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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="#typedef-members">Typedefs</a> &#124;
<a href="#func-members">Functions</a> </div>
<div class="headertitle">
<div class="title">Daemon communication</div> </div>
</div><!--header-->
<div class="contents">
<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="typedef-members"></a>
Typedefs</h2></td></tr>
<tr class="memitem:ga9a817265ac0e43fb191efe3347922df8"><td class="memItemLeft" align="right" valign="top"><a id="ga9a817265ac0e43fb191efe3347922df8"></a>
typedef int(*&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__x52dcomm.html#ga9a817265ac0e43fb191efe3347922df8">x52d_notify_callback_fn</a>) (int argc, char **argv)</td></tr>
<tr class="memdesc:ga9a817265ac0e43fb191efe3347922df8"><td class="mdescLeft">&#160;</td><td class="mdescRight">Notification callback function type. <br /></td></tr>
<tr class="separator:ga9a817265ac0e43fb191efe3347922df8"><td class="memSeparator" colspan="2">&#160;</td></tr>
</table><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 command socket. <a href="group__x52dcomm.html#ga59b382427afc417499311336747fb191">More...</a><br /></td></tr>
<tr class="separator:ga59b382427afc417499311336747fb191"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:gadfb485d611919a9a5a6dea019794f0e8"><td class="memItemLeft" align="right" valign="top">int&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__x52dcomm.html#gadfb485d611919a9a5a6dea019794f0e8">x52d_dial_notify</a> (const char *sock_path)</td></tr>
<tr class="memdesc:gadfb485d611919a9a5a6dea019794f0e8"><td class="mdescLeft">&#160;</td><td class="mdescRight">Open a connection to the daemon notify socket. <a href="group__x52dcomm.html#gadfb485d611919a9a5a6dea019794f0e8">More...</a><br /></td></tr>
<tr class="separator:gadfb485d611919a9a5a6dea019794f0e8"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:ga667ce343cc456bcb63221258bc35ad4e"><td class="memItemLeft" align="right" valign="top">int&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__x52dcomm.html#ga667ce343cc456bcb63221258bc35ad4e">x52d_format_command</a> (int argc, const char **argv, char *buffer, size_t buflen)</td></tr>
<tr class="memdesc:ga667ce343cc456bcb63221258bc35ad4e"><td class="mdescLeft">&#160;</td><td class="mdescRight">Format a series of command strings into a buffer. <a href="group__x52dcomm.html#ga667ce343cc456bcb63221258bc35ad4e">More...</a><br /></td></tr>
<tr class="separator:ga667ce343cc456bcb63221258bc35ad4e"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:gaef9b481c4e5faaac14e2681cb64c3faa"><td class="memItemLeft" align="right" valign="top">int&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__x52dcomm.html#gaef9b481c4e5faaac14e2681cb64c3faa">x52d_send_command</a> (int sock_fd, char *buffer, size_t bufin, size_t bufout)</td></tr>
<tr class="memdesc:gaef9b481c4e5faaac14e2681cb64c3faa"><td class="mdescLeft">&#160;</td><td class="mdescRight">Send a command to the daemon and retrieve the response. <a href="group__x52dcomm.html#gaef9b481c4e5faaac14e2681cb64c3faa">More...</a><br /></td></tr>
<tr class="separator:gaef9b481c4e5faaac14e2681cb64c3faa"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:ga0494e9f6fa20d568878f893f3474ed1c"><td class="memItemLeft" align="right" valign="top">int&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__x52dcomm.html#ga0494e9f6fa20d568878f893f3474ed1c">x52d_recv_notification</a> (int sock_fd, <a class="el" href="group__x52dcomm.html#ga9a817265ac0e43fb191efe3347922df8">x52d_notify_callback_fn</a> callback)</td></tr>
<tr class="memdesc:ga0494e9f6fa20d568878f893f3474ed1c"><td class="mdescLeft">&#160;</td><td class="mdescRight">Receive a notification from the daemon. <a href="group__x52dcomm.html#ga0494e9f6fa20d568878f893f3474ed1c">More...</a><br /></td></tr>
<tr class="separator:ga0494e9f6fa20d568878f893f3474ed1c"><td class="memSeparator" colspan="2">&#160;</td></tr>
</table>
<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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<div class="memproto">
<table class="memname">
<tr>
<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>
</table>
</div><div class="memdoc">
<p>Open a connection to the daemon command socket. </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#gaef9b481c4e5faaac14e2681cb64c3faa">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>
</div>
</div>
<a id="gadfb485d611919a9a5a6dea019794f0e8"></a>
<h2 class="memtitle"><span class="permalink"><a href="#gadfb485d611919a9a5a6dea019794f0e8">&#9670;&nbsp;</a></span>x52d_dial_notify()</h2>
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<div class="memproto">
<table class="memname">
<tr>
<td class="memname">int x52d_dial_notify </td>
<td>(</td>
<td class="paramtype">const char *&#160;</td>
<td class="paramname"><em>sock_path</em></td><td>)</td>
<td></td>
</tr>
</table>
</div><div class="memdoc">
<p>Open a connection to the daemon notify socket. </p>
<p>This method opens a socket connection to the daemon notify socket. This socket allows the client to receive notifications from the daemon. Thej <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#ga0494e9f6fa20d568878f893f3474ed1c">x52d_recv_notification</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>
</div>
</div>
<a id="ga667ce343cc456bcb63221258bc35ad4e"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ga667ce343cc456bcb63221258bc35ad4e">&#9670;&nbsp;</a></span>x52d_format_command()</h2>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">int x52d_format_command </td>
<td>(</td>
<td class="paramtype">int&#160;</td>
<td class="paramname"><em>argc</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const char **&#160;</td>
<td class="paramname"><em>argv</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">char *&#160;</td>
<td class="paramname"><em>buffer</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">size_t&#160;</td>
<td class="paramname"><em>buflen</em>&#160;</td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
</table>
</div><div class="memdoc">
<p>Format a series of command strings into a buffer. </p>
<p>The client sends the command and parameters as a series of NUL terminated strings. This function concatenates the commands into a single buffer that can be passed to <a class="el" href="group__x52dcomm.html#gaef9b481c4e5faaac14e2681cb64c3faa">x52d_send_command</a>.</p>
<p><code>buffer</code> should be at least 1024 bytes long.</p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">argc</td><td>Number of arguments to fit in the buffer </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">argv</td><td>Pointer to an array of arguments. </td></tr>
<tr><td class="paramdir">[out]</td><td class="paramname">buffer</td><td>Buffer to store the formatted command </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">buflen</td><td>Length of the buffer</td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>number of bytes in the formatted command </dd>
<dd>
-1 on an error condition, and <code>errno</code> is set accordingly. </dd></dl>
</div>
</div>
<a id="ga0494e9f6fa20d568878f893f3474ed1c"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ga0494e9f6fa20d568878f893f3474ed1c">&#9670;&nbsp;</a></span>x52d_recv_notification()</h2>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">int x52d_recv_notification </td>
<td>(</td>
<td class="paramtype">int&#160;</td>
<td class="paramname"><em>sock_fd</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="group__x52dcomm.html#ga9a817265ac0e43fb191efe3347922df8">x52d_notify_callback_fn</a>&#160;</td>
<td class="paramname"><em>callback</em>&#160;</td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
</table>
</div><div class="memdoc">
<p>Receive a notification from the daemon. </p>
<p>This function blocks until it receives a notification from the daemon. Once it receives a notification successfully, it will call the callback function with the arguments as string pointers. It will return the return value of the callback function, if it was called.</p>
<p>This is a blocking function and will not return until either a notification 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#gadfb485d611919a9a5a6dea019794f0e8">x52d_dial_notify</a></td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">callback</td><td>Pointer to the callback function</td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>return code of the callback function on success </dd>
<dd>
-1 on an error condition, and <code>errno</code> is set accordingly. </dd></dl>
</div>
</div>
<a id="gaef9b481c4e5faaac14e2681cb64c3faa"></a>
<h2 class="memtitle"><span class="permalink"><a href="#gaef9b481c4e5faaac14e2681cb64c3faa">&#9670;&nbsp;</a></span>x52d_send_command()</h2>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<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>
<td></td>
<td class="paramtype">char *&#160;</td>
<td class="paramname"><em>buffer</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">size_t&#160;</td>
<td class="paramname"><em>bufin</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">size_t&#160;</td>
<td class="paramname"><em>bufout</em>&#160;</td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
</table>
</div><div class="memdoc">
<p>Send a command to the daemon and retrieve the response. </p>
<p>The client sends the command and parameters as a series of NUL terminated strings, 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">bufin</td><td>Length of the command in the input buffer </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">bufout</td><td>Maximum length of the 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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