Function gnunet_sys::GNUNET_TIME_relative_subtract

pub unsafe extern "C" fn GNUNET_TIME_relative_subtract(
    a1: GNUNET_TIME_Relative, 
    a2: GNUNET_TIME_Relative
) -> GNUNET_TIME_Relative

Subtract relative timestamp from the other.

@param a1 first timestamp @param a2 second timestamp @return ZERO if a2>=a1 (including both FOREVER), FOREVER if a1 is FOREVER, a1-a2 otherwise