kill.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * Mini kill/killall implementation for busybox
   4  *
   5  * Copyright (C) 1995, 1996 by Bruce Perens <bruce@pixar.com>.
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  15  * General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  20  *
  21  */
  22
  23
  24 #include "internal.h"
  25 #include <stdio.h>
  26 #include <stdlib.h>
  27 #include <errno.h>
  28 #include <unistd.h>
  29 #include <signal.h>
  30 #include <ctype.h>
  31 #include <sys/stat.h>
  32 #include <unistd.h>
  33
  34 static const char *kill_usage =
  35         "kill [-signal] process-id [process-id ...]\n"
  36 #ifndef BB_FEATURE_TRIVIAL_HELP
  37         "\nSend a signal (default is SIGTERM) to the specified process(es).\n\n"
  38         "Options:\n" "\t-l\tList all signal names and numbers.\n\n"
  39 #endif
  40         ;
  41
  42 #ifdef BB_KILLALL
  43 static const char *killall_usage =
  44         "killall [-signal] process-name [process-name ...]\n"
  45 #ifndef BB_FEATURE_TRIVIAL_HELP
  46         "\nSend a signal (default is SIGTERM) to the specified process(es).\n\n"
  47         "Options:\n" "\t-l\tList all signal names and numbers.\n\n"
  48 #endif
  49 #endif
  50         ;
  51
  52 #define KILL    0
  53 #define KILLALL 1
  54
  55 struct signal_name {
  56         const char *name;
  57         int number;
  58 };
  59
  60 const struct signal_name signames[] = {
  61         /* Everything, order not important */
  62         {"HUP", SIGHUP},
  63         {"INT", SIGINT},
  64         {"QUIT", SIGQUIT},
  65         {"ILL", SIGILL},
  66         {"TRAP", SIGTRAP},
  67         {"ABRT", SIGABRT},
  68         {"FPE", SIGFPE},
  69         {"KILL", SIGKILL},
  70         {"SEGV", SIGSEGV},
  71         {"PIPE", SIGPIPE},
  72         {"ALRM", SIGALRM},
  73         {"TERM", SIGTERM},
  74         {"BUS", SIGBUS},
  75         {"USR1", SIGUSR1},
  76         {"USR2", SIGUSR2},
  77         {"STOP", SIGSTOP},
  78         {"CONT", SIGCONT},
  79         {"TTIN", SIGTTIN},
  80         {"TTOU", SIGTTOU},
  81         {"IO", SIGIO},
  82         {"TSTP", SIGTSTP},
  83         {"CHLD", SIGCHLD},
  84         {"XCPU", SIGXCPU},
  85         {"XFSZ", SIGXFSZ},
  86         {"PROF", SIGPROF},
  87         {"WINCH", SIGWINCH},
  88         {"URG", SIGURG},
  89         {"VTALRM", SIGVTALRM},
  90 #ifndef __alpha__
  91         /* everything except alpha */
  92         {"IOT", SIGIOT},
  93         {"POLL", SIGPOLL},
  94 #endif
  95 #if defined(__sparc__) || defined(__alpha__) || defined(__mips__)
  96         /* everthing except intel */
  97         {"EMT", SIGEMT},
  98         {"SYS", SIGSYS},
  99 # ifdef __alpha__
 100                 /* alpha only */
 101                 {"LOST", SIGLOST},
 102 #endif
 103 #ifdef __sparc__
 104                 /* space only */
 105                 {"INFO", SIGINFO},
 106 #endif
 107 #ifdef __mips__
 108                 /* mips only */
 109                 {"CLD", SIGCLD},
 110                 {"PWR", SIGPWR},
 111 #endif
 112 #else
 113         /* intel only */
 114         {"STKFLT", SIGSTKFLT},
 115         {"PWR", SIGPWR},
 116         {"UNUSED", SIGUNUSED},
 117 #endif
 118         {0, 0}
 119 };
 120
 121 extern int kill_main(int argc, char **argv)
 122 {
 123         int whichApp, sig = SIGTERM;
 124         const char *appUsage;
 125
 126 #ifdef BB_KILLALL
 127         /* Figure out what we are trying to do here */
 128         whichApp = (strcmp(*argv, "killall") == 0)?
 129                 KILLALL : KILL;
 130         appUsage = (whichApp == KILLALL)?  killall_usage : kill_usage;
 131 #else
 132         whichApp = KILL;
 133         appUsage = kill_usage;
 134 #endif
 135
 136         argc--;
 137         argv++;
 138         /* Parse any options */
 139         if (argc < 1)
 140                 usage(appUsage);
 141
 142         while (argc > 0 && **argv == '-') {
 143                 while (*++(*argv)) {
 144                         switch (**argv) {
 145                         case 'l':
 146                                 {
 147                                         int col = 0;
 148                                         const struct signal_name *s = signames;
 149
 150                                         while (s->name != 0) {
 151                                                 col +=
 152                                                         fprintf(stderr, "%2d) %-8s", s->number,
 153                                                                         (s++)->name);
 154                                                 if (col > 60) {
 155                                                         fprintf(stderr, "\n");
 156                                                         col = 0;
 157                                                 }
 158                                         }
 159                                         fprintf(stderr, "\n\n");
 160                                         exit(TRUE);
 161                                 }
 162                                 break;
 163                         case '-':
 164                                 usage(appUsage);
 165                         default:
 166                                 {
 167                                         if (isdigit(**argv)) {
 168                                                 sig = atoi(*argv);
 169                                                 if (sig < 0 || sig >= NSIG)
 170                                                         goto end;
 171                                                 else {
 172                                                         argc--;
 173                                                         argv++;
 174                                                         goto do_it_now;
 175                                                 }
 176                                         } else {
 177                                                 const struct signal_name *s = signames;
 178
 179                                                 while (s->name != 0) {
 180                                                         if (strcasecmp(s->name, *argv) == 0) {
 181                                                                 sig = s->number;
 182                                                                 argc--;
 183                                                                 argv++;
 184                                                                 goto do_it_now;
 185                                                         }
 186                                                         s++;
 187                                                 }
 188                                                 if (s->name == 0)
 189                                                         goto end;
 190                                         }
 191                                 }
 192                         }
 193                         argc--;
 194                         argv++;
 195                 }
 196         }
 197
 198   do_it_now:
 199
 200         if (whichApp == KILL) {
 201                 /* Looks like they want to do a kill. Do that */
 202                 while (--argc >= 0) {
 203                         int pid;
 204
 205                         if (!isdigit(**argv))
 206                                 fatalError( "Bad PID: %s\n", strerror(errno));
 207                         pid = strtol(*argv, NULL, 0);
 208                         if (kill(pid, sig) != 0)
 209                                 fatalError( "Could not kill pid '%d': %s\n", pid, strerror(errno));
 210                         argv++;
 211                 }
 212         }
 213 #ifdef BB_KILLALL
 214         else {
 215                 int all_found = TRUE;
 216                 pid_t myPid=getpid();
 217                 /* Looks like they want to do a killall.  Do that */
 218                 while (--argc >= 0) {
 219                         pid_t* pidList;
 220
 221                         pidList = findPidByName( *argv);
 222                         if (!pidList) {
 223                                 all_found = FALSE;
 224                                 errorMsg( "%s: no process killed\n", *argv);
 225                         }
 226
 227                         for(; pidList && *pidList!=0; pidList++) {
 228                                 if (*pidList==myPid)
 229                                         continue;
 230                                 if (kill(*pidList, sig) != 0)
 231                                         fatalError( "Could not kill pid '%d': %s\n", *pidList, strerror(errno));
 232                         }
 233                         /* Note that we don't bother to free the memory
 234                          * allocated in findPidByName().  It will be freed
 235                          * upon exit, so we can save a byte or two */
 236                         argv++;
 237                 }
 238                 exit (all_found);
 239         }
 240 #endif
 241
 242         exit(TRUE);
 243
 244
 245   end:
 246         fatalError( "bad signal name: %s\n", *argv);
 247 }