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Full Discussion: POSIX way of getting columns in tty?
Top Forums Shell Programming and Scripting POSIX way of getting columns in tty? Post 302275570 by Perderabo on Sunday 11th of January 2009 07:24:56 AM
Old 01-11-2009
Quote:
Originally Posted by jlliagre
I'm quite sure all the tty drivers available in modern Unix variants handle the non POSIX tty wxh geometry (termios TIOCGWINSZ) and the event triggered when it changes (SIGWINCH) when using a terminal emulator on a windowing system.
I hope you will agree that Solaris 10 counts as a modern Unix variant. I wanted to use the serial system console on ttya. I connected a serial cable to second Solaris 10 system. On that 2nd system, I opened a terminal window and in that window in used tip to connect. That all works fine. But when I vary the window size on the 2nd system, the first system does not seem to be informed. And no fair telling me that I manually type "stty cols 100" (or whatever) after I change my window size.

The Solaris driver used to control ttya (and ttyb) is indeed a real terminal. The other kind of terminal is a pseudo terminal. In the case of a real terminal, where a real tty driver is truely controlling a real serial port, this isn't going to work. It's true that the old printing teletypes are almost completely gone. Ditto those "ascii terminals" too. But the serial port is still alive and well. We either use another unix system as above or a laptop running putty on XP or something like that to connect to a serial port.

This isn't to say that I dislike your solution. I think your solution is as good as it gets. I am arguing that the search for an even more generic solution is futile and that there no help to be had from Posix.

And also note that jlliagre replaced awk with a grep/sed combo. Solutions involving awk are very dangerous on Solaris. Sun absolutely refuses to retire the antique version of awk so you must either use nawk or fiddle with the path on Solaris.
 

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LEARN ABOUT OSF1

dc

dc(7)							 Miscellaneous Information Manual						     dc(7)

NAME

       dc - serial line/mouse/keyboard

SYNOPSIS

       controller   dc0   at ibus0   slot 0   vector dcintr

DESCRIPTION

       The  dc	serial	line controller provides DECstation 2100, DECstation 3100, DECstation 5000, and DECstation 5100 computer systems with key-
       board, mouse, and serial communications interfaces. The serial communications interfaces on the DECstation 2100 and DECstation 3100 provide
       partial	modem  control.  The  serial communications interfaces on the DECstation 5000 provide full modem control.  The device special file
       /dev/tty01 on a DECstation 5100 provides full modem control, while the remaining ports provide no modem control at all.	All serial  commu-
       nications interfaces operate at baud rates from B50 to B9600, excluding B200.

       The  dc	ports  are  used as follows: Usage Graphics device keyboard at 4800 BPS Mouse or tablet at 4800 BPS Communications port 1 (w/modem
       control)/local terminal Communications port 2 (w/modem control)/local terminal

       On all systems except the DECstation 5100, serial port 2 is used for the system console port in server (that is,  non-graphics)	configura-
       tions.  On DECstation 5100s, the serial port labeled 3 on the back of the system is always the system console port.  The serial system con-
       sole port always operates at 9600 BPS, 8-bits, no parity; modem control is not supported.

RESTRICTIONS

       Data communications equipment attached to the console serial port in server configurations must be set to 9600 BPS, 8-bits, no parity.  The
       scc driver enforces this restriction.

FILES

       console terminal local terminal local terminal local terminal (DECstation 5100 only)

RELATED INFORMATION

       console(7), devio(7), tty(7), MAKEDEV(8) delim off

																	     dc(7)
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