src/childkiller.c

   1 #include <sys/signalfd.h>
   2
   3
   4 static void processDeadChildren (int sigfd) {
   5   struct signalfd_siginfo si;
   6   while (read(sigfd, &si, sizeof(si)) > 0) {} // ignore errors here
   7   for (;;) {
   8     int status;
   9     pid_t pid = waitpid(-1, &status, WNOHANG);
  10     if (pid <= 0) break; // no more dead children
  11     // find terminal with this pid
  12     for (int f = 0; f < term_count; ++f) {
  13       if (K8T_DATA(term_array[f])->pid == pid) {
  14         // this terminal should die
  15         K8Term *tt = term_array[f];
  16         K8T_DATA(tt)->pid = 0;
  17         if (WIFEXITED(status)) {
  18           fprintf(stderr, "found dead children: %d\n", pid);
  19           tt->dead = 1;
  20           K8T_DATA(tt)->exitcode = WEXITSTATUS(status);
  21         } else {
  22           fprintf(stderr, "found murdered children: %d\n", pid);
  23           tt->dead = 0; // we have no child, but we are not dead yet
  24           K8T_DATA(tt)->exitcode = 127;
  25           K8T_DATA(tt)->waitkeypress = 1;
  26           if (K8T_DATA(tt)->exitmsg != NULL) free(K8T_DATA(tt)->exitmsg);
  27           if (WIFSIGNALED(status)) {
  28             K8T_DATA(tt)->exitmsg = SPrintf("Process %u died due to signal %u!", (unsigned)pid, (unsigned)(WTERMSIG(status)));
  29           } else {
  30             K8T_DATA(tt)->exitmsg = SPrintf("Process %u died due to unknown reason!", (unsigned)pid);
  31           }
  32         }
  33         updateTabBar = 1;
  34         break;
  35       }
  36     }
  37   }
  38 }
  39
  40
  41 static int summonChildSaviour (void) {
  42   sigset_t mask;
  43   sigemptyset(&mask);
  44   sigaddset(&mask, SIGCHLD);
  45   sigprocmask(SIG_BLOCK, &mask, NULL); // we block the signal
  46   //pthread_sigmask(SIG_BLOCK, &mask, NULL); // we block the signal
  47   return signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC);
  48 }