<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html>
<head>
<!-- Generated by HsColour, http://code.haskell.org/~malcolm/hscolour/ -->
<title>src/Darcs/Compat.hs</title>
<link type='text/css' rel='stylesheet' href='hscolour.css' />
</head>
<body>
<pre><a name="line-1"></a><span class='hs-comment'>{-# LANGUAGE CPP, ForeignFunctionInterface #-}</span>
<a name="line-2"></a>
<a name="line-3"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Darcs</span><span class='hs-varop'>.</span><span class='hs-conid'>Compat</span> <span class='hs-layout'>(</span><span class='hs-varid'>stdoutIsAPipe</span><span class='hs-layout'>,</span> <span class='hs-varid'>mkStdoutTemp</span><span class='hs-layout'>,</span> <span class='hs-varid'>canonFilename</span><span class='hs-layout'>,</span>
<a name="line-4"></a> <span class='hs-varid'>maybeRelink</span><span class='hs-layout'>,</span> <span class='hs-varid'>atomicCreate</span><span class='hs-layout'>,</span> <span class='hs-varid'>sloppyAtomicCreate</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-5"></a>
<a name="line-6"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Prelude</span> <span class='hs-varid'>hiding</span> <span class='hs-layout'>(</span> <span class='hs-varid'>catch</span> <span class='hs-layout'>)</span>
<a name="line-7"></a>
<a name="line-8"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Darcs</span><span class='hs-varop'>.</span><span class='hs-conid'>Utils</span> <span class='hs-layout'>(</span> <span class='hs-varid'>withCurrentDirectory</span> <span class='hs-layout'>)</span>
<a name="line-9"></a><span class='hs-cpp'>#ifdef WIN32</span>
<a name="line-10"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Darcs</span><span class='hs-varop'>.</span><span class='hs-conid'>Utils</span> <span class='hs-layout'>(</span> <span class='hs-varid'>showHexLen</span> <span class='hs-layout'>)</span>
<a name="line-11"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Bits</span> <span class='hs-layout'>(</span> <span class='hs-layout'>(</span><span class='hs-varop'>.&.</span><span class='hs-layout'>)</span> <span class='hs-layout'>)</span>
<a name="line-12"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>System</span><span class='hs-varop'>.</span><span class='hs-conid'>Random</span> <span class='hs-layout'>(</span> <span class='hs-varid'>randomIO</span> <span class='hs-layout'>)</span>
<a name="line-13"></a><span class='hs-cpp'>#else</span>
<a name="line-14"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Foreign</span><span class='hs-varop'>.</span><span class='hs-conid'>C</span><span class='hs-varop'>.</span><span class='hs-conid'>String</span> <span class='hs-layout'>(</span> <span class='hs-varid'>peekCString</span> <span class='hs-layout'>)</span>
<a name="line-15"></a><span class='hs-cpp'>#endif</span>
<a name="line-16"></a>
<a name="line-17"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span> <span class='hs-layout'>(</span> <span class='hs-varid'>unless</span> <span class='hs-layout'>)</span>
<a name="line-18"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Foreign</span><span class='hs-varop'>.</span><span class='hs-conid'>C</span><span class='hs-varop'>.</span><span class='hs-conid'>Types</span> <span class='hs-layout'>(</span> <span class='hs-conid'>CInt</span> <span class='hs-layout'>)</span>
<a name="line-19"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Foreign</span><span class='hs-varop'>.</span><span class='hs-conid'>C</span><span class='hs-varop'>.</span><span class='hs-conid'>String</span> <span class='hs-layout'>(</span> <span class='hs-conid'>CString</span><span class='hs-layout'>,</span> <span class='hs-varid'>withCString</span> <span class='hs-layout'>)</span>
<a name="line-20"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Foreign</span><span class='hs-varop'>.</span><span class='hs-conid'>C</span><span class='hs-varop'>.</span><span class='hs-conid'>Error</span> <span class='hs-layout'>(</span> <span class='hs-varid'>throwErrno</span><span class='hs-layout'>,</span> <span class='hs-varid'>eEXIST</span><span class='hs-layout'>,</span> <span class='hs-varid'>getErrno</span> <span class='hs-layout'>)</span>
<a name="line-21"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>System</span><span class='hs-varop'>.</span><span class='hs-conid'>Directory</span> <span class='hs-layout'>(</span> <span class='hs-varid'>getCurrentDirectory</span> <span class='hs-layout'>)</span>
<a name="line-22"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>System</span><span class='hs-varop'>.</span><span class='hs-conid'>IO</span> <span class='hs-layout'>(</span> <span class='hs-varid'>hFlush</span><span class='hs-layout'>,</span> <span class='hs-varid'>stdout</span><span class='hs-layout'>,</span> <span class='hs-varid'>stderr</span><span class='hs-layout'>,</span> <span class='hs-varid'>hSetBuffering</span><span class='hs-layout'>,</span>
<a name="line-23"></a> <span class='hs-conid'>BufferMode</span><span class='hs-layout'>(</span><span class='hs-conid'>NoBuffering</span><span class='hs-layout'>)</span> <span class='hs-layout'>)</span>
<a name="line-24"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>System</span><span class='hs-varop'>.</span><span class='hs-conid'>IO</span><span class='hs-varop'>.</span><span class='hs-conid'>Error</span> <span class='hs-layout'>(</span> <span class='hs-varid'>mkIOError</span><span class='hs-layout'>,</span> <span class='hs-varid'>alreadyExistsErrorType</span> <span class='hs-layout'>)</span>
<a name="line-25"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>System</span><span class='hs-varop'>.</span><span class='hs-conid'>Posix</span><span class='hs-varop'>.</span><span class='hs-conid'>Files</span> <span class='hs-layout'>(</span> <span class='hs-varid'>stdFileMode</span> <span class='hs-layout'>)</span>
<a name="line-26"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>System</span><span class='hs-varop'>.</span><span class='hs-conid'>Posix</span><span class='hs-varop'>.</span><span class='hs-conid'>IO</span> <span class='hs-layout'>(</span> <span class='hs-varid'>openFd</span><span class='hs-layout'>,</span> <span class='hs-varid'>closeFd</span><span class='hs-layout'>,</span> <span class='hs-varid'>stdOutput</span><span class='hs-layout'>,</span> <span class='hs-varid'>stdError</span><span class='hs-layout'>,</span>
<a name="line-27"></a> <span class='hs-varid'>dupTo</span><span class='hs-layout'>,</span> <span class='hs-varid'>defaultFileFlags</span><span class='hs-layout'>,</span> <span class='hs-varid'>exclusive</span><span class='hs-layout'>,</span>
<a name="line-28"></a> <span class='hs-conid'>OpenMode</span><span class='hs-layout'>(</span><span class='hs-conid'>WriteOnly</span><span class='hs-layout'>)</span> <span class='hs-layout'>)</span>
<a name="line-29"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>System</span><span class='hs-varop'>.</span><span class='hs-conid'>Posix</span><span class='hs-varop'>.</span><span class='hs-conid'>Types</span> <span class='hs-layout'>(</span> <span class='hs-conid'>Fd</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span> <span class='hs-layout'>)</span>
<a name="line-30"></a>
<a name="line-31"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Darcs</span><span class='hs-varop'>.</span><span class='hs-conid'>SignalHandler</span> <span class='hs-layout'>(</span> <span class='hs-varid'>stdoutIsAPipe</span> <span class='hs-layout'>)</span>
<a name="line-32"></a>
<a name="line-33"></a><a name="canonFilename"></a><span class='hs-definition'>canonFilename</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>FilePath</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>FilePath</span>
<a name="line-34"></a><span class='hs-definition'>canonFilename</span> <span class='hs-varid'>f</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-keyword'>_</span><span class='hs-conop'>:</span><span class='hs-chr'>':'</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>return</span> <span class='hs-varid'>f</span> <span class='hs-comment'>-- absolute windows paths</span>
<a name="line-35"></a><span class='hs-definition'>canonFilename</span> <span class='hs-varid'>f</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-chr'>'/'</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>return</span> <span class='hs-varid'>f</span>
<a name="line-36"></a><span class='hs-definition'>canonFilename</span> <span class='hs-layout'>(</span><span class='hs-chr'>'.'</span><span class='hs-conop'>:</span><span class='hs-chr'>'/'</span><span class='hs-conop'>:</span><span class='hs-varid'>f</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>cd</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>getCurrentDirectory</span>
<a name="line-37"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-varid'>cd</span> <span class='hs-varop'>++</span> <span class='hs-str'>"/"</span> <span class='hs-varop'>++</span> <span class='hs-varid'>f</span>
<a name="line-38"></a><span class='hs-definition'>canonFilename</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>reverse</span> <span class='hs-varop'>$</span> <span class='hs-varid'>dropWhile</span> <span class='hs-layout'>(</span><span class='hs-varop'>/=</span><span class='hs-chr'>'/'</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span> <span class='hs-varid'>reverse</span> <span class='hs-varid'>f</span> <span class='hs-keyword'>of</span>
<a name="line-39"></a> <span class='hs-str'>""</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>fmap</span> <span class='hs-layout'>(</span><span class='hs-varop'>++</span><span class='hs-layout'>(</span><span class='hs-chr'>'/'</span><span class='hs-conop'>:</span><span class='hs-varid'>f</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-varid'>getCurrentDirectory</span>
<a name="line-40"></a> <span class='hs-varid'>rd</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>withCurrentDirectory</span> <span class='hs-varid'>rd</span> <span class='hs-varop'>$</span>
<a name="line-41"></a> <span class='hs-keyword'>do</span> <span class='hs-varid'>fd</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>getCurrentDirectory</span>
<a name="line-42"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-varid'>fd</span> <span class='hs-varop'>++</span> <span class='hs-str'>"/"</span> <span class='hs-varop'>++</span> <span class='hs-varid'>simplefilename</span>
<a name="line-43"></a> <span class='hs-keyword'>where</span>
<a name="line-44"></a> <span class='hs-varid'>simplefilename</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>reverse</span> <span class='hs-varop'>$</span> <span class='hs-varid'>takeWhile</span> <span class='hs-layout'>(</span><span class='hs-varop'>/=</span><span class='hs-chr'>'/'</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span> <span class='hs-varid'>reverse</span> <span class='hs-varid'>f</span>
<a name="line-45"></a>
<a name="line-46"></a><span class='hs-cpp'>#ifdef WIN32</span>
<a name="line-47"></a><a name="mkstempCore"></a><span class='hs-definition'>mkstempCore</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>FilePath</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-layout'>(</span><span class='hs-conid'>Fd</span><span class='hs-layout'>,</span> <span class='hs-conid'>String</span><span class='hs-layout'>)</span>
<a name="line-48"></a><span class='hs-definition'>mkstempCore</span> <span class='hs-varid'>fp</span>
<a name="line-49"></a> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>r</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>randomIO</span>
<a name="line-50"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>fp'</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fp</span> <span class='hs-varop'>++</span> <span class='hs-layout'>(</span><span class='hs-varid'>showHexLen</span> <span class='hs-num'>6</span> <span class='hs-layout'>(</span><span class='hs-varid'>r</span> <span class='hs-varop'>.&.</span> <span class='hs-num'>0xFFFFFF</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-51"></a> <span class='hs-varid'>fd</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>openFd</span> <span class='hs-varid'>fp'</span> <span class='hs-conid'>WriteOnly</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-varid'>stdFileMode</span><span class='hs-layout'>)</span> <span class='hs-varid'>flags</span>
<a name="line-52"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>fd</span><span class='hs-layout'>,</span> <span class='hs-varid'>fp'</span><span class='hs-layout'>)</span>
<a name="line-53"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>flags</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>defaultFileFlags</span> <span class='hs-layout'>{</span> <span class='hs-varid'>exclusive</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>True</span> <span class='hs-layout'>}</span>
<a name="line-54"></a><span class='hs-cpp'>#else</span>
<a name="line-55"></a><span class='hs-definition'>mkstempCore</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-layout'>(</span><span class='hs-conid'>Fd</span><span class='hs-layout'>,</span> <span class='hs-conid'>String</span><span class='hs-layout'>)</span>
<a name="line-56"></a><span class='hs-definition'>mkstempCore</span> <span class='hs-varid'>str</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>withCString</span> <span class='hs-layout'>(</span><span class='hs-varid'>str</span><span class='hs-varop'>++</span><span class='hs-str'>"XXXXXX"</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span>
<a name="line-57"></a> <span class='hs-keyglyph'>\</span><span class='hs-varid'>cstr</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span> <span class='hs-varid'>fd</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>c_mkstemp</span> <span class='hs-varid'>cstr</span>
<a name="line-58"></a> <span class='hs-keyword'>if</span> <span class='hs-varid'>fd</span> <span class='hs-varop'><</span> <span class='hs-num'>0</span>
<a name="line-59"></a> <span class='hs-keyword'>then</span> <span class='hs-varid'>throwErrno</span> <span class='hs-varop'>$</span> <span class='hs-str'>"Failed to create temporary file "</span><span class='hs-varop'>++</span><span class='hs-varid'>str</span>
<a name="line-60"></a> <span class='hs-keyword'>else</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>str'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>peekCString</span> <span class='hs-varid'>cstr</span>
<a name="line-61"></a> <span class='hs-varid'>fname</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>canonFilename</span> <span class='hs-varid'>str'</span>
<a name="line-62"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-conid'>Fd</span> <span class='hs-varid'>fd</span><span class='hs-layout'>,</span> <span class='hs-varid'>fname</span><span class='hs-layout'>)</span>
<a name="line-63"></a>
<a name="line-64"></a><span class='hs-keyword'>foreign</span> <span class='hs-keyword'>import</span> <span class='hs-keyword'>ccall</span> <span class='hs-keyword'>unsafe</span> <span class='hs-str'>"static stdlib.h mkstemp"</span>
<a name="line-65"></a> <span class='hs-varid'>c_mkstemp</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>CString</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>CInt</span>
<a name="line-66"></a><span class='hs-cpp'>#endif</span>
<a name="line-67"></a>
<a name="line-68"></a><a name="mkStdoutTemp"></a><span class='hs-definition'>mkStdoutTemp</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>String</span>
<a name="line-69"></a><span class='hs-definition'>mkStdoutTemp</span> <span class='hs-varid'>str</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-layout'>(</span><span class='hs-varid'>fd</span><span class='hs-layout'>,</span> <span class='hs-varid'>fn</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>mkstempCore</span> <span class='hs-varid'>str</span>
<a name="line-70"></a> <span class='hs-varid'>hFlush</span> <span class='hs-varid'>stdout</span>
<a name="line-71"></a> <span class='hs-varid'>hFlush</span> <span class='hs-varid'>stderr</span>
<a name="line-72"></a><span class='hs-comment'>-- Warning: A do-notation statement discarded a result of type Fd.</span>
<a name="line-73"></a> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>dupTo</span> <span class='hs-varid'>fd</span> <span class='hs-varid'>stdOutput</span>
<a name="line-74"></a><span class='hs-comment'>-- Warning: A do-notation statement discarded a result of type Fd.</span>
<a name="line-75"></a> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>dupTo</span> <span class='hs-varid'>fd</span> <span class='hs-varid'>stdError</span>
<a name="line-76"></a> <span class='hs-varid'>hFlush</span> <span class='hs-varid'>stdout</span>
<a name="line-77"></a> <span class='hs-varid'>hFlush</span> <span class='hs-varid'>stderr</span>
<a name="line-78"></a> <span class='hs-varid'>hSetBuffering</span> <span class='hs-varid'>stdout</span> <span class='hs-conid'>NoBuffering</span>
<a name="line-79"></a> <span class='hs-varid'>hSetBuffering</span> <span class='hs-varid'>stderr</span> <span class='hs-conid'>NoBuffering</span>
<a name="line-80"></a> <span class='hs-varid'>return</span> <span class='hs-varid'>fn</span>
<a name="line-81"></a>
<a name="line-82"></a>
<a name="line-83"></a>
<a name="line-84"></a><span class='hs-keyword'>foreign</span> <span class='hs-keyword'>import</span> <span class='hs-keyword'>ccall</span> <span class='hs-keyword'>unsafe</span> <span class='hs-str'>"maybe_relink.h maybe_relink"</span> <span class='hs-varid'>maybe_relink</span>
<a name="line-85"></a> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>CString</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>CString</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>CInt</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>CInt</span>
<a name="line-86"></a>
<a name="line-87"></a><a name="maybeRelink"></a><span class='hs-comment'>-- Checks whether src and dst are identical. If so, makes dst into a</span>
<a name="line-88"></a><span class='hs-comment'>-- link to src. Returns True if dst is a link to src (either because</span>
<a name="line-89"></a><span class='hs-comment'>-- we linked it or it already was). Safe against changes to src if</span>
<a name="line-90"></a><span class='hs-comment'>-- they are not in place, but not to dst.</span>
<a name="line-91"></a><span class='hs-definition'>maybeRelink</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>Bool</span>
<a name="line-92"></a><span class='hs-definition'>maybeRelink</span> <span class='hs-varid'>src</span> <span class='hs-varid'>dst</span> <span class='hs-keyglyph'>=</span>
<a name="line-93"></a> <span class='hs-varid'>withCString</span> <span class='hs-varid'>src</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>csrc</span> <span class='hs-keyglyph'>-></span>
<a name="line-94"></a> <span class='hs-varid'>withCString</span> <span class='hs-varid'>dst</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>cdst</span> <span class='hs-keyglyph'>-></span>
<a name="line-95"></a> <span class='hs-keyword'>do</span> <span class='hs-varid'>rc</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>maybe_relink</span> <span class='hs-varid'>csrc</span> <span class='hs-varid'>cdst</span> <span class='hs-num'>1</span>
<a name="line-96"></a> <span class='hs-layout'>(</span><span class='hs-keyword'>case</span> <span class='hs-varid'>rc</span> <span class='hs-keyword'>of</span>
<a name="line-97"></a> <span class='hs-num'>0</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-conid'>True</span>
<a name="line-98"></a> <span class='hs-num'>1</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-conid'>True</span>
<a name="line-99"></a> <span class='hs-comment'>-</span><span class='hs-num'>1</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>throwErrno</span> <span class='hs-layout'>(</span><span class='hs-str'>"Relinking "</span> <span class='hs-varop'>++</span> <span class='hs-varid'>dst</span><span class='hs-layout'>)</span>
<a name="line-100"></a> <span class='hs-comment'>-</span><span class='hs-num'>2</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-conid'>False</span>
<a name="line-101"></a> <span class='hs-comment'>-</span><span class='hs-num'>3</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span> <span class='hs-varid'>putStrLn</span> <span class='hs-layout'>(</span><span class='hs-str'>"Relinking: race condition avoided on file "</span> <span class='hs-varop'>++</span>
<a name="line-102"></a> <span class='hs-varid'>dst</span><span class='hs-layout'>)</span>
<a name="line-103"></a> <span class='hs-varid'>return</span> <span class='hs-conid'>False</span>
<a name="line-104"></a> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>fail</span> <span class='hs-layout'>(</span><span class='hs-str'>"Unexpected situation when relinking "</span> <span class='hs-varop'>++</span> <span class='hs-varid'>dst</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-105"></a>
<a name="line-106"></a><a name="sloppyAtomicCreate"></a><span class='hs-definition'>sloppyAtomicCreate</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>FilePath</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-107"></a><span class='hs-definition'>sloppyAtomicCreate</span> <span class='hs-varid'>fp</span>
<a name="line-108"></a> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>fd</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>openFd</span> <span class='hs-varid'>fp</span> <span class='hs-conid'>WriteOnly</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-varid'>stdFileMode</span><span class='hs-layout'>)</span> <span class='hs-varid'>flags</span>
<a name="line-109"></a> <span class='hs-varid'>closeFd</span> <span class='hs-varid'>fd</span>
<a name="line-110"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>flags</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>defaultFileFlags</span> <span class='hs-layout'>{</span> <span class='hs-varid'>exclusive</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>True</span> <span class='hs-layout'>}</span>
<a name="line-111"></a>
<a name="line-112"></a><a name="atomicCreate"></a><span class='hs-definition'>atomicCreate</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>FilePath</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-113"></a><span class='hs-definition'>atomicCreate</span> <span class='hs-varid'>fp</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>withCString</span> <span class='hs-varid'>fp</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>cstr</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span>
<a name="line-114"></a> <span class='hs-varid'>rc</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>c_atomic_create</span> <span class='hs-varid'>cstr</span>
<a name="line-115"></a> <span class='hs-varid'>unless</span> <span class='hs-layout'>(</span><span class='hs-varid'>rc</span> <span class='hs-varop'>>=</span> <span class='hs-num'>0</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span>
<a name="line-116"></a> <span class='hs-keyword'>do</span> <span class='hs-varid'>errno</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>getErrno</span>
<a name="line-117"></a> <span class='hs-varid'>pwd</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>getCurrentDirectory</span>
<a name="line-118"></a> <span class='hs-keyword'>if</span> <span class='hs-varid'>errno</span> <span class='hs-varop'>==</span> <span class='hs-varid'>eEXIST</span>
<a name="line-119"></a> <span class='hs-keyword'>then</span> <span class='hs-varid'>ioError</span> <span class='hs-varop'>$</span> <span class='hs-varid'>mkIOError</span> <span class='hs-varid'>alreadyExistsErrorType</span>
<a name="line-120"></a> <span class='hs-layout'>(</span><span class='hs-str'>"atomicCreate in "</span><span class='hs-varop'>++</span><span class='hs-varid'>pwd</span><span class='hs-layout'>)</span>
<a name="line-121"></a> <span class='hs-conid'>Nothing</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-varid'>fp</span><span class='hs-layout'>)</span>
<a name="line-122"></a> <span class='hs-keyword'>else</span> <span class='hs-varid'>throwErrno</span> <span class='hs-varop'>$</span> <span class='hs-str'>"atomicCreate "</span><span class='hs-varop'>++</span><span class='hs-varid'>fp</span><span class='hs-varop'>++</span><span class='hs-str'>" in "</span><span class='hs-varop'>++</span><span class='hs-varid'>pwd</span>
<a name="line-123"></a>
<a name="line-124"></a><span class='hs-keyword'>foreign</span> <span class='hs-keyword'>import</span> <span class='hs-keyword'>ccall</span> <span class='hs-keyword'>unsafe</span> <span class='hs-str'>"atomic_create.h atomic_create"</span> <span class='hs-varid'>c_atomic_create</span>
<a name="line-125"></a> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>CString</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>CInt</span>
</pre></body>
</html>
