Commit Graph

3 Commits

Author SHA1 Message Date
hyc@symas.com 26df6d1340 tty: Add EXTPROC support for LINEMODE
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For historical reference, a good copy of the relevant files can be found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>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2010-08-10 13:47:39 -07:00
Robert Reif e64ed0225b sparc: Fix tty compile warnings.
This patch fixes tty compile warnings as sugested by Alan Cox:

CC drivers/char/n_tty.o
drivers/char/n_tty.c: In function ‘normal_poll’:
drivers/char/n_tty.c:1555: warning: array subscript is above array bounds
drivers/char/n_tty.c:1564: warning: array subscript is above array bounds
drivers/char/n_tty.c: In function ‘read_chan’:
drivers/char/n_tty.c:1269: warning: array subscript is above array bounds
CC drivers/char/tty_ioctl.o
drivers/char/tty_ioctl.c: In function ‘set_termios’:
drivers/char/tty_ioctl.c:533: warning: array subscript is above array 
bounds
drivers/char/tty_ioctl.c:537: warning: array subscript is above array 
bounds
drivers/char/tty_ioctl.c: In function ‘tty_mode_ioctl’:
drivers/char/tty_ioctl.c:662: warning: array subscript is above array 
bounds
drivers/char/tty_ioctl.c:892: warning: array subscript is above array 
bounds
drivers/char/tty_ioctl.c:896: warning: array subscript is above array 
bounds
drivers/char/tty_ioctl.c:577: warning: array subscript is above array 
bounds
drivers/char/tty_ioctl.c:928: warning: array subscript is above array 
bounds
drivers/char/tty_ioctl.c:934: warning: array subscript is above array 
bounds

Signed-off-by: Robert Reif <reif@earthlink.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
2008-11-12 23:51:54 -08:00
Sam Ravnborg a439fe51a1 sparc, sparc64: use arch/sparc/include
The majority of this patch was created by the following script:

***
ASM=arch/sparc/include/asm
mkdir -p $ASM
git mv include/asm-sparc64/ftrace.h $ASM
git rm include/asm-sparc64/*
git mv include/asm-sparc/* $ASM
sed -ie 's/asm-sparc64/asm/g' $ASM/*
sed -ie 's/asm-sparc/asm/g' $ASM/*
***

The rest was an update of the top-level Makefile to use sparc
for header files when sparc64 is being build.
And a small fixlet to pick up the correct unistd.h from
sparc64 code.

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
2008-07-27 23:00:59 +02:00