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<div id="projectname">libx52
&#160;<span id="projectnumber">0.2.3</span>
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<div id="projectbrief">Saitek X52/X52Pro drivers for Linux/Unix</div>
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<a href="#func-members">Functions</a> </div>
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<div class="title">Daemon communication</div> </div>
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<p>These functions are used to communicate with the X52 daemon.
<a href="#details">More...</a></p>
<table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="func-members"></a>
Functions</h2></td></tr>
<tr class="memitem:ga59b382427afc417499311336747fb191"><td class="memItemLeft" align="right" valign="top">int&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__x52dcomm.html#ga59b382427afc417499311336747fb191">x52d_dial_command</a> (const char *sock_path)</td></tr>
<tr class="memdesc:ga59b382427afc417499311336747fb191"><td class="mdescLeft">&#160;</td><td class="mdescRight">Open a connection to the daemon. <a href="group__x52dcomm.html#ga59b382427afc417499311336747fb191">More...</a><br /></td></tr>
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<tr class="memitem:gad72175611919fcafc0a0533b7a01f167"><td class="memItemLeft" align="right" valign="top">int&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__x52dcomm.html#gad72175611919fcafc0a0533b7a01f167">x52d_send_command</a> (int sock_fd, char *buffer, size_t buflen)</td></tr>
<tr class="memdesc:gad72175611919fcafc0a0533b7a01f167"><td class="mdescLeft">&#160;</td><td class="mdescRight">Send a command to the daemon and retrieve the response. <a href="group__x52dcomm.html#gad72175611919fcafc0a0533b7a01f167">More...</a><br /></td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<p>These functions are used to communicate with the X52 daemon. </p>
<h2 class="groupheader">Function Documentation</h2>
<a id="ga59b382427afc417499311336747fb191"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ga59b382427afc417499311336747fb191">&#9670;&nbsp;</a></span>x52d_dial_command()</h2>
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<td class="memname">int x52d_dial_command </td>
<td>(</td>
<td class="paramtype">const char *&#160;</td>
<td class="paramname"><em>sock_path</em></td><td>)</td>
<td></td>
</tr>
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<p>Open a connection to the daemon. </p>
<p>This method opens a socket connection to the daemon command socket. This socket allows the client to issue commands and retrieve data. The <code>sock_path</code> parameter may be NULL, in which case, it will use the default socket path.</p>
<p>The client will need to use the returned descriptor to communicate with the daemon using <a class="el" href="group__x52dcomm.html#gad72175611919fcafc0a0533b7a01f167">x52d_send_command</a>. Once finished, the client may use the <code>close(2)</code> method to close the file descriptor.</p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">sock_path</td><td>Path to the daemon command socket.</td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>Non-negative socket file descriptor on success. </dd>
<dd>
-1 on failure, and set <code>errno</code> accordingly.</dd></dl>
<dl class="exception"><dt>Exceptions</dt><dd>
<table class="exception">
<tr><td class="paramname">E2BIG</td><td>returned if the passed socket path is too big </td></tr>
</table>
</dd>
</dl>
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</div>
<a id="gad72175611919fcafc0a0533b7a01f167"></a>
<h2 class="memtitle"><span class="permalink"><a href="#gad72175611919fcafc0a0533b7a01f167">&#9670;&nbsp;</a></span>x52d_send_command()</h2>
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<td class="memname">int x52d_send_command </td>
<td>(</td>
<td class="paramtype">int&#160;</td>
<td class="paramname"><em>sock_fd</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
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<td class="paramtype">char *&#160;</td>
<td class="paramname"><em>buffer</em>, </td>
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<td class="paramtype">size_t&#160;</td>
<td class="paramname"><em>buflen</em>&#160;</td>
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<td></td>
<td>)</td>
<td></td><td></td>
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<p>Send a command to the daemon and retrieve the response. </p>
<p>The client sends the command and parameters as a single NULL terminated string, and retrieves the response in the same manner. Depending on the result, the return status is either a positive integer or -1, and <code>errno</code> is set accordingly.</p>
<p><code>buffer</code> should contain sufficient space to accomodate the returned response string.</p>
<p>This is a blocking function and will not return until either a response is received from the server, or an exception condition occurs.</p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">sock_fd</td><td>Socket descriptor returned from <a class="el" href="group__x52dcomm.html#ga59b382427afc417499311336747fb191">x52d_dial_command</a></td></tr>
<tr><td class="paramdir">[in,out]</td><td class="paramname">buffer</td><td>Pointer to the string containing the command and parameters. This is also used to save the returned response.</td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">buflen</td><td>Length of the buffer to hold the returned response.</td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>number of bytes returned from the server </dd>
<dd>
-1 on an error condition, and <code>errno</code> is set accordingly. </dd></dl>
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