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 #include <ctype.h>
37 #include <err.h>
38 #include <errno.h>
39 #include <signal.h>
40 #include <stdio.h>
41 #include <stdlib.h>
42 #include <string.h>
43
44 #ifdef SHELL
45 #define main killcmd
46 #include "bltin/bltin.h"
47 #endif
48
49 static void nosig(const char *);
50 static void printsignals(FILE *);
51 static int signame_to_signum(const char *);
52 static void usage(void) __dead2;
53
54 int
main(int argc,char * argv[])55 main(int argc, char *argv[])
56 {
57 long pidl;
58 pid_t pid;
59 int errors, numsig, ret;
60 char *ep;
61
62 if (argc < 2)
63 usage();
64
65 numsig = SIGTERM;
66
67 argc--, argv++;
68 if (!strcmp(*argv, "-l")) {
69 argc--, argv++;
70 if (argc > 1)
71 usage();
72 if (argc == 1) {
73 if (!isdigit(**argv))
74 usage();
75 numsig = strtol(*argv, &ep, 10);
76 if (!**argv || *ep)
77 errx(2, "illegal signal number: %s", *argv);
78 if (numsig >= 128)
79 numsig -= 128;
80 if (numsig <= 0 || numsig >= sys_nsig)
81 nosig(*argv);
82 printf("%s\n", sys_signame[numsig]);
83 return (0);
84 }
85 printsignals(stdout);
86 return (0);
87 }
88
89 if (!strcmp(*argv, "-s")) {
90 argc--, argv++;
91 if (argc < 1) {
92 warnx("option requires an argument -- s");
93 usage();
94 }
95 if (strcmp(*argv, "0")) {
96 if ((numsig = signame_to_signum(*argv)) < 0)
97 nosig(*argv);
98 } else
99 numsig = 0;
100 argc--, argv++;
101 } else if (**argv == '-' && *(*argv + 1) != '-') {
102 ++*argv;
103 if (isalpha(**argv)) {
104 if ((numsig = signame_to_signum(*argv)) < 0)
105 nosig(*argv);
106 } else if (isdigit(**argv)) {
107 numsig = strtol(*argv, &ep, 10);
108 if (!**argv || *ep)
109 errx(2, "illegal signal number: %s", *argv);
110 if (numsig < 0)
111 nosig(*argv);
112 } else
113 nosig(*argv);
114 argc--, argv++;
115 }
116
117 if (argc > 0 && strncmp(*argv, "--", 2) == 0)
118 argc--, argv++;
119
120 if (argc == 0)
121 usage();
122
123 for (errors = 0; argc; argc--, argv++) {
124 #ifdef SHELL
125 if (**argv == '%')
126 ret = killjob(*argv, numsig);
127 else
128 #endif
129 {
130 pidl = strtol(*argv, &ep, 10);
131 /* Check for overflow of pid_t. */
132 pid = (pid_t)pidl;
133 if (!**argv || *ep || pid != pidl)
134 errx(2, "illegal process id: %s", *argv);
135 ret = kill(pid, numsig);
136 }
137 if (ret == -1) {
138 warn("%s", *argv);
139 errors = 1;
140 }
141 }
142
143 return (errors);
144 }
145
146 static int
signame_to_signum(const char * sig)147 signame_to_signum(const char *sig)
148 {
149 int n;
150
151 if (strncasecmp(sig, "SIG", 3) == 0)
152 sig += 3;
153 for (n = 1; n < sys_nsig; n++) {
154 if (!strcasecmp(sys_signame[n], sig))
155 return (n);
156 }
157 return (-1);
158 }
159
160 static void
nosig(const char * name)161 nosig(const char *name)
162 {
163
164 warnx("unknown signal %s; valid signals:", name);
165 printsignals(stderr);
166 #ifdef SHELL
167 error(NULL);
168 #else
169 exit(2);
170 #endif
171 }
172
173 static void
printsignals(FILE * fp)174 printsignals(FILE *fp)
175 {
176 int n;
177
178 for (n = 1; n < sys_nsig; n++) {
179 (void)fprintf(fp, "%s", sys_signame[n]);
180 if (n == (sys_nsig / 2) || n == (sys_nsig - 1))
181 (void)fprintf(fp, "\n");
182 else
183 (void)fprintf(fp, " ");
184 }
185 }
186
187 static void
usage(void)188 usage(void)
189 {
190
191 (void)fprintf(stderr, "%s\n%s\n%s\n%s\n",
192 "usage: kill [-s signal_name] pid ...",
193 " kill -l [exit_status]",
194 " kill -signal_name pid ...",
195 " kill -signal_number pid ...");
196 #ifdef SHELL
197 error(NULL);
198 #else
199 exit(2);
200 #endif
201 }
202