Function IOConnectAddClient 

pub extern "C-unwind" fn IOConnectAddClient(
    connect: io_connect_t,
    client: io_connect_t,
) -> kern_return_t

Available on crate feature libc only.

Inform a connection of a second connection.

This is a generic method to inform a family connection of a second connection, and is rarely used.

Parameter connect: The connect handle created by IOServiceOpen.

Parameter client: Another connect handle created by IOServiceOpen.

Returns: A kern_return_t error code returned by the family.