HelenOS sources

async_hangup_internal 1075 uspace/lib/c/generic/async/client.c 	async_hangup_internal(sess->phone);
async_hangup_internal 1086 uspace/lib/c/generic/async/client.c 			async_hangup_internal(exch->phone);
async_hangup_internal 1157 uspace/lib/c/generic/async/client.c 					async_hangup_internal(phone);
async_hangup_internal 1170 uspace/lib/c/generic/async/client.c 				async_hangup_internal(exch->phone);
HelenOS homepage, sources at GitHub