src/childkiller.c

   1 //FIXME: is it safe that signal interrupted main program in arbitrary point?
   2 static void sigChildKiller (int sig, siginfo_t *siginfo, void *context) {
   3   // here we have `siginfo->si_pid`, `siginfo->si_uid`, and `siginfo->si_status` set
   4   //
   5   if (siginfo->si_code == CLD_EXITED || siginfo->si_code == CLD_KILLED || siginfo->si_code == CLD_DUMPED) {
   6     for (int f = 0; f < term_count; ++f) {
   7       if (K8T_DATA(term_array[f])->pid == siginfo->si_pid) {
   8         // this terminal should die
   9         K8Term *tt = term_array[f];
  10         //
  11         K8T_DATA(tt)->pid = 0;
  12         //
  13         if (siginfo->si_code == CLD_EXITED) {
  14           tt->dead = 1;
  15           K8T_DATA(tt)->exitcode = siginfo->si_status;
  16         } else {
  17           tt->dead = 0; // we have no child, but we are not dead yet
  18           K8T_DATA(tt)->exitcode = 127;
  19           K8T_DATA(tt)->waitkeypress = 1;
  20           //
  21           if (K8T_DATA(tt)->exitmsg != NULL) free(K8T_DATA(tt)->exitmsg);
  22           K8T_DATA(tt)->exitmsg = SPrintf("Process %d %s!", siginfo->si_pid,
  23             (siginfo->si_code == CLD_KILLED ? "was killed" :
  24              siginfo->si_code == CLD_DUMPED ? "suicides" :
  25              "dies"));
  26         }
  27         //
  28         updateTabBar = 1;
  29         break;
  30       }
  31     }
  32   }
  33 }
  34
  35
  36 static int summonChildKiller (void) {
  37   struct sigaction act;
  38   //
  39   memset(&act, 0, sizeof(act));
  40   act.sa_sigaction = &sigChildKiller;
  41   act.sa_flags = SA_NOCLDSTOP|SA_NOCLDWAIT|SA_SIGINFO;
  42   //
  43   if (sigaction(SIGCHLD, &act, NULL) < 0) return -1;
  44   //
  45   return 0;
  46 }