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<h3 class="section">16.12 Socket Options</h3>

<p><a name="index-socket-options-1825"></a>
This section describes how to read or set various options that modify
the behavior of sockets and their underlying communications protocols.

   <p><a name="index-level_002c-for-socket-options-1826"></a><a name="index-socket-option-level-1827"></a>When you are manipulating a socket option, you must specify which
<dfn>level</dfn> the option pertains to.  This describes whether the option
applies to the socket interface, or to a lower-level communications
protocol interface.

<ul class="menu">
<li><a accesskey="1" href="Socket-Option-Functions.html#Socket-Option-Functions">Socket Option Functions</a>:      The basic functions for setting and getting
                                 socket options. 
<li><a accesskey="2" href="Socket_002dLevel-Options.html#Socket_002dLevel-Options">Socket-Level Options</a>:         Details of the options at the socket level. 
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