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 <unistd.h>
  32
  33 #define KILL    0
  34 #define KILLALL 1
  35
  36 struct signal_name {
  37         const char *name;
  38         int number;
  39 };
  40
  41 const struct signal_name signames[] = {
  42         /* POSIX signals */
  43         { "HUP",        SIGHUP },       /* 1 */
  44         { "INT",        SIGINT },       /* 2 */
  45         { "QUIT",       SIGQUIT },      /* 3 */
  46         { "ILL",        SIGILL },       /* 4 */
  47         { "ABRT",       SIGABRT },      /* 6 */
  48         { "FPE",        SIGFPE },       /* 8 */
  49         { "KILL",       SIGKILL },      /* 9 */
  50         { "SEGV",       SIGSEGV },      /* 11 */
  51         { "PIPE",       SIGPIPE },      /* 13 */
  52         { "ALRM",       SIGALRM },      /* 14 */
  53         { "TERM",       SIGTERM },      /* 15 */
  54         { "USR1",       SIGUSR1 },      /* 10 (arm,i386,m68k,ppc), 30 (alpha,sparc*), 16 (mips) */
  55         { "USR2",       SIGUSR2 },      /* 12 (arm,i386,m68k,ppc), 31 (alpha,sparc*), 17 (mips) */
  56         { "CHLD",       SIGCHLD },      /* 17 (arm,i386,m68k,ppc), 20 (alpha,sparc*), 18 (mips) */
  57         { "CONT",       SIGCONT },      /* 18 (arm,i386,m68k,ppc), 19 (alpha,sparc*), 25 (mips) */
  58         { "STOP",       SIGSTOP },      /* 19 (arm,i386,m68k,ppc), 17 (alpha,sparc*), 23 (mips) */
  59         { "TSTP",       SIGTSTP },      /* 20 (arm,i386,m68k,ppc), 18 (alpha,sparc*), 24 (mips) */
  60         { "TTIN",       SIGTTIN },      /* 21 (arm,i386,m68k,ppc,alpha,sparc*), 26 (mips) */
  61         { "TTOU",       SIGTTOU },      /* 22 (arm,i386,m68k,ppc,alpha,sparc*), 27 (mips) */
  62         /* Miscellaneous other signals */
  63 #ifdef SIGTRAP
  64         { "TRAP",       SIGTRAP },      /* 5 */
  65 #endif
  66 #ifdef SIGIOT
  67         { "IOT",        SIGIOT },       /* 6, same as SIGABRT */
  68 #endif
  69 #ifdef SIGEMT
  70         { "EMT",        SIGEMT },       /* 7 (mips,alpha,sparc*) */
  71 #endif
  72 #ifdef SIGBUS
  73         { "BUS",        SIGBUS },       /* 7 (arm,i386,m68k,ppc), 10 (mips,alpha,sparc*) */
  74 #endif
  75 #ifdef SIGSYS
  76         { "SYS",        SIGSYS },       /* 12 (mips,alpha,sparc*) */
  77 #endif
  78 #ifdef SIGSTKFLT
  79         { "STKFLT",     SIGSTKFLT },    /* 16 (arm,i386,m68k,ppc) */
  80 #endif
  81 #ifdef SIGURG
  82         { "URG",        SIGURG },       /* 23 (arm,i386,m68k,ppc), 16 (alpha,sparc*), 21 (mips) */
  83 #endif
  84 #ifdef SIGIO
  85         { "IO",         SIGIO },        /* 29 (arm,i386,m68k,ppc), 23 (alpha,sparc*), 22 (mips) */
  86 #endif
  87 #ifdef SIGPOLL
  88         { "POLL",       SIGPOLL },      /* same as SIGIO */
  89 #endif
  90 #ifdef SIGCLD
  91         { "CLD",        SIGCLD },       /* same as SIGCHLD (mips) */
  92 #endif
  93 #ifdef SIGXCPU
  94         { "XCPU",       SIGXCPU },      /* 24 (arm,i386,m68k,ppc,alpha,sparc*), 30 (mips) */
  95 #endif
  96 #ifdef SIGXFSZ
  97         { "XFSZ",       SIGXFSZ },      /* 25 (arm,i386,m68k,ppc,alpha,sparc*), 31 (mips) */
  98 #endif
  99 #ifdef SIGVTALRM
 100         { "VTALRM",     SIGVTALRM },    /* 26 (arm,i386,m68k,ppc,alpha,sparc*), 28 (mips) */
 101 #endif
 102 #ifdef SIGPROF
 103         { "PROF",       SIGPROF },      /* 27 (arm,i386,m68k,ppc,alpha,sparc*), 29 (mips) */
 104 #endif
 105 #ifdef SIGPWR
 106         { "PWR",        SIGPWR },       /* 30 (arm,i386,m68k,ppc), 29 (alpha,sparc*), 19 (mips) */
 107 #endif
 108 #ifdef SIGINFO
 109         { "INFO",       SIGINFO },      /* 29 (alpha) */
 110 #endif
 111 #ifdef SIGLOST
 112         { "LOST",       SIGLOST },      /* 29 (arm,i386,m68k,ppc,sparc*) */
 113 #endif
 114 #ifdef SIGWINCH
 115         { "WINCH",      SIGWINCH },     /* 28 (arm,i386,m68k,ppc,alpha,sparc*), 20 (mips) */
 116 #endif
 117 #ifdef SIGUNUSED
 118         { "UNUSED",     SIGUNUSED },    /* 31 (arm,i386,m68k,ppc) */
 119 #endif
 120         {0, 0}
 121 };
 122
 123 extern int kill_main(int argc, char **argv)
 124 {
 125         int whichApp, sig = SIGTERM;
 126         const char *appUsage;
 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         appUsage = (whichApp == KILLALL)?  killall_usage : kill_usage;
 132 #else
 133         whichApp = KILL;
 134         appUsage = kill_usage;
 135 #endif
 136
 137         argc--;
 138         argv++;
 139         /* Parse any options */
 140         if (argc < 1)
 141                 usage(appUsage);
 142
 143         while (argc > 0 && **argv == '-') {
 144                 while (*++(*argv)) {
 145                         switch (**argv) {
 146                         case 'l':
 147                                 {
 148                                         int col = 0;
 149                                         const struct signal_name *s = signames;
 150
 151                                         while (s->name != 0) {
 152                                                 col +=
 153                                                         fprintf(stderr, "%2d) %-8s", s->number,
 154                                                                         (s++)->name);
 155                                                 if (col > 60) {
 156                                                         fprintf(stderr, "\n");
 157                                                         col = 0;
 158                                                 }
 159                                         }
 160                                         fprintf(stderr, "\n\n");
 161                                         exit(TRUE);
 162                                 }
 163                                 break;
 164                         case '-':
 165                                 usage(appUsage);
 166                         default:
 167                                 {
 168                                         if (isdigit(**argv)) {
 169                                                 sig = atoi(*argv);
 170                                                 if (sig < 0 || sig >= NSIG)
 171                                                         goto end;
 172                                                 else {
 173                                                         argc--;
 174                                                         argv++;
 175                                                         goto do_it_now;
 176                                                 }
 177                                         } else {
 178                                                 const struct signal_name *s = signames;
 179
 180                                                 while (s->name != 0) {
 181                                                         if (strcasecmp(s->name, *argv) == 0) {
 182                                                                 sig = s->number;
 183                                                                 argc--;
 184                                                                 argv++;
 185                                                                 goto do_it_now;
 186                                                         }
 187                                                         s++;
 188                                                 }
 189                                                 if (s->name == 0)
 190                                                         goto end;
 191                                         }
 192                                 }
 193                         }
 194                         argc--;
 195                         argv++;
 196                 }
 197         }
 198
 199   do_it_now:
 200
 201         if (whichApp == KILL) {
 202                 /* Looks like they want to do a kill. Do that */
 203                 while (--argc >= 0) {
 204                         int pid;
 205
 206                         if (!isdigit(**argv))
 207                                 fatalError( "Bad PID: %s\n", strerror(errno));
 208                         pid = strtol(*argv, NULL, 0);
 209                         if (kill(pid, sig) != 0)
 210                                 fatalError( "Could not kill pid '%d': %s\n", pid, strerror(errno));
 211                         argv++;
 212                 }
 213         }
 214 #ifdef BB_KILLALL
 215         else {
 216                 int all_found = TRUE;
 217                 pid_t myPid=getpid();
 218                 /* Looks like they want to do a killall.  Do that */
 219                 while (--argc >= 0) {
 220                         pid_t* pidList;
 221
 222                         pidList = findPidByName( *argv);
 223                         if (!pidList) {
 224                                 all_found = FALSE;
 225                                 errorMsg( "%s: no process killed\n", *argv);
 226                         }
 227
 228                         for(; pidList && *pidList!=0; pidList++) {
 229                                 if (*pidList==myPid)
 230                                         continue;
 231                                 if (kill(*pidList, sig) != 0)
 232                                         fatalError( "Could not kill pid '%d': %s\n", *pidList, strerror(errno));
 233                         }
 234                         /* Note that we don't bother to free the memory
 235                          * allocated in findPidByName().  It will be freed
 236                          * upon exit, so we can save a byte or two */
 237                         argv++;
 238                 }
 239                 exit (all_found);
 240         }
 241 #endif
 242
 243         exit(TRUE);
 244
 245
 246   end:
 247         fatalError( "bad signal name: %s\n", *argv);
 248 }