#[no_mangle] pub unsafe extern "C" fn u_sendmsg_ocall( error: *mut c_int, sockfd: c_int, msg_name: *mut c_void, msg_namelen: socklen_t, msg_iov: *mut iovec, msg_iovlen: usize, msg_control: *mut c_void, msg_controllen: usize, flags: c_int) -> ssize_t