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 #include "error.h" 52 #endif 53 54 static void nosig(const char *); 55 static void printsignals(FILE *); 56 static int signame_to_signum(const char *); 57 static void usage(void); 58 59 int 60 main(int argc, char **argv) 61 { 62 long pidl; 63 pid_t pid; 64 int errors, numsig, ret; 65 char *ep; 66 67 if (argc < 2) 68 usage(); 69 70 numsig = SIGTERM; 71 72 argc--, argv++; 73 if (strcmp(*argv, "-l") == 0) { 74 argc--, argv++; 75 if (argc > 1) 76 usage(); 77 if (argc == 1) { 78 if (!isdigit(**argv)) 79 usage(); 80 numsig = strtol(*argv, &ep, 10); 81 if (**argv == '\0' || *ep != '\0') 82 errx(2, "illegal signal number: %s", *argv); 83 if (numsig >= 128) 84 numsig -= 128; 85 if (numsig <= 0 || numsig >= sys_nsig) 86 nosig(*argv); 87 printf("%s\n", sys_signame[numsig]); 88 return (0); 89 } 90 printsignals(stdout); 91 return (0); 92 } 93 94 if (strcmp(*argv, "-s") == 0) { 95 argc--, argv++; 96 if (argc < 1) { 97 warnx("option requires an argument -- s"); 98 usage(); 99 } 100 if (strcmp(*argv, "0") != 0) { 101 if ((numsig = signame_to_signum(*argv)) < 0) 102 nosig(*argv); 103 } else 104 numsig = 0; 105 argc--, argv++; 106 } else if (**argv == '-' && *(*argv + 1) != '-') { 107 ++*argv; 108 if (isalpha(**argv)) { 109 if ((numsig = signame_to_signum(*argv)) < 0) 110 nosig(*argv); 111 } else if (isdigit(**argv)) { 112 numsig = strtol(*argv, &ep, 10); 113 if (**argv == '\0' || *ep != '\0') 114 errx(2, "illegal signal number: %s", *argv); 115 if (numsig < 0) 116 nosig(*argv); 117 } else 118 nosig(*argv); 119 argc--, argv++; 120 } 121 122 if (argc > 0 && strncmp(*argv, "--", 2) == 0) 123 argc--, argv++; 124 125 if (argc == 0) 126 usage(); 127 128 for (errors = 0; argc; argc--, argv++) { 129 #ifdef SHELL 130 if (**argv == '%') 131 ret = killjob(*argv, numsig); 132 else 133 #endif 134 { 135 pidl = strtol(*argv, &ep, 10); 136 /* Check for overflow of pid_t. */ 137 pid = (pid_t)pidl; 138 if (!**argv || *ep || pid != pidl) 139 errx(2, "illegal process id: %s", *argv); 140 ret = kill(pid, numsig); 141 } 142 if (ret == -1) { 143 warn("%s", *argv); 144 errors = 1; 145 } 146 } 147 148 return (errors); 149 } 150 151 static int 152 signame_to_signum(const char *sig) 153 { 154 int n; 155 156 if (strncasecmp(sig, "SIG", 3) == 0) 157 sig += 3; 158 for (n = 1; n < sys_nsig; n++) { 159 if (strcasecmp(sys_signame[n], sig) == 0) 160 return(n); 161 } 162 return (-1); 163 } 164 165 static void 166 nosig(const char *name) 167 { 168 warnx("unknown signal %s; valid signals:", name); 169 printsignals(stderr); 170 #ifdef SHELL 171 error(NULL); 172 #else 173 exit(2); 174 #endif 175 } 176 177 static void 178 printsignals(FILE *fp) 179 { 180 int n; 181 182 for (n = 1; n < sys_nsig; n++) { 183 fprintf(fp, "%s", sys_signame[n]); 184 if (n == (sys_nsig / 2) || n == (sys_nsig - 1)) 185 fprintf(fp, "\n"); 186 else 187 fprintf(fp, " "); 188 } 189 } 190 191 static void 192 usage(void) 193 { 194 fprintf(stderr, "%s\n%s\n%s\n%s\n", 195 "usage: kill [-s signal_name] pid ...", 196 " kill -l [exit_status]", 197 " kill -signal_name pid ...", 198 " kill -signal_number pid ..."); 199 #ifdef SHELL 200 error(NULL); 201 #else 202 exit(2); 203 #endif 204 } 205