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<h4 class="subsection">16.9.5 Transferring Data</h4>

<p><a name="index-reading-from-a-socket-1804"></a><a name="index-writing-to-a-socket-1805"></a>
Once a socket has been connected to a peer, you can use the ordinary
<code>read</code> and <code>write</code> operations (see <a href="I_002fO-Primitives.html#I_002fO-Primitives">I/O Primitives</a>) to
transfer data.  A socket is a two-way communications channel, so read
and write operations can be performed at either end.

   <p>There are also some I/O modes that are specific to socket operations. 
In order to specify these modes, you must use the <code>recv</code> and
<code>send</code> functions instead of the more generic <code>read</code> and
<code>write</code> functions.  The <code>recv</code> and <code>send</code> functions take
an additional argument which you can use to specify various flags to
control special I/O modes.  For example, you can specify the
<code>MSG_OOB</code> flag to read or write out-of-band data, the
<code>MSG_PEEK</code> flag to peek at input, or the <code>MSG_DONTROUTE</code> flag
to control inclusion of routing information on output.

<ul class="menu">
<li><a accesskey="1" href="Sending-Data.html#Sending-Data">Sending Data</a>: 		Sending data with <code>send</code>. 
<li><a accesskey="2" href="Receiving-Data.html#Receiving-Data">Receiving Data</a>: 		Reading data with <code>recv</code>. 
<li><a accesskey="3" href="Socket-Data-Options.html#Socket-Data-Options">Socket Data Options</a>: 		Using <code>send</code> and <code>recv</code>. 
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