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  * 4. 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 /*
  30  * Important: This file is used both as a standalone program /bin/kill and
  31  * as a builtin for /bin/sh (#define SHELL).
  32  */
  33
  34 #if 0
  35 #ifndef lint
  36 static char const copyright[] =
  37 "@(#) Copyright (c) 1988, 1993, 1994\n\
  38         The Regents of the University of California.  All rights reserved.\n";
  39 #endif /* not lint */
  40
  41 #ifndef lint
  42 static char sccsid[] = "@(#)kill.c      8.4 (Berkeley) 4/28/95";
  43 #endif /* not lint */
  44 #endif
  45 #include <sys/cdefs.h>
  46 __FBSDID("$FreeBSD$");
  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 #ifdef SHELL
  57 #define main killcmd
  58 #include "bltin/bltin.h"
  59 #endif
  60
  61 static void nosig(const char *);
  62 static void printsignals(FILE *);
  63 static int signame_to_signum(const char *);
  64 static void usage(void);
  65
  66 #ifdef __APPLE__
  67 #define sys_nsig NSIG
  68 #endif /* __APPLE__ */
  69
  70 int
  71 main(int argc, char *argv[])
  72 {
  73         int errors, numsig, pid, ret;
  74         char *ep;
  75
  76         if (argc < 2)
  77                 usage();
  78
  79         numsig = SIGTERM;
  80
  81         argc--, argv++;
  82         if (!strcmp(*argv, "-l")) {
  83                 argc--, argv++;
  84                 if (argc > 1)
  85                         usage();
  86                 if (argc == 1) {
  87                         if (!isdigit(**argv))
  88                                 usage();
  89                         numsig = strtol(*argv, &ep, 10);
  90                         if (!**argv || *ep)
  91                                 errx(2, "illegal signal number: %s", *argv);
  92                         if (numsig >= 128)
  93                                 numsig -= 128;
  94                         if (numsig <= 0 || numsig >= sys_nsig)
  95                                 nosig(*argv);
  96                         printf("%s\n", sys_signame[numsig]);
  97                         return (0);
  98                 }
  99                 printsignals(stdout);
 100                 return (0);
 101         }
 102
 103         if (!strcmp(*argv, "-s")) {
 104                 argc--, argv++;
 105                 if (argc < 1) {
 106                         warnx("option requires an argument -- s");
 107                         usage();
 108                 }
 109                 if (strcmp(*argv, "0")) {
 110                         if ((numsig = signame_to_signum(*argv)) < 0)
 111                                 nosig(*argv);
 112                 } else
 113                         numsig = 0;
 114                 argc--, argv++;
 115         } else if (**argv == '-' && *(*argv + 1) != '-') {
 116                 ++*argv;
 117                 if (isalpha(**argv)) {
 118                         if ((numsig = signame_to_signum(*argv)) < 0)
 119                                 nosig(*argv);
 120                 } else if (isdigit(**argv)) {
 121                         numsig = strtol(*argv, &ep, 10);
 122                         if (!**argv || *ep)
 123                                 errx(2, "illegal signal number: %s", *argv);
 124                         if (numsig < 0)
 125                                 nosig(*argv);
 126                 } else
 127                         nosig(*argv);
 128                 argc--, argv++;
 129         }
 130
 131         if (argc > 0 && strncmp(*argv, "--", 2) == 0)
 132                 argc--, argv++;
 133
 134         if (argc == 0)
 135                 usage();
 136
 137         for (errors = 0; argc; argc--, argv++) {
 138 #ifdef SHELL
 139                 if (**argv == '%')
 140                         ret = killjob(*argv, numsig);
 141                 else
 142 #endif
 143                 {
 144                         pid = strtol(*argv, &ep, 10);
 145                         if (!**argv || *ep)
 146                                 errx(2, "illegal process id: %s", *argv);
 147                         ret = kill(pid, numsig);
 148                 }
 149                 if (ret == -1) {
 150                         warn("%s", *argv);
 151                         errors = 1;
 152                 }
 153         }
 154
 155         return (errors);
 156 }
 157
 158 static int
 159 signame_to_signum(const char *sig)
 160 {
 161         int n;
 162
 163         if (strncasecmp(sig, "SIG", 3) == 0)
 164                 sig += 3;
 165         for (n = 1; n < sys_nsig; n++) {
 166                 if (!strcasecmp(sys_signame[n], sig))
 167                         return (n);
 168         }
 169         return (-1);
 170 }
 171
 172 static void
 173 nosig(const char *name)
 174 {
 175
 176         warnx("unknown signal %s; valid signals:", name);
 177         printsignals(stderr);
 178 #ifdef SHELL
 179         error(NULL);
 180 #else
 181         exit(2);
 182 #endif
 183 }
 184
 185 static void
 186 printsignals(FILE *fp)
 187 {
 188         int n;
 189
 190         for (n = 1; n < sys_nsig; n++) {
 191                 (void)fprintf(fp, "%s", sys_signame[n]);
 192                 if (n == (sys_nsig / 2) || n == (sys_nsig - 1))
 193                         (void)fprintf(fp, "\n");
 194                 else
 195                         (void)fprintf(fp, " ");
 196         }
 197 }
 198
 199 static void
 200 usage(void)
 201 {
 202
 203         (void)fprintf(stderr, "%s\n%s\n%s\n%s\n",
 204                 "usage: kill [-s signal_name] pid ...",
 205                 "       kill -l [exit_status]",
 206                 "       kill -signal_name pid ...",
 207                 "       kill -signal_number pid ...");
 208 #ifdef SHELL
 209         error(NULL);
 210 #else
 211         exit(2);
 212 #endif
 213 }