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<!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>HPath.IO.Errors</title><link href="ocean.css" rel="stylesheet" type="text/css" title="Ocean" /><script src="haddock-util.js" type="text/javascript"></script><script src="https://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML" 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="src/HPath-IO-Errors.html">Source</a></li><li><a href="index.html">Contents</a></li><li><a href="doc-index.html">Index</a></li></ul><p class="caption">hpath-0.7.5: Support for well-typed paths</p></div><div id="content"><div id="module-header"><table class="info"><tr><th>Copyright</th><td>&#169; 2016 Julian Ospald</td></tr><tr><th>License</th><td>BSD3</td></tr><tr><th>Maintainer</th><td>Julian Ospald &lt;hasufell@posteo.de&gt;</td></tr><tr><th>Stability</th><td>experimental</td></tr><tr><th>Portability</th><td>portable</td></tr><tr><th>Safe Haskell</th><td>Safe</td></tr><tr><th>Language</th><td>Haskell2010</td></tr></table><p class="caption">HPath.IO.Errors</p></div><div id="table-of-contents"><p class="caption">Contents</p><ul><li><a href="#g:1">Types</a></li><li><a href="#g:2">Exception identifiers</a></li><li><a href="#g:3">Path based functions</a></li><li><a href="#g:4">Error handling functions</a></li></ul></div><div id="description"><p class="caption">Description</p><div class="doc"><p>Provides error handling.</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:HPathIOException">HPathIOException</a><ul class="subs"><li>= <a href="#v:FileDoesNotExist">FileDoesNotExist</a> <a href="https://hackage.haskell.org/package/bytestring-0.10.8.1/docs/Data-ByteString.html#t:ByteString">ByteString</a></li><li>| <a href="#v:DirDoesNotExist">DirDoesNotExist</a> <a href="https://hackage.haskell.org/package/bytestring-0.10.8.1/docs/Data-ByteString.html#t:ByteString">ByteString</a></li><li>| <a href="#v:SameFile">SameFile</a> <a href="https://hackage.haskell.org/package/bytestring-0.10.8.1/docs/Data-ByteString.html#t:ByteString">ByteString</a> <a href="https://hackage.haskell.org/package/bytestring-0.10.8.1/docs/Data-ByteString.html#t:ByteString">ByteString</a></li><li>| <a href="#v:DestinationInSource">DestinationInSource</a> <a href="https://hackage.haskell.org/package/bytestring-0.10.8.1/docs/Data-ByteString.html#t:ByteString">ByteString</a> <a href="https://hackage.haskell.org/package/bytestring-0.10.8.1/docs/Data-ByteString.html#t:ByteString">ByteString</a></li><li>| <a href="#v:FileDoesExist">FileDoesExist</a> <a href="https://hackage.haskell.org/package/bytestring-0.10.8.1/docs/Data-ByteString.html#t:ByteString">ByteString</a></li><li>| <a href="#v:DirDoesExist">DirDoesExist</a> <a href="https://hackage.haskell.org/package/bytestring-0.10.8.1/docs/Data-ByteString.html#t:ByteString">ByteString</a></li><li>| <a href="#v:InvalidOperation">InvalidOperation</a> <a href="https://hackage.haskell.org/package/base-4.9.0.0/docs/Data-String.html#t:String">String</a></li><li>| <a href="#v:Can-39-tOpenDirectory">Can'tOpenDirectory</a> <a href="https://hackage.haskell.org/package/bytestring-0.10.8.1/docs/Data-ByteString.html#t:ByteString">ByteString</a></li><li>| <a href="#v:CopyFailed">CopyFailed</a> <a href="https://hackage.haskell.org/package/base-4.9.0.0/docs/Data-String.html#t:String">String</a></li><li>| <a href="#v:RecursiveFailure">RecursiveFailure</a> [<a href="https://hackage.haskell.org/package/base-4.9.0.0/docs/Control-Exception-Base.html#t:IOException">IOException</a>]</li></ul></li><li class="src short"><a href="#v:isFileDoesNotExist">isFileDoesNotExist</a> :: <a href="HPath-IO-Errors.html#t:HPathIOException">HPathIOException</a> -&gt; <a href="https://hackage.haskell.org/package/base-4.9.0.0/docs/Data-Bool.html#t:Bool">Bool</a></li><li class="src short"><a href="#v:isDirDoesNotExist">isDirDoesNotExist</a> :: <a href="HPath-IO-Errors.html#t:HPathIOException">HPathIOException</a> -&gt; <a href="https://hackage.haskell.org/package/base-4.9.0.0/docs/Data-Bool.html#t:Bool">Bool</a></li><li class="src short"><a href="#v:isSameFile">isSameFile</a> :: <a href="HPath-IO-Errors.html#t:HPathIOException">HPathIOException</a> -&gt; <a href="https:
This follows symbolic links.</p></div></div><div class="top"><p class="src"><a id="v:throwDestinationInSource" class="def">throwDestinationInSource</a> <a href="src/HPath-IO-Errors.html#throwDestinationInSource" class="link">Source</a> <a href="#v:throwDestinationInSource" class="selflink">#</a></p><div class="subs arguments"><p class="caption">Arguments</p><table><tr><td class="src">:: <a href="HPath.html#t:Path">Path</a> <a href="HPath.html#t:Abs">Abs</a></td><td class="doc"><p>source dir</p></td></tr><tr><td class="src">-&gt; <a href="HPath.html#t:Path">Path</a> <a href="HPath.html#t:Abs">Abs</a></td><td class="doc"><p>full destination, <code>dirname dest</code>
must exist</p></td></tr><tr><td class="src">-&gt; <a href="https://hackage.haskell.org/package/base-4.9.0.0/docs/System-IO.html#t:IO">IO</a> ()</td><td class="doc empty">&nbsp;</td></tr></table></div><div class="doc"><p>Checks whether the destination directory is contained
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within the source directory by comparing the device+file ID of the
source directory with all device+file IDs of the parent directories
of the destination.</p></div></div><div class="top"><p class="src"><a id="v:doesFileExist" class="def">doesFileExist</a> :: <a href="HPath.html#t:Path">Path</a> <a href="HPath.html#t:Abs">Abs</a> -&gt; <a href="https://hackage.haskell.org/package/base-4.9.0.0/docs/System-IO.html#t:IO">IO</a> <a href="https://hackage.haskell.org/package/base-4.9.0.0/docs/Data-Bool.html#t:Bool">Bool</a> <a href="src/HPath-IO-Errors.html#doesFileExist" class="link">Source</a> <a href="#v:doesFileExist" class="selflink">#</a></p><div class="doc"><p>Checks if the given file exists and is not a directory.
Does not follow symlinks.</p></div></div><div class="top"><p class="src"><a id="v:doesDirectoryExist" class="def">doesDirectoryExist</a> :: <a href="HPath.html#t:Path">Path</a> <a href="HPath.html#t:Abs">Abs</a> -&gt; <a href="https://hackage.haskell.org/package/base-4.9.0.0/docs/System-IO.html#t:IO">IO</a> <a href="https://hackage.haskell.org/package/base-4.9.0.0/docs/Data-Bool.html#t:Bool">Bool</a> <a href="src/HPath-IO-Errors.html#doesDirectoryExist" class="link">Source</a> <a href="#v:doesDirectoryExist" class="selflink">#</a></p><div class="doc"><p>Checks if the given file exists and is a directory.
Does not follow symlinks.</p></div></div><div class="top"><p class="src"><a id="v:isWritable" class="def">isWritable</a> :: <a href="HPath.html#t:Path">Path</a> <a href="HPath.html#t:Abs">Abs</a> -&gt; <a href="https://hackage.haskell.org/package/base-4.9.0.0/docs/System-IO.html#t:IO">IO</a> <a href="https://hackage.haskell.org/package/base-4.9.0.0/docs/Data-Bool.html#t:Bool">Bool</a> <a href="src/HPath-IO-Errors.html#isWritable" class="link">Source</a> <a href="#v:isWritable" class="selflink">#</a></p><div class="doc"><p>Checks whether a file or folder is writable.</p></div></div><div class="top"><p class="src"><a id="v:canOpenDirectory" class="def">canOpenDirectory</a> :: <a href="HPath.html#t:Path">Path</a> <a href="HPath.html#t:Abs">Abs</a> -&gt; <a href="https://hackage.haskell.org/package/base-4.9.0.0/docs/System-IO.html#t:IO">IO</a> <a href="https://hackage.haskell.org/package/base-4.9.0.0/docs/Data-Bool.html#t:Bool">Bool</a> <a href="src/HPath-IO-Errors.html#canOpenDirectory" class="link">Source</a> <a href="#v:canOpenDirectory" class="selflink">#</a></p><div class="doc"><p>Checks whether the directory at the given path exists and can be
opened. This invokes <code>openDirStream</code> which follows symlinks.</p></div></div><div class="top"><p class="src"><a id="v:throwCantOpenDirectory" class="def">throwCantOpenDirectory</a> :: <a href="HPath.html#t:Path">Path</a> <a href="HPath.html#t:Abs">Abs</a> -&gt; <a href="https://hackage.haskell.org/package/base-4.9.0.0/docs/System-IO.html#t:IO">IO</a> () <a href="src/HPath-IO-Errors.html#throwCantOpenDirectory" class="link">Source</a> <a href="#v:throwCantOpenDirectory" class="selflink">#</a></p><div class="doc"><p>Throws a <code><a href="HPath-IO-Errors.html#v:Can-39-tOpenDirectory">Can'tOpenDirectory</a></code> HPathIOException if the directory at the given
path cannot be opened.</p></div></div><h1 id="g:4">Error handling functions</h1><div class="top"><p class="src"><a id="v:catchErrno" class="def">catchErrno</a> <a href="src/HPath-IO-Errors.html#catchErrno" class="link">Source</a> <a href="#v:catchErrno" class="selflink">#</a></p><div class="subs arguments"><p class="caption">Arguments</p><table><tr><td class="src">:: [<a href="https://hackage.haskell.org/package/base-4.9.0.0/docs/Foreign-C-Error.html#t:Errno">Errno</a>]</td><td class="doc"><p>errno to catch</p></td></tr><tr><td class="src">-&gt; <a href="https://hackage.haskell.org/package/base-4.9.0.0/docs/System-IO.html#t:IO">IO</a> a</td><td class="doc"><p>action to try, which can raise an IOException</p></td></tr><tr><td class="src">-&gt; <a href="https://hackage.haskell.org/package/base-4.9.0.0/docs/System-IO.html#t:IO">IO</a> a</td><td class="doc"><p>action to carry out in case of an IOException and
if errno matches</p></td></tr><tr><td class="src">-&gt; <a href="https://hackage.haskell.org/package/base-4.9.0.0/docs/System-IO.html#t:IO">IO</a> a</td><td class="doc empty">&nbsp;</td></tr></table></div><div class="doc"><p>Carries out an action, then checks if there is an IOException and
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a specific errno. If so, then it carries out another action, otherwise
it rethrows the error.</p></div></div><div class="top"><p class="src"><a id="v:rethrowErrnoAs" class="def">rethrowErrnoAs</a> <a href="src/HPath-IO-Errors.html#rethrowErrnoAs" class="link">Source</a> <a href="#v:rethrowErrnoAs" class="selflink">#</a></p><div class="subs arguments"><p class="caption">Arguments</p><table><tr><td class="src">:: <a href="https://hackage.haskell.org/package/base-4.9.0.0/docs/Control-Exception-Base.html#t:Exception">Exception</a> e</td><td class="doc empty">&nbsp;</td></tr><tr><td class="src">=&gt; [<a href="https://hackage.haskell.org/package/base-4.9.0.0/docs/Foreign-C-Error.html#t:Errno">Errno</a>]</td><td class="doc"><p>errno to catch</p></td></tr><tr><td class="src">-&gt; e</td><td class="doc"><p>rethrow as if errno matches</p></td></tr><tr><td class="src">-&gt; <a href="https://hackage.haskell.org/package/base-4.9.0.0/docs/System-IO.html#t:IO">IO</a> a</td><td class="doc"><p>action to try</p></td></tr><tr><td class="src">-&gt; <a href="https://hackage.haskell.org/package/base-4.9.0.0/docs/System-IO.html#t:IO">IO</a> a</td><td class="doc empty">&nbsp;</td></tr></table></div><div class="doc"><p>Execute the given action and retrow IO exceptions as a new Exception
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that have the given errno. If errno does not match the exception is rethrown
as is.</p></div></div><div class="top"><p class="src"><a id="v:handleIOError" class="def">handleIOError</a> :: (<a href="https://hackage.haskell.org/package/base-4.9.0.0/docs/System-IO-Error.html#t:IOError">IOError</a> -&gt; <a href="https://hackage.haskell.org/package/base-4.9.0.0/docs/System-IO.html#t:IO">IO</a> a) -&gt; <a href="https://hackage.haskell.org/package/base-4.9.0.0/docs/System-IO.html#t:IO">IO</a> a -&gt; <a href="https://hackage.haskell.org/package/base-4.9.0.0/docs/System-IO.html#t:IO">IO</a> a <a href="src/HPath-IO-Errors.html#handleIOError" class="link">Source</a> <a href="#v:handleIOError" class="selflink">#</a></p><div class="doc"><p>Like <code><a href="https://hackage.haskell.org/package/base-4.9.0.0/docs/System-IO-Error.html#v:catchIOError">catchIOError</a></code>, with arguments swapped.</p></div></div><div class="top"><p class="src"><a id="v:bracketeer" class="def">bracketeer</a> <a href="src/HPath-IO-Errors.html#bracketeer" class="link">Source</a> <a href="#v:bracketeer" class="selflink">#</a></p><div class="subs arguments"><p class="caption">Arguments</p><table><tr><td class="src">:: <a href="https://hackage.haskell.org/package/base-4.9.0.0/docs/System-IO.html#t:IO">IO</a> a</td><td class="doc"><p>computation to run first</p></td></tr><tr><td class="src">-&gt; (a -&gt; <a href="https://hackage.haskell.org/package/base-4.9.0.0/docs/System-IO.html#t:IO">IO</a> b)</td><td class="doc"><p>computation to run last, when
no exception was raised</p></td></tr><tr><td class="src">-&gt; (a -&gt; <a href="https://hackage.haskell.org/package/base-4.9.0.0/docs/System-IO.html#t:IO">IO</a> b)</td><td class="doc"><p>computation to run last,
when an exception was raised</p></td></tr><tr><td class="src">-&gt; (a -&gt; <a href="https://hackage.haskell.org/package/base-4.9.0.0/docs/System-IO.html#t:IO">IO</a> c)</td><td class="doc"><p>computation to run in-between</p></td></tr><tr><td class="src">-&gt; <a href="https://hackage.haskell.org/package/base-4.9.0.0/docs/System-IO.html#t:IO">IO</a> c</td><td class="doc empty">&nbsp;</td></tr></table></div><div class="doc"><p>Like <code><a href="https://hackage.haskell.org/package/base-4.9.0.0/docs/Control-Exception-Base.html#v:bracket">bracket</a></code>, but allows to have different clean-up
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actions depending on whether the in-between computation
has raised an exception or not. </p></div></div><div class="top"><p class="src"><a id="v:reactOnError" class="def">reactOnError</a> <a href="src/HPath-IO-Errors.html#reactOnError" class="link">Source</a> <a href="#v:reactOnError" class="selflink">#</a></p><div class="subs arguments"><p class="caption">Arguments</p><table><tr><td class="src">:: <a href="https://hackage.haskell.org/package/base-4.9.0.0/docs/System-IO.html#t:IO">IO</a> a</td><td class="doc empty">&nbsp;</td></tr><tr><td class="src">-&gt; [(<a href="https://hackage.haskell.org/package/base-4.9.0.0/docs/System-IO-Error.html#t:IOErrorType">IOErrorType</a>, <a href="https://hackage.haskell.org/package/base-4.9.0.0/docs/System-IO.html#t:IO">IO</a> a)]</td><td class="doc"><p>reaction on IO errors</p></td></tr><tr><td class="src">-&gt; [(<a href="HPath-IO-Errors.html#t:HPathIOException">HPathIOException</a>, <a href="https://hackage.haskell.org/package/base-4.9.0.0/docs/System-IO.html#t:IO">IO</a> a)]</td><td class="doc"><p>reaction on HPathIOException</p></td></tr><tr><td class="src">-&gt; <a href="https://hackage.haskell.org/package/base-4.9.0.0/docs/System-IO.html#t:IO">IO</a> a</td><td class="doc empty">&nbsp;</td></tr></table></div></div></div></div><div id="footer"><p>Produced by <a href="http://www.haskell.org/haddock/">Haddock</a> version 2.17.2</p></div></body></html>