gudev: add missing (nullable) annotations on return values

2 files changed, 34 insertions, 15 deletions

diff --git a/src/gudev/gudevclient.c b/src/gudev/gudevclient.c
index a151b50ac6..1eec758935 100644
--- a/src/gudev/gudevclient.c
+++ b/src/gudev/gudevclient.c
@@ -338,7 +338,10 @@ g_udev_client_new (const gchar * const *subsystems)
  *
  * Gets all devices belonging to @subsystem.
  *
- * Returns: (element-type GUdevDevice) (transfer full): A list of #GUdevDevice objects. The caller should free the result by using g_object_unref() on each element in the list and then g_list_free() on the list.
+ * Returns: (nullable) (element-type GUdevDevice) (transfer full): A
+ * list of #GUdevDevice objects. The caller should free the result by
+ * using g_object_unref() on each element in the list and then
+ * g_list_free() on the list.
  */
 GList *
 g_udev_client_query_by_subsystem (GUdevClient  *client,
@@ -391,7 +394,8 @@ g_udev_client_query_by_subsystem (GUdevClient  *client,
  *
  * Looks up a device for a type and device number.
  *
- * Returns: (transfer full): A #GUdevDevice object or %NULL if the device was not found. Free with g_object_unref().
+ * Returns: (nullable) (transfer full): A #GUdevDevice object or %NULL
+ * if the device was not found. Free with g_object_unref().
  */
 GUdevDevice *
 g_udev_client_query_by_device_number (GUdevClient      *client,
@@ -423,7 +427,8 @@ g_udev_client_query_by_device_number (GUdevClient      *client,
  *
  * Looks up a device for a device file.
  *
- * Returns: (transfer full): A #GUdevDevice object or %NULL if the device was not found. Free with g_object_unref().
+ * Returns: (nullable) (transfer full): A #GUdevDevice object or %NULL
+ * if the device was not found. Free with g_object_unref().
  */
 GUdevDevice *
 g_udev_client_query_by_device_file (GUdevClient  *client,
@@ -459,7 +464,8 @@ g_udev_client_query_by_device_file (GUdevClient  *client,
  *
  * Looks up a device for a sysfs path.
  *
- * Returns: (transfer full): A #GUdevDevice object or %NULL if the device was not found. Free with g_object_unref().
+ * Returns: (nullable) (transfer full): A #GUdevDevice object or %NULL
+ * if the device was not found. Free with g_object_unref().
  */
 GUdevDevice *
 g_udev_client_query_by_sysfs_path (GUdevClient  *client,
@@ -491,7 +497,8 @@ g_udev_client_query_by_sysfs_path (GUdevClient  *client,
  *
  * Looks up a device for a subsystem and name.
  *
- * Returns: (transfer full): A #GUdevDevice object or %NULL if the device was not found. Free with g_object_unref().
+ * Returns: (nullable) (transfer full): A #GUdevDevice object or %NULL
+ * if the device was not found. Free with g_object_unref().
  */
 GUdevDevice *
 g_udev_client_query_by_subsystem_and_name (GUdevClient  *client,
diff --git a/src/gudev/gudevdevice.c b/src/gudev/gudevdevice.c
index 2c768b7db7..7106719111 100644
--- a/src/gudev/gudevdevice.c
+++ b/src/gudev/gudevdevice.c
@@ -228,7 +228,8 @@ g_udev_device_get_sysfs_path (GUdevDevice *device)
  *
  * Gets the name of the driver used for @device.
  *
- * Returns: The name of the driver for @device or %NULL if unknown.
+ * Returns: (nullable): The name of the driver for @device or %NULL if
+ * unknown.
  */
 const gchar *
 g_udev_device_get_driver (GUdevDevice *device)
@@ -325,8 +326,8 @@ g_udev_device_get_device_number (GUdevDevice *device)
  *
  * Gets the device file for @device.
  *
- * Returns: The device file for @device or %NULL if no device file
- * exists.
+ * Returns: (nullable): The device file for @device or %NULL if no
+ * device file exists.
  */
 const gchar *
 g_udev_device_get_device_file (GUdevDevice *device)
@@ -375,7 +376,8 @@ g_udev_device_get_device_file_symlinks (GUdevDevice *device)
  *
  * Gets the immediate parent of @device, if any.
  *
- * Returns: (transfer full): A #GUdevDevice or %NULL if @device has no parent. Free with g_object_unref().
+ * Returns: (nullable) (transfer full): A #GUdevDevice or %NULL if
+ * @device has no parent. Free with g_object_unref().
  */
 GUdevDevice *
 g_udev_device_get_parent (GUdevDevice  *device)
@@ -406,7 +408,9 @@ g_udev_device_get_parent (GUdevDevice  *device)
  * Walks up the chain of parents of @device and returns the first
  * device encountered where @subsystem and @devtype matches, if any.
  *
- * Returns: (transfer full): A #GUdevDevice or %NULL if @device has no parent with @subsystem and @devtype. Free with g_object_unref().
+ * Returns: (nullable) (transfer full): A #GUdevDevice or %NULL if
+ * @device has no parent with @subsystem and @devtype. Free with
+ * g_object_unref().
  */
 GUdevDevice *
 g_udev_device_get_parent_with_subsystem (GUdevDevice  *device,
@@ -492,7 +496,8 @@ g_udev_device_has_property (GUdevDevice  *device,
  *
  * Look up the value for @key on @device.
  *
- * Returns: The value for @key or %NULL if @key doesn't exist on @device. Do not free this string, it is owned by @device.
+ * Returns: (nullable): The value for @key or %NULL if @key doesn't
+ * exist on @device. Do not free this string, it is owned by @device.
  */
 const gchar *
 g_udev_device_get_property (GUdevDevice  *device,
@@ -664,7 +669,10 @@ split_at_whitespace (const gchar *s)
  * horizontal tab ('\t'), and vertical tab ('\v') are considered; the
  * locale is not taken into account).
  *
- * Returns: (transfer none) (array zero-terminated=1) (element-type utf8): The value of @key on @device split into tokens or %NULL if @key doesn't exist. This array is owned by @device and should not be freed by the caller.
+ * Returns: (nullable) (transfer none) (array zero-terminated=1) (element-type utf8):
+ * The value of @key on @device split into tokens or %NULL if @key
+ * doesn't exist. This array is owned by @device and should not be
+ * freed by the caller.
  */
 const gchar* const *
 g_udev_device_get_property_as_strv (GUdevDevice  *device,
@@ -758,8 +766,9 @@ g_udev_device_has_sysfs_attr (GUdevDevice  *device,
  *
  * Look up the sysfs attribute with @name on @device.
  *
- * Returns: The value of the sysfs attribute or %NULL if there is no
- * such attribute. Do not free this string, it is owned by @device.
+ * Returns: (nullable): The value of the sysfs attribute or %NULL if
+ * there is no such attribute. Do not free this string, it is owned by
+ * @device.
  */
 const gchar *
 g_udev_device_get_sysfs_attr (GUdevDevice  *device,
@@ -907,7 +916,10 @@ g_udev_device_get_sysfs_attr_as_boolean (GUdevDevice  *device,
  * tab ('\t'), and vertical tab ('\v') are considered; the locale is
  * not taken into account).
  *
- * Returns: (transfer none) (array zero-terminated=1) (element-type utf8): The value of the sysfs attribute split into tokens or %NULL if there is no such attribute. This array is owned by @device and should not be freed by the caller.
+ * Returns: (nullable) (transfer none) (array zero-terminated=1) (element-type utf8):
+ * The value of the sysfs attribute split into tokens or %NULL if
+ * there is no such attribute. This array is owned by @device and
+ * should not be freed by the caller.
  */
 const gchar * const *
 g_udev_device_get_sysfs_attr_as_strv (GUdevDevice  *device,