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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>35.9. pty — Pseudo-terminal utilities — Python v2.6.6 documentation</title> <link rel="stylesheet" href="../_static/default.css" type="text/css" /> <link rel="stylesheet" href="../_static/pygments.css" type="text/css" /> <script type="text/javascript"> var DOCUMENTATION_OPTIONS = { URL_ROOT: '../', VERSION: '2.6.6', COLLAPSE_MODINDEX: false, FILE_SUFFIX: '.html', HAS_SOURCE: true }; </script> <script type="text/javascript" src="../_static/jquery.js"></script> <script type="text/javascript" src="../_static/doctools.js"></script> <link rel="search" type="application/opensearchdescription+xml" title="Search within Python v2.6.6 documentation" href="../_static/opensearch.xml"/> <link rel="author" title="About these documents" href="../about.html" /> <link rel="copyright" title="Copyright" href="../copyright.html" /> <link rel="top" title="Python v2.6.6 documentation" href="../index.html" /> <link rel="up" title="35. 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Unix Specific Services</a> »</li> </ul> </div> <div class="document"> <div class="documentwrapper"> <div class="bodywrapper"> <div class="body"> <div class="section" id="module-pty"> <h1>35.9. <tt class="xref docutils literal"><span class="pre">pty</span></tt> — Pseudo-terminal utilities<a class="headerlink" href="#module-pty" title="Permalink to this headline">¶</a></h1> <p><em>Platforms: </em>Linux</p> <p>The <tt class="xref docutils literal"><span class="pre">pty</span></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> <p>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’t been tested yet.)</p> <p>The <tt class="xref docutils literal"><span class="pre">pty</span></tt> module defines the following functions:</p> <dl class="function"> <dt id="pty.fork"> <tt class="descclassname">pty.</tt><tt class="descname">fork</tt><big>(</big><big>)</big><a class="headerlink" href="#pty.fork" title="Permalink to this definition">¶</a></dt> <dd>Fork. Connect the child’s controlling terminal to a pseudo-terminal. Return value is <tt class="docutils literal"><span class="pre">(pid,</span> <span class="pre">fd)</span></tt>. Note that the child gets <em>pid</em> 0, and the <em>fd</em> is <em>invalid</em>. The parent’s return value is the <em>pid</em> of the child, and <em>fd</em> is a file descriptor connected to the child’s controlling terminal (and also to the child’s standard input and output).</dd></dl> <dl class="function"> <dt id="pty.openpty"> <tt class="descclassname">pty.</tt><tt class="descname">openpty</tt><big>(</big><big>)</big><a class="headerlink" href="#pty.openpty" title="Permalink to this definition">¶</a></dt> <dd>Open a new pseudo-terminal pair, using <a title="os.openpty" class="reference external" href="os.html#os.openpty"><tt class="xref docutils literal"><span class="pre">os.openpty()</span></tt></a> if possible, or emulation code for generic Unix systems. Return a pair of file descriptors <tt class="docutils literal"><span class="pre">(master,</span> <span class="pre">slave)</span></tt>, for the master and the slave end, respectively.</dd></dl> <dl class="function"> <dt id="pty.spawn"> <tt class="descclassname">pty.</tt><tt class="descname">spawn</tt><big>(</big><em>argv</em><span class="optional">[</span>, <em>master_read</em><span class="optional">[</span>, <em>stdin_read</em><span class="optional">]</span><span class="optional">]</span><big>)</big><a class="headerlink" href="#pty.spawn" title="Permalink to this definition">¶</a></dt> <dd><p>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> <p>The functions <em>master_read</em> and <em>stdin_read</em> should be functions which read from a file descriptor. The defaults try to read 1024 bytes each time they are called.</p> </dd></dl> </div> </div> </div> </div> <div class="sphinxsidebar"> <div class="sphinxsidebarwrapper"> <h4>Previous topic</h4> <p class="topless"><a href="tty.html" title="previous chapter">35.8. <tt class="docutils literal"><span class="pre">tty</span></tt> — Terminal control functions</a></p> <h4>Next topic</h4> <p class="topless"><a href="fcntl.html" title="next chapter">35.10. <tt class="docutils literal docutils literal docutils literal"><span class="pre">fcntl</span></tt> — The <tt class="docutils literal docutils literal docutils literal"><span class="pre">fcntl()</span></tt> and <tt class="docutils literal docutils literal docutils literal"><span class="pre">ioctl()</span></tt> system calls</a></p> <h3>This Page</h3> <ul class="this-page-menu"> <li><a href="../bugs.html">Report a Bug</a></li> <li><a href="../_sources/library/pty.txt" rel="nofollow">Show Source</a></li> </ul> <div id="searchbox" style="display: none"> <h3>Quick search</h3> <form class="search" action="../search.html" method="get"> <input type="text" name="q" size="18" /> <input type="submit" value="Go" /> <input type="hidden" name="check_keywords" value="yes" /> <input type="hidden" name="area" value="default" /> </form> <p class="searchtip" style="font-size: 90%"> Enter search terms or a module, class or function name. </p> </div> <script type="text/javascript">$('#searchbox').show(0);</script> </div> </div> <div class="clearer"></div> </div> <div class="related"> <h3>Navigation</h3> <ul> <li class="right" style="margin-right: 10px"> <a href="../genindex.html" title="General Index" >index</a></li> <li class="right" > <a href="../modindex.html" title="Global Module Index" >modules</a> |</li> <li class="right" > <a href="fcntl.html" title="35.10. fcntl — The fcntl() and ioctl() system calls" >next</a> |</li> <li class="right" > <a href="tty.html" title="35.8. tty — Terminal control functions" >previous</a> |</li> <li><img src="../_static/py.png" alt="" style="vertical-align: middle; margin-top: -1px"/></li> <li><a href="../index.html">Python v2.6.6 documentation</a> »</li> <li><a href="index.html" >The Python Standard Library</a> »</li> <li><a href="unix.html" >35. 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