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<title>Network/Socket/ByteString/Lazy/Posix.hs</title>
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<pre><a name="line-1"></a><span class='hs-comment'>{-# LANGUAGE BangPatterns #-}</span>
<a name="line-2"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Network</span><span class='hs-varop'>.</span><span class='hs-conid'>Socket</span><span class='hs-varop'>.</span><span class='hs-conid'>ByteString</span><span class='hs-varop'>.</span><span class='hs-conid'>Lazy</span><span class='hs-varop'>.</span><span class='hs-conid'>Posix</span>
<a name="line-3"></a> <span class='hs-layout'>(</span>
<a name="line-4"></a> <span class='hs-comment'>-- * Send data to a socket</span>
<a name="line-5"></a> <span class='hs-varid'>send</span>
<a name="line-6"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>sendAll</span>
<a name="line-7"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-8"></a>
<a name="line-9"></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'>liftM</span><span class='hs-layout'>)</span>
<a name="line-10"></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-11"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>ByteString</span><span class='hs-varop'>.</span><span class='hs-conid'>Lazy</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>L</span>
<a name="line-12"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>ByteString</span><span class='hs-varop'>.</span><span class='hs-conid'>Lazy</span><span class='hs-varop'>.</span><span class='hs-conid'>Internal</span> <span class='hs-layout'>(</span><span class='hs-conid'>ByteString</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-13"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>ByteString</span><span class='hs-varop'>.</span><span class='hs-conid'>Unsafe</span> <span class='hs-layout'>(</span><span class='hs-varid'>unsafeUseAsCStringLen</span><span class='hs-layout'>)</span>
<a name="line-14"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Int</span> <span class='hs-layout'>(</span><span class='hs-conid'>Int64</span><span class='hs-layout'>)</span>
<a name="line-15"></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'>Array</span> <span class='hs-layout'>(</span><span class='hs-varid'>allocaArray</span><span class='hs-layout'>)</span>
<a name="line-16"></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-varid'>plusPtr</span><span class='hs-layout'>)</span>
<a name="line-17"></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-18"></a>
<a name="line-19"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Network</span><span class='hs-varop'>.</span><span class='hs-conid'>Socket</span> <span class='hs-layout'>(</span><span class='hs-conid'>Socket</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-20"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Network</span><span class='hs-varop'>.</span><span class='hs-conid'>Socket</span><span class='hs-varop'>.</span><span class='hs-conid'>ByteString</span><span class='hs-varop'>.</span><span class='hs-conid'>IOVec</span> <span class='hs-layout'>(</span><span class='hs-conid'>IOVec</span><span class='hs-layout'>(</span><span class='hs-conid'>IOVec</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-21"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Network</span><span class='hs-varop'>.</span><span class='hs-conid'>Socket</span><span class='hs-varop'>.</span><span class='hs-conid'>ByteString</span><span class='hs-varop'>.</span><span class='hs-conid'>Internal</span> <span class='hs-layout'>(</span><span class='hs-varid'>c_writev</span><span class='hs-layout'>)</span>
<a name="line-22"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Network</span><span class='hs-varop'>.</span><span class='hs-conid'>Socket</span><span class='hs-varop'>.</span><span class='hs-conid'>Internal</span>
<a name="line-23"></a>
<a name="line-24"></a><span class='hs-comment'>-- -----------------------------------------------------------------------------</span>
<a name="line-25"></a><span class='hs-comment'>-- Sending</span>
<a name="line-26"></a>
<a name="line-27"></a><a name="send"></a><span class='hs-definition'>send</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Socket</span> <span class='hs-comment'>-- ^ Connected socket</span>
<a name="line-28"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ByteString</span> <span class='hs-comment'>-- ^ Data to send</span>
<a name="line-29"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>Int64</span> <span class='hs-comment'>-- ^ Number of bytes sent</span>
<a name="line-30"></a><span class='hs-definition'>send</span> <span class='hs-varid'>sock</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-conid'>MkSocket</span> <span class='hs-varid'>fd</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-31"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>cs</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>take</span> <span class='hs-varid'>maxNumChunks</span> <span class='hs-layout'>(</span><span class='hs-conid'>L</span><span class='hs-varop'>.</span><span class='hs-varid'>toChunks</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span>
<a name="line-32"></a> <span class='hs-varid'>len</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>length</span> <span class='hs-varid'>cs</span>
<a name="line-33"></a> <span class='hs-varid'>liftM</span> <span class='hs-varid'>fromIntegral</span> <span class='hs-varop'>.</span> <span class='hs-varid'>allocaArray</span> <span class='hs-varid'>len</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>ptr</span> <span class='hs-keyglyph'>-></span>
<a name="line-34"></a> <span class='hs-varid'>withPokes</span> <span class='hs-varid'>cs</span> <span class='hs-varid'>ptr</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>niovs</span> <span class='hs-keyglyph'>-></span>
<a name="line-35"></a> <span class='hs-varid'>throwSocketErrorWaitWrite</span> <span class='hs-varid'>sock</span> <span class='hs-str'>"writev"</span> <span class='hs-varop'>$</span>
<a name="line-36"></a> <span class='hs-varid'>c_writev</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>fd</span><span class='hs-layout'>)</span> <span class='hs-varid'>ptr</span> <span class='hs-varid'>niovs</span>
<a name="line-37"></a> <span class='hs-keyword'>where</span>
<a name="line-38"></a> <span class='hs-varid'>withPokes</span> <span class='hs-varid'>ss</span> <span class='hs-varid'>p</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>loop</span> <span class='hs-varid'>ss</span> <span class='hs-varid'>p</span> <span class='hs-num'>0</span> <span class='hs-num'>0</span>
<a name="line-39"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>loop</span> <span class='hs-layout'>(</span><span class='hs-varid'>c</span><span class='hs-conop'>:</span><span class='hs-varid'>cs</span><span class='hs-layout'>)</span> <span class='hs-varid'>q</span> <span class='hs-varid'>k</span> <span class='hs-varop'>!</span><span class='hs-varid'>niovs</span>
<a name="line-40"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>k</span> <span class='hs-varop'><</span> <span class='hs-varid'>maxNumBytes</span> <span class='hs-keyglyph'>=</span>
<a name="line-41"></a> <span class='hs-varid'>unsafeUseAsCStringLen</span> <span class='hs-varid'>c</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-layout'>(</span><span class='hs-varid'>ptr</span><span class='hs-layout'>,</span><span class='hs-varid'>len</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span>
<a name="line-42"></a> <span class='hs-varid'>poke</span> <span class='hs-varid'>q</span> <span class='hs-varop'>$</span> <span class='hs-conid'>IOVec</span> <span class='hs-varid'>ptr</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>len</span><span class='hs-layout'>)</span>
<a name="line-43"></a> <span class='hs-varid'>loop</span> <span class='hs-varid'>cs</span> <span class='hs-layout'>(</span><span class='hs-varid'>q</span> <span class='hs-varop'>`plusPtr`</span> <span class='hs-varid'>sizeOf</span> <span class='hs-layout'>(</span><span class='hs-varid'>undefined</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>IOVec</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-44"></a> <span class='hs-layout'>(</span><span class='hs-varid'>k</span> <span class='hs-varop'>+</span> <span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>len</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>niovs</span> <span class='hs-varop'>+</span> <span class='hs-num'>1</span><span class='hs-layout'>)</span>
<a name="line-45"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>f</span> <span class='hs-varid'>niovs</span>
<a name="line-46"></a> <span class='hs-varid'>loop</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>niovs</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>f</span> <span class='hs-varid'>niovs</span>
<a name="line-47"></a> <span class='hs-varid'>maxNumBytes</span> <span class='hs-keyglyph'>=</span> <span class='hs-num'>4194304</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span> <span class='hs-comment'>-- maximum number of bytes to transmit in one system call</span>
<a name="line-48"></a> <span class='hs-varid'>maxNumChunks</span> <span class='hs-keyglyph'>=</span> <span class='hs-num'>1024</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span> <span class='hs-comment'>-- maximum number of chunks to transmit in one system call</span>
<a name="line-49"></a>
<a name="line-50"></a><a name="sendAll"></a><span class='hs-definition'>sendAll</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Socket</span> <span class='hs-comment'>-- ^ Connected socket</span>
<a name="line-51"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ByteString</span> <span class='hs-comment'>-- ^ Data to send</span>
<a name="line-52"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-53"></a><span class='hs-definition'>sendAll</span> <span class='hs-varid'>sock</span> <span class='hs-varid'>bs</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-54"></a> <span class='hs-varid'>sent</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>send</span> <span class='hs-varid'>sock</span> <span class='hs-varid'>bs</span>
<a name="line-55"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>bs'</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>L</span><span class='hs-varop'>.</span><span class='hs-varid'>drop</span> <span class='hs-varid'>sent</span> <span class='hs-varid'>bs</span>
<a name="line-56"></a> <span class='hs-varid'>unless</span> <span class='hs-layout'>(</span><span class='hs-conid'>L</span><span class='hs-varop'>.</span><span class='hs-varid'>null</span> <span class='hs-varid'>bs'</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span> <span class='hs-varid'>sendAll</span> <span class='hs-varid'>sock</span> <span class='hs-varid'>bs'</span>
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