the unix select function returns a set of file descriptors to be handled. the result-loop (the loop after the select()) is called again, if more than one descriptor is removed by the callback funtion. this may lead to a another call to the callback function, because the bits of the FD_SETs do not change and still set.

i think we must clear these bits, if they are handled, so the handler will not be called twice in case of a "restart" of that loop.