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<div class="section" id="unix-specific-services">
<span id="unix"></span><h1>36. Unix Specific Services<a class="headerlink" href="#unix-specific-services" title="Permalink to this headline">¶</a></h1>
<p>The modules described in this chapter provide interfaces to features that are
unique to the Unix operating system, or in some cases to some or many variants
of it. Here’s an overview:</p>
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<li class="toctree-l1"><a class="reference external" href="posix.html">36.1. <tt class="docutils literal"><span class="pre">posix</span></tt> — The most common POSIX system calls</a><ul>
<li class="toctree-l2"><a class="reference external" href="posix.html#large-file-support">36.1.1. Large File Support</a></li>
<li class="toctree-l2"><a class="reference external" href="posix.html#notable-module-contents">36.1.2. Notable Module Contents</a></li>
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<li class="toctree-l1"><a class="reference external" href="pwd.html">36.2. <tt class="docutils literal"><span class="pre">pwd</span></tt> — The password database</a></li>
<li class="toctree-l1"><a class="reference external" href="spwd.html">36.3. <tt class="docutils literal"><span class="pre">spwd</span></tt> — The shadow password database</a></li>
<li class="toctree-l1"><a class="reference external" href="grp.html">36.4. <tt class="docutils literal"><span class="pre">grp</span></tt> — The group database</a></li>
<li class="toctree-l1"><a class="reference external" href="crypt.html">36.5. <tt class="docutils literal"><span class="pre">crypt</span></tt> — Function to check Unix passwords</a></li>
<li class="toctree-l1"><a class="reference external" href="dl.html">36.6. <tt class="docutils literal"><span class="pre">dl</span></tt> — Call C functions in shared objects</a><ul>
<li class="toctree-l2"><a class="reference external" href="dl.html#dl-objects">36.6.1. Dl Objects</a></li>
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<li class="toctree-l1"><a class="reference external" href="termios.html">36.7. <tt class="docutils literal"><span class="pre">termios</span></tt> — POSIX style tty control</a><ul>
<li class="toctree-l2"><a class="reference external" href="termios.html#example">36.7.1. Example</a></li>
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<li class="toctree-l1"><a class="reference external" href="tty.html">36.8. <tt class="docutils literal"><span class="pre">tty</span></tt> — Terminal control functions</a></li>
<li class="toctree-l1"><a class="reference external" href="pty.html">36.9. <tt class="docutils literal"><span class="pre">pty</span></tt> — Pseudo-terminal utilities</a></li>
<li class="toctree-l1"><a class="reference external" href="fcntl.html">36.10. <tt class="docutils literal"><span class="pre">fcntl</span></tt> — The <tt class="docutils literal"><span class="pre">fcntl()</span></tt> and <tt class="docutils literal"><span class="pre">ioctl()</span></tt> system calls</a></li>
<li class="toctree-l1"><a class="reference external" href="pipes.html">36.11. <tt class="docutils literal"><span class="pre">pipes</span></tt> — Interface to shell pipelines</a><ul>
<li class="toctree-l2"><a class="reference external" href="pipes.html#template-objects">36.11.1. Template Objects</a></li>
</ul>
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<li class="toctree-l1"><a class="reference external" href="posixfile.html">36.12. <tt class="docutils literal"><span class="pre">posixfile</span></tt> — File-like objects with locking support</a></li>
<li class="toctree-l1"><a class="reference external" href="resource.html">36.13. <tt class="docutils literal"><span class="pre">resource</span></tt> — Resource usage information</a><ul>
<li class="toctree-l2"><a class="reference external" href="resource.html#resource-limits">36.13.1. Resource Limits</a></li>
<li class="toctree-l2"><a class="reference external" href="resource.html#resource-usage">36.13.2. Resource Usage</a></li>
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<li class="toctree-l1"><a class="reference external" href="nis.html">36.14. <tt class="docutils literal"><span class="pre">nis</span></tt> — Interface to Sun’s NIS (Yellow Pages)</a></li>
<li class="toctree-l1"><a class="reference external" href="syslog.html">36.15. <tt class="docutils literal"><span class="pre">syslog</span></tt> — Unix syslog library routines</a></li>
<li class="toctree-l1"><a class="reference external" href="commands.html">36.16. <tt class="docutils literal"><span class="pre">commands</span></tt> — Utilities for running commands</a></li>
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