Messages in this thread | | | Date | Tue, 22 Jun 2010 08:59:38 -0700 | From | Howard Chu <> | Subject | Re: [PATCH] tty: Add EXTPROC support for LINEMODE |
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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 historical reference, a good copy of the relevant files can be found here: 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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