copas.connect() repeats skt:connect()....why?

[Oliver Kroth <oliver.kroth@...>]

Hello,

I am currently trying to get a Lua script working that uses COPAS with 
client sockets, i.e. it does a copas.connect() call.
The underlying OS tells me that the socket is opened twice: once with 
the result "timeout" which is perfect, but later again, and then it fails.

The code in copas looks like this:

function copas.connect(skt, host, port)
  skt:settimeout(0)
  local ret, err
  repeat
    ret, err = skt:connect (host, port)
    if ret or err ~= "timeout" then
      _writing_log[skt] = nil
      return ret, err
    end
    _writing_log[skt] = gettime()
    coroutine.yield(skt, _writing)
  until false
  return ret, err
end

One can see that there is a repeat-until loop around the skt:connect()
As far as I know, the "standard" method to connect a non.blocking socket 
is to call connect() and then do a select() to find out when it is 
writeable.

Possibly the above method works under Linux, etc. but it does not work 
with the OS I have to use. The second skt:connect() fails with an error 
telling me that the socket has an illegal handle (possibly because it is 
not a not yet connect()-ed socket).

Does anyone have a hint?

--
Oliver