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For historical reference, a good copy of the relevant files can be found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>

2 files changed, 3 insertions, 0 deletions

diff --git a/include/asm-generic/ioctls.h b/include/asm-generic/ioctls.h
index 1375fa1a7a4d..8554cb6a81b9 100644
--- a/include/asm-generic/ioctls.h
+++ b/include/asm-generic/ioctls.h
@@ -69,6 +69,7 @@
 #define TCSETX          0x5433
 #define TCSETXF         0x5434
 #define TCSETXW         0x5435
+#define TIOCSIG         _IOW('T', 0x36, int)  /* pty: generate signal */
 
 #define FIONCLEX        0x5450
 #define FIOCLEX         0x5451
@@ -102,6 +103,7 @@
 #define TIOCPKT_START            8
 #define TIOCPKT_NOSTOP          16
 #define TIOCPKT_DOSTOP          32
+#define TIOCPKT_IOCTL           64
 
 #define TIOCSER_TEMT    0x01    /* Transmitter physically empty */
 
diff --git a/include/asm-generic/termbits.h b/include/asm-generic/termbits.h
index 1c9773d48cb0..232b4781aef3 100644
--- a/include/asm-generic/termbits.h
+++ b/include/asm-generic/termbits.h
@@ -178,6 +178,7 @@ struct ktermios {
 #define FLUSHO  0010000
 #define PENDIN  0040000
 #define IEXTEN  0100000
+#define EXTPROC 0200000
 
 /* tcflow() and TCXONC use these */
 #define TCOOFF          0