bin/kill/kill.c

   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 }