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authorhyc@symas.com <hyc@symas.com>2010-06-22 10:14:49 -0700
committerGreg Kroah-Hartman <gregkh@suse.de>2010-08-10 13:47:39 -0700
commit26df6d13406d1a53b0bda08bd712f1924affd7cd (patch)
treedb17328acbd7cac9dc20bc854509527c1c89ca01 /include/asm-generic/ioctls.h
parenta3c8ed693da9782f924223f65da9261da796e49b (diff)
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 For historical reference, a good copy of the relevant files can be found here: http://anonsvn.mit.edu/viewvc/krb5/trunk/src/appl/telnet/?pathrev=17741 Signed-off-by: Howard Chu 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>
Diffstat (limited to 'include/asm-generic/ioctls.h')
-rw-r--r--include/asm-generic/ioctls.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/asm-generic/ioctls.h b/include/asm-generic/ioctls.h
index 1375fa1a7a4..8554cb6a81b 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 */