Function transmission_sys::tr_lowerBound

pub unsafe extern "C" fn tr_lowerBound(
    key: *const c_void, 
    base: *const c_void, 
    nmemb: usize, 
    size: usize, 
    compar: Option<unsafe extern "C" fn(key: *const c_void, arrayMember: *const c_void) -> c_int>, 
    exact_match: *mut bool
) -> c_int

@brief similar to bsearch() but returns the index of the lower bound