bin/kill/kill.c

   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. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * @(#) Copyright (c) 1988, 1993, 1994 The Regents of the University of California.  All rights reserved.
  30  * @(#)kill.c   8.4 (Berkeley) 4/28/95
  31  * $FreeBSD: src/bin/kill/kill.c,v 1.24 2011/02/04 16:40:50 jilles Exp $
  32  */
  33
  34 #include <ctype.h>
  35 #include <err.h>
  36 #include <errno.h>
  37 #include <signal.h>
  38 #include <stdio.h>
  39 #include <stdlib.h>
  40 #include <string.h>
  41
  42 #ifdef SHELL
  43 #define main killcmd
  44 #include "bltin/bltin.h"
  45 #include "error.h"
  46 #endif
  47
  48 static void     nosig(const char *);
  49 static void     printsignals(FILE *);
  50 static int      signame_to_signum(const char *);
  51 static void     usage(void);
  52
  53 int
  54 main(int argc, char **argv)
  55 {
  56         int errors, numsig;
  57         pid_t pid;
  58         char *ep;
  59
  60         if (argc < 2)
  61                 usage();
  62
  63         numsig = SIGTERM;
  64
  65         argc--, argv++;
  66         if (strcmp(*argv, "-l") == 0) {
  67                 argc--, argv++;
  68                 if (argc > 1)
  69                         usage();
  70                 if (argc == 1) {
  71                         if (!isdigit(**argv))
  72                                 usage();
  73                         numsig = strtol(*argv, &ep, 10);
  74                         if (**argv == '\0' || *ep != '\0')
  75                                 errx(2, "illegal signal number: %s", *argv);
  76                         if (numsig >= 128)
  77                                 numsig -= 128;
  78                         if (numsig <= 0 || numsig >= sys_nsig)
  79                                 nosig(*argv);
  80                         printf("%s\n", sys_signame[numsig]);
  81                         return (0);
  82                 }
  83                 printsignals(stdout);
  84                 return (0);
  85         }
  86
  87         if (strcmp(*argv, "-s") == 0) {
  88                 argc--, argv++;
  89                 if (argc < 1) {
  90                         warnx("option requires an argument -- s");
  91                         usage();
  92                 }
  93                 if (strcmp(*argv, "0") != 0) {
  94                         if ((numsig = signame_to_signum(*argv)) < 0)
  95                                 nosig(*argv);
  96                 } else
  97                         numsig = 0;
  98                 argc--, argv++;
  99         } else if (**argv == '-' && *(*argv + 1) != '-') {
 100                 ++*argv;
 101                 if (isalpha(**argv)) {
 102                         if ((numsig = signame_to_signum(*argv)) < 0)
 103                                 nosig(*argv);
 104                 } else if (isdigit(**argv)) {
 105                         numsig = strtol(*argv, &ep, 10);
 106                         if (**argv == '\0' || *ep != '\0')
 107                                 errx(2, "illegal signal number: %s", *argv);
 108                         if (numsig < 0)
 109                                 nosig(*argv);
 110                 } else
 111                         nosig(*argv);
 112                 argc--, argv++;
 113         }
 114
 115         if (argc > 0 && strncmp(*argv, "--", 2) == 0)
 116                 argc--, argv++;
 117
 118         if (argc == 0)
 119                 usage();
 120
 121         for (errors = 0; argc; argc--, argv++) {
 122 #ifdef SHELL
 123                 if (**argv == '%')
 124                         pid = killjob(*argv, numsig);
 125                 else
 126 #endif
 127                 {
 128                         pid = (pid_t)strtol(*argv, &ep, 10);
 129                         if (**argv == '\0' || *ep != '\0')
 130                                 errx(2, "illegal process id: %s", *argv);
 131                 }
 132                 if (kill(pid, numsig) == -1) {
 133                         warn("%s", *argv);
 134                         errors = 1;
 135                 }
 136         }
 137
 138         return (errors);
 139 }
 140
 141 static int
 142 signame_to_signum(const char *sig)
 143 {
 144         int n;
 145
 146         if (strncasecmp(sig, "SIG", 3) == 0)
 147                 sig += 3;
 148         for (n = 1; n < sys_nsig; n++) {
 149                 if (strcasecmp(sys_signame[n], sig) == 0)
 150                         return(n);
 151         }
 152         return(-1);
 153 }
 154
 155 static void
 156 nosig(const char *name)
 157 {
 158         warnx("unknown signal %s; valid signals:", name);
 159         printsignals(stderr);
 160 #ifdef SHELL
 161         error(NULL);
 162 #else
 163         exit(2);
 164 #endif
 165 }
 166
 167 static void
 168 printsignals(FILE *fp)
 169 {
 170         int n;
 171
 172         for (n = 1; n < sys_nsig; n++) {
 173                 fprintf(fp, "%s", sys_signame[n]);
 174                 if (n == (sys_nsig / 2) || n == (sys_nsig - 1))
 175                         fprintf(fp, "\n");
 176                 else
 177                         fprintf(fp, " ");
 178         }
 179 }
 180
 181 static void
 182 usage(void)
 183 {
 184         fprintf(stderr, "%s\n%s\n%s\n%s\n",
 185                 "usage: kill [-s signal_name] pid ...",
 186                 "       kill -l [exit_status]",
 187                 "       kill -signal_name pid ...",
 188                 "       kill -signal_number pid ...");
 189 #ifdef SHELL
 190         error(NULL);
 191 #else
 192         exit(2);
 193 #endif
 194 }