Hi Mark,
On 30/09/2019 12:56, mark sheppard wrote:
the first uses the InetSocketAddress allocated and then the second uses the
same address, without bind exception because of
the SO_REUSEADDR option being set, even if the close had not completed at that
time.
No. The second doesn't use the address. I agree that it might - if
e.g. the system has run out of ephemeral ports, but I believe it's
highly unlikely.
$ jshell
jshell> InetSocketAddress clientAddress =
...> new
InetSocketAddress(InetAddress.getLoopbackAddress(), 0);
clientAddress ==> localhost/127.0.0.1:0
jshell> try (MulticastSocket s = new
MulticastSocket(clientAddress)) {
...> // no-op; close immediately
...> System.out.println(s.getLocalPort());
...> }
59951
jshell> MulticastSocket s = new MulticastSocket(clientAddress);
s ==> java.net.MulticastSocket@1a86f2f1
jshell> System.out.println(s.getLocalPort());
55379
best regards,
-- daniel
