc; argc--, argv++) {
131#ifdef SHELL
132		if (**argv == '%')
133			pid = getjobpgrp(*argv);
134		else
135#endif
136		{
137			pid = strtol(*argv, &ep, 10);
138			if (!**argv || *ep)
139				errx(2, "illegal process id: %s", *argv);
140		}
141		if (kill(pid, numsig) == -1) {
142			warn("%s", *argv);
143			errors = 1;
144		}
145	}
146
147	return (errors);
148}
149
150static int
151signame_to_signum(const char *sig)
152{
153	int n;
154
155	if (!strncasecmp(sig, "sig", (size_t)3))
156		sig += 3;
157	for (n = 1; n < sys_nsig; n++) {
158		if (!strcasecmp(sys_signame[n], sig))
159			return (n);
160	}
161	return (-1);
162}
163
164static void
165nosig(const char *name)
166{
167
168	warnx("unknown signal %s; valid signals:", name);
169	printsignals(stderr);
170#ifdef SHELL
171	error(NULL);
172#else
173	exit(2);
174#endif
175}
176
177static void
178printsignals(FILE *fp)
179{
180	int n;
181
182	for (n = 1; n < sys_nsig; n++) {
183		(void)fprintf(fp, "%s", sys_signame[n]);
184		if (n == (sys_nsig / 2) || n == (sys_nsig - 1))
185			(void)fprintf(fp, "\n");
186		else
187			(void)fprintf(fp, " ");
188	}
189}
190
191static void
192usage(void)
193{
194
195	(void)fprintf(stderr, "%s\n%s\n%s\n%s\n",
196		"usage: kill [-s signal_name] pid ...",
197		"       kill -l [exit_status]",
198		"       kill -signal_name pid ...",
199		"       kill -signal_number pid ...");
200#ifdef SHELL
201	error(NULL);
202#else
203	exit(2);
204#endif
205}
206