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 #include "error.h"
60 #endif
61
62 static void nosig(const char *);
63 static void printsignals(FILE *);
64 static int signame_to_signum(const char *);
65 static void usage(void);
66
67 int
main(int argc,char * argv[])68 main(int argc, char *argv[])
69 {
70 int errors, numsig, pid;
71 char *ep;
72
73 if (argc < 2)
74 usage();
75
76 numsig = SIGTERM;
77
78 argc--, argv++;
79 if (!strcmp(*argv, "-l")) {
80 argc--, argv++;
81 if (argc > 1)
82 usage();
83 if (argc == 1) {
84 if (!isdigit(**argv))
85 usage();
86 numsig = strtol(*argv, &ep, 10);
87 if (!**argv || *ep)
88 errx(2, "illegal signal number: %s", *argv);
89 if (numsig >= 128)
90 numsig -= 128;
91 if (numsig <= 0 || numsig >= sys_nsig)
92 nosig(*argv);
93 printf("%s\n", sys_signame[numsig]);
94 return (0);
95 }
96 printsignals(stdout);
97 return (0);
98 }
99
100 if (!strcmp(*argv, "-s")) {
101 argc--, argv++;
102 if (argc < 1) {
103 warnx("option requires an argument -- s");
104 usage();
105 }
106 if (strcmp(*argv, "0")) {
107 if ((numsig = signame_to_signum(*argv)) < 0)
108 nosig(*argv);
109 } else
110 numsig = 0;
111 argc--, argv++;
112 } else if (**argv == '-' && *(*argv + 1) != '-') {
113 ++*argv;
114 if (isalpha(**argv)) {
115 if ((numsig = signame_to_signum(*argv)) < 0)
116 nosig(*argv);
117 } else if (isdigit(**argv)) {
118 numsig = strtol(*argv, &ep, 10);
119 if (!**argv || *ep)
120 errx(2, "illegal signal number: %s", *argv);
121 if (numsig < 0)
122 nosig(*argv);
123 } else
124 nosig(*argv);
125 argc--, argv++;
126 }
127
128 if (argc > 0 && strncmp(*argv, "--", 2) == 0)
129 argc--, argv++;
130
131 if (argc == 0)
132 usage();
133
134 for (errors = 0; argc; argc--, argv++) {
135 #ifdef SHELL
136 if (**argv == '%')
137 pid = getjobpgrp(*argv);
138 else
139 #endif
140 {
141 pid = strtol(*argv, &ep, 10);
142 if (!**argv || *ep)
143 errx(2, "illegal process id: %s", *argv);
144 }
145 if (kill(pid, numsig) == -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