<!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>System.Posix.Unistd</title><link href="ocean.css" rel="stylesheet" type="text/css" title="Ocean" /><script src="haddock-util.js" type="text/javascript"></script><script type="text/javascript">//<![CDATA[
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</script></head><body><div id="package-header"><ul class="links" id="page-menu"><li><a href="index.html">Contents</a></li><li><a href="doc-index.html">Index</a></li></ul><p class="caption">unix-2.5.1.1: POSIX functionality</p></div><div id="content"><div id="module-header"><table class="info"><tr><th>Portability</th><td>non-portable (requires POSIX)</td></tr><tr><th>Stability</th><td>provisional</td></tr><tr><th>Maintainer</th><td>libraries@haskell.org</td></tr><tr><th>Safe Haskell</th><td>Trustworthy</td></tr></table><p class="caption">System.Posix.Unistd</p></div><div id="table-of-contents"><p class="caption">Contents</p><ul><li><a href="#g:1">System environment
</a></li><li><a href="#g:2">Sleeping
</a></li></ul></div><div id="description"><p class="caption">Description</p><div class="doc"><p>POSIX miscellaneous stuff, mostly from unistd.h
</p></div></div><div id="synopsis"><p id="control.syn" class="caption expander" onclick="toggleSection('syn')">Synopsis</p><ul id="section.syn" class="hide" onclick="toggleSection('syn')"><li class="src short"><span class="keyword">data</span> <a href="#t:SystemID">SystemID</a> = <a href="#v:SystemID">SystemID</a> {<ul class="subs"><li><a href="#v:systemName">systemName</a> :: <a href="../base-4.5.1.0/Data-String.html#t:String">String</a></li><li><a href="#v:nodeName">nodeName</a> :: <a href="../base-4.5.1.0/Data-String.html#t:String">String</a></li><li><a href="#v:release">release</a> :: <a href="../base-4.5.1.0/Data-String.html#t:String">String</a></li><li><a href="#v:version">version</a> :: <a href="../base-4.5.1.0/Data-String.html#t:String">String</a></li><li><a href="#v:machine">machine</a> :: <a href="../base-4.5.1.0/Data-String.html#t:String">String</a></li></ul>}</li><li class="src short"><a href="#v:getSystemID">getSystemID</a> :: <a href="../base-4.5.1.0/System-IO.html#t:IO">IO</a> <a href="System-Posix-Unistd.html#t:SystemID">SystemID</a></li><li class="src short"><span class="keyword">data</span> <a href="#t:SysVar">SysVar</a> <ul class="subs"><li>= <a href="#v:ArgumentLimit">ArgumentLimit</a> </li><li>| <a href="#v:ChildLimit">ChildLimit</a> </li><li>| <a href="#v:ClockTick">ClockTick</a> </li><li>| <a href="#v:GroupLimit">GroupLimit</a> </li><li>| <a href="#v:OpenFileLimit">OpenFileLimit</a> </li><li>| <a href="#v:PosixVersion">PosixVersion</a> </li><li>| <a href="#v:HasSavedIDs">HasSavedIDs</a> </li><li>| <a href="#v:HasJobControl">HasJobControl</a> </li></ul></li><li class="src short"><a href="#v:getSysVar">getSysVar</a> :: <a href="System-Posix-Unistd.html#t:SysVar">SysVar</a> -> <a href="../base-4.5.1.0/System-IO.html#t:IO">IO</a> <a href="../base-4.5.1.0/Prelude.html#t:Integer">Integer</a></li><li class="src short"><a href="#v:sleep">sleep</a> :: <a href="../base-4.5.1.0/Data-Int.html#t:Int">Int</a> -> <a href="../base-4.5.1.0/System-IO.html#t:IO">IO</a> <a href="../base-4.5.1.0/Data-Int.html#t:Int">Int</a></li><li class="src short"><a href="#v:usleep">usleep</a> :: <a href="../base-4.5.1.0/Data-Int.html#t:Int">Int</a> -> <a href="../base-4.5.1.0/System-IO.html#t:IO">IO</a> ()</li><li class="src short"><a href="#v:nanosleep">nanosleep</a> :: <a href="../base-4.5.1.0/Prelude.html#t:Integer">Integer</a> -> <a href="../base-4.5.1.0/System-IO.html#t:IO">IO</a> ()</li></ul></div><div id="interface"><h1 id="g:1">System environment
</h1><div class="top"><p class="src"><span class="keyword">data</span> <a name="t:SystemID" class="def">SystemID</a> </p><div class="subs constructors"><p class="caption">Constructors</p><table><tr><td class="src"><a name="v:SystemID" class="def">SystemID</a></td><td class="doc empty"> </td></tr><tr><td colspan="2"><div class="subs fields"><p class="caption">Fields</p><dl><dt class="src"><a name="v:systemName" class="def">systemName</a> :: <a href="../base-4.5.1.0/Data-String.html#t:String">String</a></dt><dd class="doc empty"> </dd><dt class="src"><a name="v:nodeName" class="def">nodeName</a> :: <a href="../base-4.5.1.0/Data-String.html#t:String">String</a></dt><dd class="doc empty"> </dd><dt class="src"><a name="v:release" class="def">release</a> :: <a href="../base-4.5.1.0/Data-String.html#t:String">String</a></dt><dd class="doc empty"> </dd><dt class="src"><a name="v:version" class="def">version</a> :: <a href="../base-4.5.1.0/Data-String.html#t:String">String</a></dt><dd class="doc empty"> </dd><dt class="src"><a name="v:machine" class="def">machine</a> :: <a href="../base-4.5.1.0/Data-String.html#t:String">String</a></dt><dd class="doc empty"> </dd></dl><div class="clear"></div></div></td></tr></table></div></div><div class="top"><p class="src"><a name="v:getSystemID" class="def">getSystemID</a> :: <a href="../base-4.5.1.0/System-IO.html#t:IO">IO</a> <a href="System-Posix-Unistd.html#t:SystemID">SystemID</a></p></div><div class="top"><p class="src"><span class="keyword">data</span> <a name="t:SysVar" class="def">SysVar</a> </p><div class="subs constructors"><p class="caption">Constructors</p><table><tr><td class="src"><a name="v:ArgumentLimit" class="def">ArgumentLimit</a></td><td class="doc empty"> </td></tr><tr><td class="src"><a name="v:ChildLimit" class="def">ChildLimit</a></td><td class="doc empty"> </td></tr><tr><td class="src"><a name="v:ClockTick" class="def">ClockTick</a></td><td class="doc empty"> </td></tr><tr><td class="src"><a name="v:GroupLimit" class="def">GroupLimit</a></td><td class="doc empty"> </td></tr><tr><td class="src"><a name="v:OpenFileLimit" class="def">OpenFileLimit</a></td><td class="doc empty"> </td></tr><tr><td class="src"><a name="v:PosixVersion" class="def">PosixVersion</a></td><td class="doc empty"> </td></tr><tr><td class="src"><a name="v:HasSavedIDs" class="def">HasSavedIDs</a></td><td class="doc empty"> </td></tr><tr><td class="src"><a name="v:HasJobControl" class="def">HasJobControl</a></td><td class="doc empty"> </td></tr></table></div></div><div class="top"><p class="src"><a name="v:getSysVar" class="def">getSysVar</a> :: <a href="System-Posix-Unistd.html#t:SysVar">SysVar</a> -> <a href="../base-4.5.1.0/System-IO.html#t:IO">IO</a> <a href="../base-4.5.1.0/Prelude.html#t:Integer">Integer</a></p></div><h1 id="g:2">Sleeping
</h1><div class="top"><p class="src"><a name="v:sleep" class="def">sleep</a> :: <a href="../base-4.5.1.0/Data-Int.html#t:Int">Int</a> -> <a href="../base-4.5.1.0/System-IO.html#t:IO">IO</a> <a href="../base-4.5.1.0/Data-Int.html#t:Int">Int</a></p><div class="doc"><p>Sleep for the specified duration (in seconds). Returns the time remaining
(if the sleep was interrupted by a signal, for example).
</p><p>GHC Note: the comment for <code><a href="System-Posix-Unistd.html#v:usleep">usleep</a></code> also applies here.
</p></div></div><div class="top"><p class="src"><a name="v:usleep" class="def">usleep</a> :: <a href="../base-4.5.1.0/Data-Int.html#t:Int">Int</a> -> <a href="../base-4.5.1.0/System-IO.html#t:IO">IO</a> ()</p><div class="doc"><p>Sleep for the specified duration (in microseconds).
</p><p>GHC Note: <code><a href="../base-4.5.1.0/Control-Concurrent.html#v:threadDelay">threadDelay</a></code> is a better choice.
Without the <code>-threaded</code> option, <code><a href="System-Posix-Unistd.html#v:usleep">usleep</a></code> will block all other user
threads. Even with the <code>-threaded</code> option, <code><a href="System-Posix-Unistd.html#v:usleep">usleep</a></code> requires a
full OS thread to itself. <code><a href="../base-4.5.1.0/Control-Concurrent.html#v:threadDelay">threadDelay</a></code> has
neither of these shortcomings.
</p></div></div><div class="top"><p class="src"><a name="v:nanosleep" class="def">nanosleep</a> :: <a href="../base-4.5.1.0/Prelude.html#t:Integer">Integer</a> -> <a href="../base-4.5.1.0/System-IO.html#t:IO">IO</a> ()</p><div class="doc"><p>Sleep for the specified duration (in nanoseconds)
</p></div></div></div></div><div id="footer"><p>Produced by <a href="http://www.haskell.org/haddock/">Haddock</a> version 2.11.0</p></div></body></html>
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