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<pre><a name="line-1"></a><span class='hs-comment'>{-# LINE 1 "libraries/base/./System/Event/EPoll.hsc" #-}</span>
<a name="line-2"></a><span class='hs-comment'>{-# LANGUAGE ForeignFunctionInterface, GeneralizedNewtypeDeriving,
<a name="line-3"></a>{-# LINE 2 "libraries/base/./System/Event/EPoll.hsc" #-}
<a name="line-4"></a> NoImplicitPrelude #-}</span>
<a name="line-5"></a>
<a name="line-6"></a><span class='hs-comment'>--</span>
<a name="line-7"></a><span class='hs-comment'>-- | A binding to the epoll I/O event notification facility</span>
<a name="line-8"></a><span class='hs-comment'>--</span>
<a name="line-9"></a><span class='hs-comment'>-- epoll is a variant of poll that can be used either as an edge-triggered or</span>
<a name="line-10"></a><span class='hs-comment'>-- a level-triggered interface and scales well to large numbers of watched file</span>
<a name="line-11"></a><span class='hs-comment'>-- descriptors.</span>
<a name="line-12"></a><span class='hs-comment'>--</span>
<a name="line-13"></a><span class='hs-comment'>-- epoll decouples monitor an fd from the process of registering it.</span>
<a name="line-14"></a><span class='hs-comment'>--</span>
<a name="line-15"></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'>EPoll</span>
<a name="line-16"></a> <span class='hs-layout'>(</span>
<a name="line-17"></a> <span class='hs-varid'>new</span>
<a name="line-18"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>available</span>
<a name="line-19"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-20"></a>
<a name="line-21"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</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> <span class='hs-keyword'>as</span> <span class='hs-conid'>E</span>
<a name="line-22"></a>
<a name="line-23"></a>
<a name="line-24"></a><span class='hs-comment'>{-# LINE 22 "libraries/base/./System/Event/EPoll.hsc" #-}</span>
<a name="line-25"></a>
<a name="line-26"></a><span class='hs-comment'>{-# LINE 32 "libraries/base/./System/Event/EPoll.hsc" #-}</span>
<a name="line-27"></a>
<a name="line-28"></a>
<a name="line-29"></a><span class='hs-comment'>{-# LINE 34 "libraries/base/./System/Event/EPoll.hsc" #-}</span>
<a name="line-30"></a>
<a name="line-31"></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'>when</span><span class='hs-layout'>)</span>
<a name="line-32"></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-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-33"></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-34"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Word</span> <span class='hs-layout'>(</span><span class='hs-conid'>Word32</span><span class='hs-layout'>)</span>
<a name="line-35"></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'>throwErrnoIfMinus1</span><span class='hs-layout'>,</span> <span class='hs-varid'>throwErrnoIfMinus1_</span><span class='hs-layout'>)</span>
<a name="line-36"></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-37"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Foreign</span><span class='hs-varop'>.</span><span class='hs-conid'>Marshal</span><span class='hs-varop'>.</span><span class='hs-conid'>Utils</span> <span class='hs-layout'>(</span><span class='hs-varid'>with</span><span class='hs-layout'>)</span>
<a name="line-38"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Foreign</span><span class='hs-varop'>.</span><span class='hs-conid'>Ptr</span> <span class='hs-layout'>(</span><span class='hs-conid'>Ptr</span><span class='hs-layout'>)</span>
<a name="line-39"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Foreign</span><span class='hs-varop'>.</span><span class='hs-conid'>Storable</span> <span class='hs-layout'>(</span><span class='hs-conid'>Storable</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-40"></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-41"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>GHC</span><span class='hs-varop'>.</span><span class='hs-conid'>Err</span> <span class='hs-layout'>(</span><span class='hs-varid'>undefined</span><span class='hs-layout'>)</span>
<a name="line-42"></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-43"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>GHC</span><span class='hs-varop'>.</span><span class='hs-conid'>Real</span> <span class='hs-layout'>(</span><span class='hs-varid'>ceiling</span><span class='hs-layout'>,</span> <span class='hs-varid'>fromIntegral</span><span class='hs-layout'>)</span>
<a name="line-44"></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>
<a name="line-45"></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'>Internals</span> <span class='hs-layout'>(</span><span class='hs-varid'>c_close</span><span class='hs-layout'>)</span>
<a name="line-46"></a>
<a name="line-47"></a><span class='hs-comment'>{-# LINE 53 "libraries/base/./System/Event/EPoll.hsc" #-}</span>
<a name="line-48"></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-49"></a>
<a name="line-50"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</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'>Array</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>A</span>
<a name="line-51"></a><span class='hs-keyword'>import</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> <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><span class='hs-layout'>)</span>
<a name="line-52"></a>
<a name="line-53"></a><a name="available"></a><span class='hs-definition'>available</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Bool</span>
<a name="line-54"></a><span class='hs-definition'>available</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>True</span>
<a name="line-55"></a><span class='hs-comment'>{-# INLINE available #-}</span>
<a name="line-56"></a>
<a name="line-57"></a><a name="EPoll"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>EPoll</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>EPoll</span> <span class='hs-layout'>{</span>
<a name="line-58"></a> <span class='hs-varid'>epollFd</span> <span class='hs-keyglyph'>::</span> <span class='hs-comment'>{-# UNPACK #-}</span> <span class='hs-varop'>!</span><span class='hs-conid'>EPollFd</span>
<a name="line-59"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>epollEvents</span> <span class='hs-keyglyph'>::</span> <span class='hs-comment'>{-# UNPACK #-}</span> <span class='hs-varop'>!</span><span class='hs-layout'>(</span><span class='hs-conid'>A</span><span class='hs-varop'>.</span><span class='hs-conid'>Array</span> <span class='hs-conid'>Event</span><span class='hs-layout'>)</span>
<a name="line-60"></a> <span class='hs-layout'>}</span>
<a name="line-61"></a>
<a name="line-62"></a><a name="new"></a><span class='hs-comment'>-- | Create a new epoll backend.</span>
<a name="line-63"></a><span class='hs-definition'>new</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>IO</span> <span class='hs-conid'>E</span><span class='hs-varop'>.</span><span class='hs-conid'>Backend</span>
<a name="line-64"></a><span class='hs-definition'>new</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-65"></a> <span class='hs-varid'>epfd</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>epollCreate</span>
<a name="line-66"></a> <span class='hs-varid'>evts</span> <span class='hs-keyglyph'><-</span> <span class='hs-conid'>A</span><span class='hs-varop'>.</span><span class='hs-varid'>new</span> <span class='hs-num'>64</span>
<a name="line-67"></a> <span class='hs-keyword'>let</span> <span class='hs-varop'>!</span><span class='hs-varid'>be</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>E</span><span class='hs-varop'>.</span><span class='hs-varid'>backend</span> <span class='hs-varid'>poll</span> <span class='hs-varid'>modifyFd</span> <span class='hs-varid'>delete</span> <span class='hs-layout'>(</span><span class='hs-conid'>EPoll</span> <span class='hs-varid'>epfd</span> <span class='hs-varid'>evts</span><span class='hs-layout'>)</span>
<a name="line-68"></a> <span class='hs-varid'>return</span> <span class='hs-varid'>be</span>
<a name="line-69"></a>
<a name="line-70"></a><a name="delete"></a><span class='hs-definition'>delete</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>EPoll</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-71"></a><span class='hs-definition'>delete</span> <span class='hs-varid'>be</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-72"></a> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>c_close</span> <span class='hs-varop'>.</span> <span class='hs-varid'>fromEPollFd</span> <span class='hs-varop'>.</span> <span class='hs-varid'>epollFd</span> <span class='hs-varop'>$</span> <span class='hs-varid'>be</span>
<a name="line-73"></a> <span class='hs-varid'>return</span> <span class='hs-conid'>()</span>
<a name="line-74"></a>
<a name="line-75"></a><a name="modifyFd"></a><span class='hs-comment'>-- | Change the set of events we are interested in for a given file</span>
<a name="line-76"></a><span class='hs-comment'>-- descriptor.</span>
<a name="line-77"></a><span class='hs-definition'>modifyFd</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>EPoll</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Fd</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>E</span><span class='hs-varop'>.</span><span class='hs-conid'>Event</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>E</span><span class='hs-varop'>.</span><span class='hs-conid'>Event</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-78"></a><span class='hs-definition'>modifyFd</span> <span class='hs-varid'>ep</span> <span class='hs-varid'>fd</span> <span class='hs-varid'>oevt</span> <span class='hs-varid'>nevt</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>with</span> <span class='hs-layout'>(</span><span class='hs-conid'>Event</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromEvent</span> <span class='hs-varid'>nevt</span><span class='hs-layout'>)</span> <span class='hs-varid'>fd</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span>
<a name="line-79"></a> <span class='hs-varid'>epollControl</span> <span class='hs-layout'>(</span><span class='hs-varid'>epollFd</span> <span class='hs-varid'>ep</span><span class='hs-layout'>)</span> <span class='hs-varid'>op</span> <span class='hs-varid'>fd</span>
<a name="line-80"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>op</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>oevt</span> <span class='hs-varop'>==</span> <span class='hs-varid'>mempty</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>controlOpAdd</span>
<a name="line-81"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>nevt</span> <span class='hs-varop'>==</span> <span class='hs-varid'>mempty</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>controlOpDelete</span>
<a name="line-82"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>controlOpModify</span>
<a name="line-83"></a>
<a name="line-84"></a><a name="poll"></a><span class='hs-comment'>-- | Select a set of file descriptors which are ready for I/O</span>
<a name="line-85"></a><span class='hs-comment'>-- operations and call @f@ for all ready file descriptors, passing the</span>
<a name="line-86"></a><span class='hs-comment'>-- events that are ready.</span>
<a name="line-87"></a><span class='hs-definition'>poll</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>EPoll</span> <span class='hs-comment'>-- ^ state</span>
<a name="line-88"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Timeout</span> <span class='hs-comment'>-- ^ timeout in milliseconds</span>
<a name="line-89"></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'>E</span><span class='hs-varop'>.</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-90"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-91"></a><span class='hs-definition'>poll</span> <span class='hs-varid'>ep</span> <span class='hs-varid'>timeout</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-92"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>events</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>epollEvents</span> <span class='hs-varid'>ep</span>
<a name="line-93"></a>
<a name="line-94"></a> <span class='hs-comment'>-- Will return zero if the system call was interupted, in which case</span>
<a name="line-95"></a> <span class='hs-comment'>-- we just return (and try again later.)</span>
<a name="line-96"></a> <span class='hs-varid'>n</span> <span class='hs-keyglyph'><-</span> <span class='hs-conid'>A</span><span class='hs-varop'>.</span><span class='hs-varid'>unsafeLoad</span> <span class='hs-varid'>events</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>es</span> <span class='hs-varid'>cap</span> <span class='hs-keyglyph'>-></span>
<a name="line-97"></a> <span class='hs-varid'>epollWait</span> <span class='hs-layout'>(</span><span class='hs-varid'>epollFd</span> <span class='hs-varid'>ep</span><span class='hs-layout'>)</span> <span class='hs-varid'>es</span> <span class='hs-varid'>cap</span> <span class='hs-varop'>$</span> <span class='hs-varid'>fromTimeout</span> <span class='hs-varid'>timeout</span>
<a name="line-98"></a>
<a name="line-99"></a> <span class='hs-varid'>when</span> <span class='hs-layout'>(</span><span class='hs-varid'>n</span> <span class='hs-varop'>></span> <span class='hs-num'>0</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>do</span>
<a name="line-100"></a> <span class='hs-conid'>A</span><span class='hs-varop'>.</span><span class='hs-varid'>forM_</span> <span class='hs-varid'>events</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>e</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-varid'>eventFd</span> <span class='hs-varid'>e</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>toEvent</span> <span class='hs-layout'>(</span><span class='hs-varid'>eventTypes</span> <span class='hs-varid'>e</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-101"></a> <span class='hs-varid'>cap</span> <span class='hs-keyglyph'><-</span> <span class='hs-conid'>A</span><span class='hs-varop'>.</span><span class='hs-varid'>capacity</span> <span class='hs-varid'>events</span>
<a name="line-102"></a> <span class='hs-varid'>when</span> <span class='hs-layout'>(</span><span class='hs-varid'>cap</span> <span class='hs-varop'>==</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span> <span class='hs-conid'>A</span><span class='hs-varop'>.</span><span class='hs-varid'>ensureCapacity</span> <span class='hs-varid'>events</span> <span class='hs-layout'>(</span><span class='hs-num'>2</span> <span class='hs-varop'>*</span> <span class='hs-varid'>cap</span><span class='hs-layout'>)</span>
<a name="line-103"></a>
<a name="line-104"></a><a name="EPollFd"></a><span class='hs-keyword'>newtype</span> <span class='hs-conid'>EPollFd</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>EPollFd</span> <span class='hs-layout'>{</span>
<a name="line-105"></a> <span class='hs-varid'>fromEPollFd</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>CInt</span>
<a name="line-106"></a> <span class='hs-layout'>}</span> <span class='hs-keyword'>deriving</span> <span class='hs-layout'>(</span><span class='hs-conid'>Eq</span><span class='hs-layout'>,</span> <span class='hs-conid'>Show</span><span class='hs-layout'>)</span>
<a name="line-107"></a>
<a name="line-108"></a><a name="Event"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>Event</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Event</span> <span class='hs-layout'>{</span>
<a name="line-109"></a> <span class='hs-varid'>eventTypes</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>EventType</span>
<a name="line-110"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>eventFd</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Fd</span>
<a name="line-111"></a> <span class='hs-layout'>}</span> <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-112"></a>
<a name="line-113"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Storable</span> <span class='hs-conid'>Event</span> <span class='hs-keyword'>where</span>
<a name="line-114"></a> <span class='hs-varid'>sizeOf</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-num'>12</span><span class='hs-layout'>)</span>
<a name="line-115"></a><span class='hs-comment'>{-# LINE 120 "libraries/base/./System/Event/EPoll.hsc" #-}</span>
<a name="line-116"></a> <span class='hs-varid'>alignment</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>alignment</span> <span class='hs-layout'>(</span><span class='hs-varid'>undefined</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>CInt</span><span class='hs-layout'>)</span>
<a name="line-117"></a>
<a name="line-118"></a> <span class='hs-varid'>peek</span> <span class='hs-varid'>ptr</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-119"></a> <span class='hs-varid'>ets</span> <span class='hs-keyglyph'><-</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>hsc_ptr</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>peekByteOff</span> <span class='hs-varid'>hsc_ptr</span> <span class='hs-num'>0</span><span class='hs-layout'>)</span> <span class='hs-varid'>ptr</span>
<a name="line-120"></a><span class='hs-comment'>{-# LINE 124 "libraries/base/./System/Event/EPoll.hsc" #-}</span>
<a name="line-121"></a> <span class='hs-varid'>ed</span> <span class='hs-keyglyph'><-</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>hsc_ptr</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>peekByteOff</span> <span class='hs-varid'>hsc_ptr</span> <span class='hs-num'>4</span><span class='hs-layout'>)</span> <span class='hs-varid'>ptr</span>
<a name="line-122"></a><span class='hs-comment'>{-# LINE 125 "libraries/base/./System/Event/EPoll.hsc" #-}</span>
<a name="line-123"></a> <span class='hs-keyword'>let</span> <span class='hs-varop'>!</span><span class='hs-varid'>ev</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Event</span> <span class='hs-layout'>(</span><span class='hs-conid'>EventType</span> <span class='hs-varid'>ets</span><span class='hs-layout'>)</span> <span class='hs-varid'>ed</span>
<a name="line-124"></a> <span class='hs-varid'>return</span> <span class='hs-varid'>ev</span>
<a name="line-125"></a>
<a name="line-126"></a> <span class='hs-varid'>poke</span> <span class='hs-varid'>ptr</span> <span class='hs-varid'>e</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-127"></a> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>hsc_ptr</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>pokeByteOff</span> <span class='hs-varid'>hsc_ptr</span> <span class='hs-num'>0</span><span class='hs-layout'>)</span> <span class='hs-varid'>ptr</span> <span class='hs-layout'>(</span><span class='hs-varid'>unEventType</span> <span class='hs-varop'>$</span> <span class='hs-varid'>eventTypes</span> <span class='hs-varid'>e</span><span class='hs-layout'>)</span>
<a name="line-128"></a><span class='hs-comment'>{-# LINE 130 "libraries/base/./System/Event/EPoll.hsc" #-}</span>
<a name="line-129"></a> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>hsc_ptr</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>pokeByteOff</span> <span class='hs-varid'>hsc_ptr</span> <span class='hs-num'>4</span><span class='hs-layout'>)</span> <span class='hs-varid'>ptr</span> <span class='hs-layout'>(</span><span class='hs-varid'>eventFd</span> <span class='hs-varid'>e</span><span class='hs-layout'>)</span>
<a name="line-130"></a><span class='hs-comment'>{-# LINE 131 "libraries/base/./System/Event/EPoll.hsc" #-}</span>
<a name="line-131"></a>
<a name="line-132"></a><a name="ControlOp"></a><span class='hs-keyword'>newtype</span> <span class='hs-conid'>ControlOp</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ControlOp</span> <span class='hs-conid'>CInt</span>
<a name="line-133"></a>
<a name="line-134"></a><a name="controlOpAdd"></a><span class='hs-definition'>controlOpAdd</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>ControlOp</span>
<a name="line-135"></a><span class='hs-definition'>controlOpAdd</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ControlOp</span> <span class='hs-num'>1</span>
<a name="line-136"></a><a name="controlOpModify"></a><span class='hs-definition'>controlOpModify</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>ControlOp</span>
<a name="line-137"></a><span class='hs-definition'>controlOpModify</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ControlOp</span> <span class='hs-num'>3</span>
<a name="line-138"></a><a name="controlOpDelete"></a><span class='hs-definition'>controlOpDelete</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>ControlOp</span>
<a name="line-139"></a><span class='hs-definition'>controlOpDelete</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ControlOp</span> <span class='hs-num'>2</span>
<a name="line-140"></a>
<a name="line-141"></a><span class='hs-comment'>{-# LINE 139 "libraries/base/./System/Event/EPoll.hsc" #-}</span>
<a name="line-142"></a>
<a name="line-143"></a><a name="EventType"></a><span class='hs-keyword'>newtype</span> <span class='hs-conid'>EventType</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>EventType</span> <span class='hs-layout'>{</span>
<a name="line-144"></a> <span class='hs-varid'>unEventType</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Word32</span>
<a name="line-145"></a> <span class='hs-layout'>}</span> <span class='hs-keyword'>deriving</span> <span class='hs-layout'>(</span><span class='hs-conid'>Show</span><span class='hs-layout'>,</span> <span class='hs-conid'>Eq</span><span class='hs-layout'>,</span> <span class='hs-conid'>Num</span><span class='hs-layout'>,</span> <span class='hs-conid'>Bits</span><span class='hs-layout'>)</span>
<a name="line-146"></a>
<a name="line-147"></a><a name="epollIn"></a><span class='hs-definition'>epollIn</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>EventType</span>
<a name="line-148"></a><span class='hs-definition'>epollIn</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>EventType</span> <span class='hs-num'>1</span>
<a name="line-149"></a><a name="epollOut"></a><span class='hs-definition'>epollOut</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>EventType</span>
<a name="line-150"></a><span class='hs-definition'>epollOut</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>EventType</span> <span class='hs-num'>4</span>
<a name="line-151"></a><a name="epollErr"></a><span class='hs-definition'>epollErr</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>EventType</span>
<a name="line-152"></a><span class='hs-definition'>epollErr</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>EventType</span> <span class='hs-num'>8</span>
<a name="line-153"></a><a name="epollHup"></a><span class='hs-definition'>epollHup</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>EventType</span>
<a name="line-154"></a><span class='hs-definition'>epollHup</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>EventType</span> <span class='hs-num'>16</span>
<a name="line-155"></a>
<a name="line-156"></a><span class='hs-comment'>{-# LINE 150 "libraries/base/./System/Event/EPoll.hsc" #-}</span>
<a name="line-157"></a>
<a name="line-158"></a><a name="epollCreate"></a><span class='hs-comment'>-- | Create a new epoll context, returning a file descriptor associated with the context.</span>
<a name="line-159"></a><span class='hs-comment'>-- The fd may be used for subsequent calls to this epoll context.</span>
<a name="line-160"></a><span class='hs-comment'>--</span>
<a name="line-161"></a><span class='hs-comment'>-- The size parameter to epoll_create is a hint about the expected number of handles.</span>
<a name="line-162"></a><span class='hs-comment'>--</span>
<a name="line-163"></a><span class='hs-comment'>-- The file descriptor returned from epoll_create() should be destroyed via</span>
<a name="line-164"></a><span class='hs-comment'>-- a call to close() after polling is finished</span>
<a name="line-165"></a><span class='hs-comment'>--</span>
<a name="line-166"></a><span class='hs-definition'>epollCreate</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>IO</span> <span class='hs-conid'>EPollFd</span>
<a name="line-167"></a><span class='hs-definition'>epollCreate</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-168"></a> <span class='hs-varid'>fd</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>throwErrnoIfMinus1</span> <span class='hs-str'>"epollCreate"</span> <span class='hs-varop'>$</span>
<a name="line-169"></a>
<a name="line-170"></a><span class='hs-comment'>{-# LINE 163 "libraries/base/./System/Event/EPoll.hsc" #-}</span>
<a name="line-171"></a> <span class='hs-varid'>c_epoll_create1</span> <span class='hs-layout'>(</span><span class='hs-num'>524288</span><span class='hs-layout'>)</span>
<a name="line-172"></a><span class='hs-comment'>{-# LINE 164 "libraries/base/./System/Event/EPoll.hsc" #-}</span>
<a name="line-173"></a>
<a name="line-174"></a><span class='hs-comment'>{-# LINE 168 "libraries/base/./System/Event/EPoll.hsc" #-}</span>
<a name="line-175"></a> <span class='hs-keyword'>let</span> <span class='hs-varop'>!</span><span class='hs-varid'>epollFd'</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>EPollFd</span> <span class='hs-varid'>fd</span>
<a name="line-176"></a> <span class='hs-varid'>return</span> <span class='hs-varid'>epollFd'</span>
<a name="line-177"></a>
<a name="line-178"></a><a name="epollControl"></a><span class='hs-definition'>epollControl</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>EPollFd</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ControlOp</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Fd</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Ptr</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-179"></a><span class='hs-definition'>epollControl</span> <span class='hs-layout'>(</span><span class='hs-conid'>EPollFd</span> <span class='hs-varid'>epfd</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>ControlOp</span> <span class='hs-varid'>op</span><span class='hs-layout'>)</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'>event</span> <span class='hs-keyglyph'>=</span>
<a name="line-180"></a> <span class='hs-varid'>throwErrnoIfMinus1_</span> <span class='hs-str'>"epollControl"</span> <span class='hs-varop'>$</span> <span class='hs-varid'>c_epoll_ctl</span> <span class='hs-varid'>epfd</span> <span class='hs-varid'>op</span> <span class='hs-varid'>fd</span> <span class='hs-varid'>event</span>
<a name="line-181"></a>
<a name="line-182"></a><a name="epollWait"></a><span class='hs-definition'>epollWait</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>EPollFd</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Ptr</span> <span class='hs-conid'>Event</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>Int</span>
<a name="line-183"></a><span class='hs-definition'>epollWait</span> <span class='hs-layout'>(</span><span class='hs-conid'>EPollFd</span> <span class='hs-varid'>epfd</span><span class='hs-layout'>)</span> <span class='hs-varid'>events</span> <span class='hs-varid'>numEvents</span> <span class='hs-varid'>timeout</span> <span class='hs-keyglyph'>=</span>
<a name="line-184"></a> <span class='hs-varid'>fmap</span> <span class='hs-varid'>fromIntegral</span> <span class='hs-varop'>.</span>
<a name="line-185"></a> <span class='hs-conid'>E</span><span class='hs-varop'>.</span><span class='hs-varid'>throwErrnoIfMinus1NoRetry</span> <span class='hs-str'>"epollWait"</span> <span class='hs-varop'>$</span>
<a name="line-186"></a> <span class='hs-varid'>c_epoll_wait</span> <span class='hs-varid'>epfd</span> <span class='hs-varid'>events</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>numEvents</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>timeout</span><span class='hs-layout'>)</span>
<a name="line-187"></a>
<a name="line-188"></a><a name="fromEvent"></a><span class='hs-definition'>fromEvent</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>E</span><span class='hs-varop'>.</span><span class='hs-conid'>Event</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>EventType</span>
<a name="line-189"></a><span class='hs-definition'>fromEvent</span> <span class='hs-varid'>e</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>remap</span> <span class='hs-conid'>E</span><span class='hs-varop'>.</span><span class='hs-varid'>evtRead</span> <span class='hs-varid'>epollIn</span> <span class='hs-varop'>.|.</span>
<a name="line-190"></a> <span class='hs-varid'>remap</span> <span class='hs-conid'>E</span><span class='hs-varop'>.</span><span class='hs-varid'>evtWrite</span> <span class='hs-varid'>epollOut</span>
<a name="line-191"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>remap</span> <span class='hs-varid'>evt</span> <span class='hs-varid'>to</span>
<a name="line-192"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>e</span> <span class='hs-varop'>`</span><span class='hs-conid'>E</span><span class='hs-varop'>.</span><span class='hs-varid'>eventIs</span><span class='hs-varop'>`</span> <span class='hs-varid'>evt</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>to</span>
<a name="line-193"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-num'>0</span>
<a name="line-194"></a>
<a name="line-195"></a><a name="toEvent"></a><span class='hs-definition'>toEvent</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>EventType</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>E</span><span class='hs-varop'>.</span><span class='hs-conid'>Event</span>
<a name="line-196"></a><span class='hs-definition'>toEvent</span> <span class='hs-varid'>e</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>remap</span> <span class='hs-layout'>(</span><span class='hs-varid'>epollIn</span> <span class='hs-varop'>.|.</span> <span class='hs-varid'>epollErr</span> <span class='hs-varop'>.|.</span> <span class='hs-varid'>epollHup</span><span class='hs-layout'>)</span> <span class='hs-conid'>E</span><span class='hs-varop'>.</span><span class='hs-varid'>evtRead</span> <span class='hs-varop'>`mappend`</span>
<a name="line-197"></a> <span class='hs-varid'>remap</span> <span class='hs-layout'>(</span><span class='hs-varid'>epollOut</span> <span class='hs-varop'>.|.</span> <span class='hs-varid'>epollErr</span> <span class='hs-varop'>.|.</span> <span class='hs-varid'>epollHup</span><span class='hs-layout'>)</span> <span class='hs-conid'>E</span><span class='hs-varop'>.</span><span class='hs-varid'>evtWrite</span>
<a name="line-198"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>remap</span> <span class='hs-varid'>evt</span> <span class='hs-varid'>to</span>
<a name="line-199"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>e</span> <span class='hs-varop'>.&.</span> <span class='hs-varid'>evt</span> <span class='hs-varop'>/=</span> <span class='hs-num'>0</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>to</span>
<a name="line-200"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>mempty</span>
<a name="line-201"></a>
<a name="line-202"></a><a name="fromTimeout"></a><span class='hs-definition'>fromTimeout</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Timeout</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span>
<a name="line-203"></a><span class='hs-definition'>fromTimeout</span> <span class='hs-conid'>Forever</span> <span class='hs-keyglyph'>=</span> <span class='hs-comment'>-</span><span class='hs-num'>1</span>
<a name="line-204"></a><span class='hs-definition'>fromTimeout</span> <span class='hs-layout'>(</span><span class='hs-conid'>Timeout</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>ceiling</span> <span class='hs-varop'>$</span> <span class='hs-num'>1000</span> <span class='hs-varop'>*</span> <span class='hs-varid'>s</span>
<a name="line-205"></a>
<a name="line-206"></a>
<a name="line-207"></a><span class='hs-comment'>{-# LINE 200 "libraries/base/./System/Event/EPoll.hsc" #-}</span>
<a name="line-208"></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'>"sys/epoll.h epoll_create1"</span>
<a name="line-209"></a> <span class='hs-varid'>c_epoll_create1</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-210"></a>
<a name="line-211"></a><span class='hs-comment'>{-# LINE 206 "libraries/base/./System/Event/EPoll.hsc" #-}</span>
<a name="line-212"></a>
<a name="line-213"></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'>"sys/epoll.h epoll_ctl"</span>
<a name="line-214"></a> <span class='hs-varid'>c_epoll_ctl</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>CInt</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>CInt</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>CInt</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Ptr</span> <span class='hs-conid'>Event</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>CInt</span>
<a name="line-215"></a>
<a name="line-216"></a><span class='hs-keyword'>foreign</span> <span class='hs-keyword'>import</span> <span class='hs-keyword'>ccall</span> <span class='hs-keyword'>safe</span> <span class='hs-str'>"sys/epoll.h epoll_wait"</span>
<a name="line-217"></a> <span class='hs-varid'>c_epoll_wait</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>CInt</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Ptr</span> <span class='hs-conid'>Event</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>CInt</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-218"></a>
<a name="line-219"></a>
<a name="line-220"></a><span class='hs-comment'>{-# LINE 214 "libraries/base/./System/Event/EPoll.hsc" #-}</span>
</pre></body>
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