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 __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
63 static void nosig(const char *);
64 static void printsignals(FILE *);
65 static int signame_to_signum(const char *);
66 static void usage(void);
67
68 int
main(int argc,char * argv[])69 main(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
160 static int
signame_to_signum(const char * sig)161 signame_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
174 static void
nosig(const char * name)175 nosig(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
187 static void
printsignals(FILE * fp)188 printsignals(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
201 static void
usage(void)202 usage(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