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 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 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 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 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 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