Re: winsock: needs access to SOCKET in application code

[Paolo Bonzini]

> If there is a way to reliably check whether something is a HANDLE or not
> (or a low-level fd or not), the code could be re-written to cleanly
> treat them as separate objects, and thus be more reliable.

Both HANDLEs and fds are indexes into a table, in the end.  So you can
check if X is a HANDLE or if X is a fd, but there's no guarantee that
the same X cannot be a HANDLE *and* a fd; and if so, it would likely
mean two different things depending on how you interpret it.

Paolo