libudev: add documentation for recently added functions

libudev/docs/libudev-sections.txt

@@ -47,6 +47,7 @@ udev_device_get_sysnum
 udev_device_get_devnode
 udev_device_get_devlinks_list_entry
 udev_device_get_properties_list_entry
+udev_device_get_tags_list_entry
 udev_device_get_property_value
 udev_device_get_driver
 udev_device_get_devnum
@@ -65,6 +66,7 @@ udev_monitor_get_udev
 udev_monitor_new_from_netlink
 udev_monitor_new_from_socket
 udev_monitor_enable_receiving
+udev_monitor_set_receive_buffer_size
 udev_monitor_get_fd
 udev_monitor_receive_device
 udev_monitor_filter_add_match_subsystem_devtype

libudev/libudev-device.c

@@ -1287,6 +1287,17 @@ void udev_device_cleanup_tags_list(struct udev_device *udev_device)
 	udev_list_cleanup_entries(udev_device->udev, &udev_device->tags_list);
 }
 
+/**
+ * udev_device_get_tags_list_entry:
+ * @udev_device: udev device
+ *
+ * Retrieve the list of tags attached to the udev device. The next
+ * list entry can be retrieved with udev_list_entry_next(),
+ * which returns #NULL if no more entries exist. The tag string
+ * can be retrieved from the list entry by udev_list_get_name().
+ *
+ * Returns: the first entry of the tag list
+ **/
 struct udev_list_entry *udev_device_get_tags_list_entry(struct udev_device *udev_device)
 {
 	if (udev_device == NULL)

libudev/libudev-monitor.c

@@ -400,6 +400,16 @@ int udev_monitor_enable_receiving(struct udev_monitor *udev_monitor)
 	return 0;
 }
 
+/**
+ * udev_monitor_set_receive_buffer_size:
+ * @udev_monitor: the monitor which should receive events
+ * @size: the size in bytes
+ *
+ * Set the size of the kernel socket buffer. This call needs the
+ * appropriate privileges to succeed.
+ *
+ * Returns: 0 on success, otherwise -1 on error.
+ */
 int udev_monitor_set_receive_buffer_size(struct udev_monitor *udev_monitor, int size)
 {
 	if (udev_monitor == NULL)