Function rmw_compare_gids_equal 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn rmw_compare_gids_equal(
    gid1: *const rmw_gid_t,
    gid2: *const rmw_gid_t,
    result: *mut bool,
) -> NrosRmwRet

See nros/rmw_entity.h.

Safety

Both gids must be valid for reads and result valid for writes when non-NULL.