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