<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/xhtml;charset=UTF-8"/> <meta http-equiv="X-UA-Compatible" content="IE=9"/> <meta name="generator" content="Doxygen 1.8.3.1"/> <title>BrlAPI: Connecting to BrlAPI</title> <link href="tabs.css" rel="stylesheet" type="text/css"/> <script type="text/javascript" src="jquery.js"></script> <script type="text/javascript" src="dynsections.js"></script> <link href="doxygen.css" rel="stylesheet" type="text/css" /> </head> <body> <div id="top"><!-- do not remove this div, it is closed by doxygen! --> <div id="titlearea"> <table cellspacing="0" cellpadding="0"> <tbody> <tr style="height: 56px;"> <td style="padding-left: 0.5em;"> <div id="projectname">BrlAPI  <span id="projectnumber">1.0</span> </div> </td> </tr> </tbody> </table> </div> <!-- end header part --> <!-- Generated by Doxygen 1.8.3.1 --> <div id="navrow1" class="tabs"> <ul class="tablist"> <li><a href="index.html"><span>Main Page</span></a></li> <li><a href="modules.html"><span>Modules</span></a></li> <li><a href="annotated.html"><span>Data Structures</span></a></li> <li><a href="files.html"><span>Files</span></a></li> </ul> </div> </div><!-- top --> <div class="header"> <div class="summary"> <a href="#nested-classes">Data Structures</a> | <a href="#define-members">Macros</a> | <a href="#typedef-members">Typedefs</a> | <a href="#func-members">Functions</a> </div> <div class="headertitle"> <div class="title">Connecting to BrlAPI</div> </div> </div><!--header--> <div class="contents"> <table class="memberdecls"> <tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="nested-classes"></a> Data Structures</h2></td></tr> <tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="structbrlapi__connectionSettings__t.html">brlapi_connectionSettings_t</a></td></tr> <tr class="memdesc:"><td class="mdescLeft"> </td><td class="mdescRight">Settings structure for <em>BrlAPI</em> connection. <a href="structbrlapi__connectionSettings__t.html#details">More...</a><br/></td></tr> <tr class="separator:"><td class="memSeparator" colspan="2"> </td></tr> </table><table class="memberdecls"> <tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="define-members"></a> Macros</h2></td></tr> <tr class="memitem:gabf6a76636febaac1c0251abb12d0935c"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group__brlapi__connection.html#gabf6a76636febaac1c0251abb12d0935c">BRLAPI_SOCKETPORTNUM</a>   4101</td></tr> <tr class="separator:gabf6a76636febaac1c0251abb12d0935c"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:ga4f5503ad782017b1e0b323b3ec8a331a"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group__brlapi__connection.html#ga4f5503ad782017b1e0b323b3ec8a331a">BRLAPI_SOCKETPORT</a>   "4101"</td></tr> <tr class="separator:ga4f5503ad782017b1e0b323b3ec8a331a"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:ga056c43c3de93b35970abf896e99a9893"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group__brlapi__connection.html#ga056c43c3de93b35970abf896e99a9893">BRLAPI_SOCKETPATH</a>   "/var/lib/BrlAPI"</td></tr> <tr class="separator:ga056c43c3de93b35970abf896e99a9893"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:ga0439f024cb826c67dbe16f7c66fa5a38"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group__brlapi__connection.html#ga0439f024cb826c67dbe16f7c66fa5a38">BRLAPI_ETCDIR</a>   "/etc"</td></tr> <tr class="separator:ga0439f024cb826c67dbe16f7c66fa5a38"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:ga6f87d526cda948b27ca7f503b97561ec"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group__brlapi__connection.html#ga6f87d526cda948b27ca7f503b97561ec">BRLAPI_AUTHKEYFILE</a>   "brlapi.key"</td></tr> <tr class="separator:ga6f87d526cda948b27ca7f503b97561ec"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:ga1b86dad4b4a50dc0875ab4c037812d5c"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group__brlapi__connection.html#ga1b86dad4b4a50dc0875ab4c037812d5c">BRLAPI_DEFAUTH</a>   <a class="el" href="group__brlapi__connection.html#ga0439f024cb826c67dbe16f7c66fa5a38">BRLAPI_ETCDIR</a> "/" <a class="el" href="group__brlapi__connection.html#ga6f87d526cda948b27ca7f503b97561ec">BRLAPI_AUTHKEYFILE</a></td></tr> <tr class="separator:ga1b86dad4b4a50dc0875ab4c037812d5c"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:ga45d2990108338f4764c4cabde1c3e759"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group__brlapi__connection.html#ga45d2990108338f4764c4cabde1c3e759">BRLAPI_SETTINGS_INITIALIZER</a>   { NULL, NULL }</td></tr> <tr class="separator:ga45d2990108338f4764c4cabde1c3e759"><td class="memSeparator" colspan="2"> </td></tr> </table><table class="memberdecls"> <tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="typedef-members"></a> Typedefs</h2></td></tr> <tr class="memitem:ga1273c1f34be592e19c9319e64becd1c0"><td class="memItemLeft" align="right" valign="top">typedef int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__brlapi__connection.html#ga1273c1f34be592e19c9319e64becd1c0">brlapi_fileDescriptor</a></td></tr> <tr class="separator:ga1273c1f34be592e19c9319e64becd1c0"><td class="memSeparator" colspan="2"> </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:gacd26dc42640bdad09a389be10b9e3618"><td class="memItemLeft" align="right" valign="top"><a class="el" href="group__brlapi__connection.html#ga1273c1f34be592e19c9319e64becd1c0">brlapi_fileDescriptor</a> <br class="typebreak"/> <a class="el" href="brlapi_8h.html#aaf61afab5ea0f7574217a09dba040428">BRLAPI_STDCALL</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__brlapi__connection.html#gacd26dc42640bdad09a389be10b9e3618">brlapi_openConnection</a> (const <a class="el" href="structbrlapi__connectionSettings__t.html">brlapi_connectionSettings_t</a> *desiredSettings, <a class="el" href="structbrlapi__connectionSettings__t.html">brlapi_connectionSettings_t</a> *actualSettings)</td></tr> <tr class="separator:gacd26dc42640bdad09a389be10b9e3618"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:gab72663955b05e29196285f945f55aa87"><td class="memItemLeft" align="right" valign="top"><a class="el" href="group__brlapi__connection.html#ga1273c1f34be592e19c9319e64becd1c0">brlapi_fileDescriptor</a> <br class="typebreak"/> <a class="el" href="brlapi_8h.html#aaf61afab5ea0f7574217a09dba040428">BRLAPI_STDCALL</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__brlapi__connection.html#gab72663955b05e29196285f945f55aa87">brlapi__openConnection</a> (<a class="el" href="group__brlapi__handles.html#ga57f2aec62b18f8aefea2ab550744b0c1">brlapi_handle_t</a> *handle, const <a class="el" href="structbrlapi__connectionSettings__t.html">brlapi_connectionSettings_t</a> *desiredSettings, <a class="el" href="structbrlapi__connectionSettings__t.html">brlapi_connectionSettings_t</a> *actualSettings)</td></tr> <tr class="separator:gab72663955b05e29196285f945f55aa87"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:ga7b2e32ae6b9dddaeea8f2365e37494cb"><td class="memItemLeft" align="right" valign="top">void <a class="el" href="brlapi_8h.html#aaf61afab5ea0f7574217a09dba040428">BRLAPI_STDCALL</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__brlapi__connection.html#ga7b2e32ae6b9dddaeea8f2365e37494cb">brlapi_closeConnection</a> (void)</td></tr> <tr class="separator:ga7b2e32ae6b9dddaeea8f2365e37494cb"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:ga8fb742c787203548522fc4d0f1edd041"><td class="memItemLeft" align="right" valign="top">void <a class="el" href="brlapi_8h.html#aaf61afab5ea0f7574217a09dba040428">BRLAPI_STDCALL</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__brlapi__connection.html#ga8fb742c787203548522fc4d0f1edd041">brlapi__closeConnection</a> (<a class="el" href="group__brlapi__handles.html#ga57f2aec62b18f8aefea2ab550744b0c1">brlapi_handle_t</a> *handle)</td></tr> <tr class="separator:ga8fb742c787203548522fc4d0f1edd041"><td class="memSeparator" colspan="2"> </td></tr> </table> <a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2> <p>Before calling any other function of the library, calling <a class="el" href="group__brlapi__connection.html#gacd26dc42640bdad09a389be10b9e3618">brlapi_openConnection()</a> is needed to establish a connection to <em>BrlAPI</em> 's server. When the connection is not needed any more, <a class="el" href="group__brlapi__connection.html#ga7b2e32ae6b9dddaeea8f2365e37494cb">brlapi_closeConnection()</a> must be called to close the connection. </p> <h2 class="groupheader">Macro Definition Documentation</h2> <a class="anchor" id="ga6f87d526cda948b27ca7f503b97561ec"></a> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname">#define BRLAPI_AUTHKEYFILE   "brlapi.key"</td> </tr> </table> </div><div class="memdoc"> <p>Default name of the file containing <em>BrlAPI</em> 's authorization key</p> <p>This name is relative to BRLAPI_ETCDIR </p> </div> </div> <a class="anchor" id="ga1b86dad4b4a50dc0875ab4c037812d5c"></a> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname">#define BRLAPI_DEFAUTH   <a class="el" href="group__brlapi__connection.html#ga0439f024cb826c67dbe16f7c66fa5a38">BRLAPI_ETCDIR</a> "/" <a class="el" href="group__brlapi__connection.html#ga6f87d526cda948b27ca7f503b97561ec">BRLAPI_AUTHKEYFILE</a></td> </tr> </table> </div><div class="memdoc"> <p>Default authorization setting </p> </div> </div> <a class="anchor" id="ga0439f024cb826c67dbe16f7c66fa5a38"></a> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname">#define BRLAPI_ETCDIR   "/etc"</td> </tr> </table> </div><div class="memdoc"> <p><em>brltty</em> 's settings directory</p> <p>This is where authorization key and driver-dependent key names are found for instance. </p> </div> </div> <a class="anchor" id="ga45d2990108338f4764c4cabde1c3e759"></a> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname">#define BRLAPI_SETTINGS_INITIALIZER   { NULL, NULL }</td> </tr> </table> </div><div class="memdoc"> <p>Allows to initialize a structure of type <em><a class="el" href="structbrlapi__connectionSettings__t.html" title="Settings structure for BrlAPI connection.">brlapi_connectionSettings_t</a></em> * with default values. </p> </div> </div> <a class="anchor" id="ga056c43c3de93b35970abf896e99a9893"></a> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname">#define BRLAPI_SOCKETPATH   "/var/lib/BrlAPI"</td> </tr> </table> </div><div class="memdoc"> <p>Default unix path on which connections to <em>BrlAPI</em> can be established </p> </div> </div> <a class="anchor" id="ga4f5503ad782017b1e0b323b3ec8a331a"></a> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname">#define BRLAPI_SOCKETPORT   "4101"</td> </tr> </table> </div><div class="memdoc"> </div> </div> <a class="anchor" id="gabf6a76636febaac1c0251abb12d0935c"></a> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname">#define BRLAPI_SOCKETPORTNUM   4101</td> </tr> </table> </div><div class="memdoc"> <p>Default port number on which connections to <em>BrlAPI</em> can be established </p> </div> </div> <h2 class="groupheader">Typedef Documentation</h2> <a class="anchor" id="ga1273c1f34be592e19c9319e64becd1c0"></a> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname">typedef int <a class="el" href="group__brlapi__connection.html#ga1273c1f34be592e19c9319e64becd1c0">brlapi_fileDescriptor</a></td> </tr> </table> </div><div class="memdoc"> </div> </div> <h2 class="groupheader">Function Documentation</h2> <a class="anchor" id="ga8fb742c787203548522fc4d0f1edd041"></a> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname">void <a class="el" href="brlapi_8h.html#aaf61afab5ea0f7574217a09dba040428">BRLAPI_STDCALL</a> brlapi__closeConnection </td> <td>(</td> <td class="paramtype"><a class="el" href="group__brlapi__handles.html#ga57f2aec62b18f8aefea2ab550744b0c1">brlapi_handle_t</a> * </td> <td class="paramname"><em>handle</em></td><td>)</td> <td></td> </tr> </table> </div><div class="memdoc"> </div> </div> <a class="anchor" id="gab72663955b05e29196285f945f55aa87"></a> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname"><a class="el" href="group__brlapi__connection.html#ga1273c1f34be592e19c9319e64becd1c0">brlapi_fileDescriptor</a> <a class="el" href="brlapi_8h.html#aaf61afab5ea0f7574217a09dba040428">BRLAPI_STDCALL</a> brlapi__openConnection </td> <td>(</td> <td class="paramtype"><a class="el" href="group__brlapi__handles.html#ga57f2aec62b18f8aefea2ab550744b0c1">brlapi_handle_t</a> * </td> <td class="paramname"><em>handle</em>, </td> </tr> <tr> <td class="paramkey"></td> <td></td> <td class="paramtype">const <a class="el" href="structbrlapi__connectionSettings__t.html">brlapi_connectionSettings_t</a> * </td> <td class="paramname"><em>desiredSettings</em>, </td> </tr> <tr> <td class="paramkey"></td> <td></td> <td class="paramtype"><a class="el" href="structbrlapi__connectionSettings__t.html">brlapi_connectionSettings_t</a> * </td> <td class="paramname"><em>actualSettings</em> </td> </tr> <tr> <td></td> <td>)</td> <td></td><td></td> </tr> </table> </div><div class="memdoc"> </div> </div> <a class="anchor" id="ga7b2e32ae6b9dddaeea8f2365e37494cb"></a> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname">void <a class="el" href="brlapi_8h.html#aaf61afab5ea0f7574217a09dba040428">BRLAPI_STDCALL</a> brlapi_closeConnection </td> <td>(</td> <td class="paramtype">void </td> <td class="paramname"></td><td>)</td> <td></td> </tr> </table> </div><div class="memdoc"> <p>Cleanly close the socket</p> <p>This function locks until a closing acknowledgement is received from the server. The socket is then freed, so the file descriptor <a class="el" href="group__brlapi__connection.html#gacd26dc42640bdad09a389be10b9e3618">brlapi_openConnection()</a> gave has no meaning any more </p> </div> </div> <a class="anchor" id="gacd26dc42640bdad09a389be10b9e3618"></a> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname"><a class="el" href="group__brlapi__connection.html#ga1273c1f34be592e19c9319e64becd1c0">brlapi_fileDescriptor</a> <a class="el" href="brlapi_8h.html#aaf61afab5ea0f7574217a09dba040428">BRLAPI_STDCALL</a> brlapi_openConnection </td> <td>(</td> <td class="paramtype">const <a class="el" href="structbrlapi__connectionSettings__t.html">brlapi_connectionSettings_t</a> * </td> <td class="paramname"><em>desiredSettings</em>, </td> </tr> <tr> <td class="paramkey"></td> <td></td> <td class="paramtype"><a class="el" href="structbrlapi__connectionSettings__t.html">brlapi_connectionSettings_t</a> * </td> <td class="paramname"><em>actualSettings</em> </td> </tr> <tr> <td></td> <td>)</td> <td></td><td></td> </tr> </table> </div><div class="memdoc"> <p>Open a socket and connect it to <em>BrlAPI</em> 's server</p> <p>This function first loads an authorization key as specified in settings. It then creates a TCP socket and connects it to the specified machine, on the specified port. It writes the authorization key on the socket and waits for acknowledgement.</p> <dl class="section return"><dt>Returns</dt><dd>the file descriptor, or -1 on error</dd></dl> <dl class="section note"><dt>Note</dt><dd>The file descriptor is returned in case the client wants to communicate with the server without using <em>libbrlapi</em> functions. If it uses them however, it won't have to pass the file descriptor later, since the library keeps a copy of it. But that also means that <a class="el" href="group__brlapi__connection.html#gacd26dc42640bdad09a389be10b9e3618">brlapi_openConnection()</a> may be called several times, but <em>libbrlapi</em> functions will always work with the last call's descriptor</dd></dl> <dl class="section user"><dt>Example:</dt><dd><div class="fragment"><div class="line"><span class="keywordflow">if</span> (<a class="code" href="group__brlapi__connection.html#gacd26dc42640bdad09a389be10b9e3618">brlapi_openConnection</a>(&settings,&settings)<0) {</div> <div class="line"> fprintf(stderr,<span class="stringliteral">"couldn't connect to BrlAPI at %s: %s\n"</span>,</div> <div class="line"> settings.host, <a class="code" href="group__brlapi__error.html#ga04c3125a4b0f5af895728f36b3852a27">brlapi_strerror</a>(&<a class="code" href="group__brlapi__error.html#ga93ee012430dc5ca8563404a483cc9610">brlapi_error</a>));</div> <div class="line"> exit(1);</div> <div class="line">}</div> </div><!-- fragment --></dd></dl> <dl class="section user"><dt>Errors:</dt><dd><em>BrlAPI</em> might not be on this TCP port, the host name might not be resolvable, the authorization may fail,...</dd></dl> <dl class="params"><dt>Parameters</dt><dd> <table class="params"> <tr><td class="paramname">desiredSettings</td><td>this gives the desired connection parameters, as described in <a class="el" href="structbrlapi__connectionSettings__t.html" title="Settings structure for BrlAPI connection.">brlapi_connectionSettings_t</a>. If <code>NULL</code>, defaults values are used, so that it is generally a good idea to give <code>NULL</code> as default, and only fill a <a class="el" href="structbrlapi__connectionSettings__t.html" title="Settings structure for BrlAPI connection.">brlapi_connectionSettings_t</a> structure when the user gave parameters to the program for instance; </td></tr> <tr><td class="paramname">actualSettings</td><td>if not <code>NULL</code>, parameters which were actually used are stored here, if the application ever needs them.</td></tr> </table> </dd> </dl> <dl class="section see"><dt>See Also</dt><dd><a class="el" href="structbrlapi__connectionSettings__t.html" title="Settings structure for BrlAPI connection.">brlapi_connectionSettings_t</a> <a class="el" href="group__brlapi__protocol.html#gabc8a0c3fe653b8d44059aee810c5b35a">brlapi_writePacket()</a> <a class="el" href="group__brlapi__protocol.html#ga3fa149ae4b0f1adcf8f514ebc9a1f45f">brlapi_readPacketHeader()</a> <a class="el" href="group__brlapi__protocol.html#ga6a963be14210e5706f16b57a2f388e6e">brlapi_readPacketContent()</a> <a class="el" href="group__brlapi__protocol.html#ga593411f2c9306ff774eb854f78eaa18b">brlapi_readPacket()</a> </dd></dl> </div> </div> </div><!-- contents --> <!-- start footer part --> <hr class="footer"/><address class="footer"><small> Generated by  <a href="http://www.doxygen.org/index.html"> <img class="footer" src="doxygen.png" alt="doxygen"/> </a> 1.8.3.1 </small></address> </body> </html>