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ip: implement "hangup" ctl for udp protocol

--- a/sys/src/9/ip/udp.c

+++ b/sys/src/9/ip/udp.c

@@ -518,6 +518,11 @@

 	ucb = (Udpcb*)c->ptcl;

 	if(n == 1){

+		if(strcmp(f[0], "hangup") == 0){

+			qhangup(c->rq, nil);

+			qhangup(c->wq, nil);

+			return nil;

+		}

 		if(strcmp(f[0], "headers") == 0){

 			ucb->headers = 7;	/* new headers format */

 			return nil;