1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1988, 1993, 1994
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 *    may be used to endorse or promote products derived from this software
17 *    without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31/*
32 * Important: This file is used both as a standalone program /bin/kill and
33 * as a builtin for /bin/sh (#define SHELL).
34 */
35
36#if 0
37#ifndef lint
38static char const copyright[] =
39"@(#) Copyright (c) 1988, 1993, 1994\n\
40	The Regents of the University of California.  All rights reserved.\n";
41#endif /* not lint */
42
43#ifndef lint
44static char sccsid[] = "@(#)kill.c	8.4 (Berkeley) 4/28/95";
45#endif /* not lint */
46#endif
47#include <sys/cdefs.h>
48__FBSDID("$FreeBSD$");
49
50#include <ctype.h>
51#include <err.h>
52#include <errno.h>
53#include <signal.h>
54#include <stdio.h>
55#include <stdlib.h>
56#include <string.h>
57
58#ifdef SHELL
59#define main killcmd
60#include "bltin/bltin.h"
61#endif
62
63static void nosig(const char *);
64static void printsignals(FILE *);
65static int signame_to_signum(const char *);
66static void usage(void);
67
68int
69main(int argc, char *argv[])
70{
71	long pidl;
72	pid_t pid;
73	int errors, numsig, ret;
74	char *ep;
75
76	if (argc < 2)
77		usage();
78
79	numsig = SIGTERM;
80
81	argc--, argv++;
82	if (!strcmp(*argv, "-l")) {
83		argc--, argv++;
84		if (argc > 1)
85			usage();
86		if (argc == 1) {
87			if (!isdigit(**argv))
88				usage();
89			numsig = strtol(*argv, &ep, 10);
90			if (!**argv || *ep)
91				errx(2, "illegal signal number: %s", *argv);
92			if (numsig >= 128)
93				numsig -= 128;
94			if (numsig <= 0 || numsig >= sys_nsig)
95				nosig(*argv);
96			printf("%s\n", sys_signame[numsig]);
97			return (0);
98		}
99		printsignals(stdout);
100		return (0);
101	}
102
103	if (!strcmp(*argv, "-s")) {
104		argc--, argv++;
105		if (argc < 1) {
106			warnx("option requires an argument -- s");
107			usage();
108		}
109		if (strcmp(*argv, "0")) {
110			if ((numsig = signame_to_signum(*argv)) < 0)
111				nosig(*argv);
112		} else
113			numsig = 0;
114		argc--, argv++;
115	} else if (**argv == '-' && *(*argv + 1) != '-') {
116		++*argv;
117		if (isalpha(**argv)) {
118			if ((numsig = signame_to_signum(*argv)) < 0)
119				nosig(*argv);
120		} else if (isdigit(**argv)) {
121			numsig = strtol(*argv, &ep, 10);
122			if (!**argv || *ep)
123				errx(2, "illegal signal number: %s", *argv);
124			if (numsig < 0)
125				nosig(*argv);
126		} else
127			nosig(*argv);
128		argc--, argv++;
129	}
130
131	if (argc > 0 && strncmp(*argv, "--", 2) == 0)
132		argc--, argv++;
133
134	if (argc == 0)
135		usage();
136
137	for (errors = 0; argc; argc--, argv++) {
138#ifdef SHELL
139		if (**argv == '%')
140			ret = killjob(*argv, numsig);
141		else
142#endif
143		{
144			pidl = strtol(*argv, &ep, 10);
145			/* Check for overflow of pid_t. */
146			pid = (pid_t)pidl;
147			if (!**argv || *ep || pid != pidl)
148				errx(2, "illegal process id: %s", *argv);
149			ret = kill(pid, numsig);
150		}
151		if (ret == -1) {
152			warn("%s", *argv);
153			errors = 1;
154		}
155	}
156
157	return (errors);
158}
159
160static int
161signame_to_signum(const char *sig)
162{
163	int n;
164
165	if (strncasecmp(sig, "SIG", 3) == 0)
166		sig += 3;
167	for (n = 1; n < sys_nsig; n++) {
168		if (!strcasecmp(sys_signame[n], sig))
169			return (n);
170	}
171	return (-1);
172}
173
174static void
175nosig(const char *name)
176{
177
178	warnx("unknown signal %s; valid signals:", name);
179	printsignals(stderr);
180#ifdef SHELL
181	error(NULL);
182#else
183	exit(2);
184#endif
185}
186
187static void
188printsignals(FILE *fp)
189{
190	int n;
191
192	for (n = 1; n < sys_nsig; n++) {
193		(void)fprintf(fp, "%s", sys_signame[n]);
194		if (n == (sys_nsig / 2) || n == (sys_nsig - 1))
195			(void)fprintf(fp, "\n");
196		else
197			(void)fprintf(fp, " ");
198	}
199}
200
201static void
202usage(void)
203{
204
205	(void)fprintf(stderr, "%s\n%s\n%s\n%s\n",
206		"usage: kill [-s signal_name] pid ...",
207		"       kill -l [exit_status]",
208		"       kill -signal_name pid ...",
209		"       kill -signal_number pid ...");
210#ifdef SHELL
211	error(NULL);
212#else
213	exit(2);
214#endif
215}
216