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Cargo.toml

@@ -31,3 +31,4 @@ log = "0.4"
 env_logger = "0.10"
 socket2 = "0.5"
 rand = "0.8"
+libc = "0.2"

src/bin/server.rs

@@ -142,7 +142,11 @@ async fn listen_to_multicast(
     socket.set_reuse_address(true)?;
     
     #[cfg(unix)]
-    socket.set_reuse_port(true)?;
+    {
+        if let Err(e) = set_reuse_port_unix(&socket) {
+            warn!("Failed to set SO_REUSEPORT: {}", e);
+        }
+    }
     
     socket.set_nonblocking(true)?;
     socket.set_multicast_loop_v4(true)?;
@@ -216,6 +220,28 @@ async fn listen_to_multicast(
     }
 }
 
+#[cfg(unix)]
+fn set_reuse_port_unix(sock: &Socket) -> std::io::Result<()> {
+    use std::mem;
+    use std::os::fd::AsRawFd;
+    let fd = sock.as_raw_fd();
+    let val: libc::c_int = 1;
+    let ret = unsafe {
+        libc::setsockopt(
+            fd,
+            libc::SOL_SOCKET,
+            libc::SO_REUSEPORT,
+            &val as *const _ as *const libc::c_void,
+            mem::size_of_val(&val) as libc::socklen_t,
+        )
+    };
+    if ret == 0 {
+        Ok(())
+    } else {
+        Err(std::io::Error::last_os_error())
+    }
+}
+
 #[derive(PartialEq)]
 enum StatusMessageType {
     ClientHeartbeat,