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SubjectRe: [PATCH] tty: Add EXTPROC support for LINEMODE
Ping... any other issues with this patch?

hyc@symas.com wrote:
> This patch is against the 2.6.34 source.
>
> Paraphrased from the 1989 BSD patch by David Borman @ cray.com:
>
> These are the changes needed for the kernel to support
> LINEMODE in the server.
>
> There is a new bit in the termios local flag word, EXTPROC.
> When this bit is set, several aspects of the terminal driver
> are disabled. Input line editing, character echo, and mapping
> of signals are all disabled. This allows the telnetd to turn
> off these functions when in linemode, but still keep track of
> what state the user wants the terminal to be in.
>
> New ioctl:
> TIOCSIG Generate a signal to processes in the
> current process group of the pty.
>
> There is a new mode for packet driver, the TIOCPKT_IOCTL bit.
> When packet mode is turned on in the pty, and the EXTPROC bit
> is set, then whenever the state of the pty is changed, the
> next read on the master side of the pty will have the TIOCPKT_IOCTL
> bit set. This allows the process on the server side of the pty
> to know when the state of the terminal has changed; it can then
> issue the appropriate ioctl to retrieve the new state.
>
> Since the original BSD patches accompanied the source code for telnet I've
> left that reference here, but obviously the feature is useful for any remote
> terminal protocol, including ssh.
>
> The corresponding feature has existed in the BSD tty driver since 1989. For
> historical reference, a good copy of the relevant files can be found here:
>
> http://anonsvn.mit.edu/viewvc/krb5/trunk/src/appl/telnet/?pathrev=17741
>
> Signed-off-by: Howard Chu<hyc@symas.com>


--
-- Howard Chu
CTO, Symas Corp. http://www.symas.com
Director, Highland Sun http://highlandsun.com/hyc/
Chief Architect, OpenLDAP http://www.openldap.org/project/


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