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
  34 #ifndef lint
  35 static char const copyright[] =
  36 "@(#) Copyright (c) 1988, 1993, 1994\n\
  37         The Regents of the University of California.  All rights reserved.\n";
  38 #endif /* not lint */
  39
  40 #ifndef lint
  41 #if 0
  42 static char sccsid[] = "@(#)kill.c      8.4 (Berkeley) 4/28/95";
  43 #endif
  44 static const char rcsid[] =
  45   "$FreeBSD: src/bin/kill/kill.c,v 1.11.2.1 2001/08/01 02:42:56 obrien Exp $";
  46 #endif /* not lint */
  47
  48 #include <ctype.h>
  49 #include <err.h>
  50 #include <errno.h>
  51 #include <signal.h>
  52 #include <stdio.h>
  53 #include <stdlib.h>
  54 #include <string.h>
  55
  56 int main __P((int, char *[]));
  57 void nosig __P((char *));
  58 void printsignals __P((FILE *));
  59 int signame_to_signum __P((char *));
  60 void usage __P((void));
  61
  62 int
  63 main(argc, argv)
  64         int argc;
  65         char *argv[];
  66 {
  67         int errors, numsig, pid;
  68         char *ep;
  69
  70         if (argc < 2)
  71                 usage();
  72
  73         numsig = SIGTERM;
  74
  75         argc--, argv++;
  76         if (!strcmp(*argv, "-l")) {
  77                 argc--, argv++;
  78                 if (argc > 1)
  79                         usage();
  80                 if (argc == 1) {
  81                         if (!isdigit(**argv))
  82                                 usage();
  83                         numsig = strtol(*argv, &ep, 10);
  84                         if (!**argv || *ep)
  85                                 errx(1, "illegal signal number: %s", *argv);
  86                         if (numsig >= 128)
  87                                 numsig -= 128;
  88                         if (numsig <= 0 || numsig >= NSIG)
  89                                 nosig(*argv);
  90                         printf("%s\n", sys_signame[numsig]);
  91                         exit(0);
  92                 }
  93                 printsignals(stdout);
  94                 exit(0);
  95         }
  96
  97         if (!strcmp(*argv, "-s")) {
  98                 argc--, argv++;
  99                 if (argc < 1) {
 100                         warnx("option requires an argument -- s");
 101                         usage();
 102                 }
 103                 if (strcmp(*argv, "0")) {
 104                         if ((numsig = signame_to_signum(*argv)) < 0)
 105                                 nosig(*argv);
 106                 } else
 107                         numsig = 0;
 108                 argc--, argv++;
 109         } else if (**argv == '-') {
 110                 ++*argv;
 111                 if (isalpha(**argv)) {
 112                         if ((numsig = signame_to_signum(*argv)) < 0)
 113                                 nosig(*argv);
 114                 } else if (isdigit(**argv)) {
 115                         numsig = strtol(*argv, &ep, 10);
 116                         if (!**argv || *ep)
 117                                 errx(1, "illegal signal number: %s", *argv);
 118                         if (numsig < 0 || numsig >= NSIG)
 119                                 nosig(*argv);
 120                 } else
 121                         nosig(*argv);
 122                 argc--, argv++;
 123         }
 124
 125         if (argc == 0)
 126                 usage();
 127
 128         for (errors = 0; argc; argc--, argv++) {
 129                 pid = strtol(*argv, &ep, 10);
 130                 if (!**argv || *ep) {
 131                         warnx("illegal process id: %s", *argv);
 132                         errors = 1;
 133                 } else if (kill(pid, numsig) == -1) {
 134                         warn("%s", *argv);
 135                         errors = 1;
 136                 }
 137         }
 138
 139         exit(errors);
 140 }
 141
 142 int
 143 signame_to_signum(sig)
 144         char *sig;
 145 {
 146         int n;
 147
 148         if (!strncasecmp(sig, "sig", (size_t)3))
 149                 sig += 3;
 150         for (n = 1; n < NSIG; n++) {
 151                 if (!strcasecmp(sys_signame[n], sig))
 152                         return (n);
 153         }
 154         return (-1);
 155 }
 156
 157 void
 158 nosig(name)
 159         char *name;
 160 {
 161
 162         warnx("unknown signal %s; valid signals:", name);
 163         printsignals(stderr);
 164         exit(1);
 165 }
 166
 167 void
 168 printsignals(fp)
 169         FILE *fp;
 170 {
 171         int n;
 172
 173         for (n = 1; n < NSIG; n++) {
 174                 (void)fprintf(fp, "%s", sys_signame[n]);
 175                 if (n == (NSIG / 2) || n == (NSIG - 1))
 176                         (void)fprintf(fp, "\n");
 177                 else
 178                         (void)fprintf(fp, " ");
 179         }
 180 }
 181
 182 void
 183 usage()
 184 {
 185
 186         (void)fprintf(stderr, "%s\n%s\n%s\n%s\n",
 187                 "usage: kill [-s signal_name] pid ...",
 188                 "       kill -l [exit_status]",
 189                 "       kill -signal_name pid ...",
 190                 "       kill -signal_number pid ...");
 191         exit(1);
 192 }