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<div class="header">
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<a href="#define-members">Macros</a> |
<a href="#func-members">Functions</a> </div>
<div class="headertitle"><div class="title">Entering & leaving tty mode</div></div>
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<p>How to take control of ttys for direct braille display / read.
<a href="#details">More...</a></p>
<table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a id="define-members" name="define-members"></a>
Macros</h2></td></tr>
<tr class="memitem:gae0b2c127d52bada693a0e87a0ba42cda" id="r_gae0b2c127d52bada693a0e87a0ba42cda"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="#gae0b2c127d52bada693a0e87a0ba42cda">BRLAPI_TTY_DEFAULT</a>   -1</td></tr>
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a id="func-members" name="func-members"></a>
Functions</h2></td></tr>
<tr class="memitem:ga6d8ae822fa87d9bfb1fb15ecf2bbcaac" id="r_ga6d8ae822fa87d9bfb1fb15ecf2bbcaac"><td class="memItemLeft" align="right" valign="top">int <a class="el" href="brlapi_8h.html#aaf61afab5ea0f7574217a09dba040428">BRLAPI_STDCALL</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#ga6d8ae822fa87d9bfb1fb15ecf2bbcaac">brlapi_enterTtyMode</a> (int tty, const char *driver)</td></tr>
<tr class="separator:ga6d8ae822fa87d9bfb1fb15ecf2bbcaac"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga756e26827f24055afb1716cb6bc00d14" id="r_ga756e26827f24055afb1716cb6bc00d14"><td class="memItemLeft" align="right" valign="top">int <a class="el" href="brlapi_8h.html#aaf61afab5ea0f7574217a09dba040428">BRLAPI_STDCALL</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#ga756e26827f24055afb1716cb6bc00d14">brlapi__enterTtyMode</a> (<a class="el" href="group__brlapi__handles.html#ga57f2aec62b18f8aefea2ab550744b0c1">brlapi_handle_t</a> *handle, int tty, const char *driver)</td></tr>
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<tr class="memitem:ga0e15d9c92fc6b15ef5cbc9087664eeca" id="r_ga0e15d9c92fc6b15ef5cbc9087664eeca"><td class="memItemLeft" align="right" valign="top">int <a class="el" href="brlapi_8h.html#aaf61afab5ea0f7574217a09dba040428">BRLAPI_STDCALL</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#ga0e15d9c92fc6b15ef5cbc9087664eeca">brlapi_enterTtyModeWithPath</a> (const int *ttys, int count, const char *driver)</td></tr>
<tr class="separator:ga0e15d9c92fc6b15ef5cbc9087664eeca"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:gaf9ebb3e235e893a6cb369069cfe4824e" id="r_gaf9ebb3e235e893a6cb369069cfe4824e"><td class="memItemLeft" align="right" valign="top">int <a class="el" href="brlapi_8h.html#aaf61afab5ea0f7574217a09dba040428">BRLAPI_STDCALL</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#gaf9ebb3e235e893a6cb369069cfe4824e">brlapi__enterTtyModeWithPath</a> (<a class="el" href="group__brlapi__handles.html#ga57f2aec62b18f8aefea2ab550744b0c1">brlapi_handle_t</a> *handle, const int *ttys, int count, const char *driver)</td></tr>
<tr class="separator:gaf9ebb3e235e893a6cb369069cfe4824e"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga681f2c7f09e33a32a2731e4e77ce7cec" id="r_ga681f2c7f09e33a32a2731e4e77ce7cec"><td class="memItemLeft" align="right" valign="top">int <a class="el" href="brlapi_8h.html#aaf61afab5ea0f7574217a09dba040428">BRLAPI_STDCALL</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#ga681f2c7f09e33a32a2731e4e77ce7cec">brlapi_leaveTtyMode</a> (void)</td></tr>
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<tr class="memitem:gab9d34785c372717f567234ecae78809d" id="r_gab9d34785c372717f567234ecae78809d"><td class="memItemLeft" align="right" valign="top">int <a class="el" href="brlapi_8h.html#aaf61afab5ea0f7574217a09dba040428">BRLAPI_STDCALL</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#gab9d34785c372717f567234ecae78809d">brlapi__leaveTtyMode</a> (<a class="el" href="group__brlapi__handles.html#ga57f2aec62b18f8aefea2ab550744b0c1">brlapi_handle_t</a> *handle)</td></tr>
<tr class="separator:gab9d34785c372717f567234ecae78809d"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga404a4af6b41cdacfb33fbbb09c1ce961" id="r_ga404a4af6b41cdacfb33fbbb09c1ce961"><td class="memItemLeft" align="right" valign="top">int <a class="el" href="brlapi_8h.html#aaf61afab5ea0f7574217a09dba040428">BRLAPI_STDCALL</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#ga404a4af6b41cdacfb33fbbb09c1ce961">brlapi_setFocus</a> (int tty)</td></tr>
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<tr class="memitem:gad02a955f6bb02723e907f93cbef2616b" id="r_gad02a955f6bb02723e907f93cbef2616b"><td class="memItemLeft" align="right" valign="top">int <a class="el" href="brlapi_8h.html#aaf61afab5ea0f7574217a09dba040428">BRLAPI_STDCALL</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#gad02a955f6bb02723e907f93cbef2616b">brlapi__setFocus</a> (<a class="el" href="group__brlapi__handles.html#ga57f2aec62b18f8aefea2ab550744b0c1">brlapi_handle_t</a> *handle, int tty)</td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<p>Before being able to write on the braille display, the application must tell the server which tty it will handle.</p>
<p>The application must also specify how braille keys will be delivered to it. Two ways are possible:</p>
<ul>
<li>driver-specific keycodes: applications will get values specific to each braille driver, since the keycode, as defined in the driver will be given for each key event (press or release). Using them leads to building highly driver-dependent applications, which can yet sometimes be useful to mimic existing proprietary applications for instance.</li>
<li>commands: applications will get exactly the same values as <em>brltty</em>. This allows driver-independent clients, which will hopefully be nice to use with a lot of different terminals. <dl class="section see"><dt>See also</dt><dd><a class="el" href="group__brlapi__keys.html#ga3b5ba0c43d48792e7071e772b50b9cbe">brlapi_readKey()</a> </dd></dl>
</li>
</ul>
<h2 class="groupheader">Macro Definition Documentation</h2>
<a id="gae0b2c127d52bada693a0e87a0ba42cda" name="gae0b2c127d52bada693a0e87a0ba42cda"></a>
<h2 class="memtitle"><span class="permalink"><a href="#gae0b2c127d52bada693a0e87a0ba42cda">◆ </a></span>BRLAPI_TTY_DEFAULT</h2>
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<td class="memname">#define BRLAPI_TTY_DEFAULT   -1</td>
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<p>Select the default tty.</p>
<p>The library takes the following steps:</p><ol type="1">
<li>Try to get the tty number from the <code>WINDOWID</code> environment variable (for the <code>xterm</code> case).</li>
<li>Try to get the tty number from the <code>CONTROLVT</code> environment variable.</li>
<li>Read <code>/proc/self/stat</code> (on <code>Linux</code>).</li>
</ol>
<dl class="section see"><dt>See also</dt><dd><a class="el" href="#ga6d8ae822fa87d9bfb1fb15ecf2bbcaac">brlapi_enterTtyMode()</a> </dd></dl>
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</div>
<h2 class="groupheader">Function Documentation</h2>
<a id="ga756e26827f24055afb1716cb6bc00d14" name="ga756e26827f24055afb1716cb6bc00d14"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ga756e26827f24055afb1716cb6bc00d14">◆ </a></span>brlapi__enterTtyMode()</h2>
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<td class="memname">int <a class="el" href="brlapi_8h.html#aaf61afab5ea0f7574217a09dba040428">BRLAPI_STDCALL</a> brlapi__enterTtyMode </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group__brlapi__handles.html#ga57f2aec62b18f8aefea2ab550744b0c1">brlapi_handle_t</a> *</td> <td class="paramname"><span class="paramname"><em>handle</em></span>, </td>
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<td class="paramtype">int</td> <td class="paramname"><span class="paramname"><em>tty</em></span>, </td>
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<td class="paramtype">const char *</td> <td class="paramname"><span class="paramname"><em>driver</em></span> )</td>
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<h2 class="memtitle"><span class="permalink"><a href="#gaf9ebb3e235e893a6cb369069cfe4824e">◆ </a></span>brlapi__enterTtyModeWithPath()</h2>
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<td class="memname">int <a class="el" href="brlapi_8h.html#aaf61afab5ea0f7574217a09dba040428">BRLAPI_STDCALL</a> brlapi__enterTtyModeWithPath </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group__brlapi__handles.html#ga57f2aec62b18f8aefea2ab550744b0c1">brlapi_handle_t</a> *</td> <td class="paramname"><span class="paramname"><em>handle</em></span>, </td>
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<td class="paramkey"></td>
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<td class="paramtype">const int *</td> <td class="paramname"><span class="paramname"><em>ttys</em></span>, </td>
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<td class="paramtype">int</td> <td class="paramname"><span class="paramname"><em>count</em></span>, </td>
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<td class="paramtype">const char *</td> <td class="paramname"><span class="paramname"><em>driver</em></span> )</td>
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<a id="gab9d34785c372717f567234ecae78809d" name="gab9d34785c372717f567234ecae78809d"></a>
<h2 class="memtitle"><span class="permalink"><a href="#gab9d34785c372717f567234ecae78809d">◆ </a></span>brlapi__leaveTtyMode()</h2>
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<td class="memname">int <a class="el" href="brlapi_8h.html#aaf61afab5ea0f7574217a09dba040428">BRLAPI_STDCALL</a> brlapi__leaveTtyMode </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group__brlapi__handles.html#ga57f2aec62b18f8aefea2ab550744b0c1">brlapi_handle_t</a> *</td> <td class="paramname"><span class="paramname"><em>handle</em></span></td><td>)</td>
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<h2 class="memtitle"><span class="permalink"><a href="#gad02a955f6bb02723e907f93cbef2616b">◆ </a></span>brlapi__setFocus()</h2>
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<td class="memname">int <a class="el" href="brlapi_8h.html#aaf61afab5ea0f7574217a09dba040428">BRLAPI_STDCALL</a> brlapi__setFocus </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group__brlapi__handles.html#ga57f2aec62b18f8aefea2ab550744b0c1">brlapi_handle_t</a> *</td> <td class="paramname"><span class="paramname"><em>handle</em></span>, </td>
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<td class="paramtype">int</td> <td class="paramname"><span class="paramname"><em>tty</em></span> )</td>
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<h2 class="memtitle"><span class="permalink"><a href="#ga6d8ae822fa87d9bfb1fb15ecf2bbcaac">◆ </a></span>brlapi_enterTtyMode()</h2>
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<td class="memname">int <a class="el" href="brlapi_8h.html#aaf61afab5ea0f7574217a09dba040428">BRLAPI_STDCALL</a> brlapi_enterTtyMode </td>
<td>(</td>
<td class="paramtype">int</td> <td class="paramname"><span class="paramname"><em>tty</em></span>, </td>
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<p>Ask for some tty, with some key mechanism</p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">tty</td><td><ul>
<li>If tty>=0 then take control of the specified tty.</li>
<li>If tty==<a class="el" href="#gae0b2c127d52bada693a0e87a0ba42cda">BRLAPI_TTY_DEFAULT</a> then take control of the default tty.</li>
</ul>
</td></tr>
<tr><td class="paramname">driver</td><td>tells how the application wants <a class="el" href="group__brlapi__keys.html#ga3b5ba0c43d48792e7071e772b50b9cbe">brlapi_readKey()</a> to return key presses. NULL or "" means BRLTTY commands are required, whereas a driver name means that driver-specific keycodes are expected.</td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>the used tty number on success, -1 on error</dd></dl>
<p>WINDOWPATH and WINDOWID should be propagated when running remote applications via ssh, for instance, along with BRLAPI_HOST and the authorization key (see SendEnv in ssh_config(5) and AcceptEnv in sshd_config(5))</p>
<p>Once <a class="el" href="#ga6d8ae822fa87d9bfb1fb15ecf2bbcaac">brlapi_enterTtyMode()</a> is called, <a class="el" href="#ga681f2c7f09e33a32a2731e4e77ce7cec">brlapi_leaveTtyMode()</a> has to be called before calling <a class="el" href="#ga6d8ae822fa87d9bfb1fb15ecf2bbcaac">brlapi_enterTtyMode()</a> again.</p>
<p>If the application does not want to take control of a particular tty, but keep control on all ttys, brlapi_enterTtyModeWithPath should be called instead with nttys equal to 0. This is usually what a screen reader wants to use.</p>
<p>TODO: document which functions work in TTY mode only.</p>
<dl class="section see"><dt>See also</dt><dd><a class="el" href="#ga681f2c7f09e33a32a2731e4e77ce7cec">brlapi_leaveTtyMode()</a> <a class="el" href="group__brlapi__keys.html#ga3b5ba0c43d48792e7071e772b50b9cbe">brlapi_readKey()</a> </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#ga0e15d9c92fc6b15ef5cbc9087664eeca">◆ </a></span>brlapi_enterTtyModeWithPath()</h2>
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<td class="memname">int <a class="el" href="brlapi_8h.html#aaf61afab5ea0f7574217a09dba040428">BRLAPI_STDCALL</a> brlapi_enterTtyModeWithPath </td>
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<td class="paramtype">const int *</td> <td class="paramname"><span class="paramname"><em>ttys</em></span>, </td>
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<p>Ask for some tty specified by its path in the tty tree, with some key mechanism</p>
<dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramname">ttys</td><td>points on the array of ttys representing the tty path to be got. Can be NULL if nttys is 0. </td></tr>
<tr><td class="paramname">count</td><td>gives the number of elements in ttys. </td></tr>
<tr><td class="paramname">driver</td><td>has the same meaning as in <a class="el" href="#ga6d8ae822fa87d9bfb1fb15ecf2bbcaac">brlapi_enterTtyMode()</a></td></tr>
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<p>Providing nttys == 0 means to get the root, which is usually what a screen readers wants to use.</p>
<p>The content of WINDOWPATH or XDG_VTNR will always be prepended to the given <code>ttys</code> array, so the application does not need to determine by itself where it is running.</p>
<dl class="section return"><dt>Returns</dt><dd>0 on success, -1 on error.</dd></dl>
<dl class="section see"><dt>See also</dt><dd><a class="el" href="#ga6d8ae822fa87d9bfb1fb15ecf2bbcaac">brlapi_enterTtyMode()</a> </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#ga681f2c7f09e33a32a2731e4e77ce7cec">◆ </a></span>brlapi_leaveTtyMode()</h2>
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<td class="memname">int <a class="el" href="brlapi_8h.html#aaf61afab5ea0f7574217a09dba040428">BRLAPI_STDCALL</a> brlapi_leaveTtyMode </td>
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<td class="paramtype">void</td> <td class="paramname"><span class="paramname"><em></em></span></td><td>)</td>
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<p>Stop controlling the tty</p>
<dl class="section return"><dt>Returns</dt><dd>0 on success, -1 on error.</dd></dl>
<dl class="section see"><dt>See also</dt><dd><a class="el" href="#ga6d8ae822fa87d9bfb1fb15ecf2bbcaac">brlapi_enterTtyMode()</a> </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#ga404a4af6b41cdacfb33fbbb09c1ce961">◆ </a></span>brlapi_setFocus()</h2>
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<td class="memname">int <a class="el" href="brlapi_8h.html#aaf61afab5ea0f7574217a09dba040428">BRLAPI_STDCALL</a> brlapi_setFocus </td>
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<td class="paramtype">int</td> <td class="paramname"><span class="paramname"><em>tty</em></span></td><td>)</td>
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<p>Tell the current tty to brltty</p>
<p>This is intended for focus tellers, such as brltty, xbrlapi, screen, ... <a class="el" href="#ga6d8ae822fa87d9bfb1fb15ecf2bbcaac">brlapi_enterTtyMode()</a> must have been called beforehand to tell where this focus applies in the tty tree.</p>
<dl class="section return"><dt>Returns</dt><dd>0 on success, -1 on error.</dd></dl>
<dl class="section see"><dt>See also</dt><dd><a class="el" href="#ga6d8ae822fa87d9bfb1fb15ecf2bbcaac">brlapi_enterTtyMode()</a> <a class="el" href="#ga681f2c7f09e33a32a2731e4e77ce7cec">brlapi_leaveTtyMode()</a> </dd></dl>
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