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<H1><A NAME="SECTION0010100000000000000000">
8.1 <tt class="module">posix</tt> --
         The most common POSIX system calls</A>
</H1>

<P>
<A NAME="module-posix"></A>  
<p class="availability">Availability: <span
 class="platform">Unix</span>.</p>

<P>
This module provides access to operating system functionality that is
standardized by the C Standard and the POSIX standard (a thinly
disguised <span class="Unix">Unix</span> interface).

<P>
<strong>Do not import this module directly.</strong>  Instead, import the
module <tt class="module"><a href="module-os.html">os</a></tt>, which provides a <em>portable</em> version of this
interface.  On <span class="Unix">Unix</span>, the <tt class="module"><a href="module-os.html">os</a></tt> module provides a superset of
the <tt class="module">posix</tt> interface.  On non-<span class="Unix">Unix</span> operating systems the
<tt class="module">posix</tt> module is not available, but a subset is always
available through the <tt class="module"><a href="module-os.html">os</a></tt> interface.  Once <tt class="module"><a href="module-os.html">os</a></tt> is
imported, there is <em>no</em> performance penalty in using it instead
of <tt class="module">posix</tt>.  In addition, <tt class="module"><a href="module-os.html">os</a></tt><a id='l2h-2969' xml:id='l2h-2969'></a>
provides some additional functionality, such as automatically calling
<tt class="function">putenv()</tt> when an entry in <code>os.environ</code> is changed.

<P>
The descriptions below are very terse; refer to the corresponding
<span class="Unix">Unix</span> manual (or POSIX documentation) entry for more information.
Arguments called <var>path</var> refer to a pathname given as a string.

<P>
Errors are reported as exceptions; the usual exceptions are given for
type errors, while errors reported by the system calls raise
<tt class="exception">error</tt> (a synonym for the standard exception
<tt class="exception">OSError</tt>), described below.

<P>

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	17	<title>8.1 posix -- The most common POSIX system calls</title>
	18	</head>
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	20	<DIV CLASS="navigation">
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	54
	55	<H1><A NAME="SECTION0010100000000000000000">
	56	8.1 <tt class="module">posix</tt> --
	57	The most common POSIX system calls</A>
	58	</H1>
	59
	60	<P>
	61	<A NAME="module-posix"></A>
	62	<p class="availability">Availability: <span
	63	class="platform">Unix</span>.</p>
	64
65	<P>
66	This module provides access to operating system functionality that is
67	standardized by the C Standard and the POSIX standard (a thinly
68	disguised <span class="Unix">Unix</span> interface).
69
70	<P>
71	<strong>Do not import this module directly.</strong> Instead, import the
72	module <tt class="module"><a href="module-os.html">os</a></tt>, which provides a <em>portable</em> version of this
73	interface. On <span class="Unix">Unix</span>, the <tt class="module"><a href="module-os.html">os</a></tt> module provides a superset of
74	the <tt class="module">posix</tt> interface. On non-<span class="Unix">Unix</span> operating systems the
75	<tt class="module">posix</tt> module is not available, but a subset is always
76	available through the <tt class="module"><a href="module-os.html">os</a></tt> interface. Once <tt class="module"><a href="module-os.html">os</a></tt> is
77	imported, there is <em>no</em> performance penalty in using it instead
78	of <tt class="module">posix</tt>. In addition, <tt class="module"><a href="module-os.html">os</a></tt><a id='l2h-2969' xml:id='l2h-2969'></a>
79	provides some additional functionality, such as automatically calling
80	<tt class="function">putenv()</tt> when an entry in <code>os.environ</code> is changed.
81
82	<P>
83	The descriptions below are very terse; refer to the corresponding
84	<span class="Unix">Unix</span> manual (or POSIX documentation) entry for more information.
85	Arguments called <var>path</var> refer to a pathname given as a string.
86
87	<P>
88	Errors are reported as exceptions; the usual exceptions are given for
89	type errors, while errors reported by the system calls raise
90	<tt class="exception">error</tt> (a synonym for the standard exception
91	<tt class="exception">OSError</tt>), described below.
92
93	<P>
94
95	<p><br /></p><hr class='online-navigation' />
96	<div class='online-navigation'>
97	<!--Table of Child-Links-->
98	<A NAME="CHILD_LINKS"><STRONG>Subsections</STRONG></a>
99
100	<UL CLASS="ChildLinks">
101	<LI><A href="posix-large-files.html">8.1.1 Large File Support</a>
102	<LI><A href="posix-contents.html">8.1.2 Module Contents</a>
103	</ul>
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