Function pamoja_serial_port_waited_micros 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn pamoja_serial_port_waited_micros(
    port: *const PamojaSerialPort,
) -> u64

Returns how long reads have waited without an answer, and waits have waited, in microseconds, whether or not the process slept through it.

Safety

port must be a live handle or null.