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| author | Josh Bleecher Snyder <josharian@gmail.com> | 2021-03-29 13:27:21 -0700 |
|---|---|---|
| committer | Josh Bleecher Snyder <josharian@gmail.com> | 2021-03-30 12:09:38 -0700 |
| commit | 517f0703f515f8cfad2f5887d71ca6fbfbbd4d72 (patch) | |
| tree | c85bb8ffd3e7058f36dcee69607dc25448343fcd | |
| parent | 204140016af494ef8e0dd2749d4ae6c4a0828a9e (diff) | |
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>
| -rw-r--r-- | conn/bind_std.go | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/conn/bind_std.go b/conn/bind_std.go index a511341..f8b8a1b 100644 --- a/conn/bind_std.go +++ b/conn/bind_std.go @@ -89,6 +89,8 @@ func (bind *StdNetBind) Open(uport uint16) (uint16, error) { return 0, ErrBindAlreadyOpen } + // Attempt to open ipv4 and ipv6 listeners on the same port. + // If uport is 0, we can retry on failure. again: port := int(uport) var ipv4, ipv6 *net.UDPConn @@ -98,6 +100,7 @@ again: return 0, err } + // Listen on the same port as we're using for ipv4. ipv6, port, err = listenNet("udp6", port) if uport == 0 && errors.Is(err, syscall.EADDRINUSE) && tries < 100 { ipv4.Close() |