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<pre><a name="line-1"></a><span class='hs-comment'>{-# LANGUAGE ExistentialQuantification, NoImplicitPrelude #-}</span>
<a name="line-2"></a>
<a name="line-3"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>System</span><span class='hs-varop'>.</span><span class='hs-conid'>Event</span><span class='hs-varop'>.</span><span class='hs-conid'>Internal</span>
<a name="line-4"></a> <span class='hs-layout'>(</span>
<a name="line-5"></a> <span class='hs-comment'>-- * Event back end</span>
<a name="line-6"></a> <span class='hs-conid'>Backend</span>
<a name="line-7"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>backend</span>
<a name="line-8"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>delete</span>
<a name="line-9"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>poll</span>
<a name="line-10"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>modifyFd</span>
<a name="line-11"></a> <span class='hs-comment'>-- * Event type</span>
<a name="line-12"></a> <span class='hs-layout'>,</span> <span class='hs-conid'>Event</span>
<a name="line-13"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>evtRead</span>
<a name="line-14"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>evtWrite</span>
<a name="line-15"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>evtClose</span>
<a name="line-16"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>eventIs</span>
<a name="line-17"></a> <span class='hs-comment'>-- * Timeout type</span>
<a name="line-18"></a> <span class='hs-layout'>,</span> <span class='hs-conid'>Timeout</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span>
<a name="line-19"></a> <span class='hs-comment'>-- * Helpers</span>
<a name="line-20"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>throwErrnoIfMinus1NoRetry</span>
<a name="line-21"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-22"></a>
<a name="line-23"></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> <span class='hs-layout'>(</span><span class='hs-varop'>.&.</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'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>List</span> <span class='hs-layout'>(</span><span class='hs-varid'>foldl'</span><span class='hs-layout'>,</span> <span class='hs-varid'>intercalate</span><span class='hs-layout'>)</span>
<a name="line-25"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Monoid</span> <span class='hs-layout'>(</span><span class='hs-conid'>Monoid</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-26"></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'>eINTR</span><span class='hs-layout'>,</span> <span class='hs-varid'>getErrno</span><span class='hs-layout'>,</span> <span class='hs-varid'>throwErrno</span><span class='hs-layout'>)</span>
<a name="line-27"></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>
<a name="line-28"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>GHC</span><span class='hs-varop'>.</span><span class='hs-conid'>Base</span>
<a name="line-29"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>GHC</span><span class='hs-varop'>.</span><span class='hs-conid'>Num</span> <span class='hs-layout'>(</span><span class='hs-conid'>Num</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><span class='hs-keyword'>import</span> <span class='hs-conid'>GHC</span><span class='hs-varop'>.</span><span class='hs-conid'>Show</span> <span class='hs-layout'>(</span><span class='hs-conid'>Show</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-31"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>GHC</span><span class='hs-varop'>.</span><span class='hs-conid'>List</span> <span class='hs-layout'>(</span><span class='hs-varid'>filter</span><span class='hs-layout'>,</span> <span class='hs-varid'>null</span><span class='hs-layout'>)</span>
<a name="line-32"></a>
<a name="line-33"></a><a name="Event"></a><span class='hs-comment'>-- | An I\/O event.</span>
<a name="line-34"></a><a name="Event"></a><span class='hs-keyword'>newtype</span> <span class='hs-conid'>Event</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Event</span> <span class='hs-conid'>Int</span>
<a name="line-35"></a> <span class='hs-keyword'>deriving</span> <span class='hs-layout'>(</span><span class='hs-conid'>Eq</span><span class='hs-layout'>)</span>
<a name="line-36"></a>
<a name="line-37"></a><a name="evtNothing"></a><span class='hs-definition'>evtNothing</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Event</span>
<a name="line-38"></a><span class='hs-definition'>evtNothing</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Event</span> <span class='hs-num'>0</span>
<a name="line-39"></a><span class='hs-comment'>{-# INLINE evtNothing #-}</span>
<a name="line-40"></a>
<a name="line-41"></a><a name="evtRead"></a><span class='hs-comment'>-- | Data is available to be read.</span>
<a name="line-42"></a><span class='hs-definition'>evtRead</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Event</span>
<a name="line-43"></a><span class='hs-definition'>evtRead</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Event</span> <span class='hs-num'>1</span>
<a name="line-44"></a><span class='hs-comment'>{-# INLINE evtRead #-}</span>
<a name="line-45"></a>
<a name="line-46"></a><a name="evtWrite"></a><span class='hs-comment'>-- | The file descriptor is ready to accept a write.</span>
<a name="line-47"></a><span class='hs-definition'>evtWrite</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Event</span>
<a name="line-48"></a><span class='hs-definition'>evtWrite</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Event</span> <span class='hs-num'>2</span>
<a name="line-49"></a><span class='hs-comment'>{-# INLINE evtWrite #-}</span>
<a name="line-50"></a>
<a name="line-51"></a><a name="evtClose"></a><span class='hs-comment'>-- | Another thread closed the file descriptor.</span>
<a name="line-52"></a><span class='hs-definition'>evtClose</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Event</span>
<a name="line-53"></a><span class='hs-definition'>evtClose</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Event</span> <span class='hs-num'>4</span>
<a name="line-54"></a><span class='hs-comment'>{-# INLINE evtClose #-}</span>
<a name="line-55"></a>
<a name="line-56"></a><a name="eventIs"></a><span class='hs-definition'>eventIs</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Event</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Event</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span>
<a name="line-57"></a><span class='hs-definition'>eventIs</span> <span class='hs-layout'>(</span><span class='hs-conid'>Event</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>Event</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>a</span> <span class='hs-varop'>.&.</span> <span class='hs-varid'>b</span> <span class='hs-varop'>/=</span> <span class='hs-num'>0</span>
<a name="line-58"></a>
<a name="line-59"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Show</span> <span class='hs-conid'>Event</span> <span class='hs-keyword'>where</span>
<a name="line-60"></a> <span class='hs-varid'>show</span> <span class='hs-varid'>e</span> <span class='hs-keyglyph'>=</span> <span class='hs-chr'>'['</span> <span class='hs-conop'>:</span> <span class='hs-layout'>(</span><span class='hs-varid'>intercalate</span> <span class='hs-str'>","</span> <span class='hs-varop'>.</span> <span class='hs-varid'>filter</span> <span class='hs-layout'>(</span><span class='hs-varid'>not</span> <span class='hs-varop'>.</span> <span class='hs-varid'>null</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span>
<a name="line-61"></a> <span class='hs-keyglyph'>[</span><span class='hs-varid'>evtRead</span> <span class='hs-varop'>`so`</span> <span class='hs-str'>"evtRead"</span><span class='hs-layout'>,</span>
<a name="line-62"></a> <span class='hs-varid'>evtWrite</span> <span class='hs-varop'>`so`</span> <span class='hs-str'>"evtWrite"</span><span class='hs-layout'>,</span>
<a name="line-63"></a> <span class='hs-varid'>evtClose</span> <span class='hs-varop'>`so`</span> <span class='hs-str'>"evtClose"</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span> <span class='hs-varop'>++</span> <span class='hs-str'>"]"</span>
<a name="line-64"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>ev</span> <span class='hs-varop'>`so`</span> <span class='hs-varid'>disp</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>e</span> <span class='hs-varop'>`eventIs`</span> <span class='hs-varid'>ev</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>disp</span>
<a name="line-65"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-str'>""</span>
<a name="line-66"></a>
<a name="line-67"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Monoid</span> <span class='hs-conid'>Event</span> <span class='hs-keyword'>where</span>
<a name="line-68"></a> <span class='hs-varid'>mempty</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>evtNothing</span>
<a name="line-69"></a> <span class='hs-varid'>mappend</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>evtCombine</span>
<a name="line-70"></a> <span class='hs-varid'>mconcat</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>evtConcat</span>
<a name="line-71"></a>
<a name="line-72"></a><a name="evtCombine"></a><span class='hs-definition'>evtCombine</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Event</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Event</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Event</span>
<a name="line-73"></a><span class='hs-definition'>evtCombine</span> <span class='hs-layout'>(</span><span class='hs-conid'>Event</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>Event</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Event</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-varop'>.|.</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span>
<a name="line-74"></a><span class='hs-comment'>{-# INLINE evtCombine #-}</span>
<a name="line-75"></a>
<a name="line-76"></a><a name="evtConcat"></a><span class='hs-definition'>evtConcat</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Event</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Event</span>
<a name="line-77"></a><span class='hs-definition'>evtConcat</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>foldl'</span> <span class='hs-varid'>evtCombine</span> <span class='hs-varid'>evtNothing</span>
<a name="line-78"></a><span class='hs-comment'>{-# INLINE evtConcat #-}</span>
<a name="line-79"></a>
<a name="line-80"></a><a name="Timeout"></a><span class='hs-comment'>-- | A type alias for timeouts, specified in seconds.</span>
<a name="line-81"></a><a name="Timeout"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>Timeout</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Timeout</span> <span class='hs-comment'>{-# UNPACK #-}</span> <span class='hs-varop'>!</span><span class='hs-conid'>Double</span>
<a name="line-82"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>Forever</span>
<a name="line-83"></a> <span class='hs-keyword'>deriving</span> <span class='hs-layout'>(</span><span class='hs-conid'>Show</span><span class='hs-layout'>)</span>
<a name="line-84"></a>
<a name="line-85"></a><a name="Backend"></a><span class='hs-comment'>-- | Event notification backend.</span>
<a name="line-86"></a><a name="Backend"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>Backend</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>forall</span> <span class='hs-varid'>a</span><span class='hs-varop'>.</span> <span class='hs-conid'>Backend</span> <span class='hs-layout'>{</span>
<a name="line-87"></a> <span class='hs-sel'>_beState</span> <span class='hs-keyglyph'>::</span> <span class='hs-varop'>!</span><span class='hs-varid'>a</span>
<a name="line-88"></a>
<a name="line-89"></a> <span class='hs-comment'>-- | Poll backend for new events. The provided callback is called</span>
<a name="line-90"></a> <span class='hs-comment'>-- once per file descriptor with new events.</span>
<a name="line-91"></a> <span class='hs-layout'>,</span> <span class='hs-sel'>_bePoll</span> <span class='hs-keyglyph'>::</span> <span class='hs-varid'>a</span> <span class='hs-comment'>-- backend state</span>
<a name="line-92"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Timeout</span> <span class='hs-comment'>-- timeout in milliseconds</span>
<a name="line-93"></a> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-conid'>Fd</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Event</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span><span class='hs-layout'>)</span> <span class='hs-comment'>-- I/O callback</span>
<a name="line-94"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-95"></a>
<a name="line-96"></a> <span class='hs-comment'>-- | Register, modify, or unregister interest in the given events</span>
<a name="line-97"></a> <span class='hs-comment'>-- on the given file descriptor.</span>
<a name="line-98"></a> <span class='hs-layout'>,</span> <span class='hs-sel'>_beModifyFd</span> <span class='hs-keyglyph'>::</span> <span class='hs-varid'>a</span>
<a name="line-99"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Fd</span> <span class='hs-comment'>-- file descriptor</span>
<a name="line-100"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Event</span> <span class='hs-comment'>-- old events to watch for ('mempty' for new)</span>
<a name="line-101"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Event</span> <span class='hs-comment'>-- new events to watch for ('mempty' to delete)</span>
<a name="line-102"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-103"></a>
<a name="line-104"></a> <span class='hs-layout'>,</span> <span class='hs-sel'>_beDelete</span> <span class='hs-keyglyph'>::</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-105"></a> <span class='hs-layout'>}</span>
<a name="line-106"></a>
<a name="line-107"></a><a name="backend"></a><span class='hs-definition'>backend</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Timeout</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-conid'>Fd</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Event</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span><span class='hs-layout'>)</span>
<a name="line-108"></a> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Fd</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Event</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Event</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span><span class='hs-layout'>)</span>
<a name="line-109"></a> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span><span class='hs-layout'>)</span>
<a name="line-110"></a> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span>
<a name="line-111"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Backend</span>
<a name="line-112"></a><span class='hs-definition'>backend</span> <span class='hs-varid'>bPoll</span> <span class='hs-varid'>bModifyFd</span> <span class='hs-varid'>bDelete</span> <span class='hs-varid'>state</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Backend</span> <span class='hs-varid'>state</span> <span class='hs-varid'>bPoll</span> <span class='hs-varid'>bModifyFd</span> <span class='hs-varid'>bDelete</span>
<a name="line-113"></a><span class='hs-comment'>{-# INLINE backend #-}</span>
<a name="line-114"></a>
<a name="line-115"></a><a name="poll"></a><span class='hs-definition'>poll</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Backend</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Timeout</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-conid'>Fd</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Event</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-116"></a><span class='hs-definition'>poll</span> <span class='hs-layout'>(</span><span class='hs-conid'>Backend</span> <span class='hs-varid'>bState</span> <span class='hs-varid'>bPoll</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>bPoll</span> <span class='hs-varid'>bState</span>
<a name="line-117"></a><span class='hs-comment'>{-# INLINE poll #-}</span>
<a name="line-118"></a>
<a name="line-119"></a><a name="modifyFd"></a><span class='hs-definition'>modifyFd</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Backend</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Fd</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Event</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Event</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-120"></a><span class='hs-definition'>modifyFd</span> <span class='hs-layout'>(</span><span class='hs-conid'>Backend</span> <span class='hs-varid'>bState</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>bModifyFd</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>bModifyFd</span> <span class='hs-varid'>bState</span>
<a name="line-121"></a><span class='hs-comment'>{-# INLINE modifyFd #-}</span>
<a name="line-122"></a>
<a name="line-123"></a><a name="delete"></a><span class='hs-definition'>delete</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Backend</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-124"></a><span class='hs-definition'>delete</span> <span class='hs-layout'>(</span><span class='hs-conid'>Backend</span> <span class='hs-varid'>bState</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>bDelete</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>bDelete</span> <span class='hs-varid'>bState</span>
<a name="line-125"></a><span class='hs-comment'>{-# INLINE delete #-}</span>
<a name="line-126"></a>
<a name="line-127"></a><a name="throwErrnoIfMinus1NoRetry"></a><span class='hs-comment'>-- | Throw an 'IOError' corresponding to the current value of</span>
<a name="line-128"></a><span class='hs-comment'>-- 'getErrno' if the result value of the 'IO' action is -1 and</span>
<a name="line-129"></a><span class='hs-comment'>-- 'getErrno' is not 'eINTR'. If the result value is -1 and</span>
<a name="line-130"></a><span class='hs-comment'>-- 'getErrno' returns 'eINTR' 0 is returned. Otherwise the result</span>
<a name="line-131"></a><span class='hs-comment'>-- value is returned.</span>
<a name="line-132"></a><span class='hs-definition'>throwErrnoIfMinus1NoRetry</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Num</span> <span class='hs-varid'>a</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-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-varid'>a</span>
<a name="line-133"></a><span class='hs-definition'>throwErrnoIfMinus1NoRetry</span> <span class='hs-varid'>loc</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-134"></a> <span class='hs-varid'>res</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>f</span>
<a name="line-135"></a> <span class='hs-keyword'>if</span> <span class='hs-varid'>res</span> <span class='hs-varop'>==</span> <span class='hs-comment'>-</span><span class='hs-num'>1</span>
<a name="line-136"></a> <span class='hs-keyword'>then</span> <span class='hs-keyword'>do</span>
<a name="line-137"></a> <span class='hs-varid'>err</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>getErrno</span>
<a name="line-138"></a> <span class='hs-keyword'>if</span> <span class='hs-varid'>err</span> <span class='hs-varop'>==</span> <span class='hs-varid'>eINTR</span> <span class='hs-keyword'>then</span> <span class='hs-varid'>return</span> <span class='hs-num'>0</span> <span class='hs-keyword'>else</span> <span class='hs-varid'>throwErrno</span> <span class='hs-varid'>loc</span>
<a name="line-139"></a> <span class='hs-keyword'>else</span> <span class='hs-varid'>return</span> <span class='hs-varid'>res</span>
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