ttys.. i must be doing something wrong.. Post: 6889

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Top Forums UNIX for Dummies Questions & Answers ttys.. i must be doing something wrong.. Post 6889 by Perderabo on Friday 14th of September 2001 09:58:27 AM

09-14-2001

Administrator Emeritus

I have never worked on a SCO box. And I have never neard of "ditty". But I will describe a similiar sounding problem and solutions involving more mainstream versions of unix and the "stty" program.

Tty ports on systems like hp-ux have a default set of characteristics. You can vary them by opening the device file and issueing an ioctl() call. The
program stty does this. But here is the key...when the last process closes the file, the characteristics go back to the defaults.

So a command like:
stty 9600 < /dev/tty01
changes the baud rate for only as long as the stty command is running.

An ugly but common solution is to run a script like:
( stty 9600 ; sleep 1000000 ) < /dev/tty01
at startup.

A more correct solution is to insure that any program or script that needs to use the port shoulders the responsibility as setting it up the way it need to be. Thus the stty statement should be placed in the interface script used by the lp subsystem to actually do the printing.

Maybe your ditty problem is something like that. But the mere existence of a system command called ditty shows a disregard for unix standards...so maybe not.

Perderabo

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LEARN ABOUT MINIX

ttytab

TTYTAB()																  TTYTAB()

NAME

       ttytab - table of login terminals

SYNOPSIS

       /etc/ttytab

DESCRIPTION

       The ttytab file lists all the terminal devices that one can login on.  It is a simple text file that contains lines of the form:

	      name type "getty"   "init"

       The  name and type fields are simple words, name is the name of the terminal device with /dev stripped off, and type tells the type of ter-
       minal to initialize the TERM environment variable.

       The getty and init fields may name commands that are run to allow one to login on the line, or to initialize the line.  Both  these  fields
       may be more than one word if the whole field is enclosed in double quotes.  Getty is usually simply the word getty, the command that prints
       a system identification banner and allows on to type a name to log in.  Init is usually an stty command to set the baud rate and parity	of
       a serial line.

       The  init  field  may  be omitted to indicate that no initialization is necessary, and the getty field may be left out to not start a login
       process.  Terminals should not be left out, because their place in the ttytab file determines their slot number as returned by ttyslot(3).

       Comments (introduced by #) and empty lines are ignored.

EXAMPLE

       A ttytab for the console, two serial lines, and a pseudo tty entry:

	      console	  minix       getty
	      tty00	  vt100       getty	  "stty 9600"
	      tty01	  dialup      getty	  "stty 38400"
	      ttyp0	  network

ENVIRONMENT

       TERM	      Terminal type

NOTES

       It is customary to set the type to dialup for a dialin line.  One can check for that name in one's .profile.

SEE ALSO

       gettyent(3), ttyslot(3), init(8).

AUTHOR

       Kees J. Bot (kjb@cs.vu.nl)

																	  TTYTAB()