diff options
| author | hyc@symas.com <hyc@symas.com> | 2010-06-22 10:14:49 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-08-10 13:47:39 -0700 |
| commit | 26df6d13406d1a53b0bda08bd712f1924affd7cd (patch) | |
| tree | db17328acbd7cac9dc20bc854509527c1c89ca01 /arch/frv | |
| parent | a3c8ed693da9782f924223f65da9261da796e49b (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For historical reference, a good copy of the relevant files can be found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 'arch/frv')
| -rw-r--r-- | arch/frv/include/asm/ioctls.h | 2 | ||||
| -rw-r--r-- | arch/frv/include/asm/termbits.h | 1 |
2 files changed, 3 insertions, 0 deletions
diff --git a/arch/frv/include/asm/ioctls.h b/arch/frv/include/asm/ioctls.h index d0c30e31fbd..a993e3759cc 100644 --- a/arch/frv/include/asm/ioctls.h +++ b/arch/frv/include/asm/ioctls.h @@ -53,6 +53,7 @@ #define TCSETSF2 _IOW('T',0x2D, struct termios2) #define TIOCGPTN _IOR('T',0x30, unsigned int) /* Get Pty Number (of pty-mux device) */ #define TIOCSPTLCK _IOW('T',0x31, int) /* Lock/unlock Pty */ +#define TIOCSIG _IOW('T',0x36, int) /* Generate signal on Pty slave */ #define FIONCLEX 0x5450 /* these numbers need to be adjusted. */ #define FIOCLEX 0x5451 @@ -79,6 +80,7 @@ #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/arch/frv/include/asm/termbits.h b/arch/frv/include/asm/termbits.h index 5568492b508..7722e19cc34 100644 --- a/arch/frv/include/asm/termbits.h +++ b/arch/frv/include/asm/termbits.h @@ -180,6 +180,7 @@ struct ktermios { #define FLUSHO 0010000 #define PENDIN 0040000 #define IEXTEN 0100000 +#define EXTPROC 0200000 /* tcflow() and TCXONC use these */ |