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Full Discussion: Porting Linux and TTY / Shell problems
Top Forums UNIX for Advanced & Expert Users Porting Linux and TTY / Shell problems Post 302328709 by Interloper on Thursday 25th of June 2009 05:01:02 AM
Old 06-25-2009
So, as it turns out, the TTY and serial layers were fine.
The actual problem I'm having is with the schedule_delayed_work call.

The function tty_flip_buffer_push in drivers/char/tty_buffer.c calls flush_to_ldisc, which pushes the data to user space, if the tty->low_latency flag is set. Otherwise, it will push onto the scheduler with schedule_delayed_work. The problem here is that this delayed work is never revisited. Thus, my character input was never sent through to user space because the scheduler never called the process to do it again.

For the time being, I have hard coded it to always call flush_to_ldisc instead of the schedule_delayed_work, but this is not a fix, this is a workaround. Does anyone have any suggestions as to why this scheduling call wouldn't behave correctly?
 

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LEARN ABOUT DEBIAN

remote-tty

REMOTE-TTY(1)						      General Commands Manual						     REMOTE-TTY(1)

NAME

       remote-tty - connect to a ttysrv serial console instance

SYNOPSIS

       remote-tty [-l LoginName] [-7] [-r] socket

DESCRIPTION

       remote-tty  is  the  frontend  for the remote-tty daemon. It is normally invoked using rconsole.  It connects to the backend ttysrv process
       over a Unix socket and allows the user to view what's happening on the serial console and interact with it.

OPTIONS

       socket The full path to the Unix socket for the ttysrv instance to connect to.

       -l loginname
	      Specify the login name to use. Defaults to the username if not specified.

       -r     Set restricted mode; don't allow changing of logging status, suspending of remote-tty or setting of line options.

       -7     Set 7bit mode.

SEE ALSO

       rconsole(1), remote-tty(1), ttysrv(8).

AUTHOR

       rtty was written by Paul Vixie <vixie@isc.org>. This manual page was written by Jonathan McDowell <noodles@earth.li> for the Debian project
       (but may be used by others).

								   May 23, 2006 						     REMOTE-TTY(1)
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