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<H1><A NAME="SECTION0010800000000000000000">
8.8 <tt class="module">termios</tt> --
         POSIX style tty control</A>
</H1>

<P>
<A NAME="module-termios"></A>  
<p class="availability">Availability: <span
 class="platform">Unix</span>.</p>

<P>
<a id='l2h-3008' xml:id='l2h-3008'></a><a id='l2h-3009' xml:id='l2h-3009'></a>
<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
<span class="Unix">Unix</span> manual pages.  It is only available for those <span class="Unix">Unix</span> versions
that support POSIX <em>termios</em> 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 can be an integer file descriptor, such as
returned by <code>sys.stdin.fileno()</code>, or a file object, such as
<code>sys.stdin</code> itself.

<P>
This module also defines all the constants needed to work with the
functions provided here; these have the same name as their
counterparts in C.  Please refer to your system documentation for more
information on using these terminal control interfaces.

<P>
The module defines the following functions:

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><tt id='l2h-3010' xml:id='l2h-3010' class="function">tcgetattr</tt></b>(</nobr></td>
  <td><var>fd</var>)</td></tr></table></dt>
<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">VMIN</tt> and
<tt class="constant">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">termios</tt>
module.
</dl>

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><tt id='l2h-3011' xml:id='l2h-3011' class="function">tcsetattr</tt></b>(</nobr></td>
  <td><var>fd, when, attributes</var>)</td></tr></table></dt>
<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">TCSANOW</tt> to change immediately,
<tt class="constant">TCSADRAIN</tt> to change after transmitting all queued output,
or <tt class="constant">TCSAFLUSH</tt> to change after transmitting all queued
output and discarding all queued input.
</dl>

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><tt id='l2h-3012' xml:id='l2h-3012' class="function">tcsendbreak</tt></b>(</nobr></td>
  <td><var>fd, duration</var>)</td></tr></table></dt>
<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><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><tt id='l2h-3013' xml:id='l2h-3013' class="function">tcdrain</tt></b>(</nobr></td>
  <td><var>fd</var>)</td></tr></table></dt>
<dd>
Wait until all output written to file descriptor <var>fd</var> has been
transmitted.
</dl>

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><tt id='l2h-3014' xml:id='l2h-3014' class="function">tcflush</tt></b>(</nobr></td>
  <td><var>fd, queue</var>)</td></tr></table></dt>
<dd>
Discard queued data on file descriptor <var>fd</var>.  The <var>queue</var>
selector specifies which queue: <tt class="constant">TCIFLUSH</tt> for the input
queue, <tt class="constant">TCOFLUSH</tt> for the output queue, or
<tt class="constant">TCIOFLUSH</tt> for both queues.
</dl>

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><tt id='l2h-3015' xml:id='l2h-3015' class="function">tcflow</tt></b>(</nobr></td>
  <td><var>fd, action</var>)</td></tr></table></dt>
<dd>
Suspend or resume input or output on file descriptor <var>fd</var>.  The
<var>action</var> argument can be <tt class="constant">TCOOFF</tt> to suspend output,
<tt class="constant">TCOON</tt> to restart output, <tt class="constant">TCIOFF</tt> to suspend
input, or <tt class="constant">TCION</tt> to restart input.
</dl>

<P>
<div class="seealso">
  <p class="heading">See Also:</p>

  <dl compact="compact" class="seemodule">
    <dt>Module <b><tt class="module"><a href="module-tty.html">tty</a></tt>:</b>
    <dd>Convenience functions for common terminal control
                  operations.
  </dl>
</div>

<P>

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	54
	55	<H1><A NAME="SECTION0010800000000000000000">
	56	8.8 <tt class="module">termios</tt> --
	57	POSIX style tty control</A>
	58	</H1>
	59
	60	<P>
	61	<A NAME="module-termios"></A>
	62	<p class="availability">Availability: <span
	63	class="platform">Unix</span>.</p>
	64
65	<P>
66	<a id='l2h-3008' xml:id='l2h-3008'></a><a id='l2h-3009' xml:id='l2h-3009'></a>
67	<P>
68	This module provides an interface to the POSIX calls for tty I/O
69	control. For a complete description of these calls, see the POSIX or
70	<span class="Unix">Unix</span> manual pages. It is only available for those <span class="Unix">Unix</span> versions
71	that support POSIX <em>termios</em> style tty I/O control (and then
72	only if configured at installation time).
73
74	<P>
75	All functions in this module take a file descriptor <var>fd</var> as their
76	first argument. This can be an integer file descriptor, such as
77	returned by <code>sys.stdin.fileno()</code>, or a file object, such as
78	<code>sys.stdin</code> itself.
79
80	<P>
81	This module also defines all the constants needed to work with the
82	functions provided here; these have the same name as their
83	counterparts in C. Please refer to your system documentation for more
84	information on using these terminal control interfaces.
85
86	<P>
87	The module defines the following functions:
88
89	<P>
90	<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
91	<td><nobr><b><tt id='l2h-3010' xml:id='l2h-3010' class="function">tcgetattr</tt></b>(</nobr></td>
92	<td><var>fd</var>)</td></tr></table></dt>
93	<dd>
94	Return a list containing the tty attributes for file descriptor
95	<var>fd</var>, as follows: <code>[</code><var>iflag</var>, <var>oflag</var>, <var>cflag</var>,
96	<var>lflag</var>, <var>ispeed</var>, <var>ospeed</var>, <var>cc</var><code>]</code> where
97	<var>cc</var> is a list of the tty special characters (each a string of
98	length 1, except the items with indices <tt class="constant">VMIN</tt> and
99	<tt class="constant">VTIME</tt>, which are integers when these fields are
100	defined). The interpretation of the flags and the speeds as well as
101	the indexing in the <var>cc</var> array must be done using the symbolic
102	constants defined in the <tt class="module">termios</tt>
103	module.
104	</dl>
105
106	<P>
107	<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
108	<td><nobr><b><tt id='l2h-3011' xml:id='l2h-3011' class="function">tcsetattr</tt></b>(</nobr></td>
109	<td><var>fd, when, attributes</var>)</td></tr></table></dt>
110	<dd>
111	Set the tty attributes for file descriptor <var>fd</var> from the
112	<var>attributes</var>, which is a list like the one returned by
113	<tt class="function">tcgetattr()</tt>. The <var>when</var> argument determines when the
114	attributes are changed: <tt class="constant">TCSANOW</tt> to change immediately,
115	<tt class="constant">TCSADRAIN</tt> to change after transmitting all queued output,
116	or <tt class="constant">TCSAFLUSH</tt> to change after transmitting all queued
117	output and discarding all queued input.
118	</dl>
119
120	<P>
121	<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
122	<td><nobr><b><tt id='l2h-3012' xml:id='l2h-3012' class="function">tcsendbreak</tt></b>(</nobr></td>
123	<td><var>fd, duration</var>)</td></tr></table></dt>
124	<dd>
125	Send a break on file descriptor <var>fd</var>. A zero <var>duration</var> sends
126	a break for 0.25-0.5 seconds; a nonzero <var>duration</var> has a system
127	dependent meaning.
128	</dl>
129
130	<P>
131	<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
132	<td><nobr><b><tt id='l2h-3013' xml:id='l2h-3013' class="function">tcdrain</tt></b>(</nobr></td>
133	<td><var>fd</var>)</td></tr></table></dt>
134	<dd>
135	Wait until all output written to file descriptor <var>fd</var> has been
136	transmitted.
137	</dl>
138
139	<P>
140	<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
141	<td><nobr><b><tt id='l2h-3014' xml:id='l2h-3014' class="function">tcflush</tt></b>(</nobr></td>
142	<td><var>fd, queue</var>)</td></tr></table></dt>
143	<dd>
144	Discard queued data on file descriptor <var>fd</var>. The <var>queue</var>
145	selector specifies which queue: <tt class="constant">TCIFLUSH</tt> for the input
146	queue, <tt class="constant">TCOFLUSH</tt> for the output queue, or
147	<tt class="constant">TCIOFLUSH</tt> for both queues.
148	</dl>
149
150	<P>
151	<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
152	<td><nobr><b><tt id='l2h-3015' xml:id='l2h-3015' class="function">tcflow</tt></b>(</nobr></td>
153	<td><var>fd, action</var>)</td></tr></table></dt>
154	<dd>
155	Suspend or resume input or output on file descriptor <var>fd</var>. The
156	<var>action</var> argument can be <tt class="constant">TCOOFF</tt> to suspend output,
157	<tt class="constant">TCOON</tt> to restart output, <tt class="constant">TCIOFF</tt> to suspend
158	input, or <tt class="constant">TCION</tt> to restart input.
159	</dl>
160
161	<P>
162	<div class="seealso">
163	<p class="heading">See Also:</p>
164
165	<dl compact="compact" class="seemodule">
166	<dt>Module <b><tt class="module"><a href="module-tty.html">tty</a></tt>:</b>
167	<dd>Convenience functions for common terminal control
168	operations.
169	</dl>
170	</div>
171
172	<P>
173
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175	<div class='online-navigation'>
176	<!--Table of Child-Links-->
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178
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