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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">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> -&gt; <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">&nbsp;</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">&nbsp;</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">&nbsp;</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">&nbsp;</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">&nbsp;</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">&nbsp;</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> -&gt; <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.
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