pub(in sys) fn socketpair(
    domain: c_int,
    sock_type: c_int,
    protocol: c_int,
) -> Result<(SafeDescriptor, SafeDescriptor)>pub(in sys) fn socketpair(
    domain: c_int,
    sock_type: c_int,
    protocol: c_int,
) -> Result<(SafeDescriptor, SafeDescriptor)>