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<a href="#typedef-members">Typedefs</a> |
<a href="#enum-members">Enumerations</a> |
<a href="#func-members">Functions</a> </div>
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<div class="title">Library logging facilities</div> </div>
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<p>libevdev provides two methods of logging library-internal messages.
<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:gaadd55a5932c7472fa3fbc95332d29418"><td class="memItemLeft" align="right" valign="top">typedef void(* </td><td class="memItemRight" valign="bottom"><a class="el" href="group__logging.html#gaadd55a5932c7472fa3fbc95332d29418">libevdev_log_func_t</a>) (enum <a class="el" href="group__logging.html#ga0b798d0864f2b1b10e4603f9431b3364">libevdev_log_priority</a> priority, void *data, const char *file, int line, const char *func, const char *format, va_list args) <a class="el" href="libevdev_8h.html#a64a0f325e88e1be50eb806e1ff75aec8">LIBEVDEV_ATTRIBUTE_PRINTF</a>(6</td></tr>
<tr class="memdesc:gaadd55a5932c7472fa3fbc95332d29418"><td class="mdescLeft"> </td><td class="mdescRight">Logging function called by library-internal logging. <a href="#gaadd55a5932c7472fa3fbc95332d29418">More...</a><br /></td></tr>
<tr class="separator:gaadd55a5932c7472fa3fbc95332d29418"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga14b506281a64b81f6dd740fb43b1faaa"><td class="memItemLeft" align="right" valign="top">typedef void(*) voi </td><td class="memItemRight" valign="bottom"><a class="el" href="group__logging.html#ga14b506281a64b81f6dd740fb43b1faaa">libevdev_set_log_function</a>) (<a class="el" href="group__logging.html#gaadd55a5932c7472fa3fbc95332d29418">libevdev_log_func_t</a> logfunc, void *data)</td></tr>
<tr class="memdesc:ga14b506281a64b81f6dd740fb43b1faaa"><td class="mdescLeft"> </td><td class="mdescRight">Set a printf-style logging handler for library-internal logging. <a href="#ga14b506281a64b81f6dd740fb43b1faaa">More...</a><br /></td></tr>
<tr class="separator:ga14b506281a64b81f6dd740fb43b1faaa"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga3bd32116aca4e7d1cfd741bf35a6e5ee"><td class="memItemLeft" align="right" valign="top">typedef void(* </td><td class="memItemRight" valign="bottom"><a class="el" href="group__logging.html#ga3bd32116aca4e7d1cfd741bf35a6e5ee">libevdev_device_log_func_t</a>) (const struct libevdev *dev, enum <a class="el" href="group__logging.html#ga0b798d0864f2b1b10e4603f9431b3364">libevdev_log_priority</a> priority, void *data, const char *file, int line, const char *func, const char *format, va_list args) <a class="el" href="libevdev_8h.html#a64a0f325e88e1be50eb806e1ff75aec8">LIBEVDEV_ATTRIBUTE_PRINTF</a>(7</td></tr>
<tr class="memdesc:ga3bd32116aca4e7d1cfd741bf35a6e5ee"><td class="mdescLeft"> </td><td class="mdescRight">Logging function called by library-internal logging for a specific libevdev context. <a href="#ga3bd32116aca4e7d1cfd741bf35a6e5ee">More...</a><br /></td></tr>
<tr class="separator:ga3bd32116aca4e7d1cfd741bf35a6e5ee"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:gaaee377cefdb5b19e55604173e68398b5"><td class="memItemLeft" align="right" valign="top">typedef void(*) voi </td><td class="memItemRight" valign="bottom"><a class="el" href="group__logging.html#gaaee377cefdb5b19e55604173e68398b5">libevdev_set_device_log_function</a>) (struct libevdev *dev, <a class="el" href="group__logging.html#ga3bd32116aca4e7d1cfd741bf35a6e5ee">libevdev_device_log_func_t</a> logfunc, enum <a class="el" href="group__logging.html#ga0b798d0864f2b1b10e4603f9431b3364">libevdev_log_priority</a> priority, void *data)</td></tr>
<tr class="memdesc:gaaee377cefdb5b19e55604173e68398b5"><td class="mdescLeft"> </td><td class="mdescRight">Set a printf-style logging handler for library-internal logging for this device context. <a href="#gaaee377cefdb5b19e55604173e68398b5">More...</a><br /></td></tr>
<tr class="separator:gaaee377cefdb5b19e55604173e68398b5"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="enum-members"></a>
Enumerations</h2></td></tr>
<tr class="memitem:ga0b798d0864f2b1b10e4603f9431b3364"><td class="memItemLeft" align="right" valign="top">enum  </td><td class="memItemRight" valign="bottom"><a class="el" href="group__logging.html#ga0b798d0864f2b1b10e4603f9431b3364">libevdev_log_priority</a> { <a class="el" href="group__logging.html#gga0b798d0864f2b1b10e4603f9431b3364a21fd1083f2ebd0a25f09ee982e365d5f">LIBEVDEV_LOG_ERROR</a>,
<a class="el" href="group__logging.html#gga0b798d0864f2b1b10e4603f9431b3364a4d13a031b112292ca3e7bab8c6d76abc">LIBEVDEV_LOG_INFO</a>,
<a class="el" href="group__logging.html#gga0b798d0864f2b1b10e4603f9431b3364a760d66d422ffcf89b0f1ddb529b95793">LIBEVDEV_LOG_DEBUG</a>
}</td></tr>
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="func-members"></a>
Functions</h2></td></tr>
<tr class="memitem:gaf6b6842a9ed98b61d0abb421e853fd89"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__logging.html#gaf6b6842a9ed98b61d0abb421e853fd89">libevdev_set_log_priority</a> (enum <a class="el" href="group__logging.html#ga0b798d0864f2b1b10e4603f9431b3364">libevdev_log_priority</a> priority)</td></tr>
<tr class="memdesc:gaf6b6842a9ed98b61d0abb421e853fd89"><td class="mdescLeft"> </td><td class="mdescRight">Define the minimum level to be printed to the log handler. <a href="#gaf6b6842a9ed98b61d0abb421e853fd89">More...</a><br /></td></tr>
<tr class="separator:gaf6b6842a9ed98b61d0abb421e853fd89"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga1da07493a798595cf85c127490b98ee8"><td class="memItemLeft" align="right" valign="top">enum <a class="el" href="group__logging.html#ga0b798d0864f2b1b10e4603f9431b3364">libevdev_log_priority</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__logging.html#ga1da07493a798595cf85c127490b98ee8">libevdev_get_log_priority</a> (void)</td></tr>
<tr class="memdesc:ga1da07493a798595cf85c127490b98ee8"><td class="mdescLeft"> </td><td class="mdescRight">Return the current log priority level. <a href="#ga1da07493a798595cf85c127490b98ee8">More...</a><br /></td></tr>
<tr class="separator:ga1da07493a798595cf85c127490b98ee8"><td class="memSeparator" colspan="2"> </td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<p>libevdev provides two methods of logging library-internal messages. </p>
<p>The old method is to provide a global log handler in <a class="el" href="group__logging.html#ga14b506281a64b81f6dd740fb43b1faaa" title="Set a printf-style logging handler for library-internal logging.">libevdev_set_log_function()</a>. The new method is to provide a per-context log handler in <a class="el" href="group__logging.html#gaaee377cefdb5b19e55604173e68398b5" title="Set a printf-style logging handler for library-internal logging for this device context.">libevdev_set_device_log_function()</a>. Developers are encouraged to use the per-context logging facilities over the global log handler as it provides access to the libevdev instance that caused a message, and is more flexible when libevdev is used from within a shared library.</p>
<p>If a caller sets both the global log handler and a per-context log handler, each device with a per-context log handler will only invoke that log handler.</p>
<dl class="section note"><dt>Note</dt><dd>To set a context-specific log handler, a context is needed. Thus developers are discouraged from using <a class="el" href="group__init.html#ga89bb5bce1c23e293293484b05b12aaf4" title="Initialize a new libevdev device from the given fd.">libevdev_new_from_fd()</a> as important messages from the device initialization process may get lost.</dd>
<dd>
A context-specific handler cannot be used for libevdev's uinput devices. <a class="el" href="group__uinput.html">uinput device creation</a> must use the global log handler. </dd></dl>
<h2 class="groupheader">Typedef Documentation</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#ga3bd32116aca4e7d1cfd741bf35a6e5ee">◆ </a></span>libevdev_device_log_func_t</h2>
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<td class="memname">typedef void(* libevdev_device_log_func_t) (const struct libevdev *dev, enum <a class="el" href="group__logging.html#ga0b798d0864f2b1b10e4603f9431b3364">libevdev_log_priority</a> priority, void *data, const char *file, int line, const char *func, const char *format, va_list args) <a class="el" href="libevdev_8h.html#a64a0f325e88e1be50eb806e1ff75aec8">LIBEVDEV_ATTRIBUTE_PRINTF</a>(7</td>
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<p>Logging function called by library-internal logging for a specific libevdev context. </p>
<p>This function is expected to treat its input like printf would.</p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">dev</td><td>The evdev device </td></tr>
<tr><td class="paramname">priority</td><td>Log priority of this message </td></tr>
<tr><td class="paramname">data</td><td>User-supplied data pointer (see <a class="el" href="group__logging.html#ga14b506281a64b81f6dd740fb43b1faaa" title="Set a printf-style logging handler for library-internal logging.">libevdev_set_log_function()</a>) </td></tr>
<tr><td class="paramname">file</td><td>libevdev source code file generating this message </td></tr>
<tr><td class="paramname">line</td><td>libevdev source code line generating this message </td></tr>
<tr><td class="paramname">func</td><td>libevdev source code function generating this message </td></tr>
<tr><td class="paramname">format</td><td>printf-style format string </td></tr>
<tr><td class="paramname">args</td><td>List of arguments</td></tr>
</table>
</dd>
</dl>
<dl class="section see"><dt>See also</dt><dd><a class="el" href="group__logging.html#ga14b506281a64b81f6dd740fb43b1faaa" title="Set a printf-style logging handler for library-internal logging.">libevdev_set_log_function</a> </dd></dl>
<dl class="section since"><dt>Since</dt><dd>1.3 </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#gaadd55a5932c7472fa3fbc95332d29418">◆ </a></span>libevdev_log_func_t</h2>
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<td class="memname">typedef void(* libevdev_log_func_t) (enum <a class="el" href="group__logging.html#ga0b798d0864f2b1b10e4603f9431b3364">libevdev_log_priority</a> priority, void *data, const char *file, int line, const char *func, const char *format, va_list args) <a class="el" href="libevdev_8h.html#a64a0f325e88e1be50eb806e1ff75aec8">LIBEVDEV_ATTRIBUTE_PRINTF</a>(6</td>
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<p>Logging function called by library-internal logging. </p>
<p>This function is expected to treat its input like printf would.</p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">priority</td><td>Log priority of this message </td></tr>
<tr><td class="paramname">data</td><td>User-supplied data pointer (see <a class="el" href="group__logging.html#ga14b506281a64b81f6dd740fb43b1faaa" title="Set a printf-style logging handler for library-internal logging.">libevdev_set_log_function()</a>) </td></tr>
<tr><td class="paramname">file</td><td>libevdev source code file generating this message </td></tr>
<tr><td class="paramname">line</td><td>libevdev source code line generating this message </td></tr>
<tr><td class="paramname">func</td><td>libevdev source code function generating this message </td></tr>
<tr><td class="paramname">format</td><td>printf-style format string </td></tr>
<tr><td class="paramname">args</td><td>List of arguments</td></tr>
</table>
</dd>
</dl>
<dl class="section see"><dt>See also</dt><dd><a class="el" href="group__logging.html#ga14b506281a64b81f6dd740fb43b1faaa" title="Set a printf-style logging handler for library-internal logging.">libevdev_set_log_function</a> </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#gaaee377cefdb5b19e55604173e68398b5">◆ </a></span>libevdev_set_device_log_function</h2>
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<td class="memname">typedef void(*) voi libevdev_set_device_log_function) (struct libevdev *dev, <a class="el" href="group__logging.html#ga3bd32116aca4e7d1cfd741bf35a6e5ee">libevdev_device_log_func_t</a> logfunc, enum <a class="el" href="group__logging.html#ga0b798d0864f2b1b10e4603f9431b3364">libevdev_log_priority</a> priority, void *data)</td>
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<p>Set a printf-style logging handler for library-internal logging for this device context. </p>
<p>The default logging function is NULL, i.e. the global log handler is invoked. If a context-specific log handler is set, the global log handler is not invoked for this device.</p>
<dl class="section note"><dt>Note</dt><dd>This log function applies for this device context only, even if another context exists for the same fd.</dd></dl>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">dev</td><td>The evdev device </td></tr>
<tr><td class="paramname">logfunc</td><td>The logging function for this device. If NULL, the current logging function is unset and logging falls back to the global log handler, if any. </td></tr>
<tr><td class="paramname">priority</td><td>Minimum priority to be printed to the log. </td></tr>
<tr><td class="paramname">data</td><td>User-specific data passed to the log handler.</td></tr>
</table>
</dd>
</dl>
<dl class="section note"><dt>Note</dt><dd>This function may be called before <a class="el" href="group__init.html#ga6658ac490d68c307ff8b8d1536c12b44" title="Set the fd for this struct and initialize internal data.">libevdev_set_fd()</a>. </dd></dl>
<dl class="section since"><dt>Since</dt><dd>1.3 </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#ga14b506281a64b81f6dd740fb43b1faaa">◆ </a></span>libevdev_set_log_function</h2>
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<td class="memname">typedef void(*) voi libevdev_set_log_function) (<a class="el" href="group__logging.html#gaadd55a5932c7472fa3fbc95332d29418">libevdev_log_func_t</a> logfunc, void *data)</td>
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<p>Set a printf-style logging handler for library-internal logging. </p>
<p>The default logging function is to stdout.</p>
<dl class="section note"><dt>Note</dt><dd>The global log handler is only called if no context-specific log handler has been set with <a class="el" href="group__logging.html#gaaee377cefdb5b19e55604173e68398b5" title="Set a printf-style logging handler for library-internal logging for this device context.">libevdev_set_device_log_function()</a>.</dd></dl>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">logfunc</td><td>The logging function for this device. If NULL, the current logging function is unset and no logging is performed. </td></tr>
<tr><td class="paramname">data</td><td>User-specific data passed to the log handler.</td></tr>
</table>
</dd>
</dl>
<dl class="section note"><dt>Note</dt><dd>This function may be called before <a class="el" href="group__init.html#ga6658ac490d68c307ff8b8d1536c12b44" title="Set the fd for this struct and initialize internal data.">libevdev_set_fd()</a>.</dd></dl>
<dl class="deprecated"><dt><b><a class="el" href="deprecated.html#_deprecated000001">Deprecated:</a></b></dt><dd>Use per-context logging instead, see <a class="el" href="group__logging.html#gaaee377cefdb5b19e55604173e68398b5" title="Set a printf-style logging handler for library-internal logging for this device context.">libevdev_set_device_log_function()</a>. </dd></dl>
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<h2 class="groupheader">Enumeration Type Documentation</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#ga0b798d0864f2b1b10e4603f9431b3364">◆ </a></span>libevdev_log_priority</h2>
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<td class="memname">enum <a class="el" href="group__logging.html#ga0b798d0864f2b1b10e4603f9431b3364">libevdev_log_priority</a></td>
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<table class="fieldtable">
<tr><th colspan="2">Enumerator</th></tr><tr><td class="fieldname"><a id="gga0b798d0864f2b1b10e4603f9431b3364a21fd1083f2ebd0a25f09ee982e365d5f"></a>LIBEVDEV_LOG_ERROR </td><td class="fielddoc"><p>critical errors and application bugs </p>
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<tr><td class="fieldname"><a id="gga0b798d0864f2b1b10e4603f9431b3364a4d13a031b112292ca3e7bab8c6d76abc"></a>LIBEVDEV_LOG_INFO </td><td class="fielddoc"><p>informational messages </p>
</td></tr>
<tr><td class="fieldname"><a id="gga0b798d0864f2b1b10e4603f9431b3364a760d66d422ffcf89b0f1ddb529b95793"></a>LIBEVDEV_LOG_DEBUG </td><td class="fielddoc"><p>debug information </p>
</td></tr>
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<h2 class="groupheader">Function Documentation</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#ga1da07493a798595cf85c127490b98ee8">◆ </a></span>libevdev_get_log_priority()</h2>
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<td class="memname">enum <a class="el" href="group__logging.html#ga0b798d0864f2b1b10e4603f9431b3364">libevdev_log_priority</a> libevdev_get_log_priority </td>
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<p>Return the current log priority level. </p>
<p>Messages higher than this level are printed, others are discarded. This is a global setting.</p>
<dl class="section return"><dt>Returns</dt><dd>the current log level</dd></dl>
<dl class="deprecated"><dt><b><a class="el" href="deprecated.html#_deprecated000003">Deprecated:</a></b></dt><dd>Use per-context logging instead, see <a class="el" href="group__logging.html#gaaee377cefdb5b19e55604173e68398b5" title="Set a printf-style logging handler for library-internal logging for this device context.">libevdev_set_device_log_function()</a>. </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#gaf6b6842a9ed98b61d0abb421e853fd89">◆ </a></span>libevdev_set_log_priority()</h2>
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<td class="memname">void libevdev_set_log_priority </td>
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<td class="paramtype">enum <a class="el" href="group__logging.html#ga0b798d0864f2b1b10e4603f9431b3364">libevdev_log_priority</a> </td>
<td class="paramname"><em>priority</em></td><td>)</td>
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<p>Define the minimum level to be printed to the log handler. </p>
<p>Messages higher than this level are printed, others are discarded. This is a global setting and applies to any future logging messages.</p>
<dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramname">priority</td><td>Minimum priority to be printed to the log.</td></tr>
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<dl class="deprecated"><dt><b><a class="el" href="deprecated.html#_deprecated000002">Deprecated:</a></b></dt><dd>Use per-context logging instead, see <a class="el" href="group__logging.html#gaaee377cefdb5b19e55604173e68398b5" title="Set a printf-style logging handler for library-internal logging for this device context.">libevdev_set_device_log_function()</a>. </dd></dl>
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