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<pre><a name="line-1"></a><span class='hs-comment'>{-# LANGUAGE CPP #-}</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 : Network</span>
<a name="line-5"></a><span class='hs-comment'>-- Copyright : (c) The University of Glasgow 2001</span>
<a name="line-6"></a><span class='hs-comment'>-- License : BSD-style (see the file libraries/network/LICENSE)</span>
<a name="line-7"></a><span class='hs-comment'>--</span>
<a name="line-8"></a><span class='hs-comment'>-- Maintainer : libraries@haskell.org</span>
<a name="line-9"></a><span class='hs-comment'>-- Stability : provisional</span>
<a name="line-10"></a><span class='hs-comment'>-- Portability : portable</span>
<a name="line-11"></a><span class='hs-comment'>--</span>
<a name="line-12"></a><span class='hs-comment'>-- This module is kept for backwards-compatibility. New users are</span>
<a name="line-13"></a><span class='hs-comment'>-- encouraged to use "Network.Socket" instead.</span>
<a name="line-14"></a><span class='hs-comment'>--</span>
<a name="line-15"></a><span class='hs-comment'>-- "Network" was intended as a \"higher-level\" interface to networking</span>
<a name="line-16"></a><span class='hs-comment'>-- facilities, and only supports TCP.</span>
<a name="line-17"></a><span class='hs-comment'>--</span>
<a name="line-18"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span>
<a name="line-19"></a>
<a name="line-20"></a><span class='hs-cpp'>#include "HsNetworkConfig.h"</span>
<a name="line-21"></a>
<a name="line-22"></a><span class='hs-cpp'>#ifdef HAVE_GETADDRINFO</span>
<a name="line-23"></a><span class='hs-comment'>-- Use IPv6-capable function definitions if the OS supports it.</span>
<a name="line-24"></a><span class='hs-cpp'>#define IPV6_SOCKET_SUPPORT 1</span>
<a name="line-25"></a><span class='hs-cpp'>#endif</span>
<a name="line-26"></a>
<a name="line-27"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Network</span>
<a name="line-28"></a> <span class='hs-layout'>(</span>
<a name="line-29"></a> <span class='hs-comment'>-- * Basic data types</span>
<a name="line-30"></a> <span class='hs-conid'>Socket</span>
<a name="line-31"></a> <span class='hs-layout'>,</span> <span class='hs-conid'>PortID</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span>
<a name="line-32"></a> <span class='hs-layout'>,</span> <span class='hs-conid'>HostName</span>
<a name="line-33"></a> <span class='hs-layout'>,</span> <span class='hs-conid'>PortNumber</span>
<a name="line-34"></a>
<a name="line-35"></a> <span class='hs-comment'>-- * Initialisation</span>
<a name="line-36"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>withSocketsDo</span>
<a name="line-37"></a>
<a name="line-38"></a> <span class='hs-comment'>-- * Server-side connections</span>
<a name="line-39"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>listenOn</span>
<a name="line-40"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>accept</span>
<a name="line-41"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>sClose</span>
<a name="line-42"></a>
<a name="line-43"></a> <span class='hs-comment'>-- * Client-side connections</span>
<a name="line-44"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>connectTo</span>
<a name="line-45"></a>
<a name="line-46"></a> <span class='hs-comment'>-- * Simple sending and receiving</span>
<a name="line-47"></a> <span class='hs-comment'>{-$sendrecv-}</span>
<a name="line-48"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>sendTo</span>
<a name="line-49"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>recvFrom</span>
<a name="line-50"></a>
<a name="line-51"></a> <span class='hs-comment'>-- * Miscellaneous</span>
<a name="line-52"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>socketPort</span>
<a name="line-53"></a>
<a name="line-54"></a> <span class='hs-comment'>-- * Networking Issues</span>
<a name="line-55"></a> <span class='hs-comment'>-- ** Buffering</span>
<a name="line-56"></a> <span class='hs-comment'>{-$buffering-}</span>
<a name="line-57"></a>
<a name="line-58"></a> <span class='hs-comment'>-- ** Improving I\/O Performance over sockets</span>
<a name="line-59"></a> <span class='hs-comment'>{-$performance-}</span>
<a name="line-60"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-61"></a>
<a name="line-62"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Exception</span> <span class='hs-layout'>(</span><span class='hs-varid'>throwIO</span><span class='hs-layout'>)</span>
<a name="line-63"></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-64"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Maybe</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromJust</span><span class='hs-layout'>)</span>
<a name="line-65"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Network</span><span class='hs-varop'>.</span><span class='hs-conid'>BSD</span>
<a name="line-66"></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-varid'>hiding</span> <span class='hs-layout'>(</span><span class='hs-varid'>accept</span><span class='hs-layout'>,</span> <span class='hs-varid'>socketPort</span><span class='hs-layout'>,</span> <span class='hs-varid'>recvFrom</span><span class='hs-layout'>,</span>
<a name="line-67"></a> <span class='hs-varid'>sendTo</span><span class='hs-layout'>,</span> <span class='hs-conid'>PortNumber</span><span class='hs-layout'>,</span> <span class='hs-varid'>sClose</span><span class='hs-layout'>)</span>
<a name="line-68"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</span> <span class='hs-conid'>Network</span><span class='hs-varop'>.</span><span class='hs-conid'>Socket</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>Socket</span> <span class='hs-layout'>(</span><span class='hs-varid'>accept</span><span class='hs-layout'>)</span>
<a name="line-69"></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-70"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Prelude</span>
<a name="line-71"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Exception</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>Exception</span>
<a name="line-72"></a>
<a name="line-73"></a><span class='hs-comment'>-- ---------------------------------------------------------------------------</span>
<a name="line-74"></a><span class='hs-comment'>-- High Level ``Setup'' functions</span>
<a name="line-75"></a>
<a name="line-76"></a><span class='hs-comment'>-- If the @PortID@ specifies a unix family socket and the @Hostname@</span>
<a name="line-77"></a><span class='hs-comment'>-- differs from that returned by @getHostname@ then an error is</span>
<a name="line-78"></a><span class='hs-comment'>-- raised. Alternatively an empty string may be given to @connectTo@</span>
<a name="line-79"></a><span class='hs-comment'>-- signalling that the current hostname applies.</span>
<a name="line-80"></a>
<a name="line-81"></a><a name="PortID"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>PortID</span> <span class='hs-keyglyph'>=</span>
<a name="line-82"></a> <span class='hs-conid'>Service</span> <span class='hs-conid'>String</span> <span class='hs-comment'>-- Service Name eg "ftp"</span>
<a name="line-83"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>PortNumber</span> <span class='hs-conid'>PortNumber</span> <span class='hs-comment'>-- User defined Port Number</span>
<a name="line-84"></a><span class='hs-cpp'>#if !defined(mingw32_HOST_OS)</span>
<a name="line-85"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>UnixSocket</span> <span class='hs-conid'>String</span> <span class='hs-comment'>-- Unix family socket in file system</span>
<a name="line-86"></a><span class='hs-cpp'>#endif</span>
<a name="line-87"></a> <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>
<a name="line-88"></a>
<a name="line-89"></a><span class='hs-comment'>-- | Calling 'connectTo' creates a client side socket which is</span>
<a name="line-90"></a><span class='hs-comment'>-- connected to the given host and port. The Protocol and socket type is</span>
<a name="line-91"></a><span class='hs-comment'>-- derived from the given port identifier. If a port number is given</span>
<a name="line-92"></a><span class='hs-comment'>-- then the result is always an internet family 'Stream' socket.</span>
<a name="line-93"></a>
<a name="line-94"></a><a name="connectTo"></a><span class='hs-definition'>connectTo</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>HostName</span> <span class='hs-comment'>-- Hostname</span>
<a name="line-95"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>PortID</span> <span class='hs-comment'>-- Port Identifier</span>
<a name="line-96"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>Handle</span> <span class='hs-comment'>-- Connected Socket</span>
<a name="line-97"></a>
<a name="line-98"></a><span class='hs-cpp'>#if defined(IPV6_SOCKET_SUPPORT)</span>
<a name="line-99"></a><span class='hs-comment'>-- IPv6 and IPv4.</span>
<a name="line-100"></a>
<a name="line-101"></a><span class='hs-definition'>connectTo</span> <span class='hs-varid'>hostname</span> <span class='hs-layout'>(</span><span class='hs-conid'>Service</span> <span class='hs-varid'>serv</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>connect'</span> <span class='hs-varid'>hostname</span> <span class='hs-varid'>serv</span>
<a name="line-102"></a>
<a name="line-103"></a><span class='hs-definition'>connectTo</span> <span class='hs-varid'>hostname</span> <span class='hs-layout'>(</span><span class='hs-conid'>PortNumber</span> <span class='hs-varid'>port</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>connect'</span> <span class='hs-varid'>hostname</span> <span class='hs-layout'>(</span><span class='hs-varid'>show</span> <span class='hs-varid'>port</span><span class='hs-layout'>)</span>
<a name="line-104"></a><span class='hs-cpp'>#else</span>
<a name="line-105"></a><span class='hs-comment'>-- IPv4 only.</span>
<a name="line-106"></a>
<a name="line-107"></a><span class='hs-definition'>connectTo</span> <span class='hs-varid'>hostname</span> <span class='hs-layout'>(</span><span class='hs-conid'>Service</span> <span class='hs-varid'>serv</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-108"></a> <span class='hs-varid'>proto</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>getProtocolNumber</span> <span class='hs-str'>"tcp"</span>
<a name="line-109"></a> <span class='hs-varid'>bracketOnError</span>
<a name="line-110"></a> <span class='hs-layout'>(</span><span class='hs-varid'>socket</span> <span class='hs-conid'>AF_INET</span> <span class='hs-conid'>Stream</span> <span class='hs-varid'>proto</span><span class='hs-layout'>)</span>
<a name="line-111"></a> <span class='hs-layout'>(</span><span class='hs-varid'>sClose</span><span class='hs-layout'>)</span> <span class='hs-comment'>-- only done if there's an error</span>
<a name="line-112"></a> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>sock</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span>
<a name="line-113"></a> <span class='hs-varid'>port</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>getServicePortNumber</span> <span class='hs-varid'>serv</span>
<a name="line-114"></a> <span class='hs-varid'>he</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>getHostByName</span> <span class='hs-varid'>hostname</span>
<a name="line-115"></a> <span class='hs-varid'>connect</span> <span class='hs-varid'>sock</span> <span class='hs-layout'>(</span><span class='hs-conid'>SockAddrInet</span> <span class='hs-varid'>port</span> <span class='hs-layout'>(</span><span class='hs-varid'>hostAddress</span> <span class='hs-varid'>he</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-116"></a> <span class='hs-varid'>socketToHandle</span> <span class='hs-varid'>sock</span> <span class='hs-conid'>ReadWriteMode</span>
<a name="line-117"></a> <span class='hs-layout'>)</span>
<a name="line-118"></a>
<a name="line-119"></a><span class='hs-definition'>connectTo</span> <span class='hs-varid'>hostname</span> <span class='hs-layout'>(</span><span class='hs-conid'>PortNumber</span> <span class='hs-varid'>port</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-120"></a> <span class='hs-varid'>proto</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>getProtocolNumber</span> <span class='hs-str'>"tcp"</span>
<a name="line-121"></a> <span class='hs-varid'>bracketOnError</span>
<a name="line-122"></a> <span class='hs-layout'>(</span><span class='hs-varid'>socket</span> <span class='hs-conid'>AF_INET</span> <span class='hs-conid'>Stream</span> <span class='hs-varid'>proto</span><span class='hs-layout'>)</span>
<a name="line-123"></a> <span class='hs-layout'>(</span><span class='hs-varid'>sClose</span><span class='hs-layout'>)</span> <span class='hs-comment'>-- only done if there's an error</span>
<a name="line-124"></a> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>sock</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span>
<a name="line-125"></a> <span class='hs-varid'>he</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>getHostByName</span> <span class='hs-varid'>hostname</span>
<a name="line-126"></a> <span class='hs-varid'>connect</span> <span class='hs-varid'>sock</span> <span class='hs-layout'>(</span><span class='hs-conid'>SockAddrInet</span> <span class='hs-varid'>port</span> <span class='hs-layout'>(</span><span class='hs-varid'>hostAddress</span> <span class='hs-varid'>he</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-127"></a> <span class='hs-varid'>socketToHandle</span> <span class='hs-varid'>sock</span> <span class='hs-conid'>ReadWriteMode</span>
<a name="line-128"></a> <span class='hs-layout'>)</span>
<a name="line-129"></a><span class='hs-cpp'>#endif</span>
<a name="line-130"></a>
<a name="line-131"></a><span class='hs-cpp'>#if !defined(mingw32_HOST_OS)</span>
<a name="line-132"></a><span class='hs-definition'>connectTo</span> <span class='hs-keyword'>_</span> <span class='hs-layout'>(</span><span class='hs-conid'>UnixSocket</span> <span class='hs-varid'>path</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-133"></a> <span class='hs-varid'>bracketOnError</span>
<a name="line-134"></a> <span class='hs-layout'>(</span><span class='hs-varid'>socket</span> <span class='hs-conid'>AF_UNIX</span> <span class='hs-conid'>Stream</span> <span class='hs-num'>0</span><span class='hs-layout'>)</span>
<a name="line-135"></a> <span class='hs-layout'>(</span><span class='hs-varid'>sClose</span><span class='hs-layout'>)</span>
<a name="line-136"></a> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>sock</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span>
<a name="line-137"></a> <span class='hs-varid'>connect</span> <span class='hs-varid'>sock</span> <span class='hs-layout'>(</span><span class='hs-conid'>SockAddrUnix</span> <span class='hs-varid'>path</span><span class='hs-layout'>)</span>
<a name="line-138"></a> <span class='hs-varid'>socketToHandle</span> <span class='hs-varid'>sock</span> <span class='hs-conid'>ReadWriteMode</span>
<a name="line-139"></a> <span class='hs-layout'>)</span>
<a name="line-140"></a><span class='hs-cpp'>#endif</span>
<a name="line-141"></a>
<a name="line-142"></a><span class='hs-cpp'>#if defined(IPV6_SOCKET_SUPPORT)</span>
<a name="line-143"></a><a name="connect'"></a><span class='hs-definition'>connect'</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>HostName</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ServiceName</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>Handle</span>
<a name="line-144"></a>
<a name="line-145"></a><span class='hs-definition'>connect'</span> <span class='hs-varid'>host</span> <span class='hs-varid'>serv</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-146"></a> <span class='hs-varid'>proto</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>getProtocolNumber</span> <span class='hs-str'>"tcp"</span>
<a name="line-147"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>hints</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>defaultHints</span> <span class='hs-layout'>{</span> <span class='hs-varid'>addrFlags</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>AI_ADDRCONFIG</span><span class='hs-keyglyph'>]</span>
<a name="line-148"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>addrProtocol</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>proto</span>
<a name="line-149"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>addrSocketType</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Stream</span> <span class='hs-layout'>}</span>
<a name="line-150"></a> <span class='hs-varid'>addrs</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>getAddrInfo</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-varid'>hints</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-varid'>host</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-varid'>serv</span><span class='hs-layout'>)</span>
<a name="line-151"></a> <span class='hs-varid'>firstSuccessful</span> <span class='hs-varop'>$</span> <span class='hs-varid'>map</span> <span class='hs-varid'>tryToConnect</span> <span class='hs-varid'>addrs</span>
<a name="line-152"></a> <span class='hs-keyword'>where</span>
<a name="line-153"></a> <span class='hs-varid'>tryToConnect</span> <span class='hs-varid'>addr</span> <span class='hs-keyglyph'>=</span>
<a name="line-154"></a> <span class='hs-varid'>bracketOnError</span>
<a name="line-155"></a> <span class='hs-layout'>(</span><span class='hs-varid'>socket</span> <span class='hs-layout'>(</span><span class='hs-varid'>addrFamily</span> <span class='hs-varid'>addr</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>addrSocketType</span> <span class='hs-varid'>addr</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>addrProtocol</span> <span class='hs-varid'>addr</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-156"></a> <span class='hs-layout'>(</span><span class='hs-varid'>sClose</span><span class='hs-layout'>)</span> <span class='hs-comment'>-- only done if there's an error</span>
<a name="line-157"></a> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>sock</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span>
<a name="line-158"></a> <span class='hs-varid'>connect</span> <span class='hs-varid'>sock</span> <span class='hs-layout'>(</span><span class='hs-varid'>addrAddress</span> <span class='hs-varid'>addr</span><span class='hs-layout'>)</span>
<a name="line-159"></a> <span class='hs-varid'>socketToHandle</span> <span class='hs-varid'>sock</span> <span class='hs-conid'>ReadWriteMode</span>
<a name="line-160"></a> <span class='hs-layout'>)</span>
<a name="line-161"></a><span class='hs-cpp'>#endif</span>
<a name="line-162"></a>
<a name="line-163"></a><span class='hs-comment'>-- | Creates the server side socket which has been bound to the</span>
<a name="line-164"></a><span class='hs-comment'>-- specified port.</span>
<a name="line-165"></a><span class='hs-comment'>--</span>
<a name="line-166"></a><span class='hs-comment'>-- 'maxListenQueue' (typically 128) is specified to the listen queue.</span>
<a name="line-167"></a><span class='hs-comment'>-- This is good enough for normal network servers but is too small</span>
<a name="line-168"></a><span class='hs-comment'>-- for high performance servers.</span>
<a name="line-169"></a><span class='hs-comment'>--</span>
<a name="line-170"></a><span class='hs-comment'>-- To avoid the \"Address already in use\" problems,</span>
<a name="line-171"></a><span class='hs-comment'>-- the 'ReuseAddr' socket option is set on the listening socket.</span>
<a name="line-172"></a><span class='hs-comment'>--</span>
<a name="line-173"></a><span class='hs-comment'>-- If available, the 'IPv6Only' socket option is set to 0</span>
<a name="line-174"></a><span class='hs-comment'>-- so that both IPv4 and IPv6 can be accepted with this socket.</span>
<a name="line-175"></a><span class='hs-comment'>--</span>
<a name="line-176"></a><span class='hs-comment'>-- If you don't like the behavior above, please use the lower level</span>
<a name="line-177"></a><span class='hs-comment'>-- 'Network.Socket.listen' instead.</span>
<a name="line-178"></a>
<a name="line-179"></a><a name="listenOn"></a><span class='hs-definition'>listenOn</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>PortID</span> <span class='hs-comment'>-- ^ Port Identifier</span>
<a name="line-180"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>Socket</span> <span class='hs-comment'>-- ^ Listening Socket</span>
<a name="line-181"></a>
<a name="line-182"></a><span class='hs-cpp'>#if defined(IPV6_SOCKET_SUPPORT)</span>
<a name="line-183"></a><span class='hs-comment'>-- IPv6 and IPv4.</span>
<a name="line-184"></a>
<a name="line-185"></a><span class='hs-definition'>listenOn</span> <span class='hs-layout'>(</span><span class='hs-conid'>Service</span> <span class='hs-varid'>serv</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>listen'</span> <span class='hs-varid'>serv</span>
<a name="line-186"></a>
<a name="line-187"></a><span class='hs-definition'>listenOn</span> <span class='hs-layout'>(</span><span class='hs-conid'>PortNumber</span> <span class='hs-varid'>port</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>listen'</span> <span class='hs-layout'>(</span><span class='hs-varid'>show</span> <span class='hs-varid'>port</span><span class='hs-layout'>)</span>
<a name="line-188"></a><span class='hs-cpp'>#else</span>
<a name="line-189"></a><span class='hs-comment'>-- IPv4 only.</span>
<a name="line-190"></a>
<a name="line-191"></a><span class='hs-definition'>listenOn</span> <span class='hs-layout'>(</span><span class='hs-conid'>Service</span> <span class='hs-varid'>serv</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-192"></a> <span class='hs-varid'>proto</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>getProtocolNumber</span> <span class='hs-str'>"tcp"</span>
<a name="line-193"></a> <span class='hs-varid'>bracketOnError</span>
<a name="line-194"></a> <span class='hs-layout'>(</span><span class='hs-varid'>socket</span> <span class='hs-conid'>AF_INET</span> <span class='hs-conid'>Stream</span> <span class='hs-varid'>proto</span><span class='hs-layout'>)</span>
<a name="line-195"></a> <span class='hs-layout'>(</span><span class='hs-varid'>sClose</span><span class='hs-layout'>)</span>
<a name="line-196"></a> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>sock</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span>
<a name="line-197"></a> <span class='hs-varid'>port</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>getServicePortNumber</span> <span class='hs-varid'>serv</span>
<a name="line-198"></a> <span class='hs-varid'>setSocketOption</span> <span class='hs-varid'>sock</span> <span class='hs-conid'>ReuseAddr</span> <span class='hs-num'>1</span>
<a name="line-199"></a> <span class='hs-varid'>bind</span> <span class='hs-varid'>sock</span> <span class='hs-layout'>(</span><span class='hs-conid'>SockAddrInet</span> <span class='hs-varid'>port</span> <span class='hs-varid'>iNADDR_ANY</span><span class='hs-layout'>)</span>
<a name="line-200"></a> <span class='hs-varid'>listen</span> <span class='hs-varid'>sock</span> <span class='hs-varid'>maxListenQueue</span>
<a name="line-201"></a> <span class='hs-varid'>return</span> <span class='hs-varid'>sock</span>
<a name="line-202"></a> <span class='hs-layout'>)</span>
<a name="line-203"></a>
<a name="line-204"></a><span class='hs-definition'>listenOn</span> <span class='hs-layout'>(</span><span class='hs-conid'>PortNumber</span> <span class='hs-varid'>port</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-205"></a> <span class='hs-varid'>proto</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>getProtocolNumber</span> <span class='hs-str'>"tcp"</span>
<a name="line-206"></a> <span class='hs-varid'>bracketOnError</span>
<a name="line-207"></a> <span class='hs-layout'>(</span><span class='hs-varid'>socket</span> <span class='hs-conid'>AF_INET</span> <span class='hs-conid'>Stream</span> <span class='hs-varid'>proto</span><span class='hs-layout'>)</span>
<a name="line-208"></a> <span class='hs-layout'>(</span><span class='hs-varid'>sClose</span><span class='hs-layout'>)</span>
<a name="line-209"></a> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>sock</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span>
<a name="line-210"></a> <span class='hs-varid'>setSocketOption</span> <span class='hs-varid'>sock</span> <span class='hs-conid'>ReuseAddr</span> <span class='hs-num'>1</span>
<a name="line-211"></a> <span class='hs-varid'>bind</span> <span class='hs-varid'>sock</span> <span class='hs-layout'>(</span><span class='hs-conid'>SockAddrInet</span> <span class='hs-varid'>port</span> <span class='hs-varid'>iNADDR_ANY</span><span class='hs-layout'>)</span>
<a name="line-212"></a> <span class='hs-varid'>listen</span> <span class='hs-varid'>sock</span> <span class='hs-varid'>maxListenQueue</span>
<a name="line-213"></a> <span class='hs-varid'>return</span> <span class='hs-varid'>sock</span>
<a name="line-214"></a> <span class='hs-layout'>)</span>
<a name="line-215"></a><span class='hs-cpp'>#endif</span>
<a name="line-216"></a>
<a name="line-217"></a><span class='hs-cpp'>#if !defined(mingw32_HOST_OS)</span>
<a name="line-218"></a><span class='hs-definition'>listenOn</span> <span class='hs-layout'>(</span><span class='hs-conid'>UnixSocket</span> <span class='hs-varid'>path</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span>
<a name="line-219"></a> <span class='hs-varid'>bracketOnError</span>
<a name="line-220"></a> <span class='hs-layout'>(</span><span class='hs-varid'>socket</span> <span class='hs-conid'>AF_UNIX</span> <span class='hs-conid'>Stream</span> <span class='hs-num'>0</span><span class='hs-layout'>)</span>
<a name="line-221"></a> <span class='hs-layout'>(</span><span class='hs-varid'>sClose</span><span class='hs-layout'>)</span>
<a name="line-222"></a> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>sock</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span>
<a name="line-223"></a> <span class='hs-varid'>setSocketOption</span> <span class='hs-varid'>sock</span> <span class='hs-conid'>ReuseAddr</span> <span class='hs-num'>1</span>
<a name="line-224"></a> <span class='hs-varid'>bind</span> <span class='hs-varid'>sock</span> <span class='hs-layout'>(</span><span class='hs-conid'>SockAddrUnix</span> <span class='hs-varid'>path</span><span class='hs-layout'>)</span>
<a name="line-225"></a> <span class='hs-varid'>listen</span> <span class='hs-varid'>sock</span> <span class='hs-varid'>maxListenQueue</span>
<a name="line-226"></a> <span class='hs-varid'>return</span> <span class='hs-varid'>sock</span>
<a name="line-227"></a> <span class='hs-layout'>)</span>
<a name="line-228"></a><span class='hs-cpp'>#endif</span>
<a name="line-229"></a>
<a name="line-230"></a><span class='hs-cpp'>#if defined(IPV6_SOCKET_SUPPORT)</span>
<a name="line-231"></a><a name="listen'"></a><span class='hs-definition'>listen'</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>ServiceName</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>Socket</span>
<a name="line-232"></a>
<a name="line-233"></a><span class='hs-definition'>listen'</span> <span class='hs-varid'>serv</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-234"></a> <span class='hs-varid'>proto</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>getProtocolNumber</span> <span class='hs-str'>"tcp"</span>
<a name="line-235"></a> <span class='hs-comment'>-- We should probably specify addrFamily = AF_INET6 and the filter</span>
<a name="line-236"></a> <span class='hs-comment'>-- code below should be removed. AI_ADDRCONFIG is probably not</span>
<a name="line-237"></a> <span class='hs-comment'>-- necessary. But this code is well-tested. So, let's keep it.</span>
<a name="line-238"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>hints</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>defaultHints</span> <span class='hs-layout'>{</span> <span class='hs-varid'>addrFlags</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>AI_ADDRCONFIG</span><span class='hs-layout'>,</span> <span class='hs-conid'>AI_PASSIVE</span><span class='hs-keyglyph'>]</span>
<a name="line-239"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>addrSocketType</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Stream</span>
<a name="line-240"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>addrProtocol</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>proto</span> <span class='hs-layout'>}</span>
<a name="line-241"></a> <span class='hs-varid'>addrs</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>getAddrInfo</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-varid'>hints</span><span class='hs-layout'>)</span> <span class='hs-conid'>Nothing</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-varid'>serv</span><span class='hs-layout'>)</span>
<a name="line-242"></a> <span class='hs-comment'>-- Choose an IPv6 socket if exists. This ensures the socket can</span>
<a name="line-243"></a> <span class='hs-comment'>-- handle both IPv4 and IPv6 if v6only is false.</span>
<a name="line-244"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>addrs'</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>filter</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>x</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>addrFamily</span> <span class='hs-varid'>x</span> <span class='hs-varop'>==</span> <span class='hs-conid'>AF_INET6</span><span class='hs-layout'>)</span> <span class='hs-varid'>addrs</span>
<a name="line-245"></a> <span class='hs-varid'>addr</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>if</span> <span class='hs-varid'>null</span> <span class='hs-varid'>addrs'</span> <span class='hs-keyword'>then</span> <span class='hs-varid'>head</span> <span class='hs-varid'>addrs</span> <span class='hs-keyword'>else</span> <span class='hs-varid'>head</span> <span class='hs-varid'>addrs'</span>
<a name="line-246"></a> <span class='hs-varid'>bracketOnError</span>
<a name="line-247"></a> <span class='hs-layout'>(</span><span class='hs-varid'>socket</span> <span class='hs-layout'>(</span><span class='hs-varid'>addrFamily</span> <span class='hs-varid'>addr</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>addrSocketType</span> <span class='hs-varid'>addr</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>addrProtocol</span> <span class='hs-varid'>addr</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-248"></a> <span class='hs-layout'>(</span><span class='hs-varid'>sClose</span><span class='hs-layout'>)</span>
<a name="line-249"></a> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>sock</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span>
<a name="line-250"></a> <span class='hs-varid'>setSocketOption</span> <span class='hs-varid'>sock</span> <span class='hs-conid'>ReuseAddr</span> <span class='hs-num'>1</span>
<a name="line-251"></a> <span class='hs-varid'>bind</span> <span class='hs-varid'>sock</span> <span class='hs-layout'>(</span><span class='hs-varid'>addrAddress</span> <span class='hs-varid'>addr</span><span class='hs-layout'>)</span>
<a name="line-252"></a> <span class='hs-varid'>listen</span> <span class='hs-varid'>sock</span> <span class='hs-varid'>maxListenQueue</span>
<a name="line-253"></a> <span class='hs-varid'>return</span> <span class='hs-varid'>sock</span>
<a name="line-254"></a> <span class='hs-layout'>)</span>
<a name="line-255"></a><span class='hs-cpp'>#endif</span>
<a name="line-256"></a>
<a name="line-257"></a><span class='hs-comment'>-- -----------------------------------------------------------------------------</span>
<a name="line-258"></a><span class='hs-comment'>-- accept</span>
<a name="line-259"></a>
<a name="line-260"></a><a name="accept"></a><span class='hs-comment'>-- | Accept a connection on a socket created by 'listenOn'. Normal</span>
<a name="line-261"></a><span class='hs-comment'>-- I\/O operations (see "System.IO") can be used on the 'Handle'</span>
<a name="line-262"></a><span class='hs-comment'>-- returned to communicate with the client.</span>
<a name="line-263"></a><span class='hs-comment'>-- Notice that although you can pass any Socket to Network.accept,</span>
<a name="line-264"></a><span class='hs-comment'>-- only sockets of either AF_UNIX, AF_INET, or AF_INET6 will work</span>
<a name="line-265"></a><span class='hs-comment'>-- (this shouldn't be a problem, though). When using AF_UNIX, HostName</span>
<a name="line-266"></a><span class='hs-comment'>-- will be set to the path of the socket and PortNumber to -1.</span>
<a name="line-267"></a><span class='hs-comment'>--</span>
<a name="line-268"></a><span class='hs-definition'>accept</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Socket</span> <span class='hs-comment'>-- ^ Listening Socket</span>
<a name="line-269"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-layout'>(</span><span class='hs-conid'>Handle</span><span class='hs-layout'>,</span>
<a name="line-270"></a> <span class='hs-conid'>HostName</span><span class='hs-layout'>,</span>
<a name="line-271"></a> <span class='hs-conid'>PortNumber</span><span class='hs-layout'>)</span> <span class='hs-comment'>-- ^ Triple of: read\/write 'Handle' for</span>
<a name="line-272"></a> <span class='hs-comment'>-- communicating with the client,</span>
<a name="line-273"></a> <span class='hs-comment'>-- the 'HostName' of the peer socket, and</span>
<a name="line-274"></a> <span class='hs-comment'>-- the 'PortNumber' of the remote connection.</span>
<a name="line-275"></a><span class='hs-definition'>accept</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-keyword'>_</span> <span class='hs-conid'>AF_INET</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-276"></a> <span class='hs-keyglyph'>~</span><span class='hs-layout'>(</span><span class='hs-varid'>sock'</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-conid'>SockAddrInet</span> <span class='hs-varid'>port</span> <span class='hs-varid'>haddr</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-conid'>Socket</span><span class='hs-varop'>.</span><span class='hs-varid'>accept</span> <span class='hs-varid'>sock</span>
<a name="line-277"></a> <span class='hs-varid'>peer</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>catchIO</span>
<a name="line-278"></a> <span class='hs-layout'>(</span><span class='hs-keyword'>do</span>
<a name="line-279"></a> <span class='hs-layout'>(</span><span class='hs-conid'>HostEntry</span> <span class='hs-varid'>peer</span> <span class='hs-keyword'>_</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'>getHostByAddr</span> <span class='hs-conid'>AF_INET</span> <span class='hs-varid'>haddr</span>
<a name="line-280"></a> <span class='hs-varid'>return</span> <span class='hs-varid'>peer</span>
<a name="line-281"></a> <span class='hs-layout'>)</span>
<a name="line-282"></a> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-sel'>_e</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>inet_ntoa</span> <span class='hs-varid'>haddr</span><span class='hs-layout'>)</span>
<a name="line-283"></a> <span class='hs-comment'>-- if getHostByName fails, we fall back to the IP address</span>
<a name="line-284"></a> <span class='hs-varid'>handle</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>socketToHandle</span> <span class='hs-varid'>sock'</span> <span class='hs-conid'>ReadWriteMode</span>
<a name="line-285"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>handle</span><span class='hs-layout'>,</span> <span class='hs-varid'>peer</span><span class='hs-layout'>,</span> <span class='hs-varid'>port</span><span class='hs-layout'>)</span>
<a name="line-286"></a><span class='hs-cpp'>#if defined(IPV6_SOCKET_SUPPORT)</span>
<a name="line-287"></a><span class='hs-definition'>accept</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-keyword'>_</span> <span class='hs-conid'>AF_INET6</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-288"></a> <span class='hs-layout'>(</span><span class='hs-varid'>sock'</span><span class='hs-layout'>,</span> <span class='hs-varid'>addr</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-conid'>Socket</span><span class='hs-varop'>.</span><span class='hs-varid'>accept</span> <span class='hs-varid'>sock</span>
<a name="line-289"></a> <span class='hs-varid'>peer</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>catchIO</span> <span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-varid'>fromJust</span> <span class='hs-varop'>.</span> <span class='hs-varid'>fst</span><span class='hs-layout'>)</span> <span class='hs-varop'>`liftM`</span> <span class='hs-varid'>getNameInfo</span> <span class='hs-conid'>[]</span> <span class='hs-conid'>True</span> <span class='hs-conid'>False</span> <span class='hs-varid'>addr</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span>
<a name="line-290"></a> <span class='hs-keyglyph'>\</span><span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>case</span> <span class='hs-varid'>addr</span> <span class='hs-keyword'>of</span>
<a name="line-291"></a> <span class='hs-conid'>SockAddrInet</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>inet_ntoa</span> <span class='hs-varid'>a</span>
<a name="line-292"></a> <span class='hs-conid'>SockAddrInet6</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>a</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>show</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-293"></a><span class='hs-cpp'>#if defined(mingw32_HOST_OS)</span>
<a name="line-294"></a> <span class='hs-conid'>SockAddrUnix</span> <span class='hs-layout'>{</span><span class='hs-layout'>}</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>throwIO</span> <span class='hs-varop'>$</span> <span class='hs-varid'>userError</span> <span class='hs-str'>"accept: socket address not supported on this platform."</span>
<a name="line-295"></a><span class='hs-cpp'>#else</span>
<a name="line-296"></a> <span class='hs-conid'>SockAddrUnix</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-varid'>a</span>
<a name="line-297"></a><span class='hs-cpp'>#endif</span>
<a name="line-298"></a><span class='hs-cpp'>#if defined(CAN_SOCKET_SUPPORT)</span>
<a name="line-299"></a> <span class='hs-conid'>SockAddrCan</span> <span class='hs-layout'>{</span><span class='hs-layout'>}</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>throwIO</span> <span class='hs-varop'>$</span> <span class='hs-varid'>userError</span> <span class='hs-str'>"accept: unsupported for CAN peer."</span>
<a name="line-300"></a><span class='hs-cpp'>#else</span>
<a name="line-301"></a> <span class='hs-conid'>SockAddrCan</span> <span class='hs-layout'>{</span><span class='hs-layout'>}</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>throwIO</span> <span class='hs-varop'>$</span> <span class='hs-varid'>userError</span> <span class='hs-str'>"accept: socket address not supported on this platform."</span>
<a name="line-302"></a><span class='hs-cpp'>#endif</span>
<a name="line-303"></a> <span class='hs-varid'>handle</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>socketToHandle</span> <span class='hs-varid'>sock'</span> <span class='hs-conid'>ReadWriteMode</span>
<a name="line-304"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>port</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>addr</span> <span class='hs-keyword'>of</span>
<a name="line-305"></a> <span class='hs-conid'>SockAddrInet</span> <span class='hs-varid'>p</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>p</span>
<a name="line-306"></a> <span class='hs-conid'>SockAddrInet6</span> <span class='hs-varid'>p</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>p</span>
<a name="line-307"></a> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-comment'>-</span><span class='hs-num'>1</span>
<a name="line-308"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>handle</span><span class='hs-layout'>,</span> <span class='hs-varid'>peer</span><span class='hs-layout'>,</span> <span class='hs-varid'>port</span><span class='hs-layout'>)</span>
<a name="line-309"></a><span class='hs-cpp'>#endif</span>
<a name="line-310"></a><span class='hs-cpp'>#if !defined(mingw32_HOST_OS)</span>
<a name="line-311"></a><span class='hs-definition'>accept</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-keyword'>_</span> <span class='hs-conid'>AF_UNIX</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-312"></a> <span class='hs-keyglyph'>~</span><span class='hs-layout'>(</span><span class='hs-varid'>sock'</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-conid'>SockAddrUnix</span> <span class='hs-varid'>path</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-conid'>Socket</span><span class='hs-varop'>.</span><span class='hs-varid'>accept</span> <span class='hs-varid'>sock</span>
<a name="line-313"></a> <span class='hs-varid'>handle</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>socketToHandle</span> <span class='hs-varid'>sock'</span> <span class='hs-conid'>ReadWriteMode</span>
<a name="line-314"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>handle</span><span class='hs-layout'>,</span> <span class='hs-varid'>path</span><span class='hs-layout'>,</span> <span class='hs-comment'>-</span><span class='hs-num'>1</span><span class='hs-layout'>)</span>
<a name="line-315"></a><span class='hs-cpp'>#endif</span>
<a name="line-316"></a><span class='hs-definition'>accept</span> <span class='hs-layout'>(</span><span class='hs-conid'>MkSocket</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>family</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span>
<a name="line-317"></a> <span class='hs-varid'>error</span> <span class='hs-varop'>$</span> <span class='hs-str'>"Sorry, address family "</span> <span class='hs-varop'>++</span> <span class='hs-layout'>(</span><span class='hs-varid'>show</span> <span class='hs-keyword'>family</span><span class='hs-layout'>)</span> <span class='hs-varop'>++</span> <span class='hs-str'>" is not supported!"</span>
<a name="line-318"></a>
<a name="line-319"></a>
<a name="line-320"></a><a name="sClose"></a><span class='hs-comment'>-- | Close the socket. Sending data to or receiving data from closed socket</span>
<a name="line-321"></a><span class='hs-comment'>-- may lead to undefined behaviour.</span>
<a name="line-322"></a><span class='hs-definition'>sClose</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Socket</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-323"></a><span class='hs-definition'>sClose</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>close</span> <span class='hs-comment'>-- Explicit redefinition because Network.sClose is deprecated,</span>
<a name="line-324"></a> <span class='hs-comment'>-- hence the re-export would also be marked as such.</span>
<a name="line-325"></a>
<a name="line-326"></a><span class='hs-comment'>-- -----------------------------------------------------------------------------</span>
<a name="line-327"></a><span class='hs-comment'>-- sendTo/recvFrom</span>
<a name="line-328"></a>
<a name="line-329"></a><span class='hs-comment'>{-$sendrecv
<a name="line-330"></a>Send and receive data from\/to the given host and port number. These
<a name="line-331"></a>should normally only be used where the socket will not be required for
<a name="line-332"></a>further calls. Also, note that due to the use of 'hGetContents' in 'recvFrom'
<a name="line-333"></a>the socket will remain open (i.e. not available) even if the function already
<a name="line-334"></a>returned. Their use is strongly discouraged except for small test-applications
<a name="line-335"></a>or invocations from the command line.
<a name="line-336"></a>-}</span>
<a name="line-337"></a>
<a name="line-338"></a><a name="sendTo"></a><span class='hs-definition'>sendTo</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>HostName</span> <span class='hs-comment'>-- Hostname</span>
<a name="line-339"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>PortID</span> <span class='hs-comment'>-- Port Number</span>
<a name="line-340"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>String</span> <span class='hs-comment'>-- Message to send</span>
<a name="line-341"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-342"></a><span class='hs-definition'>sendTo</span> <span class='hs-varid'>h</span> <span class='hs-varid'>p</span> <span class='hs-varid'>msg</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-343"></a> <span class='hs-varid'>s</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>connectTo</span> <span class='hs-varid'>h</span> <span class='hs-varid'>p</span>
<a name="line-344"></a> <span class='hs-varid'>hPutStr</span> <span class='hs-varid'>s</span> <span class='hs-varid'>msg</span>
<a name="line-345"></a> <span class='hs-varid'>hClose</span> <span class='hs-varid'>s</span>
<a name="line-346"></a>
<a name="line-347"></a><a name="recvFrom"></a><span class='hs-definition'>recvFrom</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>HostName</span> <span class='hs-comment'>-- Hostname</span>
<a name="line-348"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>PortID</span> <span class='hs-comment'>-- Port Number</span>
<a name="line-349"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>String</span> <span class='hs-comment'>-- Received Data</span>
<a name="line-350"></a>
<a name="line-351"></a><span class='hs-cpp'>#if defined(IPV6_SOCKET_SUPPORT)</span>
<a name="line-352"></a><span class='hs-definition'>recvFrom</span> <span class='hs-varid'>host</span> <span class='hs-varid'>port</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-353"></a> <span class='hs-varid'>proto</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>getProtocolNumber</span> <span class='hs-str'>"tcp"</span>
<a name="line-354"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>hints</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>defaultHints</span> <span class='hs-layout'>{</span> <span class='hs-varid'>addrFlags</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>AI_ADDRCONFIG</span><span class='hs-keyglyph'>]</span>
<a name="line-355"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>addrProtocol</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>proto</span>
<a name="line-356"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>addrSocketType</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Stream</span> <span class='hs-layout'>}</span>
<a name="line-357"></a> <span class='hs-varid'>allowed</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>map</span> <span class='hs-varid'>addrAddress</span> <span class='hs-varop'>`liftM`</span> <span class='hs-varid'>getAddrInfo</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-varid'>hints</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-varid'>host</span><span class='hs-layout'>)</span>
<a name="line-358"></a> <span class='hs-conid'>Nothing</span>
<a name="line-359"></a> <span class='hs-varid'>s</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>listenOn</span> <span class='hs-varid'>port</span>
<a name="line-360"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>waiting</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-361"></a> <span class='hs-layout'>(</span><span class='hs-varid'>s'</span><span class='hs-layout'>,</span> <span class='hs-varid'>addr</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-conid'>Socket</span><span class='hs-varop'>.</span><span class='hs-varid'>accept</span> <span class='hs-varid'>s</span>
<a name="line-362"></a> <span class='hs-keyword'>if</span> <span class='hs-varid'>not</span> <span class='hs-layout'>(</span><span class='hs-varid'>addr</span> <span class='hs-varop'>`oneOf`</span> <span class='hs-varid'>allowed</span><span class='hs-layout'>)</span>
<a name="line-363"></a> <span class='hs-keyword'>then</span> <span class='hs-varid'>sClose</span> <span class='hs-varid'>s'</span> <span class='hs-varop'>>></span> <span class='hs-varid'>waiting</span>
<a name="line-364"></a> <span class='hs-keyword'>else</span> <span class='hs-varid'>socketToHandle</span> <span class='hs-varid'>s'</span> <span class='hs-conid'>ReadMode</span> <span class='hs-varop'>>>=</span> <span class='hs-varid'>hGetContents</span>
<a name="line-365"></a> <span class='hs-varid'>waiting</span>
<a name="line-366"></a> <span class='hs-keyword'>where</span>
<a name="line-367"></a> <span class='hs-varid'>a</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-conid'>SockAddrInet</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>ha</span><span class='hs-layout'>)</span> <span class='hs-varop'>`oneOf`</span> <span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-conid'>SockAddrInet</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>hb</span><span class='hs-layout'>)</span><span class='hs-conop'>:</span><span class='hs-varid'>bs</span><span class='hs-layout'>)</span>
<a name="line-368"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>ha</span> <span class='hs-varop'>==</span> <span class='hs-varid'>hb</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>True</span>
<a name="line-369"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>a</span> <span class='hs-varop'>`oneOf`</span> <span class='hs-varid'>bs</span>
<a name="line-370"></a> <span class='hs-varid'>a</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-conid'>SockAddrInet6</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>ha</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-varop'>`oneOf`</span> <span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-conid'>SockAddrInet6</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>hb</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span><span class='hs-conop'>:</span><span class='hs-varid'>bs</span><span class='hs-layout'>)</span>
<a name="line-371"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>ha</span> <span class='hs-varop'>==</span> <span class='hs-varid'>hb</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>True</span>
<a name="line-372"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>a</span> <span class='hs-varop'>`oneOf`</span> <span class='hs-varid'>bs</span>
<a name="line-373"></a> <span class='hs-keyword'>_</span> <span class='hs-varop'>`oneOf`</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>False</span>
<a name="line-374"></a><span class='hs-cpp'>#else</span>
<a name="line-375"></a><span class='hs-definition'>recvFrom</span> <span class='hs-varid'>host</span> <span class='hs-varid'>port</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-376"></a> <span class='hs-varid'>ip</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>getHostByName</span> <span class='hs-varid'>host</span>
<a name="line-377"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>ipHs</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>hostAddresses</span> <span class='hs-varid'>ip</span>
<a name="line-378"></a> <span class='hs-varid'>s</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>listenOn</span> <span class='hs-varid'>port</span>
<a name="line-379"></a> <span class='hs-keyword'>let</span>
<a name="line-380"></a> <span class='hs-varid'>waiting</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-381"></a> <span class='hs-keyglyph'>~</span><span class='hs-layout'>(</span><span class='hs-varid'>s'</span><span class='hs-layout'>,</span> <span class='hs-conid'>SockAddrInet</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>haddr</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-conid'>Socket</span><span class='hs-varop'>.</span><span class='hs-varid'>accept</span> <span class='hs-varid'>s</span>
<a name="line-382"></a> <span class='hs-varid'>he</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>getHostByAddr</span> <span class='hs-conid'>AF_INET</span> <span class='hs-varid'>haddr</span>
<a name="line-383"></a> <span class='hs-keyword'>if</span> <span class='hs-varid'>not</span> <span class='hs-layout'>(</span><span class='hs-varid'>any</span> <span class='hs-layout'>(</span><span class='hs-varop'>`elem`</span> <span class='hs-varid'>ipHs</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>hostAddresses</span> <span class='hs-varid'>he</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-384"></a> <span class='hs-keyword'>then</span> <span class='hs-keyword'>do</span>
<a name="line-385"></a> <span class='hs-varid'>sClose</span> <span class='hs-varid'>s'</span>
<a name="line-386"></a> <span class='hs-varid'>waiting</span>
<a name="line-387"></a> <span class='hs-keyword'>else</span> <span class='hs-keyword'>do</span>
<a name="line-388"></a> <span class='hs-varid'>h</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>socketToHandle</span> <span class='hs-varid'>s'</span> <span class='hs-conid'>ReadMode</span>
<a name="line-389"></a> <span class='hs-varid'>msg</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>hGetContents</span> <span class='hs-varid'>h</span>
<a name="line-390"></a> <span class='hs-varid'>return</span> <span class='hs-varid'>msg</span>
<a name="line-391"></a>
<a name="line-392"></a> <span class='hs-varid'>message</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>waiting</span>
<a name="line-393"></a> <span class='hs-varid'>return</span> <span class='hs-varid'>message</span>
<a name="line-394"></a><span class='hs-cpp'>#endif</span>
<a name="line-395"></a>
<a name="line-396"></a><span class='hs-comment'>-- ---------------------------------------------------------------------------</span>
<a name="line-397"></a><span class='hs-comment'>-- Access function returning the port type/id of socket.</span>
<a name="line-398"></a>
<a name="line-399"></a><a name="socketPort"></a><span class='hs-comment'>-- | Returns the 'PortID' associated with a given socket.</span>
<a name="line-400"></a><span class='hs-definition'>socketPort</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Socket</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>PortID</span>
<a name="line-401"></a><span class='hs-definition'>socketPort</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-402"></a> <span class='hs-varid'>sockaddr</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>getSocketName</span> <span class='hs-varid'>s</span>
<a name="line-403"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>sockaddr</span> <span class='hs-keyword'>of</span>
<a name="line-404"></a> <span class='hs-conid'>SockAddrInet</span> <span class='hs-varid'>port</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-conid'>PortNumber</span> <span class='hs-varid'>port</span>
<a name="line-405"></a><span class='hs-cpp'>#if defined(IPV6_SOCKET_SUPPORT)</span>
<a name="line-406"></a> <span class='hs-conid'>SockAddrInet6</span> <span class='hs-varid'>port</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-conid'>PortNumber</span> <span class='hs-varid'>port</span>
<a name="line-407"></a><span class='hs-cpp'>#else</span>
<a name="line-408"></a> <span class='hs-conid'>SockAddrInet6</span> <span class='hs-layout'>{</span><span class='hs-layout'>}</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>throwIO</span> <span class='hs-varop'>$</span> <span class='hs-varid'>userError</span> <span class='hs-str'>"socketPort: socket address not supported on this platform."</span>
<a name="line-409"></a><span class='hs-cpp'>#endif</span>
<a name="line-410"></a><span class='hs-cpp'>#if defined(mingw32_HOST_OS)</span>
<a name="line-411"></a> <span class='hs-conid'>SockAddrUnix</span> <span class='hs-layout'>{</span><span class='hs-layout'>}</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>throwIO</span> <span class='hs-varop'>$</span> <span class='hs-varid'>userError</span> <span class='hs-str'>"socketPort: socket address not supported on this platform."</span>
<a name="line-412"></a><span class='hs-cpp'>#else</span>
<a name="line-413"></a> <span class='hs-conid'>SockAddrUnix</span> <span class='hs-varid'>path</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-conid'>UnixSocket</span> <span class='hs-varid'>path</span>
<a name="line-414"></a><span class='hs-cpp'>#endif</span>
<a name="line-415"></a> <span class='hs-conid'>SockAddrCan</span> <span class='hs-layout'>{</span><span class='hs-layout'>}</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>throwIO</span> <span class='hs-varop'>$</span> <span class='hs-varid'>userError</span> <span class='hs-str'>"socketPort: CAN address not supported."</span>
<a name="line-416"></a>
<a name="line-417"></a><span class='hs-comment'>-- ---------------------------------------------------------------------------</span>
<a name="line-418"></a><span class='hs-comment'>-- Utils</span>
<a name="line-419"></a>
<a name="line-420"></a><a name="bracketOnError"></a><span class='hs-comment'>-- Like bracket, but only performs the final action if there was an</span>
<a name="line-421"></a><span class='hs-comment'>-- exception raised by the middle bit.</span>
<a name="line-422"></a><span class='hs-definition'>bracketOnError</span>
<a name="line-423"></a> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>IO</span> <span class='hs-varid'>a</span> <span class='hs-comment'>-- ^ computation to run first (\"acquire resource\")</span>
<a name="line-424"></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-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-comment'>-- ^ computation to run last (\"release resource\")</span>
<a name="line-425"></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-varid'>c</span><span class='hs-layout'>)</span> <span class='hs-comment'>-- ^ computation to run in-between</span>
<a name="line-426"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-varid'>c</span> <span class='hs-comment'>-- returns the value from the in-between computation</span>
<a name="line-427"></a><span class='hs-definition'>bracketOnError</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Exception</span><span class='hs-varop'>.</span><span class='hs-varid'>bracketOnError</span>
<a name="line-428"></a>
<a name="line-429"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span>
<a name="line-430"></a><span class='hs-comment'>-- Extra documentation</span>
<a name="line-431"></a>
<a name="line-432"></a><span class='hs-comment'>{-$buffering
<a name="line-433"></a>
<a name="line-434"></a>The 'Handle' returned by 'connectTo' and 'accept' is block-buffered by
<a name="line-435"></a>default. For an interactive application you may want to set the
<a name="line-436"></a>buffering mode on the 'Handle' to
<a name="line-437"></a>'LineBuffering' or 'NoBuffering', like so:
<a name="line-438"></a>
<a name="line-439"></a>> h <- connectTo host port
<a name="line-440"></a>> hSetBuffering h LineBuffering
<a name="line-441"></a>-}</span>
<a name="line-442"></a>
<a name="line-443"></a><span class='hs-comment'>{-$performance
<a name="line-444"></a>
<a name="line-445"></a>For really fast I\/O, it might be worth looking at the 'hGetBuf' and
<a name="line-446"></a>'hPutBuf' family of functions in "System.IO".
<a name="line-447"></a>-}</span>
<a name="line-448"></a>
<a name="line-449"></a><a name="catchIO"></a><span class='hs-definition'>catchIO</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-layout'>(</span><span class='hs-conid'>Exception</span><span class='hs-varop'>.</span><span class='hs-conid'>IOException</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-varid'>a</span>
<a name="line-450"></a><span class='hs-cpp'>#if MIN_VERSION_base(4,0,0)</span>
<a name="line-451"></a><span class='hs-definition'>catchIO</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Exception</span><span class='hs-varop'>.</span><span class='hs-varid'>catch</span>
<a name="line-452"></a><span class='hs-cpp'>#else</span>
<a name="line-453"></a><span class='hs-definition'>catchIO</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Exception</span><span class='hs-varop'>.</span><span class='hs-varid'>catchJust</span> <span class='hs-conid'>Exception</span><span class='hs-varop'>.</span><span class='hs-varid'>ioErrors</span>
<a name="line-454"></a><span class='hs-cpp'>#endif</span>
<a name="line-455"></a>
<a name="line-456"></a><a name="tryIO"></a><span class='hs-comment'>-- Version of try implemented in terms of the locally defined catchIO</span>
<a name="line-457"></a><span class='hs-definition'>tryIO</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-layout'>(</span><span class='hs-conid'>Either</span> <span class='hs-conid'>Exception</span><span class='hs-varop'>.</span><span class='hs-conid'>IOException</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-458"></a><span class='hs-definition'>tryIO</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>catchIO</span> <span class='hs-layout'>(</span><span class='hs-varid'>liftM</span> <span class='hs-conid'>Right</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>return</span> <span class='hs-varop'>.</span> <span class='hs-conid'>Left</span><span class='hs-layout'>)</span>
<a name="line-459"></a>
<a name="line-460"></a><a name="firstSuccessful"></a><span class='hs-comment'>-- Returns the first action from a list which does not throw an exception.</span>
<a name="line-461"></a><span class='hs-comment'>-- If all the actions throw exceptions (and the list of actions is not empty),</span>
<a name="line-462"></a><span class='hs-comment'>-- the last exception is thrown.</span>
<a name="line-463"></a><span class='hs-comment'>-- The operations are run outside of the catchIO cleanup handler because</span>
<a name="line-464"></a><span class='hs-comment'>-- catchIO masks asynchronous exceptions in the cleanup handler.</span>
<a name="line-465"></a><span class='hs-comment'>-- In the case of complete failure, the last exception is actually thrown.</span>
<a name="line-466"></a><span class='hs-definition'>firstSuccessful</span> <span class='hs-keyglyph'>::</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-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-varid'>a</span>
<a name="line-467"></a><span class='hs-definition'>firstSuccessful</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>go</span> <span class='hs-conid'>Nothing</span>
<a name="line-468"></a> <span class='hs-keyword'>where</span>
<a name="line-469"></a> <span class='hs-comment'>-- Attempt the next operation, remember exception on failure</span>
<a name="line-470"></a> <span class='hs-varid'>go</span> <span class='hs-keyword'>_</span> <span class='hs-layout'>(</span><span class='hs-varid'>p</span><span class='hs-conop'>:</span><span class='hs-varid'>ps</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span>
<a name="line-471"></a> <span class='hs-keyword'>do</span> <span class='hs-varid'>r</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>tryIO</span> <span class='hs-varid'>p</span>
<a name="line-472"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>r</span> <span class='hs-keyword'>of</span>
<a name="line-473"></a> <span class='hs-conid'>Right</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-varid'>x</span>
<a name="line-474"></a> <span class='hs-conid'>Left</span> <span class='hs-varid'>e</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>go</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-varid'>e</span><span class='hs-layout'>)</span> <span class='hs-varid'>ps</span>
<a name="line-475"></a>
<a name="line-476"></a> <span class='hs-comment'>-- All operations failed, throw error if one exists</span>
<a name="line-477"></a> <span class='hs-varid'>go</span> <span class='hs-conid'>Nothing</span> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>error</span> <span class='hs-str'>"firstSuccessful: empty list"</span>
<a name="line-478"></a> <span class='hs-varid'>go</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-varid'>e</span><span class='hs-layout'>)</span> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Exception</span><span class='hs-varop'>.</span><span class='hs-varid'>throwIO</span> <span class='hs-varid'>e</span>
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