<!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.Exit</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[ window.onload = function () {pageLoad();setSynopsis("mini_System-Exit.html");}; //]]> </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">haskell2010-1.1.0.1: Compatibility with Haskell 2010</p></div><div id="content"><div id="module-header"><table class="info"><tr><th>Safe Haskell</th><td>Safe</td></tr></table><p class="caption">System.Exit</p></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:ExitCode">ExitCode</a> <ul class="subs"><li>= <a href="#v:ExitSuccess">ExitSuccess</a> </li><li>| <a href="#v:ExitFailure">ExitFailure</a> <a href="Prelude.html#t:Int">Int</a> </li></ul></li><li class="src short"><a href="#v:exitWith">exitWith</a> :: <a href="System-Exit.html#t:ExitCode">ExitCode</a> -> <a href="Prelude.html#t:IO">IO</a> a</li><li class="src short"><a href="#v:exitFailure">exitFailure</a> :: <a href="Prelude.html#t:IO">IO</a> a</li><li class="src short"><a href="#v:exitSuccess">exitSuccess</a> :: <a href="Prelude.html#t:IO">IO</a> a</li></ul></div><div id="interface"><h1>Documentation</h1><div class="top"><p class="src"><span class="keyword">data</span> <a name="t:ExitCode" class="def">ExitCode</a> <a href="../base-4.5.1.0/src/GHC-IO-Exception.html#ExitCode" class="link">Source</a></p><div class="doc"><p>Defines the exit codes that a program can return. </p></div><div class="subs constructors"><p class="caption">Constructors</p><table><tr><td class="src"><a name="v:ExitSuccess" class="def">ExitSuccess</a></td><td class="doc"><p>indicates successful termination; </p></td></tr><tr><td class="src"><a name="v:ExitFailure" class="def">ExitFailure</a> <a href="Prelude.html#t:Int">Int</a></td><td class="doc"><p>indicates program failure with an exit code. The exact interpretation of the code is operating-system dependent. In particular, some values may be prohibited (e.g. 0 on a POSIX-compliant system). </p></td></tr></table></div><div class="subs instances"><p id="control.i:ExitCode" class="caption collapser" onclick="toggleSection('i:ExitCode')">Instances</p><div id="section.i:ExitCode" class="show"><table><tr><td class="src"><a href="Prelude.html#t:Eq">Eq</a> <a href="System-Exit.html#t:ExitCode">ExitCode</a></td><td class="doc empty"> </td></tr><tr><td class="src"><a href="Prelude.html#t:Ord">Ord</a> <a href="System-Exit.html#t:ExitCode">ExitCode</a></td><td class="doc empty"> </td></tr><tr><td class="src"><a href="Prelude.html#t:Read">Read</a> <a href="System-Exit.html#t:ExitCode">ExitCode</a></td><td class="doc empty"> </td></tr><tr><td class="src"><a href="Prelude.html#t:Show">Show</a> <a href="System-Exit.html#t:ExitCode">ExitCode</a></td><td class="doc empty"> </td></tr><tr><td class="src"><a href="../base-4.5.1.0/Data-Typeable-Internal.html#t:Typeable">Typeable</a> <a href="System-Exit.html#t:ExitCode">ExitCode</a></td><td class="doc empty"> </td></tr><tr><td class="src"><a href="../base-4.5.1.0/Control-Exception-Base.html#t:Exception">Exception</a> <a href="System-Exit.html#t:ExitCode">ExitCode</a></td><td class="doc empty"> </td></tr></table></div></div></div><div class="top"><p class="src"><a name="v:exitWith" class="def">exitWith</a> :: <a href="System-Exit.html#t:ExitCode">ExitCode</a> -> <a href="Prelude.html#t:IO">IO</a> a</p><div class="doc"><p>Computation <code><code><a href="System-Exit.html#v:exitWith">exitWith</a></code> code</code> terminates the program, returning <code>code</code> to the program's caller. The caller may interpret the return code as it wishes, but the program should return <code><a href="System-Exit.html#v:ExitSuccess">ExitSuccess</a></code> to mean normal completion, and <code><code><a href="System-Exit.html#v:ExitFailure">ExitFailure</a></code> n</code> to mean that the program encountered a problem from which it could not recover. The value <code><a href="System-Exit.html#v:exitFailure">exitFailure</a></code> is equal to <code><code><a href="System-Exit.html#v:exitWith">exitWith</a></code> (<code><a href="System-Exit.html#v:ExitFailure">ExitFailure</a></code> exitfail)</code>, where <code>exitfail</code> is implementation-dependent. <code><a href="System-Exit.html#v:exitWith">exitWith</a></code> bypasses the error handling in the I/O monad and cannot be intercepted by <code><a href="Prelude.html#v:catch">catch</a></code> from the <code>Prelude</code>. </p></div></div><div class="top"><p class="src"><a name="v:exitFailure" class="def">exitFailure</a> :: <a href="Prelude.html#t:IO">IO</a> a<a href="../base-4.5.1.0/src/System-Exit.html#exitFailure" class="link">Source</a></p><div class="doc"><p>The computation <code><a href="System-Exit.html#v:exitFailure">exitFailure</a></code> is equivalent to <code><a href="../base-4.5.1.0/System-Exit.html#v:exitWith">exitWith</a></code> <code>(</code><code><a href="System-Exit.html#v:ExitFailure">ExitFailure</a></code> <em>exitfail</em><code>)</code>, where <em>exitfail</em> is implementation-dependent. </p></div></div><div class="top"><p class="src"><a name="v:exitSuccess" class="def">exitSuccess</a> :: <a href="Prelude.html#t:IO">IO</a> a<a href="../base-4.5.1.0/src/System-Exit.html#exitSuccess" class="link">Source</a></p><div class="doc"><p>The computation <code><a href="System-Exit.html#v:exitSuccess">exitSuccess</a></code> is equivalent to <code><a href="../base-4.5.1.0/System-Exit.html#v:exitWith">exitWith</a></code> <code><a href="System-Exit.html#v:ExitSuccess">ExitSuccess</a></code>, It terminates the program successfully. </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>