<html><head><meta http-equiv="Content-Type" content="text/html; charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">Howdy all,<div class=""><br class=""></div><div class="">I've been making some proposal work for updates to netsend/netreceive.</div><div class=""><br class=""></div><div class="">One issue is making UDP sending ignore connection refused errors. I have this working by catching the return value from recv():</div><div class=""><br class=""></div><div class=""> /* keep UDP alive */<br class=""> if (sys_sockerrno() == ECONNREFUSED && x->x_protocol == SOCK_DGRAM)<br class=""> return;</div><div class=""><br class=""></div><div class="">(I added sys_sockerrno() to return the socket errno.)</div><div class=""><br class=""></div><div class="">From my reading on the socket API, sending a UDP message conceptually shouldn't care about whether the receiver is there. However this is detected on a lower networking layer and propagated up to the application layer where it can be used or ignored.</div><div class=""><br class=""></div><div class="">My questions are:</div><div class=""><br class=""></div><div class="">1. Should this ignore silently and not close the connection? I notice mrpeach [udpsend] seems to ignores the first try, then closes the socket on the next failure. However, I like keeping the socket as no errors are thrown and you can easily break than re-establish UDP sending/receiving. This works well with the [netsend] dst & source relays.</div><div class=""><br class=""></div><div class="">2. Should this be a creation argument, say -k? I imagine there are plenty of patches which expect the socket to be closed automatically and respond to a 0 from the connection outlet. On the other hand, as UDP is "connectionless" my thinking is that the conceptual "connection" of a UDP [netsend] (aka outlet) refers to the internal socket and not necessarily that the destination is reachable. With TCP, the connection state more obviously refers to 1-1 connection with the other side.</div><div class=""><br class=""><div class="">
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