kill.c revision 315722 
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: stable/10/bin/kill/kill.c 315722 2017-03-22 17:49:56Z bdrewery $");
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	long pidl;
71	pid_t pid;
72	int errors, numsig;
73	char *ep;
74
75	if (argc < 2)
76		usage();
77
78	numsig = SIGTERM;
79
80	argc--, argv++;
81	if (!strcmp(*argv, "-l")) {
82		argc--, argv++;
83		if (argc > 1)
84			usage();
85		if (argc == 1) {
86			if (!isdigit(**argv))
87				usage();
88			numsig = strtol(*argv, &ep, 10);
89			if (!**argv || *ep)
90				errx(2, "illegal signal number: %s", *argv);
91			if (numsig >= 128)
92				numsig -= 128;
93			if (numsig <= 0 || numsig >= sys_nsig)
94				nosig(*argv);
95			printf("%s\n", sys_signame[numsig]);
96			return (0);
97		}
98		printsignals(stdout);
99		return (0);
100	}
101
102	if (!strcmp(*argv, "-s")) {
103		argc--, argv++;
104		if (argc < 1) {
105			warnx("option requires an argument -- s");
106			usage();
107		}
108		if (strcmp(*argv, "0")) {
109			if ((numsig = signame_to_signum(*argv)) < 0)
110				nosig(*argv);
111		} else
112			numsig = 0;
113		argc--, argv++;
114	} else if (**argv == '-' && *(*argv + 1) != '-') {
115		++*argv;
116		if (isalpha(**argv)) {
117			if ((numsig = signame_to_signum(*argv)) < 0)
118				nosig(*argv);
119		} else if (isdigit(**argv)) {
120			numsig = strtol(*argv, &ep, 10);
121			if (!**argv || *ep)
122				errx(2, "illegal signal number: %s", *argv);
123			if (numsig < 0)
124				nosig(*argv);
125		} else
126			nosig(*argv);
127		argc--, argv++;
128	}
129
130	if (argc > 0 && strncmp(*argv, "--", 2) == 0)
131		argc--, argv++;
132
133	if (argc == 0)
134		usage();
135
136	for (errors = 0; argc; argc--, argv++) {
137#ifdef SHELL
138		if (**argv == '%')
139			pid = getjobpgrp(*argv);
140		else
141#endif
142		{
143			pidl = strtol(*argv, &ep, 10);
144			/* Check for overflow of pid_t. */
145			pid = (pid_t)pidl;
146			if (!**argv || *ep || pid != pidl)
147				errx(2, "illegal process id: %s", *argv);
148		}
149		if (kill(pid, numsig) == -1) {
150			warn("%s", *argv);
151			errors = 1;
152		}
153	}
154
155	return (errors);
156}
157
158static int
159signame_to_signum(const char *sig)
160{
161	int n;
162
163	if (strncasecmp(sig, "SIG", 3) == 0)
164		sig += 3;
165	for (n = 1; n < sys_nsig; n++) {
166		if (!strcasecmp(sys_signame[n], sig))
167			return (n);
168	}
169	return (-1);
170}
171
172static void
173nosig(const char *name)
174{
175
176	warnx("unknown signal %s; valid signals:", name);
177	printsignals(stderr);
178#ifdef SHELL
179	error(NULL);
180#else
181	exit(2);
182#endif
183}
184
185static void
186printsignals(FILE *fp)
187{
188	int n;
189
190	for (n = 1; n < sys_nsig; n++) {
191		(void)fprintf(fp, "%s", sys_signame[n]);
192		if (n == (sys_nsig / 2) || n == (sys_nsig - 1))
193			(void)fprintf(fp, "\n");
194		else
195			(void)fprintf(fp, " ");
196	}
197}
198
199static void
200usage(void)
201{
202
203	(void)fprintf(stderr, "%s\n%s\n%s\n%s\n",
204		"usage: kill [-s signal_name] pid ...",
205		"       kill -l [exit_status]",
206		"       kill -signal_name pid ...",
207		"       kill -signal_number pid ...");
208#ifdef SHELL
209	error(NULL);
210#else
211	exit(2);
212#endif
213}
214