bin/kill/kill.c

   1 /* $NetBSD: kill.c,v 1.27 2011/08/29 14:51:18 joerg Exp $ */
   2
   3 /*
   4  * Copyright (c) 1988, 1993, 1994
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 #include <sys/cdefs.h>
  33 #if !defined(lint) && !defined(SHELL)
  34 __COPYRIGHT("@(#) Copyright (c) 1988, 1993, 1994\
  35  The Regents of the University of California.  All rights reserved.");
  36 #endif /* not lint */
  37
  38 #ifndef lint
  39 #if 0
  40 static char sccsid[] = "@(#)kill.c      8.4 (Berkeley) 4/28/95";
  41 #else
  42 __RCSID("$NetBSD: kill.c,v 1.27 2011/08/29 14:51:18 joerg Exp $");
  43 #endif
  44 #endif /* not lint */
  45
  46 #include <ctype.h>
  47 #include <err.h>
  48 #include <errno.h>
  49 #include <signal.h>
  50 #include <stdio.h>
  51 #include <stdlib.h>
  52 #include <limits.h>
  53 #include <inttypes.h>
  54 #include <string.h>
  55 #include <termios.h>
  56 #include <unistd.h>
  57 #include <locale.h>
  58 #include <sys/ioctl.h>
  59
  60 #ifdef SHELL            /* sh (aka ash) builtin */
  61 int killcmd(int, char *argv[]);
  62 #define main killcmd
  63 #include "../../bin/sh/bltin/bltin.h"
  64 #endif /* SHELL */
  65
  66 __dead static void nosig(char *);
  67 static void printsignals(FILE *);
  68 static int signame_to_signum(char *);
  69 __dead static void usage(void);
  70
  71 int
  72 main(int argc, char *argv[])
  73 {
  74         int errors;
  75         intmax_t numsig, pid;
  76         char *ep;
  77
  78         setprogname(argv[0]);
  79         setlocale(LC_ALL, "");
  80         if (argc < 2)
  81                 usage();
  82
  83         numsig = SIGTERM;
  84
  85         argc--, argv++;
  86         if (strcmp(*argv, "-l") == 0) {
  87                 argc--, argv++;
  88                 if (argc > 1)
  89                         usage();
  90                 if (argc == 1) {
  91                         if (isdigit((unsigned char)**argv) == 0)
  92                                 usage();
  93                         numsig = strtoimax(*argv, &ep, 10);
  94                         /* check for correctly parsed number */
  95                         if (*ep != '\0' || numsig == INTMAX_MIN || numsig == INTMAX_MAX) {
  96                                 errx(EXIT_FAILURE, "illegal signal number: %s",
  97                                                 *argv);
  98                                 /* NOTREACHED */
  99                         }
 100                         if (numsig >= 128)
 101                                 numsig -= 128;
 102                         /* and whether it fits into signals range */
 103                         if (numsig <= 0 || numsig >= NSIG)
 104                                 nosig(*argv);
 105                         printf("%s\n", sys_signame[(int) numsig]);
 106                         exit(0);
 107                 }
 108                 printsignals(stdout);
 109                 exit(0);
 110         }
 111
 112         if (!strcmp(*argv, "-s")) {
 113                 argc--, argv++;
 114                 if (argc < 1) {
 115                         warnx("option requires an argument -- s");
 116                         usage();
 117                 }
 118                 if (strcmp(*argv, "0")) {
 119                         if ((numsig = signame_to_signum(*argv)) < 0)
 120                                 nosig(*argv);
 121                 } else
 122                         numsig = 0;
 123                 argc--, argv++;
 124         } else if (**argv == '-') {
 125                 char *sn = *argv + 1;
 126                 if (isalpha((unsigned char)*sn)) {
 127                         if ((numsig = signame_to_signum(sn)) < 0)
 128                                 nosig(sn);
 129                 } else if (isdigit((unsigned char)*sn)) {
 130                         numsig = strtoimax(sn, &ep, 10);
 131                         /* check for correctly parsed number */
 132                         if (*ep || numsig == INTMAX_MIN || numsig == INTMAX_MAX ) {
 133                                 errx(EXIT_FAILURE, "illegal signal number: %s",
 134                                                 sn);
 135                                 /* NOTREACHED */
 136                         }
 137                         /* and whether it fits into signals range */
 138                         if (numsig < 0 || numsig >= NSIG)
 139                                 nosig(sn);
 140                 } else
 141                         nosig(sn);
 142                 argc--, argv++;
 143         }
 144
 145         if (argc == 0)
 146                 usage();
 147
 148         for (errors = 0; argc; argc--, argv++) {
 149 #ifdef SHELL
 150                 extern int getjobpgrp(const char *);
 151                 if (*argv[0] == '%') {
 152                         pid = getjobpgrp(*argv);
 153                         if (pid == 0) {
 154                                 warnx("illegal job id: %s", *argv);
 155                                 errors = 1;
 156                                 continue;
 157                         }
 158                 } else
 159 #endif
 160                 {
 161                         pid = strtoimax(*argv, &ep, 10);
 162                         /* make sure the pid is a number and fits into pid_t */
 163                         if (!**argv || *ep || pid == INTMAX_MIN ||
 164                                 pid == INTMAX_MAX || pid != (pid_t) pid) {
 165
 166                                 warnx("illegal process id: %s", *argv);
 167                                 errors = 1;
 168                                 continue;
 169                         }
 170                 }
 171                 if (kill((pid_t) pid, (int) numsig) == -1) {
 172                         warn("%s", *argv);
 173                         errors = 1;
 174                 }
 175 #ifdef SHELL
 176                 /* Wakeup the process if it was suspended, so it can
 177                    exit without an explicit 'fg'. */
 178                 if (numsig == SIGTERM || numsig == SIGHUP)
 179                         kill((pid_t) pid, SIGCONT);
 180 #endif
 181         }
 182
 183         exit(errors);
 184         /* NOTREACHED */
 185 }
 186
 187 static int
 188 signame_to_signum(char *sig)
 189 {
 190         int n;
 191
 192         if (strncasecmp(sig, "sig", 3) == 0)
 193                 sig += 3;
 194         for (n = 1; n < NSIG; n++) {
 195                 if (!strcasecmp(sys_signame[n], sig))
 196                         return (n);
 197         }
 198         return (-1);
 199 }
 200
 201 static void
 202 nosig(char *name)
 203 {
 204
 205         warnx("unknown signal %s; valid signals:", name);
 206         printsignals(stderr);
 207         exit(1);
 208         /* NOTREACHED */
 209 }
 210
 211 static void
 212 printsignals(FILE *fp)
 213 {
 214         int sig;
 215         int len, nl;
 216         const char *name;
 217         int termwidth = 80;
 218
 219         if (isatty(fileno(fp))) {
 220                 struct winsize win;
 221                 if (ioctl(fileno(fp), TIOCGWINSZ, &win) == 0 && win.ws_col > 0)
 222                         termwidth = win.ws_col;
 223         }
 224
 225         for (len = 0, sig = 1; sig < NSIG; sig++) {
 226                 name = sys_signame[sig];
 227                 nl = 1 + strlen(name);
 228
 229                 if (len + nl >= termwidth) {
 230                         fprintf(fp, "\n");
 231                         len = 0;
 232                 } else
 233                         if (len != 0)
 234                                 fprintf(fp, " ");
 235                 len += nl;
 236                 fprintf(fp, "%s", name);
 237         }
 238         if (len != 0)
 239                 fprintf(fp, "\n");
 240 }
 241
 242 static void
 243 usage(void)
 244 {
 245
 246         fprintf(stderr, "usage: %s [-s signal_name] pid ...\n"
 247             "       %s -l [exit_status]\n"
 248             "       %s -signal_name pid ...\n"
 249             "       %s -signal_number pid ...\n",
 250             getprogname(), getprogname(), getprogname(), getprogname());
 251         exit(1);
 252         /* NOTREACHED */
 253 }