How to properly use GIOChannel buffers?

[Paul Fertser <fercerpav gmail com>]

Hi,

I've got a specific question about Glib GIOChannel buffers. How to
ensure that the buffers will always be flushed as soon as possible?
I've tried to set IO watch but it's called with G_IO_OUT if there's
free space in the buffer, not if the buffer can be flushed.

What am i missing here? Shouldn't the buffers be flushed automatically
as soon as there's a possibility to write to the fd?

FYI i'm trying to use glib buffering feature to buffer data going to a
pty which is needed in case the receiving application is busy and
in-kernel pty buffer can overflow.

TIA
Happy hacking!
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