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| <a href="#libudev-udev-monitor.synopsis" class="shortcut">Top</a> |
| | |
| <a href="#libudev-udev-monitor.description" class="shortcut">Description</a> |
| </td></tr> |
| </table> |
| <div class="refentry" title="udev_monitor"> |
| <a name="libudev-udev-monitor"></a><div class="titlepage"></div> |
| <div class="refnamediv"><table width="100%"><tr> |
| <td valign="top"> |
| <h2><span class="refentrytitle"><a name="libudev-udev-monitor.top_of_page"></a>udev_monitor</span></h2> |
| <p>udev_monitor — device event source</p> |
| </td> |
| <td valign="top" align="right"></td> |
| </tr></table></div> |
| <div class="refsynopsisdiv" title="Synopsis"> |
| <a name="libudev-udev-monitor.synopsis"></a><h2>Synopsis</h2> |
| <pre class="synopsis">struct <a class="link" href="libudev-udev-monitor.html#udev-monitor" title="struct udev_monitor">udev_monitor</a>; |
| struct <a class="link" href="libudev-udev-monitor.html#udev-monitor" title="struct udev_monitor"><span class="returnvalue">udev_monitor</span></a> * <a class="link" href="libudev-udev-monitor.html#udev-monitor-ref" title="udev_monitor_ref ()">udev_monitor_ref</a> (<em class="parameter"><code><span class="type">struct udev_monitor</span> *udev_monitor</code></em>); |
| <span class="returnvalue">void</span> <a class="link" href="libudev-udev-monitor.html#udev-monitor-unref" title="udev_monitor_unref ()">udev_monitor_unref</a> (<em class="parameter"><code><span class="type">struct udev_monitor</span> *udev_monitor</code></em>); |
| struct <a class="link" href="libudev-udev.html#udev" title="struct udev"><span class="returnvalue">udev</span></a> * <a class="link" href="libudev-udev-monitor.html#udev-monitor-get-udev" title="udev_monitor_get_udev ()">udev_monitor_get_udev</a> (<em class="parameter"><code><span class="type">struct udev_monitor</span> *udev_monitor</code></em>); |
| struct <a class="link" href="libudev-udev-monitor.html#udev-monitor" title="struct udev_monitor"><span class="returnvalue">udev_monitor</span></a> * <a class="link" href="libudev-udev-monitor.html#udev-monitor-new-from-netlink" title="udev_monitor_new_from_netlink ()">udev_monitor_new_from_netlink</a> (<em class="parameter"><code><span class="type">struct udev</span> *udev</code></em>, |
| <em class="parameter"><code>const <span class="type">char</span> *name</code></em>); |
| struct <a class="link" href="libudev-udev-monitor.html#udev-monitor" title="struct udev_monitor"><span class="returnvalue">udev_monitor</span></a> * <a class="link" href="libudev-udev-monitor.html#udev-monitor-new-from-socket" title="udev_monitor_new_from_socket ()">udev_monitor_new_from_socket</a> (<em class="parameter"><code><span class="type">struct udev</span> *udev</code></em>, |
| <em class="parameter"><code>const <span class="type">char</span> *socket_path</code></em>); |
| <span class="returnvalue">int</span> <a class="link" href="libudev-udev-monitor.html#udev-monitor-enable-receiving" title="udev_monitor_enable_receiving ()">udev_monitor_enable_receiving</a> (<em class="parameter"><code><span class="type">struct udev_monitor</span> *udev_monitor</code></em>); |
| <span class="returnvalue">int</span> <a class="link" href="libudev-udev-monitor.html#udev-monitor-set-receive-buffer-size" title="udev_monitor_set_receive_buffer_size ()">udev_monitor_set_receive_buffer_size</a> |
| (<em class="parameter"><code><span class="type">struct udev_monitor</span> *udev_monitor</code></em>, |
| <em class="parameter"><code><span class="type">int</span> size</code></em>); |
| <span class="returnvalue">int</span> <a class="link" href="libudev-udev-monitor.html#udev-monitor-get-fd" title="udev_monitor_get_fd ()">udev_monitor_get_fd</a> (<em class="parameter"><code><span class="type">struct udev_monitor</span> *udev_monitor</code></em>); |
| struct <a class="link" href="libudev-udev-device.html#udev-device" title="struct udev_device"><span class="returnvalue">udev_device</span></a> * <a class="link" href="libudev-udev-monitor.html#udev-monitor-receive-device" title="udev_monitor_receive_device ()">udev_monitor_receive_device</a> (<em class="parameter"><code><span class="type">struct udev_monitor</span> *udev_monitor</code></em>); |
| <span class="returnvalue">int</span> <a class="link" href="libudev-udev-monitor.html#udev-monitor-filter-add-match-subsystem-devtype" title="udev_monitor_filter_add_match_subsystem_devtype ()">udev_monitor_filter_add_match_subsystem_devtype</a> |
| (<em class="parameter"><code><span class="type">struct udev_monitor</span> *udev_monitor</code></em>, |
| <em class="parameter"><code>const <span class="type">char</span> *subsystem</code></em>, |
| <em class="parameter"><code>const <span class="type">char</span> *devtype</code></em>); |
| <span class="returnvalue">int</span> <a class="link" href="libudev-udev-monitor.html#udev-monitor-filter-add-match-tag" title="udev_monitor_filter_add_match_tag ()">udev_monitor_filter_add_match_tag</a> (<em class="parameter"><code><span class="type">struct udev_monitor</span> *udev_monitor</code></em>, |
| <em class="parameter"><code>const <span class="type">char</span> *tag</code></em>); |
| <span class="returnvalue">int</span> <a class="link" href="libudev-udev-monitor.html#udev-monitor-filter-update" title="udev_monitor_filter_update ()">udev_monitor_filter_update</a> (<em class="parameter"><code><span class="type">struct udev_monitor</span> *udev_monitor</code></em>); |
| <span class="returnvalue">int</span> <a class="link" href="libudev-udev-monitor.html#udev-monitor-filter-remove" title="udev_monitor_filter_remove ()">udev_monitor_filter_remove</a> (<em class="parameter"><code><span class="type">struct udev_monitor</span> *udev_monitor</code></em>); |
| </pre> |
| </div> |
| <div class="refsect1" title="Description"> |
| <a name="libudev-udev-monitor.description"></a><h2>Description</h2> |
| <p> |
| Connects to a device event source. |
| </p> |
| </div> |
| <div class="refsect1" title="Details"> |
| <a name="libudev-udev-monitor.details"></a><h2>Details</h2> |
| <div class="refsect2" title="struct udev_monitor"> |
| <a name="udev-monitor"></a><h3>struct udev_monitor</h3> |
| <pre class="programlisting">struct udev_monitor;</pre> |
| <p> |
| Opaque object handling one event source. |
| </p> |
| </div> |
| <hr> |
| <div class="refsect2" title="udev_monitor_ref ()"> |
| <a name="udev-monitor-ref"></a><h3>udev_monitor_ref ()</h3> |
| <pre class="programlisting">struct <a class="link" href="libudev-udev-monitor.html#udev-monitor" title="struct udev_monitor"><span class="returnvalue">udev_monitor</span></a> * udev_monitor_ref (<em class="parameter"><code><span class="type">struct udev_monitor</span> *udev_monitor</code></em>);</pre> |
| <p> |
| Take a reference of a udev monitor. |
| </p> |
| <div class="variablelist"><table border="0"> |
| <col align="left" valign="top"> |
| <tbody> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>udev_monitor</code></em> :</span></p></td> |
| <td>udev monitor |
| </td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td> |
| <td> the passed udev monitor |
| </td> |
| </tr> |
| </tbody> |
| </table></div> |
| </div> |
| <hr> |
| <div class="refsect2" title="udev_monitor_unref ()"> |
| <a name="udev-monitor-unref"></a><h3>udev_monitor_unref ()</h3> |
| <pre class="programlisting"><span class="returnvalue">void</span> udev_monitor_unref (<em class="parameter"><code><span class="type">struct udev_monitor</span> *udev_monitor</code></em>);</pre> |
| <p> |
| Drop a reference of a udev monitor. If the refcount reaches zero, |
| the bound socket will be closed, and the resources of the monitor |
| will be released. |
| </p> |
| <div class="variablelist"><table border="0"> |
| <col align="left" valign="top"> |
| <tbody><tr> |
| <td><p><span class="term"><em class="parameter"><code>udev_monitor</code></em> :</span></p></td> |
| <td>udev monitor |
| </td> |
| </tr></tbody> |
| </table></div> |
| </div> |
| <hr> |
| <div class="refsect2" title="udev_monitor_get_udev ()"> |
| <a name="udev-monitor-get-udev"></a><h3>udev_monitor_get_udev ()</h3> |
| <pre class="programlisting">struct <a class="link" href="libudev-udev.html#udev" title="struct udev"><span class="returnvalue">udev</span></a> * udev_monitor_get_udev (<em class="parameter"><code><span class="type">struct udev_monitor</span> *udev_monitor</code></em>);</pre> |
| <p> |
| Retrieve the udev library context the monitor was created with. |
| </p> |
| <div class="variablelist"><table border="0"> |
| <col align="left" valign="top"> |
| <tbody> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>udev_monitor</code></em> :</span></p></td> |
| <td>udev monitor |
| </td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td> |
| <td> the udev library context |
| </td> |
| </tr> |
| </tbody> |
| </table></div> |
| </div> |
| <hr> |
| <div class="refsect2" title="udev_monitor_new_from_netlink ()"> |
| <a name="udev-monitor-new-from-netlink"></a><h3>udev_monitor_new_from_netlink ()</h3> |
| <pre class="programlisting">struct <a class="link" href="libudev-udev-monitor.html#udev-monitor" title="struct udev_monitor"><span class="returnvalue">udev_monitor</span></a> * udev_monitor_new_from_netlink (<em class="parameter"><code><span class="type">struct udev</span> *udev</code></em>, |
| <em class="parameter"><code>const <span class="type">char</span> *name</code></em>);</pre> |
| <p> |
| Create new udev monitor and connect to a specified event |
| source. Valid sources identifiers are "udev" and "kernel". |
| </p> |
| <p> |
| Applications should usually not connect directly to the |
| "kernel" events, because the devices might not be useable |
| at that time, before udev has configured them, and created |
| device nodes. |
| </p> |
| <p> |
| Accessing devices at the same time as udev, might result |
| in unpredictable behavior. |
| </p> |
| <p> |
| The "udev" events are sent out after udev has finished its |
| event processing, all rules have been processed, and needed |
| device nodes are created. |
| </p> |
| <p> |
| The initial refcount is 1, and needs to be decremented to |
| release the resources of the udev monitor. |
| </p> |
| <div class="variablelist"><table border="0"> |
| <col align="left" valign="top"> |
| <tbody> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>udev</code></em> :</span></p></td> |
| <td>udev library context |
| </td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>name</code></em> :</span></p></td> |
| <td>name of event source |
| </td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td> |
| <td> a new udev monitor, or <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><span class="type">NULL</span></a>, in case of an error |
| </td> |
| </tr> |
| </tbody> |
| </table></div> |
| </div> |
| <hr> |
| <div class="refsect2" title="udev_monitor_new_from_socket ()"> |
| <a name="udev-monitor-new-from-socket"></a><h3>udev_monitor_new_from_socket ()</h3> |
| <pre class="programlisting">struct <a class="link" href="libudev-udev-monitor.html#udev-monitor" title="struct udev_monitor"><span class="returnvalue">udev_monitor</span></a> * udev_monitor_new_from_socket (<em class="parameter"><code><span class="type">struct udev</span> *udev</code></em>, |
| <em class="parameter"><code>const <span class="type">char</span> *socket_path</code></em>);</pre> |
| <p> |
| Create new udev monitor and connect to a specified socket. The |
| path to a socket either points to an existing socket file, or if |
| the socket path starts with a '@' character, an abstract namespace |
| socket will be used. |
| </p> |
| <p> |
| A socket file will not be created. If it does not already exist, |
| it will fall-back and connect to an abstract namespace socket with |
| the given path. The permissions adjustment of a socket file, as |
| well as the later cleanup, needs to be done by the caller. |
| </p> |
| <p> |
| The initial refcount is 1, and needs to be decremented to |
| release the resources of the udev monitor. |
| </p> |
| <div class="variablelist"><table border="0"> |
| <col align="left" valign="top"> |
| <tbody> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>udev</code></em> :</span></p></td> |
| <td>udev library context |
| </td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>socket_path</code></em> :</span></p></td> |
| <td>unix socket path |
| </td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td> |
| <td> a new udev monitor, or <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><span class="type">NULL</span></a>, in case of an error |
| </td> |
| </tr> |
| </tbody> |
| </table></div> |
| </div> |
| <hr> |
| <div class="refsect2" title="udev_monitor_enable_receiving ()"> |
| <a name="udev-monitor-enable-receiving"></a><h3>udev_monitor_enable_receiving ()</h3> |
| <pre class="programlisting"><span class="returnvalue">int</span> udev_monitor_enable_receiving (<em class="parameter"><code><span class="type">struct udev_monitor</span> *udev_monitor</code></em>);</pre> |
| <p> |
| Binds the <em class="parameter"><code>udev_monitor</code></em> socket to the event source. |
| </p> |
| <div class="variablelist"><table border="0"> |
| <col align="left" valign="top"> |
| <tbody> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>udev_monitor</code></em> :</span></p></td> |
| <td>the monitor which should receive events |
| </td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td> |
| <td> 0 on success, otherwise a negative error value. |
| </td> |
| </tr> |
| </tbody> |
| </table></div> |
| </div> |
| <hr> |
| <div class="refsect2" title="udev_monitor_set_receive_buffer_size ()"> |
| <a name="udev-monitor-set-receive-buffer-size"></a><h3>udev_monitor_set_receive_buffer_size ()</h3> |
| <pre class="programlisting"><span class="returnvalue">int</span> udev_monitor_set_receive_buffer_size |
| (<em class="parameter"><code><span class="type">struct udev_monitor</span> *udev_monitor</code></em>, |
| <em class="parameter"><code><span class="type">int</span> size</code></em>);</pre> |
| <p> |
| Set the size of the kernel socket buffer. This call needs the |
| appropriate privileges to succeed. |
| </p> |
| <div class="variablelist"><table border="0"> |
| <col align="left" valign="top"> |
| <tbody> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>udev_monitor</code></em> :</span></p></td> |
| <td>the monitor which should receive events |
| </td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>size</code></em> :</span></p></td> |
| <td>the size in bytes |
| </td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td> |
| <td> 0 on success, otherwise -1 on error. |
| </td> |
| </tr> |
| </tbody> |
| </table></div> |
| </div> |
| <hr> |
| <div class="refsect2" title="udev_monitor_get_fd ()"> |
| <a name="udev-monitor-get-fd"></a><h3>udev_monitor_get_fd ()</h3> |
| <pre class="programlisting"><span class="returnvalue">int</span> udev_monitor_get_fd (<em class="parameter"><code><span class="type">struct udev_monitor</span> *udev_monitor</code></em>);</pre> |
| <p> |
| Retrieve the socket file descriptor associated with the monitor. |
| </p> |
| <div class="variablelist"><table border="0"> |
| <col align="left" valign="top"> |
| <tbody> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>udev_monitor</code></em> :</span></p></td> |
| <td>udev monitor |
| </td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td> |
| <td> the socket file descriptor |
| </td> |
| </tr> |
| </tbody> |
| </table></div> |
| </div> |
| <hr> |
| <div class="refsect2" title="udev_monitor_receive_device ()"> |
| <a name="udev-monitor-receive-device"></a><h3>udev_monitor_receive_device ()</h3> |
| <pre class="programlisting">struct <a class="link" href="libudev-udev-device.html#udev-device" title="struct udev_device"><span class="returnvalue">udev_device</span></a> * udev_monitor_receive_device (<em class="parameter"><code><span class="type">struct udev_monitor</span> *udev_monitor</code></em>);</pre> |
| <p> |
| Receive data from the udev monitor socket, allocate a new udev |
| device, fill in the received data, and return the device. |
| </p> |
| <p> |
| Only socket connections with uid=0 are accepted. The caller |
| needs to make sure that there is data to read from the socket. |
| The call will block until the socket becomes readable. |
| </p> |
| <p> |
| The initial refcount is 1, and needs to be decremented to |
| release the resources of the udev device. |
| </p> |
| <div class="variablelist"><table border="0"> |
| <col align="left" valign="top"> |
| <tbody> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>udev_monitor</code></em> :</span></p></td> |
| <td>udev monitor |
| </td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td> |
| <td> a new udev device, or <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><span class="type">NULL</span></a>, in case of an error |
| </td> |
| </tr> |
| </tbody> |
| </table></div> |
| </div> |
| <hr> |
| <div class="refsect2" title="udev_monitor_filter_add_match_subsystem_devtype ()"> |
| <a name="udev-monitor-filter-add-match-subsystem-devtype"></a><h3>udev_monitor_filter_add_match_subsystem_devtype ()</h3> |
| <pre class="programlisting"><span class="returnvalue">int</span> udev_monitor_filter_add_match_subsystem_devtype |
| (<em class="parameter"><code><span class="type">struct udev_monitor</span> *udev_monitor</code></em>, |
| <em class="parameter"><code>const <span class="type">char</span> *subsystem</code></em>, |
| <em class="parameter"><code>const <span class="type">char</span> *devtype</code></em>);</pre> |
| <p> |
| This filer is efficiently executed inside the kernel, and libudev subscribers |
| will usually not be woken up for devices which do not match. |
| </p> |
| <p> |
| The filter must be installed before the monitor is switched to listening mode. |
| </p> |
| <div class="variablelist"><table border="0"> |
| <col align="left" valign="top"> |
| <tbody> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>udev_monitor</code></em> :</span></p></td> |
| <td>the monitor |
| </td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>subsystem</code></em> :</span></p></td> |
| <td>the subsystem value to match the incoming devices against |
| </td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>devtype</code></em> :</span></p></td> |
| <td>the devtype value to match the incoming devices against |
| </td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td> |
| <td> 0 on success, otherwise a negative error value. |
| </td> |
| </tr> |
| </tbody> |
| </table></div> |
| </div> |
| <hr> |
| <div class="refsect2" title="udev_monitor_filter_add_match_tag ()"> |
| <a name="udev-monitor-filter-add-match-tag"></a><h3>udev_monitor_filter_add_match_tag ()</h3> |
| <pre class="programlisting"><span class="returnvalue">int</span> udev_monitor_filter_add_match_tag (<em class="parameter"><code><span class="type">struct udev_monitor</span> *udev_monitor</code></em>, |
| <em class="parameter"><code>const <span class="type">char</span> *tag</code></em>);</pre> |
| <p> |
| This filer is efficiently executed inside the kernel, and libudev subscribers |
| will usually not be woken up for devices which do not match. |
| </p> |
| <p> |
| The filter must be installed before the monitor is switched to listening mode. |
| </p> |
| <div class="variablelist"><table border="0"> |
| <col align="left" valign="top"> |
| <tbody> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>udev_monitor</code></em> :</span></p></td> |
| <td>the monitor |
| </td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>tag</code></em> :</span></p></td> |
| <td>the name of a tag |
| </td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td> |
| <td> 0 on success, otherwise a negative error value. |
| </td> |
| </tr> |
| </tbody> |
| </table></div> |
| </div> |
| <hr> |
| <div class="refsect2" title="udev_monitor_filter_update ()"> |
| <a name="udev-monitor-filter-update"></a><h3>udev_monitor_filter_update ()</h3> |
| <pre class="programlisting"><span class="returnvalue">int</span> udev_monitor_filter_update (<em class="parameter"><code><span class="type">struct udev_monitor</span> *udev_monitor</code></em>);</pre> |
| <p> |
| Update the installed filter. This might only be needed, if the filter was removed or changed. |
| </p> |
| <div class="variablelist"><table border="0"> |
| <col align="left" valign="top"> |
| <tbody> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>udev_monitor</code></em> :</span></p></td> |
| <td>monitor |
| </td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td> |
| <td> 0 on success, otherwise a negative error value. |
| </td> |
| </tr> |
| </tbody> |
| </table></div> |
| </div> |
| <hr> |
| <div class="refsect2" title="udev_monitor_filter_remove ()"> |
| <a name="udev-monitor-filter-remove"></a><h3>udev_monitor_filter_remove ()</h3> |
| <pre class="programlisting"><span class="returnvalue">int</span> udev_monitor_filter_remove (<em class="parameter"><code><span class="type">struct udev_monitor</span> *udev_monitor</code></em>);</pre> |
| <p> |
| Remove all filters from monitor. |
| </p> |
| <div class="variablelist"><table border="0"> |
| <col align="left" valign="top"> |
| <tbody> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>udev_monitor</code></em> :</span></p></td> |
| <td>monitor |
| </td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td> |
| <td> 0 on success, otherwise a negative error value. |
| </td> |
| </tr> |
| </tbody> |
| </table></div> |
| </div> |
| </div> |
| </div> |
| <div class="footer"> |
| <hr> |
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