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
38 static 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
44 static char sccsid[] = "@(#)kill.c 8.4 (Berkeley) 4/28/95";
45 #endif /* not lint */
46 #endif
47 #include <sys/cdefs.h>
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 #endif
60
61 static void nosig(const char *);
62 static void printsignals(FILE *);
63 static int signame_to_signum(const char *);
64 static void usage(void) __dead2;
65
66 int
main(int argc,char * argv[])67 main(int argc, char *argv[])
68 {
69 long pidl;
70 pid_t pid;
71 int errors, numsig, ret;
72 char *ep;
73
74 if (argc < 2)
75 usage();
76
77 numsig = SIGTERM;
78
79 argc--, argv++;
80 if (!strcmp(*argv, "-l")) {
81 argc--, argv++;
82 if (argc > 1)
83 usage();
84 if (argc == 1) {
85 if (!isdigit(**argv))
86 usage();
87 numsig = strtol(*argv, &ep, 10);
88 if (!**argv || *ep)
89 errx(2, "illegal signal number: %s", *argv);
90 if (numsig >= 128)
91 numsig -= 128;
92 if (numsig <= 0 || numsig >= sys_nsig)
93 nosig(*argv);
94 printf("%s\n", sys_signame[numsig]);
95 return (0);
96 }
97 printsignals(stdout);
98 return (0);
99 }
100
101 if (!strcmp(*argv, "-s")) {
102 argc--, argv++;
103 if (argc < 1) {
104 warnx("option requires an argument -- s");
105 usage();
106 }
107 if (strcmp(*argv, "0")) {
108 if ((numsig = signame_to_signum(*argv)) < 0)
109 nosig(*argv);
110 } else
111 numsig = 0;
112 argc--, argv++;
113 } else if (**argv == '-' && *(*argv + 1) != '-') {
114 ++*argv;
115 if (isalpha(**argv)) {
116 if ((numsig = signame_to_signum(*argv)) < 0)
117 nosig(*argv);
118 } else if (isdigit(**argv)) {
119 numsig = strtol(*argv, &ep, 10);
120 if (!**argv || *ep)
121 errx(2, "illegal signal number: %s", *argv);
122 if (numsig < 0)
123 nosig(*argv);
124 } else
125 nosig(*argv);
126 argc--, argv++;
127 }
128
129 if (argc > 0 && strncmp(*argv, "--", 2) == 0)
130 argc--, argv++;
131
132 if (argc == 0)
133 usage();
134
135 for (errors = 0; argc; argc--, argv++) {
136 #ifdef SHELL
137 if (**argv == '%')
138 ret = killjob(*argv, numsig);
139 else
140 #endif
141 {
142 pidl = strtol(*argv, &ep, 10);
143 /* Check for overflow of pid_t. */
144 pid = (pid_t)pidl;
145 if (!**argv || *ep || pid != pidl)
146 errx(2, "illegal process id: %s", *argv);
147 ret = kill(pid, numsig);
148 }
149 if (ret == -1) {
150 warn("%s", *argv);
151 errors = 1;
152 }
153 }
154
155 return (errors);
156 }
157
158 static int
signame_to_signum(const char * sig)159 signame_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
172 static void
nosig(const char * name)173 nosig(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
185 static void
printsignals(FILE * fp)186 printsignals(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
199 static void
usage(void)200 usage(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