Function sem_clockwait 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn sem_clockwait(
    sem: *mut sem_t,
    clock_id: clockid_t,
    abstime: *const timespec,
) -> c_int

See https://pubs.opengroup.org/onlinepubs/9799919799/functions/sem_clockwait.html.