UDP doesn't have connections, so there's nothing analogous to TIME_WAIT. You don't need to use SO_REUSEADDR.
If you're listening on a broadcast or multicast address, you might need to use SO_REUSEPORT, so that if there are multiple listeners on the same machine they don't conflict. However, from what I can tell, this doesn't exist on Linux.
事实上还是有用的，不信试试
UDP doesn't have connections, so there's nothing analogou...
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