@brief Check if the line is currently in use.
@param line GPIO line object.
@return True if the line is in use, false otherwise.
The user space can't know exactly why a line is busy. It may have been
requested by another process or hogged by the kernel. It only matters that
the line is used and we can't request it.
@brief Check if the line is currently in use. @param line GPIO line object. @return True if the line is in use, false otherwise.
The user space can't know exactly why a line is busy. It may have been requested by another process or hogged by the kernel. It only matters that the line is used and we can't request it.