Function sigkill_target

tests/system_test/signal_test.cpp:86–94

// ---------------------------------------------------------------------------

void sigkill_target(void* /*arg*/) {
  // Attempt to ignore SIGKILL -- this should fail
  (void)sys_sigaction(signal_number::kSigKill, kSigIgn);

  // Sleep long enough for the parent to send SIGKILL
  (void)sys_sleep(5000);
  // Should never reach here
  sys_exit(0);
}

void test_sigkill(void* /*arg*/) {
  klog::Info("=== Signal: SIGKILL Test ===");