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