conn: document retry loop in StdNetBind.Open
It's not obvious on a first read what the loop is doing. Signed-off-by: Josh Bleecher Snyder <josharian@gmail.com>
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@ -89,6 +89,8 @@ func (bind *StdNetBind) Open(uport uint16) (uint16, error) {
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return 0, ErrBindAlreadyOpen
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}
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// Attempt to open ipv4 and ipv6 listeners on the same port.
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// If uport is 0, we can retry on failure.
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again:
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port := int(uport)
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var ipv4, ipv6 *net.UDPConn
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@ -98,6 +100,7 @@ again:
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return 0, err
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}
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// Listen on the same port as we're using for ipv4.
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ipv6, port, err = listenNet("udp6", port)
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if uport == 0 && errors.Is(err, syscall.EADDRINUSE) && tries < 100 {
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ipv4.Close()
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