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<title>System/IO/Posix/MMap/Internal.hs</title>
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<pre><a name="line-1"></a><span class='hs-comment'>{-# LANGUAGE ForeignFunctionInterface #-}</span>
<a name="line-2"></a><span class='hs-comment'>--------------------------------------------------------------------</span>
<a name="line-3"></a><span class='hs-comment'>-- |</span>
<a name="line-4"></a><span class='hs-comment'>-- Module : System.IO.Posix.MMap.Internal</span>
<a name="line-5"></a><span class='hs-comment'>-- Copyright : (c) Galois, Inc. 2007</span>
<a name="line-6"></a><span class='hs-comment'>-- License : BSD3</span>
<a name="line-7"></a><span class='hs-comment'>--</span>
<a name="line-8"></a><span class='hs-comment'>-- Maintainer: Don Stewart <dons@galois.com></span>
<a name="line-9"></a><span class='hs-comment'>-- Stability : provisional</span>
<a name="line-10"></a><span class='hs-comment'>-- Portability: non-portable -- posix only</span>
<a name="line-11"></a><span class='hs-comment'>--</span>
<a name="line-12"></a><span class='hs-comment'>-- Low level mmap access.</span>
<a name="line-13"></a><span class='hs-comment'>--</span>
<a name="line-14"></a><span class='hs-keyword'>module</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'>Posix</span><span class='hs-varop'>.</span><span class='hs-conid'>MMap</span><span class='hs-varop'>.</span><span class='hs-conid'>Internal</span> <span class='hs-layout'>(</span>
<a name="line-15"></a>
<a name="line-16"></a> <span class='hs-comment'>-- * Converting an mmapped pointer to a 'ByteString'</span>
<a name="line-17"></a> <span class='hs-varid'>unsafePackMMapPtr</span><span class='hs-layout'>,</span> <span class='hs-comment'>-- :: Ptr Word8 -> CSize -> IO ByteString</span>
<a name="line-18"></a>
<a name="line-19"></a> <span class='hs-comment'>-- * Low level bindings</span>
<a name="line-20"></a> <span class='hs-varid'>c_mmap</span><span class='hs-layout'>,</span> <span class='hs-comment'>-- :: CSize -> CInt -> IO (Ptr Word8)</span>
<a name="line-21"></a> <span class='hs-varid'>c_munmap</span> <span class='hs-comment'>-- :: Ptr Word8 -> CSize -> IO CInt</span>
<a name="line-22"></a>
<a name="line-23"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-24"></a>
<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'>IO</span>
<a name="line-26"></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'>IO</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>IO</span>
<a name="line-27"></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>
<a name="line-28"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Foreign</span><span class='hs-varop'>.</span><span class='hs-conid'>Ptr</span>
<a name="line-29"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</span> <span class='hs-conid'>Foreign</span><span class='hs-varop'>.</span><span class='hs-conid'>Concurrent</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>FC</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>
<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'>Word</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'>ByteString</span><span class='hs-varop'>.</span><span class='hs-conid'>Internal</span>
<a name="line-34"></a><span class='hs-comment'>-- import Data.ByteString</span>
<a name="line-35"></a>
<a name="line-36"></a><a name="unsafePackMMapPtr"></a><span class='hs-comment'>-- | Create a bytestring from a memory mapped Ptr.</span>
<a name="line-37"></a><span class='hs-comment'>-- A finalizer will be associated with the resource, that will call</span>
<a name="line-38"></a><span class='hs-comment'>-- munmap when the storage manager detects that the resource is no longer</span>
<a name="line-39"></a><span class='hs-comment'>-- in use.</span>
<a name="line-40"></a><span class='hs-definition'>unsafePackMMapPtr</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Ptr</span> <span class='hs-conid'>Word8</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>CSize</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>ByteString</span>
<a name="line-41"></a><span class='hs-definition'>unsafePackMMapPtr</span> <span class='hs-varid'>p</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-42"></a> <span class='hs-varid'>fp</span> <span class='hs-keyglyph'><-</span> <span class='hs-conid'>FC</span><span class='hs-varop'>.</span><span class='hs-varid'>newForeignPtr</span> <span class='hs-varid'>p</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>do</span>
<a name="line-43"></a> <span class='hs-varid'>v</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>c_munmap</span> <span class='hs-varid'>p</span> <span class='hs-varid'>s</span>
<a name="line-44"></a> <span class='hs-varid'>when</span> <span class='hs-layout'>(</span><span class='hs-varid'>v</span> <span class='hs-varop'>==</span> <span class='hs-comment'>-</span><span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span> <span class='hs-conid'>IO</span><span class='hs-varop'>.</span><span class='hs-varid'>hPutStrLn</span> <span class='hs-varid'>stderr</span> <span class='hs-varop'>$</span>
<a name="line-45"></a> <span class='hs-str'>"System.IO.Posix.MMap: warning, failed to unmap "</span>
<a name="line-46"></a> <span class='hs-varop'>++</span> <span class='hs-varid'>show</span> <span class='hs-varid'>s</span> <span class='hs-varop'>++</span><span class='hs-str'>" bytes at "</span><span class='hs-varop'>++</span><span class='hs-varid'>show</span> <span class='hs-varid'>p</span>
<a name="line-47"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromForeignPtr</span> <span class='hs-varid'>fp</span> <span class='hs-num'>0</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-48"></a><span class='hs-comment'>{-# INLINE unsafePackMMapPtr #-}</span>
<a name="line-49"></a>
<a name="line-50"></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'>"hs_bytestring_mmap.h hs_bytestring_mmap"</span>
<a name="line-51"></a> <span class='hs-varid'>c_mmap</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>CSize</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-layout'>(</span><span class='hs-conid'>Ptr</span> <span class='hs-conid'>Word8</span><span class='hs-layout'>)</span>
<a name="line-52"></a>
<a name="line-53"></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'>"hs_bytestring_mmap.h munmap"</span>
<a name="line-54"></a> <span class='hs-varid'>c_munmap</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Ptr</span> <span class='hs-conid'>Word8</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>CSize</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>CInt</span>
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