asynchronous channel write

[Torsten Kuehnel <tdkuehnel@xxxxxxxxxxxxxxxxxxxxx>]

Working on the reference implementation of the ncot library i am
confronted with the follwoing use case:

Data packets are to be received and send from/to several simultaneous
open ssh-like encrypted channels to instances of the same program
running on other hosts over the network.

The one client-server connection -> one thread paradigm does not fit
so well. Packets have to be validated, act upon and processed in
different ways, and need to be resend to other connections - this is
the real part of the implementation.

So my approach currently is the following one:

A mainloop with ssh_event_dopoll manages to call my channel callbacks
i have established during initialization of the several sessions. But
when it comes to write my packets over the channels, libssh only offers
a blocking ssh_channel_write call what is not what i want.

When the poll returns with write possible, i usually try to write as
much as i can and send tells me how much succeded. How can i achieve
this behaviour using libssh ?

thanks for any insights in advance, keep up the good work !

-- Torsten Kuehnel
<tdkuehnel@xxxxxxxxxxxxxxxxxxxxx>