make port channel use setsockopt SO_REUSEADDR

Hi All,

Small patch to make port channels allow reuse of local addresses. Useful in the case where you restart a UML from a script and you don't want to have to allocate a new port number each time.

~mc

@@ -118,12 +118,16 @@
 int port_listen_fd(int port)
 {
 	struct sockaddr_in addr;
-	int fd, err;
+	int fd, err, arg;
 
 	fd = socket(PF_INET, SOCK_STREAM, 0);
 	if(fd == -1) 
 		return(-errno);
 
+	arg = 1;
+	if(setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &arg, sizeof(arg)) < 0)
+		return(-errno);
+
 	addr.sin_family = AF_INET;
 	addr.sin_port = htons(port);
 	addr.sin_addr.s_addr = htonl(INADDR_ANY);

Applied, except I fixed the error case slightly.

Jeff

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Ooops, yes, my bad. leaking fd.

Thanks,
~mc

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[email protected]
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