Re: [PATCH] tty: Add EXTPROC support for LINEMODE

From: Howard Chu
Date: Tue Jun 15 2010 - 16:24:05 EST

Howard Chu wrote:
diff --git a/arch/alpha/include/asm/termbits.h b/arch/alpha/include/asm/termbits.h
index ad854a4..879dd35 100644
--- a/arch/alpha/include/asm/termbits.h
+++ b/arch/alpha/include/asm/termbits.h
@@ -180,6 +180,7 @@ struct ktermios {
#define FLUSHO 0x00800000
#define PENDIN 0x20000000
#define IEXTEN 0x00000400
+#define EXTPROC 0x10000000

For Alpha this value should match OSF if possible.

I'm grubbing around looking for a live Alpha system now, doesn't seem likely
that I'll find one. Not sure what needs to match here, it's also unlikely that
OSF/1 (or any other SVR4 platform) ever provided a definition for this bit.
Looking at the telnet README:
This is a distribution of both client and server telnet. These programs
have been compiled on:
telnet telnetd
BSD 4.4 x x
BSD 4.3 Reno X X
BSDI 1.0 X X
Solaris 2.2 x x (no linemode in server)
Solaris 2.3 x x (no linemode in server)
SunOs 4.1.3 X X (no linemode in server)
Ultrix 4.3 X X (no linemode in server)
DYNIX V3.0.17.9 X X (no linemode in server)
HP-UX 8.0 x x (no linemode in server)

I doubt that anyone ever ported this feature over to those OSes.

Closest thing I've found so far is for HPUX 11i Version 2:

TIOCREMOTE This ioctl puts the STREAMS pty in and out of Remote Mode. When
Remote Mode is on, input data will be flow-controlled and passed
through ldterm without any input processing regardless of the
terminal mode. When the pty master driver receives this ioctl,
it will send an M_CTL message downstream to ldterm via ptm, pts,
and ptem. The command in the M_CTL message is set to MC_NO_CANON
or MC_DO_CANON depending whether to turn on or off the Remote
Mode. The format of this ioctl is:
int ioctl(master_fd, TIOCREMOTE, argument)
where the argument is set to 1 to turn on Remote Mode and 0 to
turn it off. Remote Mode is normally used when doing remote line
editing in a window manager, or whenever flow-controlled input is
required. Each write to the master device produces a record
boundary for the process reading the slave devices. In normal
usage, a write of data is like the data typed as a line on the
terminal; a write of 0 (zero) bytes is like typing an EOF
(End-of-File) character.

TIOCSIGNAL This ioctl allows the master process to send a signal to the slave
process. The format of this ioctl is:

int ioctl(master_fd, TIOCSIGNAL, argument)
where the argument is the signal number as defined in the header
file <sys/signal.h>. For example the master process can send an
SIGINT signal to the slave process by doing:
ioctl(master_fd, TIOCSIGNAL, SIGINT)

TIOCREMOTE seems to be the SVR4 analogue to TIOCPKT without any of the useful parts; it doesn't include the prefix byte, so it doesn't provide any state change information.

-- Howard Chu
CTO, Symas Corp.
Director, Highland Sun
Chief Architect, OpenLDAP
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