blob: a16ae11d07a4bdf050669e25653375abebc0bc44 [file] [log] [blame]
<html lang="en">
<head>
<title>Pseudo-Terminals - The GNU C Library</title>
<meta http-equiv="Content-Type" content="text/html">
<meta name="description" content="The GNU C Library">
<meta name="generator" content="makeinfo 4.13">
<link title="Top" rel="start" href="index.html#Top">
<link rel="up" href="Low_002dLevel-Terminal-Interface.html#Low_002dLevel-Terminal-Interface" title="Low-Level Terminal Interface">
<link rel="prev" href="Noncanon-Example.html#Noncanon-Example" title="Noncanon Example">
<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage">
<!--
This file documents the GNU C library.
This is Edition 0.12, last updated 2007-10-27,
of `The GNU C Library Reference Manual', for version
2.8 (Sourcery G++ Lite 2011.03-41).
Copyright (C) 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2001, 2002,
2003, 2007, 2008, 2010 Free Software Foundation, Inc.
Permission is granted to copy, distribute and/or modify this document
under the terms of the GNU Free Documentation License, Version 1.3 or
any later version published by the Free Software Foundation; with the
Invariant Sections being ``Free Software Needs Free Documentation''
and ``GNU Lesser General Public License'', the Front-Cover texts being
``A GNU Manual'', and with the Back-Cover Texts as in (a) below. A
copy of the license is included in the section entitled "GNU Free
Documentation License".
(a) The FSF's Back-Cover Text is: ``You have the freedom to
copy and modify this GNU manual. Buying copies from the FSF
supports it in developing GNU and promoting software freedom.''-->
<meta http-equiv="Content-Style-Type" content="text/css">
<style type="text/css"><!--
pre.display { font-family:inherit }
pre.format { font-family:inherit }
pre.smalldisplay { font-family:inherit; font-size:smaller }
pre.smallformat { font-family:inherit; font-size:smaller }
pre.smallexample { font-size:smaller }
pre.smalllisp { font-size:smaller }
span.sc { font-variant:small-caps }
span.roman { font-family:serif; font-weight:normal; }
span.sansserif { font-family:sans-serif; font-weight:normal; }
--></style>
<link rel="stylesheet" type="text/css" href="../cs.css">
</head>
<body>
<div class="node">
<a name="Pseudo-Terminals"></a>
<a name="Pseudo_002dTerminals"></a>
<p>
Previous:&nbsp;<a rel="previous" accesskey="p" href="Noncanon-Example.html#Noncanon-Example">Noncanon Example</a>,
Up:&nbsp;<a rel="up" accesskey="u" href="Low_002dLevel-Terminal-Interface.html#Low_002dLevel-Terminal-Interface">Low-Level Terminal Interface</a>
<hr>
</div>
<h3 class="section">17.8 Pseudo-Terminals</h3>
<p><a name="index-pseudo_002dterminals-2023"></a>
A <dfn>pseudo-terminal</dfn> is a special interprocess communication channel
that acts like a terminal. One end of the channel is called the
<dfn>master</dfn> side or <dfn>master pseudo-terminal device</dfn>, the other side
is called the <dfn>slave</dfn> side. Data written to the master side is
received by the slave side as if it was the result of a user typing at
an ordinary terminal, and data written to the slave side is sent to the
master side as if it was written on an ordinary terminal.
<p>Pseudo terminals are the way programs like <code>xterm</code> and <code>emacs</code>
implement their terminal emulation functionality.
<ul class="menu">
<li><a accesskey="1" href="Allocation.html#Allocation">Allocation</a>: Allocating a pseudo terminal.
<li><a accesskey="2" href="Pseudo_002dTerminal-Pairs.html#Pseudo_002dTerminal-Pairs">Pseudo-Terminal Pairs</a>: How to open both sides of a
pseudo-terminal in a single operation.
</ul>
</body></html>