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ghc-base-devel-4.2.0.2-8.6.fc14.x86_64.rpm

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>System.Exit</TITLE
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>base-4.2.0.2: Basic libraries</TD
><TD CLASS="topbut"
><A HREF="index.html"
>Contents</A
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>Index</A
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><FONT SIZE="6"
>System.Exit</FONT
></TD
><TD ALIGN="right"
><TABLE CLASS="narrow" CELLSPACING="0" CELLPADDING="0"
><TR
><TD CLASS="infohead"
>Portability</TD
><TD CLASS="infoval"
>portable</TD
></TR
><TR
><TD CLASS="infohead"
>Stability</TD
><TD CLASS="infoval"
>provisional</TD
></TR
><TR
><TD CLASS="infohead"
>Maintainer</TD
><TD CLASS="infoval"
>libraries@haskell.org</TD
></TR
></TABLE
></TD
></TR
></TABLE
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="section1"
>Description</TD
></TR
><TR
><TD CLASS="doc"
>Exiting the program.
</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="section1"
>Synopsis</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="body"
><TABLE CLASS="vanilla" CELLSPACING="0" CELLPADDING="0"
><TR
><TD CLASS="decl"
><TABLE CLASS="vanilla" CELLSPACING="0" CELLPADDING="0"
><TR
><TD CLASS="decl"
><SPAN CLASS="keyword"
>data</SPAN
>  <A HREF="#t%3AExitCode"
>ExitCode</A
>  </TD
></TR
><TR
><TD CLASS="body"
><TABLE CLASS="vanilla" CELLSPACING="0" CELLPADDING="0"
><TR
><TD CLASS="decl"
>= <A HREF="#v%3AExitSuccess"
>ExitSuccess</A
></TD
></TR
><TR
><TD CLASS="decl"
>| <A HREF="#v%3AExitFailure"
>ExitFailure</A
> <A HREF="Data-Int.html#t%3AInt"
>Int</A
></TD
></TR
></TABLE
></TD
></TR
></TABLE
></TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AexitWith"
>exitWith</A
> ::  <A HREF="System-Exit.html#t%3AExitCode"
>ExitCode</A
> -&gt; <A HREF="System-IO.html#t%3AIO"
>IO</A
> a</TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AexitFailure"
>exitFailure</A
> ::  <A HREF="System-IO.html#t%3AIO"
>IO</A
> a</TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AexitSuccess"
>exitSuccess</A
> ::  <A HREF="System-IO.html#t%3AIO"
>IO</A
> a</TD
></TR
></TABLE
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="section1"
>Documentation</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><SPAN CLASS="keyword"
>data</SPAN
>  <A NAME="t:ExitCode"
><A NAME="t%3AExitCode"
></A
></A
><B
>ExitCode</B
>  </TD
></TR
><TR
><TD CLASS="body"
><TABLE CLASS="vanilla" CELLSPACING="0" CELLPADDING="0"
><TR
><TD CLASS="section4"
>Constructors</TD
></TR
><TR
><TD CLASS="body"
><TABLE CLASS="vanilla" CELLSPACING="1" CELLPADDING="0"
><TR
><TD CLASS="arg"
><A NAME="v:ExitSuccess"
><A NAME="v%3AExitSuccess"
></A
></A
><B
>ExitSuccess</B
></TD
><TD CLASS="rdoc"
>indicates successful termination;
</TD
></TR
><TR
><TD CLASS="arg"
><A NAME="v:ExitFailure"
><A NAME="v%3AExitFailure"
></A
></A
><B
>ExitFailure</B
> <A HREF="Data-Int.html#t%3AInt"
>Int</A
></TD
><TD CLASS="rdoc"
>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).
</TD
></TR
></TABLE
></TD
></TR
><TR
><TD CLASS="section4"
><IMG SRC="minus.gif" CLASS="coll" ONCLICK="toggle(this,'i:ExitCode')" ALT="show/hide"
> Instances</TD
></TR
><TR
><TD CLASS="body"
><DIV ID="i:ExitCode" STYLE="display:block;"
><TABLE CLASS="vanilla" CELLSPACING="1" CELLPADDING="0"
><TR
><TD CLASS="decl"
><A HREF="Data-Eq.html#t%3AEq"
>Eq</A
> <A HREF="System-Exit.html#t%3AExitCode"
>ExitCode</A
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="Data-Ord.html#t%3AOrd"
>Ord</A
> <A HREF="System-Exit.html#t%3AExitCode"
>ExitCode</A
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="Text-Read.html#t%3ARead"
>Read</A
> <A HREF="System-Exit.html#t%3AExitCode"
>ExitCode</A
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="Text-Show.html#t%3AShow"
>Show</A
> <A HREF="System-Exit.html#t%3AExitCode"
>ExitCode</A
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="Data-Typeable.html#t%3ATypeable"
>Typeable</A
> <A HREF="System-Exit.html#t%3AExitCode"
>ExitCode</A
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="Control-Exception-Base.html#t%3AException"
>Exception</A
> <A HREF="System-Exit.html#t%3AExitCode"
>ExitCode</A
></TD
></TR
></TABLE
></DIV
></TD
></TR
></TABLE
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:exitWith"
><A NAME="v%3AexitWith"
></A
></A
><B
>exitWith</B
> ::  <A HREF="System-Exit.html#t%3AExitCode"
>ExitCode</A
> -&gt; <A HREF="System-IO.html#t%3AIO"
>IO</A
> a</TD
></TR
><TR
><TD CLASS="doc"
><P
>Computation <TT
><A HREF="System-Exit.html#v%3AexitWith"
>exitWith</A
></TT
> <TT
>code</TT
> throws <TT
><A HREF="System-Exit.html#t%3AExitCode"
>ExitCode</A
></TT
> <TT
>code</TT
>.
 Normally this terminates the program, returning <TT
>code</TT
> to the
 program's caller.  Before the program terminates, any open or
 semi-closed handles are first closed.
</P
><P
>A program that fails in any other way is treated as if it had
 called <TT
><A HREF="System-Exit.html#v%3AexitFailure"
>exitFailure</A
></TT
>.
 A program that terminates successfully without calling <TT
><A HREF="System-Exit.html#v%3AexitWith"
>exitWith</A
></TT
>
 explicitly is treated as it it had called <TT
><A HREF="System-Exit.html#v%3AexitWith"
>exitWith</A
></TT
> <TT
><A HREF="System-Exit.html#v%3AExitSuccess"
>ExitSuccess</A
></TT
>.
</P
><P
>As an <TT
><A HREF="System-Exit.html#t%3AExitCode"
>ExitCode</A
></TT
> is not an <TT
><A HREF="System-IO-Error.html#t%3AIOError"
>IOError</A
></TT
>, <TT
><A HREF="System-Exit.html#v%3AexitWith"
>exitWith</A
></TT
> bypasses
 the error handling in the <TT
><A HREF="System-IO.html#t%3AIO"
>IO</A
></TT
> monad and cannot be intercepted by
 <TT
><A HREF="System-IO-Error.html#v%3Acatch"
>catch</A
></TT
> from the <A HREF="Prelude.html"
>Prelude</A
>.  However it is a SomeException, and can
 be caught using the functions of <A HREF="Control-Exception.html"
>Control.Exception</A
>.  This means
 that cleanup computations added with Control.Exception.bracket
 (from <A HREF="Control-Exception.html"
>Control.Exception</A
>) are also executed properly on <TT
><A HREF="System-Exit.html#v%3AexitWith"
>exitWith</A
></TT
>.
</P
><P
>Note: in GHC, <TT
><A HREF="System-Exit.html#v%3AexitWith"
>exitWith</A
></TT
> should be called from the main program
 thread in order to exit the process.  When called from another
 thread, <TT
><A HREF="System-Exit.html#v%3AexitWith"
>exitWith</A
></TT
> will throw an ExitException as normal, but the
 exception will not cause the process itself to exit.
</P
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:exitFailure"
><A NAME="v%3AexitFailure"
></A
></A
><B
>exitFailure</B
> ::  <A HREF="System-IO.html#t%3AIO"
>IO</A
> a</TD
></TR
><TR
><TD CLASS="doc"
>The computation <TT
><A HREF="System-Exit.html#v%3AexitFailure"
>exitFailure</A
></TT
> is equivalent to
 <TT
><A HREF="System-Exit.html#v%3AexitWith"
>exitWith</A
></TT
> <TT
>(</TT
><TT
><A HREF="System-Exit.html#v%3AExitFailure"
>ExitFailure</A
></TT
> <EM
>exitfail</EM
><TT
>)</TT
>,
 where <EM
>exitfail</EM
> is implementation-dependent.
</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:exitSuccess"
><A NAME="v%3AexitSuccess"
></A
></A
><B
>exitSuccess</B
> ::  <A HREF="System-IO.html#t%3AIO"
>IO</A
> a</TD
></TR
><TR
><TD CLASS="doc"
>The computation <TT
><A HREF="System-Exit.html#v%3AexitSuccess"
>exitSuccess</A
></TT
> is equivalent to
 <TT
><A HREF="System-Exit.html#v%3AexitWith"
>exitWith</A
></TT
> <TT
><A HREF="System-Exit.html#v%3AExitSuccess"
>ExitSuccess</A
></TT
>, It terminates the program
 sucessfully.
</TD
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></TD
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>Produced by <A HREF="http://www.haskell.org/haddock/"
>Haddock</A
> version 2.6.1</TD
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