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<!-- %MENU% How to change the characteristics of a terminal device -->
<h2 class="chapter">17 Low-Level Terminal Interface</h2>

<p>This chapter describes functions that are specific to terminal devices. 
You can use these functions to do things like turn off input echoing;
set serial line characteristics such as line speed and flow control; and
change which characters are used for end-of-file, command-line editing,
sending signals, and similar control functions.

   <p>Most of the functions in this chapter operate on file descriptors. 
See <a href="Low_002dLevel-I_002fO.html#Low_002dLevel-I_002fO">Low-Level I/O</a>, for more information about what a file
descriptor is and how to open a file descriptor for a terminal device.

<ul class="menu">
<li><a accesskey="1" href="Is-It-a-Terminal.html#Is-It-a-Terminal">Is It a Terminal</a>:             How to determine if a file is a terminal
			         device, and what its name is. 
<li><a accesskey="2" href="I_002fO-Queues.html#I_002fO-Queues">I/O Queues</a>:                   About flow control and typeahead. 
<li><a accesskey="3" href="Canonical-or-Not.html#Canonical-or-Not">Canonical or Not</a>:             Two basic styles of input processing. 
<li><a accesskey="4" href="Terminal-Modes.html#Terminal-Modes">Terminal Modes</a>:               How to examine and modify flags controlling
			         details of terminal I/O: echoing,
                                 signals, editing.  Posix. 
<li><a accesskey="5" href="BSD-Terminal-Modes.html#BSD-Terminal-Modes">BSD Terminal Modes</a>:           BSD compatible terminal mode setting
<li><a accesskey="6" href="Line-Control.html#Line-Control">Line Control</a>:                 Sending break sequences, clearing
                                 terminal buffers ... 
<li><a accesskey="7" href="Noncanon-Example.html#Noncanon-Example">Noncanon Example</a>:             How to read single characters without echo. 
<li><a accesskey="8" href="Pseudo_002dTerminals.html#Pseudo_002dTerminals">Pseudo-Terminals</a>:             How to open a pseudo-terminal. 
</ul>

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