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import std/[nativesockets, asyncdispatch, os]
proc bindAvailablePort*(handle: SocketHandle, port = Port(0)): Port =
## See also `asynchttpserver.getPort`.
block:
var name: Sockaddr_in = default(Sockaddr_in)
name.sin_family = typeof(name.sin_family)(toInt(AF_INET))
name.sin_port = htons(uint16(port))
name.sin_addr.s_addr = htonl(INADDR_ANY)
if bindAddr(handle, cast[ptr SockAddr](addr(name)),
sizeof(name).Socklen) < 0'i32:
raiseOSError(osLastError(), $port)
result = getLocalAddr(handle, AF_INET)[1]
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