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  &lt;div class=&quot;section&quot; id=&quot;module-pty&quot;&gt;
&lt;span id=&quot;pty-pseudo-terminal-utilities&quot;&gt;&lt;/span&gt;&lt;h1&gt;35.9. &lt;a class=&quot;reference internal&quot; href=&quot;#module-pty&quot; title=&quot;pty: Pseudo-Terminal Handling for Linux. (Linux)&quot;&gt;&lt;tt class=&quot;xref py py-mod docutils literal&quot;&gt;&lt;span class=&quot;pre&quot;&gt;pty&lt;/span&gt;&lt;/tt&gt;&lt;/a&gt; &amp;#8212; Pseudo-terminal utilities&lt;a class=&quot;headerlink&quot; href=&quot;#module-pty&quot; title=&quot;Permalink to this headline&quot;&gt;¶&lt;/a&gt;&lt;/h1&gt;
&lt;p&gt;The &lt;a class=&quot;reference internal&quot; href=&quot;#module-pty&quot; title=&quot;pty: Pseudo-Terminal Handling for Linux. (Linux)&quot;&gt;&lt;tt class=&quot;xref py py-mod docutils literal&quot;&gt;&lt;span class=&quot;pre&quot;&gt;pty&lt;/span&gt;&lt;/tt&gt;&lt;/a&gt; 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.&lt;/p&gt;
&lt;p&gt;Because pseudo-terminal handling is highly platform dependent, there is code to
do it only for Linux. (The Linux code is supposed to work on other platforms,
but hasn&amp;#8217;t been tested yet.)&lt;/p&gt;
&lt;p&gt;The &lt;a class=&quot;reference internal&quot; href=&quot;#module-pty&quot; title=&quot;pty: Pseudo-Terminal Handling for Linux. (Linux)&quot;&gt;&lt;tt class=&quot;xref py py-mod docutils literal&quot;&gt;&lt;span class=&quot;pre&quot;&gt;pty&lt;/span&gt;&lt;/tt&gt;&lt;/a&gt; module defines the following functions:&lt;/p&gt;
&lt;dl class=&quot;function&quot;&gt;
&lt;dt id=&quot;pty.fork&quot;&gt;
&lt;tt class=&quot;descclassname&quot;&gt;pty.&lt;/tt&gt;&lt;tt class=&quot;descname&quot;&gt;fork&lt;/tt&gt;&lt;big&gt;(&lt;/big&gt;&lt;big&gt;)&lt;/big&gt;&lt;a class=&quot;headerlink&quot; href=&quot;#pty.fork&quot; title=&quot;Permalink to this definition&quot;&gt;¶&lt;/a&gt;&lt;/dt&gt;
&lt;dd&gt;&lt;p&gt;Fork. Connect the child&amp;#8217;s controlling terminal to a pseudo-terminal. Return
value is &lt;tt class=&quot;docutils literal&quot;&gt;&lt;span class=&quot;pre&quot;&gt;(pid,&lt;/span&gt; &lt;span class=&quot;pre&quot;&gt;fd)&lt;/span&gt;&lt;/tt&gt;. Note that the child  gets &lt;em&gt;pid&lt;/em&gt; 0, and the &lt;em&gt;fd&lt;/em&gt; is
&lt;em&gt;invalid&lt;/em&gt;. The parent&amp;#8217;s return value is the &lt;em&gt;pid&lt;/em&gt; of the child, and &lt;em&gt;fd&lt;/em&gt; is a
file descriptor connected to the child&amp;#8217;s controlling terminal (and also to the
child&amp;#8217;s standard input and output).&lt;/p&gt;
&lt;/dd&gt;&lt;/dl&gt;

&lt;dl class=&quot;function&quot;&gt;
&lt;dt id=&quot;pty.openpty&quot;&gt;
&lt;tt class=&quot;descclassname&quot;&gt;pty.&lt;/tt&gt;&lt;tt class=&quot;descname&quot;&gt;openpty&lt;/tt&gt;&lt;big&gt;(&lt;/big&gt;&lt;big&gt;)&lt;/big&gt;&lt;a class=&quot;headerlink&quot; href=&quot;#pty.openpty&quot; title=&quot;Permalink to this definition&quot;&gt;¶&lt;/a&gt;&lt;/dt&gt;
&lt;dd&gt;&lt;p&gt;Open a new pseudo-terminal pair, using &lt;a class=&quot;reference internal&quot; href=&quot;os.html#os.openpty&quot; title=&quot;os.openpty&quot;&gt;&lt;tt class=&quot;xref py py-func docutils literal&quot;&gt;&lt;span class=&quot;pre&quot;&gt;os.openpty()&lt;/span&gt;&lt;/tt&gt;&lt;/a&gt; if possible, or
emulation code for generic Unix systems. Return a pair of file descriptors
&lt;tt class=&quot;docutils literal&quot;&gt;&lt;span class=&quot;pre&quot;&gt;(master,&lt;/span&gt; &lt;span class=&quot;pre&quot;&gt;slave)&lt;/span&gt;&lt;/tt&gt;, for the master and the slave end, respectively.&lt;/p&gt;
&lt;/dd&gt;&lt;/dl&gt;

&lt;dl class=&quot;function&quot;&gt;
&lt;dt id=&quot;pty.spawn&quot;&gt;
&lt;tt class=&quot;descclassname&quot;&gt;pty.&lt;/tt&gt;&lt;tt class=&quot;descname&quot;&gt;spawn&lt;/tt&gt;&lt;big&gt;(&lt;/big&gt;&lt;em&gt;argv&lt;/em&gt;&lt;span class=&quot;optional&quot;&gt;[&lt;/span&gt;, &lt;em&gt;master_read&lt;/em&gt;&lt;span class=&quot;optional&quot;&gt;[&lt;/span&gt;, &lt;em&gt;stdin_read&lt;/em&gt;&lt;span class=&quot;optional&quot;&gt;]&lt;/span&gt;&lt;span class=&quot;optional&quot;&gt;]&lt;/span&gt;&lt;big&gt;)&lt;/big&gt;&lt;a class=&quot;headerlink&quot; href=&quot;#pty.spawn&quot; title=&quot;Permalink to this definition&quot;&gt;¶&lt;/a&gt;&lt;/dt&gt;
&lt;dd&gt;&lt;p&gt;Spawn a process, and connect its controlling terminal with the current
process&amp;#8217;s standard io. This is often used to baffle programs which insist on
reading from the controlling terminal.&lt;/p&gt;
&lt;p&gt;The functions &lt;em&gt;master_read&lt;/em&gt; and &lt;em&gt;stdin_read&lt;/em&gt; should be functions which read from
a file descriptor. The defaults try to read 1024 bytes each time they are
called.&lt;/p&gt;
&lt;/dd&gt;&lt;/dl&gt;

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