Re: Nonblocking Behaviour for .NET

[Jason Curl <jason@xxxxxxxxxxxxxxxxxxxxxxxx>]

On 26/05/2017 12:31, Jason Curl wrote:
> Hello,
>
> I've been reading the APIs and I don't find a solution, nor an example 
> on how to do nonblocking connect, read and write. I'm writing a 
> wrapper for libssh in .NET using C#, so I can't use any API that talks 
> about an fd_set (requires C macros), struct timeval (which changes per 
> OS). It should work on Windows and Linux.
>
> Till now, the only docs I can see is that connect needs to be called 
> more than once. I don't find a way to know when connect is finished 
> (must I really poll? and if so, is there an example somewhere?) I was 
> originally going to write a C-wrapper DLL that handles select() and 
> fd's, but then that won't work on Windows.
>
> Or would it, if I use the WinSock2 functionality under windows, and 
> standard Posix under Linux?

It doesn't appear to work (at least yet)

ssh_set_blocking(session, false);
ssh_connect(session);
fd = ssh_get_fd(session);

// Here is where  i have a wrapper library to do select(), with the fd 
returned above in the fd_set for writefds.
FD_SET writefds;
FD_ZERO(&writefds);
FD_SET(fd, &writefds);
sres = select(fd+1, NULL, &writefds, NULL, &timeout); // returns 1
if (FD_ISSET(fd, &writefds)) rc = ssh_connect(session) // returns -2, 
indicating EAGAIN.

I don't understand the code too well, but there's only one instance of 
SSH_AGAIN and that is:
if(!ssh_is_blocking(session) &&!ssh_connect_termination(session)){
returnSSH_AGAIN;
}

Is there a way to know the connect is finished, or do I have to 
continuously poll with connect?
> Thanks in advance,
>
> Jason.