Add various improvements to the "pre-flight installer":
[dragonfly.git] / bin / kill / kill.c
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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 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
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32 *
33 * @(#) Copyright (c) 1988, 1993, 1994 The Regents of the University of California. All rights reserved.
34 * @(#)kill.c 8.4 (Berkeley) 4/28/95
35 * $FreeBSD: src/bin/kill/kill.c,v 1.11.2.2 2002/07/28 10:19:57 tjr Exp $
57fed2af 36 * $DragonFly: src/bin/kill/kill.c,v 1.5 2004/11/07 20:54:51 eirikn Exp $
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37 */
38
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39#include <ctype.h>
40#include <err.h>
41#include <errno.h>
42#include <signal.h>
43#include <stdio.h>
44#include <stdlib.h>
45#include <string.h>
46
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47static void nosig(const char *);
48static void printsignals(FILE *);
49static int signame_to_signum(const char *);
50static void usage(void);
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51
52int
53main(int argc, char *argv[])
54{
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55 int errors, numsig;
56 pid_t pid;
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57 char *ep;
58
59 if (argc < 2)
60 usage();
61
62 numsig = SIGTERM;
63
64 argc--, argv++;
65 if (!strcmp(*argv, "-l")) {
66 argc--, argv++;
67 if (argc > 1)
68 usage();
69 if (argc == 1) {
70 if (!isdigit(**argv))
71 usage();
72 numsig = strtol(*argv, &ep, 10);
73 if (!**argv || *ep)
74 errx(1, "illegal signal number: %s", *argv);
75 if (numsig >= 128)
76 numsig -= 128;
9f8c5148 77 if (numsig <= 0 || numsig >= sys_nsig)
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78 nosig(*argv);
79 printf("%s\n", sys_signame[numsig]);
80 exit(0);
81 }
82 printsignals(stdout);
83 exit(0);
84 }
85
86 if (!strcmp(*argv, "-s")) {
87 argc--, argv++;
88 if (argc < 1) {
89 warnx("option requires an argument -- s");
90 usage();
91 }
92 if (strcmp(*argv, "0")) {
93 if ((numsig = signame_to_signum(*argv)) < 0)
94 nosig(*argv);
95 } else
96 numsig = 0;
97 argc--, argv++;
98 } else if (**argv == '-' && *(*argv + 1) != '-') {
99 ++*argv;
100 if (isalpha(**argv)) {
101 if ((numsig = signame_to_signum(*argv)) < 0)
102 nosig(*argv);
103 } else if (isdigit(**argv)) {
104 numsig = strtol(*argv, &ep, 10);
105 if (!**argv || *ep)
106 errx(1, "illegal signal number: %s", *argv);
9f8c5148 107 if (numsig < 0 || numsig >= sys_nsig)
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108 nosig(*argv);
109 } else
110 nosig(*argv);
111 argc--, argv++;
112 }
113
114 if (argc > 0 && strncmp(*argv, "--", 2) == 0)
115 argc--, argv++;
116
117 if (argc == 0)
118 usage();
119
120 for (errors = 0; argc; argc--, argv++) {
2848dd31 121 pid = (pid_t)strtol(*argv, &ep, 10);
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122 if (!**argv || *ep) {
123 warnx("illegal process id: %s", *argv);
124 errors = 1;
125 } else if (kill(pid, numsig) == -1) {
126 warn("%s", *argv);
127 errors = 1;
128 }
129 }
130
131 exit(errors);
132}
133
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134static int
135signame_to_signum(const char *sig)
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136{
137 int n;
138
139 if (!strncasecmp(sig, "sig", (size_t)3))
140 sig += 3;
9f8c5148 141 for (n = 1; n < sys_nsig; n++) {
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142 if (!strcasecmp(sys_signame[n], sig))
143 return (n);
144 }
145 return (-1);
146}
147
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148static void
149nosig(const char *name)
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150{
151
152 warnx("unknown signal %s; valid signals:", name);
153 printsignals(stderr);
154 exit(1);
155}
156
2848dd31 157static void
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158printsignals(FILE *fp)
159{
160 int n;
161
9f8c5148 162 for (n = 1; n < sys_nsig; n++) {
2848dd31 163 fprintf(fp, "%s", sys_signame[n]);
9f8c5148 164 if (n == (sys_nsig / 2) || n == (sys_nsig - 1))
57fed2af 165 fprintf(fp, "\n");
984263bc 166 else
57fed2af 167 fprintf(fp, " ");
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168 }
169}
170
2848dd31 171static void
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172usage(void)
173{
174
57fed2af 175 fprintf(stderr, "%s\n%s\n%s\n%s\n",
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176 "usage: kill [-s signal_name] pid ...",
177 " kill -l [exit_status]",
178 " kill -signal_name pid ...",
179 " kill -signal_number pid ...");
180 exit(1);
181}