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 #if 0 37 #ifndef lint 38 static char const copyright[] = 39 "@(#) Copyright (c) 1988, 1993, 1994\n\ 40 The Regents of the University of California. All rights reserved.\n"; 41 #endif /* not lint */ 42 43 #ifndef lint 44 static char sccsid[] = "@(#)kill.c 8.4 (Berkeley) 4/28/95"; 45 #endif /* not lint */ 46 #endif 47 #include <sys/cdefs.h> 48 __FBSDID("$FreeBSD$"); 49 50 #include <ctype.h> 51 #include <err.h> 52 #include <errno.h> 53 #include <signal.h> 54 #include <stdio.h> 55 #include <stdlib.h> 56 #include <string.h> 57 58 #ifdef SHELL 59 #define main killcmd 60 #include "bltin/bltin.h" 61 #endif 62 63 static void nosig(const char *); 64 static void printsignals(FILE *); 65 static int signame_to_signum(const char *); 66 static void usage(void); 67 68 int 69 main(int argc, char *argv[]) 70 { 71 long pidl; 72 pid_t pid; 73 int errors, numsig, ret; 74 char *ep; 75 76 if (argc < 2) 77 usage(); 78 79 numsig = SIGTERM; 80 81 argc--, argv++; 82 if (!strcmp(*argv, "-l")) { 83 argc--, argv++; 84 if (argc > 1) 85 usage(); 86 if (argc == 1) { 87 if (!isdigit(**argv)) 88 usage(); 89 numsig = strtol(*argv, &ep, 10); 90 if (!**argv || *ep) 91 errx(2, "illegal signal number: %s", *argv); 92 if (numsig >= 128) 93 numsig -= 128; 94 if (numsig <= 0 || numsig >= sys_nsig) 95 nosig(*argv); 96 printf("%s\n", sys_signame[numsig]); 97 return (0); 98 } 99 printsignals(stdout); 100 return (0); 101 } 102 103 if (!strcmp(*argv, "-s")) { 104 argc--, argv++; 105 if (argc < 1) { 106 warnx("option requires an argument -- s"); 107 usage(); 108 } 109 if (strcmp(*argv, "0")) { 110 if ((numsig = signame_to_signum(*argv)) < 0) 111 nosig(*argv); 112 } else 113 numsig = 0; 114 argc--, argv++; 115 } else if (**argv == '-' && *(*argv + 1) != '-') { 116 ++*argv; 117 if (isalpha(**argv)) { 118 if ((numsig = signame_to_signum(*argv)) < 0) 119 nosig(*argv); 120 } else if (isdigit(**argv)) { 121 numsig = strtol(*argv, &ep, 10); 122 if (!**argv || *ep) 123 errx(2, "illegal signal number: %s", *argv); 124 if (numsig < 0) 125 nosig(*argv); 126 } else 127 nosig(*argv); 128 argc--, argv++; 129 } 130 131 if (argc > 0 && strncmp(*argv, "--", 2) == 0) 132 argc--, argv++; 133 134 if (argc == 0) 135 usage(); 136 137 for (errors = 0; argc; argc--, argv++) { 138 #ifdef SHELL 139 if (**argv == '%') 140 ret = killjob(*argv, numsig); 141 else 142 #endif 143 { 144 pidl = strtol(*argv, &ep, 10); 145 /* Check for overflow of pid_t. */ 146 pid = (pid_t)pidl; 147 if (!**argv || *ep || pid != pidl) 148 errx(2, "illegal process id: %s", *argv); 149 ret = kill(pid, numsig); 150 } 151 if (ret == -1) { 152 warn("%s", *argv); 153 errors = 1; 154 } 155 } 156 157 return (errors); 158 } 159 160 static int 161 signame_to_signum(const char *sig) 162 { 163 int n; 164 165 if (strncasecmp(sig, "SIG", 3) == 0) 166 sig += 3; 167 for (n = 1; n < sys_nsig; n++) { 168 if (!strcasecmp(sys_signame[n], sig)) 169 return (n); 170 } 171 return (-1); 172 } 173 174 static void 175 nosig(const char *name) 176 { 177 178 warnx("unknown signal %s; valid signals:", name); 179 printsignals(stderr); 180 #ifdef SHELL 181 error(NULL); 182 #else 183 exit(2); 184 #endif 185 } 186 187 static void 188 printsignals(FILE *fp) 189 { 190 int n; 191 192 for (n = 1; n < sys_nsig; n++) { 193 (void)fprintf(fp, "%s", sys_signame[n]); 194 if (n == (sys_nsig / 2) || n == (sys_nsig - 1)) 195 (void)fprintf(fp, "\n"); 196 else 197 (void)fprintf(fp, " "); 198 } 199 } 200 201 static void 202 usage(void) 203 { 204 205 (void)fprintf(stderr, "%s\n%s\n%s\n%s\n", 206 "usage: kill [-s signal_name] pid ...", 207 " kill -l [exit_status]", 208 " kill -signal_name pid ...", 209 " kill -signal_number pid ..."); 210 #ifdef SHELL 211 error(NULL); 212 #else 213 exit(2); 214 #endif 215 } 216