Can a C function(server program) be a UDP or TCP server?

Hi there,<br /><br />Is it possible to write a dynamic loaded C function as an UDP or TCP server?<br /><br />What we
wantto do it is:<br />Add a search function which send a UDP package to remote UDP server<br />and then listen to an
UDPport, waiting for the result. <br />Ideally, we don't close the UDP server after the search query end.<br />So we
canreuse it for next search.<br /><br />Is it possible?<br /><br />Thanks<br /><br />Billow<br />