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Original file line number | Diff line number | Diff line change |
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use nix::sys::socket::*; | ||
use nix::sys::uio::IoVec; | ||
use nix::sys::time::*; | ||
use std::time::*; | ||
|
||
fn main() { | ||
// Set up | ||
let message = "Ohayō!".as_bytes(); | ||
let in_socket = socket( | ||
AddressFamily::Inet, | ||
SockType::Datagram, | ||
SockFlag::empty(), | ||
None).unwrap(); | ||
setsockopt(in_socket, sockopt::ReceiveTimestampNs, &true).unwrap(); | ||
let localhost = InetAddr::new(IpAddr::new_v4(127, 0, 0, 1), 0); | ||
bind(in_socket, &SockAddr::new_inet(localhost)).unwrap(); | ||
let address = getsockname(in_socket).unwrap(); | ||
// Get initial time | ||
let time0 = SystemTime::now(); | ||
// Send the message | ||
let iov = [IoVec::from_slice(message)]; | ||
let flags = MsgFlags::empty(); | ||
let l = sendmsg(in_socket, &iov, &[], flags, Some(&address)).unwrap(); | ||
assert_eq!(message.len(), l); | ||
// Receive the message | ||
let mut buffer = vec![0u8; message.len()]; | ||
let mut cmsgspace = nix::cmsg_space!(TimeSpec); | ||
let iov = [IoVec::from_mut_slice(&mut buffer)]; | ||
let r = recvmsg(in_socket, &iov, Some(&mut cmsgspace), flags).unwrap(); | ||
let rtime = match r.cmsgs().next() { | ||
Some(ControlMessageOwned::ScmTimestampNs(rtime)) => rtime, | ||
Some(_) => panic!("Unexpected control message"), | ||
None => panic!("No control message") | ||
}; | ||
// Check the final time | ||
let time1 = SystemTime::now(); | ||
// the packet's received timestamp should lie in-between the two system | ||
// times, unless the system clock was adjusted in the meantime. | ||
let rduration = Duration::new(rtime.tv_sec() as u64, | ||
rtime.tv_nsec() as u32); | ||
assert!(time0.duration_since(UNIX_EPOCH).unwrap() <= rduration); | ||
assert!(rduration <= time1.duration_since(UNIX_EPOCH).unwrap()); | ||
// Close socket | ||
nix::unistd::close(in_socket).unwrap(); | ||
} |