remove receive signal handler

[sshane]

The only difference when receiving a termination signal is this line not being ran, but the program would be exiting anyway if this is the case:

msgq_msg_close(&msg); // Free unused message on exit

With the handler, the polling is not interrupted, so we hang until the timeout is up. If this is set high, we can get stuck here on exit.

[deanlee]

I like this solution; it resolves the issue while reducing complexity.

[sshane]

Something about this is causing pandad to hang, will need to check why

[deanlee]

It may not be directly related to the pandad issue, but we should removing the if (errno == EINTR) check in pandad after this PR.

  // run as fast as messages come in
  while (!do_exit && check_all_connected(pandas)) {
    std::unique_ptr<Message> msg(subscriber->receive());
    if (!msg) {
      if (errno ==   EINTR) {
        do_exit = true;
      }
      continue;
    }

[sshane]

thanks, that was it!