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. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  * @(#) Copyright (c) 1988, 1993, 1994 The Regents of the University of California.  All rights reserved.
  34  * @(#)kill.c   8.4 (Berkeley) 4/28/95
  35  * $FreeBSD: src/bin/kill/kill.c,v 1.11.2.2 2002/07/28 10:19:57 tjr Exp $
  36  * $DragonFly: src/bin/kill/kill.c,v 1.7 2005/03/05 19:41:38 liamfoy Exp $
  37  */
  38
  39 #include <ctype.h>
  40 #include <err.h>
  41 #include <signal.h>
  42 #include <stdio.h>
  43 #include <stdlib.h>
  44 #include <string.h>
  45
  46 static void     nosig(const char *);
  47 static void     printsignals(FILE *);
  48 static int      signame_to_signum(const char *);
  49 static void     usage(void);
  50
  51 int
  52 main(int argc, char **argv)
  53 {
  54         int errors, numsig;
  55         pid_t pid;
  56         char *ep;
  57
  58         if (argc < 2)
  59                 usage();
  60
  61         numsig = SIGTERM;
  62
  63         argc--, argv++;
  64         if (strcmp(*argv, "-l") == 0) {
  65                 argc--, argv++;
  66                 if (argc > 1)
  67                         usage();
  68                 if (argc == 1) {
  69                         if (!isdigit(**argv))
  70                                 usage();
  71                         numsig = strtol(*argv, &ep, 10);
  72                         if (**argv == '\0' || *ep != '\0')
  73                                 errx(1, "illegal signal number: %s", *argv);
  74                         if (numsig >= 128)
  75                                 numsig -= 128;
  76                         if (numsig <= 0 || numsig >= sys_nsig)
  77                                 nosig(*argv);
  78                         printf("%s\n", sys_signame[numsig]);
  79                         exit(0);
  80                 }
  81                 printsignals(stdout);
  82                 exit(0);
  83         }
  84
  85         if (strcmp(*argv, "-s") == 0) {
  86                 argc--, argv++;
  87                 if (argc < 1) {
  88                         warnx("option requires an argument -- s");
  89                         usage();
  90                 }
  91                 if (strcmp(*argv, "0") != 0) {
  92                         if ((numsig = signame_to_signum(*argv)) < 0)
  93                                 nosig(*argv);
  94                 } else
  95                         numsig = 0;
  96                 argc--, argv++;
  97         } else if (**argv == '-' && *(*argv + 1) != '-') {
  98                 ++*argv;
  99                 if (isalpha(**argv)) {
 100                         if ((numsig = signame_to_signum(*argv)) < 0)
 101                                 nosig(*argv);
 102                 } else if (isdigit(**argv)) {
 103                         numsig = strtol(*argv, &ep, 10);
 104                         if (**argv == '\0' || *ep != '\0')
 105                                 errx(1, "illegal signal number: %s", *argv);
 106                         if (numsig < 0 || numsig >= sys_nsig)
 107                                 nosig(*argv);
 108                 } else
 109                         nosig(*argv);
 110                 argc--, argv++;
 111         }
 112
 113         if (argc > 0 && strncmp(*argv, "--", 2) == 0)
 114                 argc--, argv++;
 115
 116         if (argc == 0)
 117                 usage();
 118
 119         for (errors = 0; argc; argc--, argv++) {
 120                 pid = (pid_t)strtol(*argv, &ep, 10);
 121                 if (**argv == '\0' || *ep != '\0') {
 122                         warnx("illegal process id: %s", *argv);
 123                         errors = 1;
 124                 } else if (kill(pid, numsig) == -1) {
 125                         warn("%s", *argv);
 126                         errors = 1;
 127                 }
 128         }
 129
 130         exit(errors);
 131 }
 132
 133 static int
 134 signame_to_signum(const char *sig)
 135 {
 136         int n;
 137
 138         if (strncasecmp(sig, "sig", 3) == 0)
 139                 sig += 3;
 140         for (n = 1; n < sys_nsig; n++) {
 141                 if (strcasecmp(sys_signame[n], sig) == 0)
 142                         return(n);
 143         }
 144         return(-1);
 145 }
 146
 147 static void
 148 nosig(const char *name)
 149 {
 150         warnx("unknown signal %s; valid signals:", name);
 151         printsignals(stderr);
 152         exit(1);
 153 }
 154
 155 static void
 156 printsignals(FILE *fp)
 157 {
 158         int n;
 159
 160         for (n = 1; n < sys_nsig; n++) {
 161                 fprintf(fp, "%s", sys_signame[n]);
 162                 if (n == (sys_nsig / 2) || n == (sys_nsig - 1))
 163                         fprintf(fp, "\n");
 164                 else
 165                         fprintf(fp, " ");
 166         }
 167 }
 168
 169 static void
 170 usage(void)
 171 {
 172         fprintf(stderr, "%s\n%s\n%s\n%s\n",
 173                 "usage: kill [-s signal_name] pid ...",
 174                 "       kill -l [exit_status]",
 175                 "       kill -signal_name pid ...",
 176                 "       kill -signal_number pid ...");
 177         exit(1);
 178 }