bin/kill/kill.c

   1 /*      $OpenBSD: kill.c,v 1.14 2017/03/29 22:40:15 millert Exp $       */
   2 /*      $NetBSD: kill.c,v 1.11 1995/09/07 06:30:27 jtc Exp $    */
   3
   4 /*
   5  * Copyright (c) 1988, 1993, 1994
   6  *      The Regents of the University of California.  All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. Neither the name of the University nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  */
  32
  33 #include <ctype.h>
  34 #include <err.h>
  35 #include <errno.h>
  36 #include <limits.h>
  37 #include <signal.h>
  38 #include <stdio.h>
  39 #include <stdlib.h>
  40 #include <string.h>
  41 #include <unistd.h>
  42
  43 extern  char *__progname;
  44 extern  char *const sys_signame[NSIG];
  45
  46 void nosig(char *);
  47 void printsignals(FILE *);
  48 int signame_to_signum(char *);
  49 void usage(void);
  50
  51 int
  52 main(int argc, char *argv[])
  53 {
  54         int errors, numsig, pid;
  55         const char *errstr;
  56
  57         if (pledge("stdio proc", NULL) == -1)
  58                 err(1, "pledge");
  59
  60         if (argc < 2)
  61                 usage();
  62
  63         numsig = SIGTERM;
  64
  65         argc--, argv++;
  66         if (!strcmp(*argv, "-l")) {
  67                 argc--, argv++;
  68                 if (argc > 0 && !strcmp(*argv, "--"))
  69                         argc--, argv++;
  70                 if (argc > 1)
  71                         usage();
  72                 if (argc == 1) {
  73                         if (!isdigit((unsigned char)**argv))
  74                                 usage();
  75                         numsig = strtonum(*argv, 1, NSIG + 127, &errstr);
  76                         if (errstr != NULL) {
  77                                 if (errno == ERANGE)
  78                                         nosig(*argv);
  79                                 errx(1, "illegal signal number: %s", *argv);
  80                         }
  81                         printf("%s\n", sys_signame[numsig & 127]);
  82                         exit(0);
  83                 }
  84                 printsignals(stdout);
  85                 exit(0);
  86         }
  87
  88         if (!strcmp(*argv, "-s")) {
  89                 argc--, argv++;
  90                 if (argc > 0 && !strcmp(*argv, "--"))
  91                         argc--, argv++;
  92                 if (argc < 1) {
  93                         warnx("option requires an argument -- s");
  94                         usage();
  95                 }
  96                 if (strcmp(*argv, "0")) {
  97                         if ((numsig = signame_to_signum(*argv)) < 0)
  98                                 nosig(*argv);
  99                 } else
 100                         numsig = 0;
 101                 argc--, argv++;
 102         } else if (**argv == '-') {
 103                 if (strcmp(*argv, "--")) {
 104                         ++*argv;
 105                         if (isalpha((unsigned char)**argv)) {
 106                                 if ((numsig = signame_to_signum(*argv)) < 0)
 107                                         nosig(*argv);
 108                         } else if (isdigit((unsigned char)**argv)) {
 109                                 numsig = strtonum(*argv, 0, NSIG - 1, &errstr);
 110                                 if (errstr != NULL) {
 111                                         if (errno == ERANGE)
 112                                                 nosig(*argv);
 113                                         errx(1, "illegal signal number: %s", *argv);
 114                                 }
 115                         } else
 116                                 nosig(*argv);
 117                 }
 118                 argc--, argv++;
 119         }
 120
 121         if (argc == 0)
 122                 usage();
 123
 124         for (errors = 0; argc; argc--, argv++) {
 125                 pid = strtonum(*argv, -INT_MAX, INT_MAX, &errstr);
 126                 if (errstr != NULL) {
 127                         warnx("illegal process id: %s", *argv);
 128                         errors = 1;
 129                 } else if (kill(pid, numsig) == -1) {
 130                         warn("%s", *argv);
 131                         errors = 1;
 132                 }
 133         }
 134
 135         exit(errors);
 136 }
 137
 138 int
 139 signame_to_signum(char *sig)
 140 {
 141         int n;
 142
 143         if (!strncasecmp(sig, "sig", 3))
 144                 sig += 3;
 145         for (n = 1; n < NSIG; n++) {
 146                 if (!strcasecmp(sys_signame[n], sig))
 147                         return (n);
 148         }
 149         return (-1);
 150 }
 151
 152 void
 153 nosig(char *name)
 154 {
 155
 156         warnx("unknown signal %s; valid signals:", name);
 157         printsignals(stderr);
 158         exit(1);
 159 }
 160
 161 void
 162 printsignals(FILE *fp)
 163 {
 164         int n;
 165
 166         for (n = 1; n < NSIG; n++) {
 167                 (void)fprintf(fp, "%s", sys_signame[n]);
 168                 if (n == (NSIG / 2) || n == (NSIG - 1))
 169                         (void)fprintf(fp, "\n");
 170                 else
 171                         (void)fprintf(fp, " ");
 172         }
 173 }
 174
 175 void
 176 usage(void)
 177 {
 178         (void)fprintf(stderr, "usage: %s [-s signal_name] pid ...\n",
 179             __progname);
 180         (void)fprintf(stderr, "       %s -l [exit_status]\n", __progname);
 181         (void)fprintf(stderr, "       %s -signal_name pid ...\n",
 182             __progname);
 183         (void)fprintf(stderr, "       %s -signal_number pid ...\n",
 184             __progname);
 185         exit(1);
 186 }