Accessors for the info event objects allowing to monitor changes in GPIO line status.
Callers are notified about changes in a line's status due to GPIO uAPI calls. Each info event contains information about the event itself (timestamp, type) as well as a snapshot of line's status in the form of a line-info object.
Line status change event types.
Enumerator |
---|
GPIOD_INFO_EVENT_LINE_REQUESTED |
Line has been requested.
|
GPIOD_INFO_EVENT_LINE_RELEASED |
Previously requested line has been released.
|
GPIOD_INFO_EVENT_LINE_CONFIG_CHANGED |
Line configuration has changed.
|
Free the info event object and release all associated resources.
- Parameters
-
Get the snapshot of line-info associated with the event.
- Parameters
-
event | Line info event object. |
- Returns
- Returns a pointer to the line-info object associated with the event. The object lifetime is tied to the event object, so the pointer must be not be freed by the caller.
- Warning
- Thread-safety: Since the line-info object is tied to the event, different threads may not operate on the event and line-info at the same time. The line-info can be copied using gpiod_line_info_copy in order to create a standalone object - which then may safely be used from a different thread concurrently.
Get the timestamp of the event.
- Parameters
-
event | Line status watch event. |
- Returns
- Timestamp in nanoseconds, read from the monotonic clock.