pub unsafe extern "C" fn u_sendmsg_ocall(
result: *mut isize,
error: *mut i32,
sockfd: i32,
msg_name: *const c_void,
msg_namelen: u32,
msg_iov: *const iovec,
msg_iovlen: usize,
msg_control: *const c_void,
msg_controllen: usize,
flags: i32
) -> SgxStatus