Function gnunet_sys::GNUNET_TIME_absolute_subtract

pub unsafe extern "C" fn GNUNET_TIME_absolute_subtract(
    start: GNUNET_TIME_Absolute, 
    duration: GNUNET_TIME_Relative
) -> GNUNET_TIME_Absolute

Subtract a given relative duration from the given start time.

@param start some absolute time @param duration some relative time to subtract @return ZERO if start <= duration, or FOREVER if start time is FOREVER; start-duration otherwise