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#include "sig.h"
37
38#ifdef SHELL
39#define main killcmd
40#include "bltin.h"
41#endif
42
43#ifndef __dead2
44#define __dead2 __attribute__((__noreturn__))
45#endif
46
47#include <ctype.h>
48#ifndef SHELL
49#include <err.h>
50#endif
51#include <errno.h>
52#include <signal.h>
53#include <stdio.h>
54#include <stdlib.h>
55#include <string.h>
56
57static void nosig(const char *);
58static void printsignals(FILE *);
59static void usage(void) __dead2;
60
61int
62main(int argc, char *argv[])
63{
64 char signame[SIG2STR_MAX];
65 long pidl;
66 pid_t pid;
67 int errors, numsig, ret;
68 char *ep;
69
70 if (argc < 2)
71 usage();
72
73 numsig = SIGTERM;
74
75 argc--, argv++;
76 if (!strcmp(*argv, "-l")) {
77 argc--, argv++;
78 if (argc > 1)
79 usage();
80 if (argc == 1) {
81 if (!isdigit(**argv))
82 usage();
83 numsig = strtol(*argv, &ep, 10);
84 if (!**argv || *ep)
85 errx(2, "invalid signal number: %s", *argv);
86 if (numsig >= 128)
87 numsig -= 128;
88 if (sig2str(numsig, signame) < 0)
89 nosig(*argv);
90 printf("%s\n", signame);
91 return (0);
92 }
93 printsignals(stdout);
94 return (0);
95 }
96
97 if (!strcmp(*argv, "-s")) {
98 argc--, argv++;
99 if (argc < 1) {
100 warnx("option requires an argument -- s");
101 usage();
102 }
103 if (strcmp(*argv, "0") == 0)
104 numsig = 0;
105 else if (str2sig(*argv, &numsig) < 0)
106 nosig(*argv);
107 argc--, argv++;
108 } else if (**argv == '-' && *(*argv + 1) != '-') {
109 ++*argv;
110 if (strcmp(*argv, "0") == 0)
111 numsig = 0;
112 else if (str2sig(*argv, &numsig) < 0)
113 nosig(*argv);
114 argc--, argv++;
115 }
116
117 if (argc > 0 && strncmp(*argv, "--", 2) == 0)
118 argc--, argv++;
119
120 if (argc == 0)
121 usage();
122
123 for (errors = 0; argc; argc--, argv++) {
124#ifdef SHELL
125 if (**argv == '%')
126 ret = killjob(*argv, numsig);
127 else
128#endif
129 {
130 pidl = strtol(*argv, &ep, 10);
131 /* Check for overflow of pid_t. */
132 pid = (pid_t)pidl;
133 if (!**argv || *ep || pid != pidl)
134 errx(2, "illegal process id: %s", *argv);
135 ret = kill(pid, numsig);
136 }
137 if (ret == -1) {
138 warn("%s", *argv);
139 errors = 1;
140 }
141 }
142
143 return (errors);
144}
145
146static void
147nosig(const char *name)
148{
149
150 warnx("unknown signal %s; valid signals:", name);
151 printsignals(stderr);
152#ifdef SHELL
153 error(NULL);
154#else
155 exit(2);
156#endif
157}
158
159static void
160printsignals(FILE *fp)
161{
162 int n;
163
164 for (n = 1; n < sys_nsig; n++) {
165 (void)fprintf(fp, "%s", sys_signame[n]);
166 if (n == (sys_nsig / 2) || n == (sys_nsig - 1))
167 (void)fprintf(fp, "\n");
168 else
169 (void)fprintf(fp, " ");
170 }
171}
172
173static void
174usage(void)
175{
176
177 (void)fprintf(stderr, "%s\n%s\n%s\n%s\n",
178 "usage: kill [-s signal_name] pid ...",
179 " kill -l [exit_status]",
180 " kill -signal_name pid ...",
181 " kill -signal_number pid ...");
182#ifdef SHELL
183 error(NULL);
184#else
185 exit(2);
186#endif
187}
