On Jul 30 11:34, Corinna Vinschen via Cygwin wrote:
> Yeah, that's a bad joke as well. The reason is that the http service is
> defined for TCP only. Not for UDP. As a result, Windows' getaddrinfo
> suddenly returns a valid ai_socktype field:
>
> family: 23 socktype 1 protocol 6 AF_INET6, STREAM, TCP
> family: 2 socktype 1 protocol 6 AF_INET, STREAM, TCP
Just to be precise here, the fact that ai_protocol is IPPROTO_TCP
in this example output is only because of your hints. If you don't
restrict ai_protocol, you'll get:
family: 23 socktype 1 protocol 0 AF_INET6, STREAM, any
family: 2 socktype 1 protocol 0 AF_INET, STREAM, any
> Cygwin implements a shallow (~300 lines) wrapper over the WinSock
> GetAddrInfoW function and otherwise relies on the values returned by the
> OS. However, it already duplicates the returned list to self-allocated
> memory, which is required for fork(2) semantics. It should be possible
> to improve the wrapper to duplicate entries with socktype and protocol
> 0-entries, but that would be in the next Cygwin version earliest.
I hacked up a patch which is supposed to do exactly that. In your case
it now returns
family: 23 socktype 1 protocol 6
family: 2 socktype 1 protocol 6
and in case you omit the ai_protocol restriction it returns with
family: 23 socktype 1 protocol 6
family: 23 socktype 2 protocol 17
family: 2 socktype 1 protocol 6
family: 2 socktype 2 protocol 17
rather than with
family: 23 socktype 0 protocol 0
family: 2 socktype 0 protocol 0
I've uploaded a new developer snapshot to https://cygwin.com/snapshots
Please give it a try and report back.
Thanks,
Corinna
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