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 1.24 2011/02/04 16:40:50 jilles Exp $
  36  */
  37
  38 #include <ctype.h>
  39 #include <err.h>
  40 #include <errno.h>
  41 #include <signal.h>
  42 #include <stdio.h>
  43 #include <stdlib.h>
  44 #include <string.h>
  45
  46 #ifdef SHELL
  47 #define main killcmd
  48 #include "bltin/bltin.h"
  49 #include "error.h"
  50 #endif
  51
  52 static void     nosig(const char *);
  53 static void     printsignals(FILE *);
  54 static int      signame_to_signum(const char *);
  55 static void     usage(void);
  56
  57 int
  58 main(int argc, char **argv)
  59 {
  60         int errors, numsig;
  61         pid_t pid;
  62         char *ep;
  63
  64         if (argc < 2)
  65                 usage();
  66
  67         numsig = SIGTERM;
  68
  69         argc--, argv++;
  70         if (strcmp(*argv, "-l") == 0) {
  71                 argc--, argv++;
  72                 if (argc > 1)
  73                         usage();
  74                 if (argc == 1) {
  75                         if (!isdigit(**argv))
  76                                 usage();
  77                         numsig = strtol(*argv, &ep, 10);
  78                         if (**argv == '\0' || *ep != '\0')
  79                                 errx(2, "illegal signal number: %s", *argv);
  80                         if (numsig >= 128)
  81                                 numsig -= 128;
  82                         if (numsig <= 0 || numsig >= sys_nsig)
  83                                 nosig(*argv);
  84                         printf("%s\n", sys_signame[numsig]);
  85                         return (0);
  86                 }
  87                 printsignals(stdout);
  88                 return (0);
  89         }
  90
  91         if (strcmp(*argv, "-s") == 0) {
  92                 argc--, argv++;
  93                 if (argc < 1) {
  94                         warnx("option requires an argument -- s");
  95                         usage();
  96                 }
  97                 if (strcmp(*argv, "0") != 0) {
  98                         if ((numsig = signame_to_signum(*argv)) < 0)
  99                                 nosig(*argv);
 100                 } else
 101                         numsig = 0;
 102                 argc--, argv++;
 103         } else if (**argv == '-' && *(*argv + 1) != '-') {
 104                 ++*argv;
 105                 if (isalpha(**argv)) {
 106                         if ((numsig = signame_to_signum(*argv)) < 0)
 107                                 nosig(*argv);
 108                 } else if (isdigit(**argv)) {
 109                         numsig = strtol(*argv, &ep, 10);
 110                         if (**argv == '\0' || *ep != '\0')
 111                                 errx(2, "illegal signal number: %s", *argv);
 112                         if (numsig < 0)
 113                                 nosig(*argv);
 114                 } else
 115                         nosig(*argv);
 116                 argc--, argv++;
 117         }
 118
 119         if (argc > 0 && strncmp(*argv, "--", 2) == 0)
 120                 argc--, argv++;
 121
 122         if (argc == 0)
 123                 usage();
 124
 125         for (errors = 0; argc; argc--, argv++) {
 126 #ifdef SHELL
 127                 if (**argv == '%')
 128                         pid = getjobpgrp(*argv);
 129                 else
 130 #endif
 131                 {
 132                         pid = (pid_t)strtol(*argv, &ep, 10);
 133                         if (**argv == '\0' || *ep != '\0')
 134                                 errx(2, "illegal process id: %s", *argv);
 135                 }
 136                 if (kill(pid, numsig) == -1) {
 137                         warn("%s", *argv);
 138                         errors = 1;
 139                 }
 140         }
 141
 142         return (errors);
 143 }
 144
 145 static int
 146 signame_to_signum(const char *sig)
 147 {
 148         int n;
 149
 150         if (strncasecmp(sig, "SIG", 3) == 0)
 151                 sig += 3;
 152         for (n = 1; n < sys_nsig; n++) {
 153                 if (strcasecmp(sys_signame[n], sig) == 0)
 154                         return(n);
 155         }
 156         return(-1);
 157 }
 158
 159 static void
 160 nosig(const char *name)
 161 {
 162         warnx("unknown signal %s; valid signals:", name);
 163         printsignals(stderr);
 164 #ifdef SHELL
 165         error(NULL);
 166 #else
 167         exit(2);
 168 #endif
 169 }
 170
 171 static void
 172 printsignals(FILE *fp)
 173 {
 174         int n;
 175
 176         for (n = 1; n < sys_nsig; n++) {
 177                 fprintf(fp, "%s", sys_signame[n]);
 178                 if (n == (sys_nsig / 2) || n == (sys_nsig - 1))
 179                         fprintf(fp, "\n");
 180                 else
 181                         fprintf(fp, " ");
 182         }
 183 }
 184
 185 static void
 186 usage(void)
 187 {
 188         fprintf(stderr, "%s\n%s\n%s\n%s\n",
 189                 "usage: kill [-s signal_name] pid ...",
 190                 "       kill -l [exit_status]",
 191                 "       kill -signal_name pid ...",
 192                 "       kill -signal_number pid ...");
 193 #ifdef SHELL
 194         error(NULL);
 195 #else
 196         exit(2);
 197 #endif
 198 }