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Linux Tutorial - System Monitoring - Finding Out About Your System - Terminals
  Hardware and the Kernel ---- Hard Disks and File Systems  


Terminals

Each line in /etc/inittab that refers to a terminal device points to an entry in the /etc/gettydefs file. The entry for the COM1 port (/dev/ttyS1) might look like this:

S1:234:respawn:/etc/getty ttyS1 M19200

From our discussion of the /etc/inittab file in the section on starting and stopping the system, you see that this entry starts the /etc/getty command. Two arguments are passed to getty: the terminal on which it should run (ttyS1) and the gettydefs entry that should be used (m). The /etc/gettydefs file defines such characteristics as the default speed, parity, and the number of data bits. For example, the m entry, to which the previous inittab entry points, might look like this:

M19200 # B19200 CS8 CLOCAL # B19200 SANE -ISTRIP CLOCAL #@S login: # M19200

The fields are

label # initial_flags # final_flags #login_prompt # next_label

The label entry is what is being pointed to in the inittab file. The initial_ flags are the default serial line characteristics that are set, unless a terminal type is passed to getty. Normally, the only characteristic that needs to be passed is the speed. However, we also set HUPCL (hang up on last close).

The final_flags are set just before getty executes login. Here again, set the speed and HUPCL. However, we also set the terminal to SANE, which is actually several characteristics. (Look at the gettydefs man-page for more details.) We also set TAB3, which turns tabs into space; ECHOE, which echoes the erase character as a backspace-space-backspace combination; and IXANY, which enables any character to restart output if it is stopped by the XOFF character.

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Copyright 2002-2009 by James Mohr. Licensed under modified GNU Free Documentation License (Portions of this material originally published by Prentice Hall, Pearson Education, Inc). See here for details. All rights reserved.
  




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