procps/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  * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
   7  *
   8  * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
   9  */
  10
  11 #include "busybox.h"
  12
  13 int kill_main(int argc, char **argv)
  14 {
  15         char *arg;
  16         pid_t pid;
  17         int signo = SIGTERM, errors = 0, quiet = 0;
  18         const int killall = (ENABLE_KILLALL && applet_name[4] == 'a'
  19                        && (!ENABLE_KILLALL5 || applet_name[7] != '5'));
  20         const int killall5 = (ENABLE_KILLALL5 && applet_name[4] == 'a'
  21                           && (!ENABLE_KILLALL || applet_name[7] == '5'));
  22
  23         /* Parse any options */
  24         argc--;
  25         arg = *++argv;
  26
  27         if (argc < 1 || arg[0] != '-') {
  28                 goto do_it_now;
  29         }
  30
  31         /* The -l option, which prints out signal names. */
  32         if (arg[1] == 'l' && arg[2] == '\0') {
  33                 const char *name;
  34                 if (argc == 1) {
  35                         /* Print the whole signal list */
  36                         int col = 0;
  37                         for (signo = 1; signo < 32; signo++) {
  38                                 name = get_signame(signo);
  39                                 if (isdigit(name[0])) continue;
  40                                 if (col > 66) {
  41                                         puts("");
  42                                         col = 0;
  43                                 }
  44                                 col += printf("%2d) %-6s", signo, name);
  45                         }
  46                         puts("");
  47                 } else { /* -l <sig list> */
  48                         while ((arg = *++argv)) {
  49                                 if (isdigit(arg[0])) {
  50                                         signo = xatoi_u(arg);
  51                                         name = get_signame(signo);
  52                                 } else {
  53                                         signo = get_signum(arg);
  54                                         if (signo < 0)
  55                                                 bb_error_msg_and_die("unknown signal '%s'", arg);
  56                                         name = get_signame(signo);
  57                                 }
  58                                 printf("%2d) %s\n", signo, name);
  59                         }
  60                 }
  61                 /* If they specified -l, we are all done */
  62                 return EXIT_SUCCESS;
  63         }
  64
  65         /* The -q quiet option */
  66         if (killall && arg[1] == 'q' && arg[2] == '\0') {
  67                 quiet = 1;
  68                 arg = *++argv;
  69                 argc--;
  70                 if (argc < 1) bb_show_usage();
  71                 if (arg[0] != '-') goto do_it_now;
  72         }
  73
  74         /* -SIG */
  75         signo = get_signum(&arg[1]);
  76         if (signo < 0)
  77                 bb_error_msg_and_die("bad signal name '%s'", &arg[1]);
  78         arg = *++argv;
  79         argc--;
  80
  81 do_it_now:
  82
  83         if (killall5) {
  84                 pid_t sid;
  85                 procps_status_t* p;
  86
  87 // Cannot happen anyway? We don't TERM ourself, we STOP
  88 //              /* kill(-1, sig) on Linux (at least 2.1.x)
  89 //               * might send signal to the calling process too */
  90 //              signal(SIGTERM, SIG_IGN);
  91                 /* Now stop all processes */
  92                 kill(-1, SIGSTOP);
  93                 /* Find out our own session id */
  94                 pid = getpid();
  95                 sid = getsid(pid);
  96                 /* Now kill all processes except our session */
  97                 while ((p = procps_scan(0))!=0) {
  98                         if (getsid(p->pid)!=sid && p->pid!=pid && p->pid!=1)
  99                                 kill(p->pid, signo);
 100                 }
 101                 /* And let them continue */
 102                 kill(-1, SIGCONT);
 103                 return 0;
 104         }
 105
 106         /* Pid or name required for kill/killall */
 107         if (argc < 1)
 108                 bb_show_usage();
 109
 110         if (killall) {
 111                 /* Looks like they want to do a killall.  Do that */
 112                 pid = getpid();
 113                 while (arg) {
 114                         pid_t* pidList;
 115
 116                         pidList = find_pid_by_name(arg);
 117                         if (*pidList == 0) {
 118                                 errors++;
 119                                 if (!quiet)
 120                                         bb_error_msg("%s: no process killed", arg);
 121                         } else {
 122                                 pid_t *pl;
 123
 124                                 for (pl = pidList; *pl; pl++) {
 125                                         if (*pl == pid)
 126                                                 continue;
 127                                         if (kill(*pl, signo) == 0)
 128                                                 continue;
 129                                         errors++;
 130                                         if (!quiet)
 131                                                 bb_perror_msg("cannot kill pid %u", (unsigned)*pl);
 132                                 }
 133                         }
 134                         free(pidList);
 135                         arg = *++argv;
 136                 }
 137                 return errors;
 138         }
 139
 140         /* Looks like they want to do a kill. Do that */
 141         while (arg) {
 142                 /* Huh?
 143                 if (!isdigit(arg[0]) && arg[0] != '-')
 144                         bb_error_msg_and_die("bad pid '%s'", arg);
 145                 */
 146                 pid = xatou(arg);
 147                 /* FIXME: better overflow check? */
 148                 if (kill(pid, signo) != 0) {
 149                         bb_perror_msg("cannot kill pid %u", (unsigned)pid);
 150                         errors++;
 151                 }
 152                 arg = *++argv;
 153         }
 154         return errors;
 155 }