Method onSdInternalEvent

src/Connection.cpp:411–432

}

int Connection::onSdInternalEvent(sd_event_source */*s*/, int /*fd*/, uint32_t /*revents*/, void *userdata)
{
    auto *connection = static_cast<Connection*>(userdata);
    assert(connection != nullptr);

    // It's not really necessary to processPendingEvent() here. We just clear the event fd.
    // The sd-event loop will before the next poll call prepare callbacks for all event sources,
    // including I/O bus fd. This will get up-to-date poll timeout, which will be zero if there
    // are pending D-Bus messages in the read queue, which will immediately wake up next poll
    // and go to onSdIoEvent() handler, which calls processPendingEvent(). Viola.
    // For external event loops that only have access to public sdbus-c++ API, processPendingEvent()
    // is the only option to clear event fd (it comes at a little extra cost but on the other hand
    // the solution is simpler for clients -- we don't provide an extra method for just clearing
    // the event fd. There is one method for both fd's -- and that's processPendingEvent().

    // Kept here so that potential readers know what to do in their custom external event loops.
    //(void)connection->processPendingEvent();

    connection->eventFd_.clear();

    return 1;
}

int Connection::onSdEventPrepare(sd_event_source */*s*/, void *userdata)
{