TODO: TX_TIME is invalid for some reason

dgram/src/lib.rs

@@ -72,8 +72,8 @@ impl RecvData {
     }
 
     /// Returns the list of cmsgs which were returned from calling `recvmsg`. If
-    /// `recvmsg` was called with `recv_cmsgs` set to to `false`, this will
-    /// return an empty slice.
+    /// `recvmsg` was called with its [`RecvMsgCmsgSettings::store_cmsgs`]
+    /// field set to to `false`, this will return an empty slice.
     pub fn cmsgs(&self) -> &[ControlMessageOwned] {
         &self.cmsgs
     }

dgram/src/syscalls.rs

@@ -63,6 +63,7 @@ pub fn send_msg(
         cmsgs.push(ControlMessage::TxTime(&raw_time));
     }
 
+    let client_addr = dst.map(SockaddrStorage::from);
     raw_send_to(
         &fd.as_fd(),
         send_buf,
@@ -76,8 +77,9 @@ pub fn send_msg(
 #[cfg(target_os = "linux")]
 pub fn send_with_cmsgs(
     fd: impl AsFd, send_buf: &[u8], cmsgs: &[ControlMessage],
-    client_addr: &SockaddrStorage,
+    dst: Option<SocketAddr>,
 ) -> SyscallResult<usize> {
+    let client_addr = dst.map(SockaddrStorage::from);
     raw_send_to(&fd.as_fd(), send_buf, cmsgs, MsgFlags::empty(), client_addr)
 }
 
@@ -160,6 +162,19 @@ pub fn recv_msg(
     }
 }
 
+fn std_time_to_u64(time: &Instant) -> u64 {
+    const NANOS_PER_SEC: u64 = 1_000_000_000;
+    const INSTANT_ZERO: std::time::Instant =
+        unsafe { std::mem::transmute(std::time::UNIX_EPOCH) };
+
+    let raw_time = time.duration_since(INSTANT_ZERO);
+
+    let sec = raw_time.as_secs();
+    let nsec = raw_time.subsec_nanos();
+
+    sec * NANOS_PER_SEC + nsec as u64
+}
+
 #[cfg(all(test, target_os = "linux", not(target_os = "android")))]
 mod tests {
     use nix::cmsg_space;
@@ -315,7 +330,7 @@ mod tests {
 
         send_msg(send, send_buf, SendMsgCmsgSettings {
             segment_size: None,
-            tx_time: Some(Instant::now() + std::time::Duration::from_millis(5)),
+            tx_time: Some(Instant::now() + std::time::Duration::from_secs(5)),
             dst: addr,
         })?;