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xen-devel
Re: [Xen-devel] [RFC PATCH] allow connecting to xenconsole from remote h
On Wed, Sep 06, 2006 at 04:52:38PM +0100, Keir Fraser wrote:
> Possibly, yes, but this patch seems to do a fair bit more than just add
> minimal socket support. What's all the message queue stuff about? Can't you
> treat the console I/O as character streams?
A message is just a bunch of characters we've read at once. Messages
are read from one stream and written to another. After being read and
before being written, they're held on queues. The messages and queues
serve two purposes:
- they give us a place to hold characters we read from one stream
(console pty or socket) until the other becomes writable. With
stdout/stdin everything is always readable and writable - with a
socket this isn't necessarily true.
- 'noecho' mode, where we discard stuff that we read back from a given
fd after we've just written it there ourselves. Without this you get
every console command echo'd back to you from the pty
immediately. For what it's worth this happens without the socket
support as well, except there we put stdout into raw mode so that
the terminal does the 'echo cancelation'. I didn't find a way to
have the pty not echo everything back at me and I didn't want to
rely on the remote tty being in 'raw' mode, so I implemented it
myself.
Cheers,
Muli
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