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 * @(#) Copyright (c) 1988, 1993, 1994 The Regents of the University of California. All rights reserved.
32 * @(#)kill.c 8.4 (Berkeley) 4/28/95
33 * $FreeBSD: src/bin/kill/kill.c,v 1.24 2011/02/04 16:40:50 jilles Exp $
34 */
35 /*
36 * Important: This file is used both as a standalone program /bin/kill and
37 * as a builtin for /bin/sh (#define SHELL).
38 */
39
40 #include <ctype.h>
41 #include <err.h>
42 #include <errno.h>
43 #include <signal.h>
44 #include <stdio.h>
45 #include <stdlib.h>
46 #include <string.h>
47
48 #ifdef SHELL
49 #define main killcmd
50 #include "bltin/bltin.h"
51 #endif
52
53 static void nosig(const char *);
54 static void printsignals(FILE *);
55 static int signame_to_signum(const char *);
56 static void usage(void);
57
58 int
main(int argc,char ** argv)59 main(int argc, char **argv)
60 {
61 long pidl;
62 pid_t pid;
63 int errors, numsig, ret;
64 char *ep;
65
66 if (argc < 2)
67 usage();
68
69 numsig = SIGTERM;
70
71 argc--, argv++;
72 if (strcmp(*argv, "-l") == 0) {
73 argc--, argv++;
74 if (argc > 1)
75 usage();
76 if (argc == 1) {
77 if (!isdigit(**argv))
78 usage();
79 numsig = strtol(*argv, &ep, 10);
80 if (**argv == '\0' || *ep != '\0')
81 errx(2, "illegal signal number: %s", *argv);
82 if (numsig >= 128)
83 numsig -= 128;
84 if (numsig <= 0 || numsig >= sys_nsig)
85 nosig(*argv);
86 printf("%s\n", sys_signame[numsig]);
87 return (0);
88 }
89 printsignals(stdout);
90 return (0);
91 }
92
93 if (strcmp(*argv, "-s") == 0) {
94 argc--, argv++;
95 if (argc < 1) {
96 warnx("option requires an argument -- s");
97 usage();
98 }
99 if (strcmp(*argv, "0") != 0) {
100 if ((numsig = signame_to_signum(*argv)) < 0)
101 nosig(*argv);
102 } else
103 numsig = 0;
104 argc--, argv++;
105 } else if (**argv == '-' && *(*argv + 1) != '-') {
106 ++*argv;
107 if (isalpha(**argv)) {
108 if ((numsig = signame_to_signum(*argv)) < 0)
109 nosig(*argv);
110 } else if (isdigit(**argv)) {
111 numsig = strtol(*argv, &ep, 10);
112 if (**argv == '\0' || *ep != '\0')
113 errx(2, "illegal signal number: %s", *argv);
114 if (numsig < 0)
115 nosig(*argv);
116 } else
117 nosig(*argv);
118 argc--, argv++;
119 }
120
121 if (argc > 0 && strncmp(*argv, "--", 2) == 0)
122 argc--, argv++;
123
124 if (argc == 0)
125 usage();
126
127 for (errors = 0; argc; argc--, argv++) {
128 #ifdef SHELL
129 if (**argv == '%')
130 ret = killjob(*argv, numsig);
131 else
132 #endif
133 {
134 pidl = strtol(*argv, &ep, 10);
135 /* Check for overflow of pid_t. */
136 pid = (pid_t)pidl;
137 if (!**argv || *ep || pid != pidl)
138 errx(2, "illegal process id: %s", *argv);
139 ret = kill(pid, numsig);
140 }
141 if (ret == -1) {
142 warn("%s", *argv);
143 errors = 1;
144 }
145 }
146
147 return (errors);
148 }
149
150 static int
signame_to_signum(const char * sig)151 signame_to_signum(const char *sig)
152 {
153 int n;
154
155 if (strncasecmp(sig, "SIG", 3) == 0)
156 sig += 3;
157 for (n = 1; n < sys_nsig; n++) {
158 if (strcasecmp(sys_signame[n], sig) == 0)
159 return(n);
160 }
161 return (-1);
162 }
163
164 static void
nosig(const char * name)165 nosig(const char *name)
166 {
167 warnx("unknown signal %s; valid signals:", name);
168 printsignals(stderr);
169 #ifdef SHELL
170 error(NULL);
171 #else
172 exit(2);
173 #endif
174 }
175
176 static void
printsignals(FILE * fp)177 printsignals(FILE *fp)
178 {
179 int n;
180
181 for (n = 1; n < sys_nsig; n++) {
182 fprintf(fp, "%s", sys_signame[n]);
183 if (n == (sys_nsig / 2) || n == (sys_nsig - 1))
184 fprintf(fp, "\n");
185 else
186 fprintf(fp, " ");
187 }
188 }
189
190 static void
usage(void)191 usage(void)
192 {
193 fprintf(stderr, "%s\n%s\n%s\n%s\n",
194 "usage: kill [-s signal_name] pid ...",
195 " kill -l [exit_status]",
196 " kill -signal_name pid ...",
197 " kill -signal_number pid ...");
198 #ifdef SHELL
199 error(NULL);
200 #else
201 exit(2);
202 #endif
203 }
204