@@ -37,8 +37,13 @@ The daemon caches the data and waits until one of three conditions are met to se
- A measurement with different data for a known measurement id is received
If one of these conditions is met, the data is sent to the kernel module via the `data_t` struct that is defined in [`common/include/measurement.h`](common/include/measurement.h).
It contains a field for the pre-defined sender id, the count of measurements and the measurements themselves.
It contains a field for the pre-defined sender id, the count of measurements and a pointer to an array that holds the measurements.
The sent data contains the latest received measurements for each measurement id.
### Kernel module
To receive data from the userspace, the kernel creates a character device under `/dev/sibyl` where the userspace daemon writes the data to.
The data that is written to the character device is a pointer to a `data_t` struct, on write the kernel copies the data the pointer points to into kernel space.
When `data_t` is copied, it checkes if the pointer to the measurements array is not `NULL` and the count of measurements in `data_t` is not zero.
If both applies, it also copies the data from the array pointer to the kernel space.
