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<title>8.10 pty -- Pseudo-terminal utilities</title>
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<H1><A NAME="SECTION00101000000000000000000">
8.10 <tt class="module">pty</tt> --
         Pseudo-terminal utilities</A>
</H1>
<A NAME="module-pty"></A>
<p class="availability">Availability: <span
 class="platform">IRIX, Linux</span>.</p>

<P>
The <tt class="module">pty</tt> module defines operations for handling the
pseudo-terminal concept: starting another process and being able to
write to and read from its controlling terminal programmatically.

<P>
Because pseudo-terminal handling is highly platform dependant, there
is code to do it only for SGI and Linux. (The Linux code is supposed
to work on other platforms, but hasn't been tested yet.)

<P>
The <tt class="module">pty</tt> module defines the following functions:

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><tt id='l2h-3020' xml:id='l2h-3020' class="function">fork</tt></b>(</nobr></td>
  <td><var></var>)</td></tr></table></dt>
<dd>
Fork. Connect the child's controlling terminal to a pseudo-terminal.
Return value is <code>(<var>pid</var>, <var>fd</var>)</code>. Note that the child
gets <var>pid</var> 0, and the <var>fd</var> is <em>invalid</em>. The parent's
return value is the <var>pid</var> of the child, and <var>fd</var> is a file
descriptor connected to the child's controlling terminal (and also
to the child's standard input and output).
</dl>

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><tt id='l2h-3021' xml:id='l2h-3021' class="function">openpty</tt></b>(</nobr></td>
  <td><var></var>)</td></tr></table></dt>
<dd>
Open a new pseudo-terminal pair, using <tt class="function">os.openpty()</tt> if
possible, or emulation code for SGI and generic <span class="Unix">Unix</span> systems.
Return a pair of file descriptors <code>(<var>master</var>, <var>slave</var>)</code>,
for the master and the slave end, respectively.
</dl>

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><tt id='l2h-3022' xml:id='l2h-3022' class="function">spawn</tt></b>(</nobr></td>
  <td><var>argv</var><big>[</big><var>, master_read</var><big>[</big><var>, stdin_read</var><big>]</big><var></var><big>]</big><var></var>)</td></tr></table></dt>
<dd>
Spawn a process, and connect its controlling terminal with the current
process's standard io. This is often used to baffle programs which
insist on reading from the controlling terminal.

<P>
The functions <var>master_read</var> and <var>stdin_read</var> should be
functions which read from a file-descriptor. The defaults try to read
1024 bytes each time they are called.
</dl>

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<span class="release-info">Release 2.4.2, documentation updated on 28 September 2005.</span>
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