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 <stdio.h>
  25 #include <stdlib.h>
  26 #include <errno.h>
  27 #include <unistd.h>
  28 #include <signal.h>
  29 #include <ctype.h>
  30 #include <string.h>
  31 #include <unistd.h>
  32 #include "busybox.h"
  33
  34 static const int KILL = 0;
  35 static const int KILLALL = 1;
  36
  37 struct signal_name {
  38         const char *name;
  39         int number;
  40 };
  41
  42 static const struct signal_name signames[] = {
  43         /* POSIX signals */
  44         { "HUP",        SIGHUP },       /* 1 */
  45         { "INT",        SIGINT },       /* 2 */
  46         { "QUIT",       SIGQUIT },      /* 3 */
  47         { "ILL",        SIGILL },       /* 4 */
  48         { "ABRT",       SIGABRT },      /* 6 */
  49         { "FPE",        SIGFPE },       /* 8 */
  50         { "KILL",       SIGKILL },      /* 9 */
  51         { "SEGV",       SIGSEGV },      /* 11 */
  52         { "PIPE",       SIGPIPE },      /* 13 */
  53         { "ALRM",       SIGALRM },      /* 14 */
  54         { "TERM",       SIGTERM },      /* 15 */
  55         { "USR1",       SIGUSR1 },      /* 10 (arm,i386,m68k,ppc), 30 (alpha,sparc*), 16 (mips) */
  56         { "USR2",       SIGUSR2 },      /* 12 (arm,i386,m68k,ppc), 31 (alpha,sparc*), 17 (mips) */
  57         { "CHLD",       SIGCHLD },      /* 17 (arm,i386,m68k,ppc), 20 (alpha,sparc*), 18 (mips) */
  58         { "CONT",       SIGCONT },      /* 18 (arm,i386,m68k,ppc), 19 (alpha,sparc*), 25 (mips) */
  59         { "STOP",       SIGSTOP },      /* 19 (arm,i386,m68k,ppc), 17 (alpha,sparc*), 23 (mips) */
  60         { "TSTP",       SIGTSTP },      /* 20 (arm,i386,m68k,ppc), 18 (alpha,sparc*), 24 (mips) */
  61         { "TTIN",       SIGTTIN },      /* 21 (arm,i386,m68k,ppc,alpha,sparc*), 26 (mips) */
  62         { "TTOU",       SIGTTOU },      /* 22 (arm,i386,m68k,ppc,alpha,sparc*), 27 (mips) */
  63         /* Miscellaneous other signals */
  64 #ifdef SIGTRAP
  65         { "TRAP",       SIGTRAP },      /* 5 */
  66 #endif
  67 #ifdef SIGIOT
  68         { "IOT",        SIGIOT },       /* 6, same as SIGABRT */
  69 #endif
  70 #ifdef SIGEMT
  71         { "EMT",        SIGEMT },       /* 7 (mips,alpha,sparc*) */
  72 #endif
  73 #ifdef SIGBUS
  74         { "BUS",        SIGBUS },       /* 7 (arm,i386,m68k,ppc), 10 (mips,alpha,sparc*) */
  75 #endif
  76 #ifdef SIGSYS
  77         { "SYS",        SIGSYS },       /* 12 (mips,alpha,sparc*) */
  78 #endif
  79 #ifdef SIGSTKFLT
  80         { "STKFLT",     SIGSTKFLT },    /* 16 (arm,i386,m68k,ppc) */
  81 #endif
  82 #ifdef SIGURG
  83         { "URG",        SIGURG },       /* 23 (arm,i386,m68k,ppc), 16 (alpha,sparc*), 21 (mips) */
  84 #endif
  85 #ifdef SIGIO
  86         { "IO",         SIGIO },        /* 29 (arm,i386,m68k,ppc), 23 (alpha,sparc*), 22 (mips) */
  87 #endif
  88 #ifdef SIGPOLL
  89         { "POLL",       SIGPOLL },      /* same as SIGIO */
  90 #endif
  91 #ifdef SIGCLD
  92         { "CLD",        SIGCLD },       /* same as SIGCHLD (mips) */
  93 #endif
  94 #ifdef SIGXCPU
  95         { "XCPU",       SIGXCPU },      /* 24 (arm,i386,m68k,ppc,alpha,sparc*), 30 (mips) */
  96 #endif
  97 #ifdef SIGXFSZ
  98         { "XFSZ",       SIGXFSZ },      /* 25 (arm,i386,m68k,ppc,alpha,sparc*), 31 (mips) */
  99 #endif
 100 #ifdef SIGVTALRM
 101         { "VTALRM",     SIGVTALRM },    /* 26 (arm,i386,m68k,ppc,alpha,sparc*), 28 (mips) */
 102 #endif
 103 #ifdef SIGPROF
 104         { "PROF",       SIGPROF },      /* 27 (arm,i386,m68k,ppc,alpha,sparc*), 29 (mips) */
 105 #endif
 106 #ifdef SIGPWR
 107         { "PWR",        SIGPWR },       /* 30 (arm,i386,m68k,ppc), 29 (alpha,sparc*), 19 (mips) */
 108 #endif
 109 #ifdef SIGINFO
 110         { "INFO",       SIGINFO },      /* 29 (alpha) */
 111 #endif
 112 #ifdef SIGLOST
 113         { "LOST",       SIGLOST },      /* 29 (arm,i386,m68k,ppc,sparc*) */
 114 #endif
 115 #ifdef SIGWINCH
 116         { "WINCH",      SIGWINCH },     /* 28 (arm,i386,m68k,ppc,alpha,sparc*), 20 (mips) */
 117 #endif
 118 #ifdef SIGUNUSED
 119         { "UNUSED",     SIGUNUSED },    /* 31 (arm,i386,m68k,ppc) */
 120 #endif
 121         {0, 0}
 122 };
 123
 124 extern int kill_main(int argc, char **argv)
 125 {
 126         int whichApp, sig = SIGTERM;
 127
 128 #ifdef BB_KILLALL
 129         /* Figure out what we are trying to do here */
 130         whichApp = (strcmp(applet_name, "killall") == 0)? KILLALL : KILL;
 131 #else
 132         whichApp = KILL;
 133 #endif
 134
 135         argc--;
 136         argv++;
 137         /* Parse any options */
 138         if (argc < 1)
 139                 show_usage();
 140
 141         while (argc > 0 && **argv == '-') {
 142                 while (*++(*argv)) {
 143                         switch (**argv) {
 144                         case 'l':
 145                                 {
 146                                         int col = 0;
 147                                         const struct signal_name *s = signames;
 148
 149                                         while (s->name != 0) {
 150                                                 col += fprintf(stderr, "%2d) %-8s", s->number, s->name);
 151                                                 s++;
 152                                                 if (col > 60) {
 153                                                         fprintf(stderr, "\n");
 154                                                         col = 0;
 155                                                 }
 156                                         }
 157                                         fprintf(stderr, "\n\n");
 158                                         return EXIT_SUCCESS;
 159                                 }
 160                                 break;
 161                         case '-':
 162                                 show_usage();
 163                         default:
 164                                 {
 165                                         if (isdigit(**argv)) {
 166                                                 sig = atoi(*argv);
 167                                                 if (sig < 0 || sig >= NSIG)
 168                                                         goto end;
 169                                                 else {
 170                                                         argc--;
 171                                                         argv++;
 172                                                         goto do_it_now;
 173                                                 }
 174                                         } else {
 175                                                 const struct signal_name *s = signames;
 176
 177                                                 while (s->name != 0) {
 178                                                         if (strcasecmp(s->name, *argv) == 0) {
 179                                                                 sig = s->number;
 180                                                                 argc--;
 181                                                                 argv++;
 182                                                                 goto do_it_now;
 183                                                         }
 184                                                         s++;
 185                                                 }
 186                                                 if (s->name == 0)
 187                                                         goto end;
 188                                         }
 189                                 }
 190                         }
 191                         argc--;
 192                         argv++;
 193                 }
 194         }
 195
 196   do_it_now:
 197
 198         if (whichApp == KILL) {
 199                 /* Looks like they want to do a kill. Do that */
 200                 while (--argc >= 0) {
 201                         int pid;
 202
 203                         if (!isdigit(**argv))
 204                                 perror_msg_and_die( "Bad PID");
 205                         pid = strtol(*argv, NULL, 0);
 206                         if (kill(pid, sig) != 0)
 207                                 perror_msg_and_die( "Could not kill pid '%d'", pid);
 208                         argv++;
 209                 }
 210         }
 211 #ifdef BB_KILLALL
 212         else {
 213                 int all_found = TRUE;
 214                 pid_t myPid=getpid();
 215                 /* Looks like they want to do a killall.  Do that */
 216                 while (--argc >= 0) {
 217                         pid_t* pidList;
 218
 219                         pidList = find_pid_by_name( *argv);
 220                         if (!pidList || *pidList<=0) {
 221                                 all_found = FALSE;
 222                                 error_msg_and_die( "%s: no process killed", *argv);
 223                         }
 224
 225                         for(; pidList && *pidList!=0; pidList++) {
 226                                 if (*pidList==myPid)
 227                                         continue;
 228                                 if (kill(*pidList, sig) != 0)
 229                                         perror_msg_and_die( "Could not kill pid '%d'", *pidList);
 230                         }
 231                         /* Note that we don't bother to free the memory
 232                          * allocated in find_pid_by_name().  It will be freed
 233                          * upon exit, so we can save a byte or two */
 234                         argv++;
 235                 }
 236                 if (all_found == FALSE)
 237                         return EXIT_FAILURE;
 238         }
 239 #endif
 240
 241         return EXIT_SUCCESS;
 242
 243
 244   end:
 245         error_msg_and_die( "bad signal name: %s", *argv);
 246 }