recv, send, and variants.
recv
send
pub use backend::net::send_recv::RecvFlags;
pub use backend::net::send_recv::ReturnFlags;
pub use backend::net::send_recv::SendFlags;
pub use msg::*;
recvmsg
sendmsg
recv(fd, buf, flags)
recvfrom(fd, buf, flags, addr, len)
send(fd, buf, flags)
sendto(fd, buf, flags, addr)