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<H1><A NAME="SECTION0010800000000000000000">
8.8 <tt class="module">termios</tt> --
POSIX style tty control</A>
</H1>
<P>
<p class='availability'>Availability: <span
class='platform'>Unix</span>.</p>
<P>
<P>
This module provides an interface to the POSIX calls for tty I/O
control. For a complete description of these calls, see the POSIX or
Unix manual pages. It is only available for those Unix versions
that support POSIX <i>termios</i> style tty I/O control (and then
only if configured at installation time).
<P>
All functions in this module take a file descriptor <var>fd</var> as their
first argument. This must be an integer file descriptor, such as
returned by <code>sys.stdin.fileno()</code>.
<P>
This module should be used in conjunction with the
<tt class='module'><a href="module-TERMIOSuppercase.html" tppabs="http://www.python.org/doc/current/lib/module-TERMIOSuppercase.html">TERMIOS</a></tt> module,
which defines the relevant symbolic constants (see the next section).
<P>
The module defines the following functions:
<P>
<dl><dt><b><a name='l2h-1849'><tt class='function'>tcgetattr</tt></a></b> (<var>fd</var>)
<dd>
Return a list containing the tty attributes for file descriptor
<var>fd</var>, as follows: <code>[</code><var>iflag</var>, <var>oflag</var>, <var>cflag</var>,
<var>lflag</var>, <var>ispeed</var>, <var>ospeed</var>, <var>cc</var><code>]</code> where
<var>cc</var> is a list of the tty special characters (each a string of
length 1, except the items with indices <tt class="constant">TERMIOS.VMIN</tt> and
<tt class="constant">TERMIOS.VTIME</tt>, which are integers when these fields are
defined). The interpretation of the flags and the speeds as well as
the indexing in the <var>cc</var> array must be done using the symbolic
constants defined in the <tt class='module'><a href="module-TERMIOSuppercase.html" tppabs="http://www.python.org/doc/current/lib/module-TERMIOSuppercase.html">TERMIOS</a></tt>
module.
</dl>
<P>
<dl><dt><b><a name='l2h-1850'><tt class='function'>tcsetattr</tt></a></b> (<var>fd, when, attributes</var>)
<dd>
Set the tty attributes for file descriptor <var>fd</var> from the
<var>attributes</var>, which is a list like the one returned by
<tt class="function">tcgetattr()</tt>. The <var>when</var> argument determines when the
attributes are changed: <tt class="constant">TERMIOS.TCSANOW</tt> to change
immediately, <tt class="constant">TERMIOS.TCSADRAIN</tt> to change after transmitting
all queued output, or <tt class="constant">TERMIOS.TCSAFLUSH</tt> to change after
transmitting all queued output and discarding all queued input.
</dl>
<P>
<dl><dt><b><a name='l2h-1851'><tt class='function'>tcsendbreak</tt></a></b> (<var>fd, duration</var>)
<dd>
Send a break on file descriptor <var>fd</var>. A zero <var>duration</var> sends
a break for 0.25-0.5 seconds; a nonzero <var>duration</var> has a system
dependent meaning.
</dl>
<P>
<dl><dt><b><a name='l2h-1852'><tt class='function'>tcdrain</tt></a></b> (<var>fd</var>)
<dd>
Wait until all output written to file descriptor <var>fd</var> has been
transmitted.
</dl>
<P>
<dl><dt><b><a name='l2h-1853'><tt class='function'>tcflush</tt></a></b> (<var>fd, queue</var>)
<dd>
Discard queued data on file descriptor <var>fd</var>. The <var>queue</var>
selector specifies which queue: <tt class="constant">TERMIOS.TCIFLUSH</tt> for the
input queue, <tt class="constant">TERMIOS.TCOFLUSH</tt> for the output queue, or
<tt class="constant">TERMIOS.TCIOFLUSH</tt> for both queues.
</dl>
<P>
<dl><dt><b><a name='l2h-1854'><tt class='function'>tcflow</tt></a></b> (<var>fd, action</var>)
<dd>
Suspend or resume input or output on file descriptor <var>fd</var>. The
<var>action</var> argument can be <tt class="constant">TERMIOS.TCOOFF</tt> to suspend
output, <tt class="constant">TERMIOS.TCOON</tt> to restart output,
<tt class="constant">TERMIOS.TCIOFF</tt> to suspend input, or
<tt class="constant">TERMIOS.TCION</tt> to restart input.
</dl>
<P>
<div class='seealso'>
<p class='heading'><b>See Also:</b></p>
<dl compact class="seemodule">
<dt>Module <b><tt class='module'><a href="module-TERMIOSuppercase.html" tppabs="http://www.python.org/doc/current/lib/module-TERMIOSuppercase.html">TERMIOS</a></tt>:</b>
<dd>Constants for use with
<tt class="module">termios</tt>.
</dl>
<dl compact class="seemodule">
<dt>Module <b><tt class='module'><a href="module-tty.html" tppabs="http://www.python.org/doc/current/lib/module-tty.html">tty</a></tt>:</b>
<dd>Convenience functions for common terminal control
operations.
</dl>
</div>
<P>
<p><hr>
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