Re: [OT] Two sockets questions

[Stephen Leake <Stephe.Leake@nasa.gov>]

Samuel Tardieu <sam@rfc1149.net> writes:

> >>>>> "Jano" == Jano  <nono@celes.unizar.es> writes:
> 
> Jano> Is there a way of performing a connect without blocking on it? I
> Jano> suspect not... and if not in Ada, by other means?
> 
> Sure! I'll describe the process in C, I do not know whether
> GNAT.Sockets allows you to do all those steps:
> 
>   1) Create your socket
>   2) Make it non-blocking
>   3) connect() will return immediately with either 0 (success), -1
>      with errno set to EINPROGRESS or -1 with another error (real
>      error).
>   4) If the result was -1/EINPROGRESS, do a select() on the socket for
>      writing. When it tells you that you can write, write() 0 bytes. If
>      there is no error (write() returns 0), then you are
>      connected. Otherwise, you will get an error (typically
>      -1/ENOTCONN).

This is not C. It is English. Hm, I suppose "EINPROGRESS" could be a C
macro, but it could equally well be an Ada named number.

I suspect Jano is wondering how to accomplish step 2; exactly what
function (C or Ada) should be called, with what parameters?

-- 
-- Stephe