nodejs
diff --git a/Collapse file
‎doc/api/dgram.md‎
Copy file name to clipboardExpand all lines: doc/api/dgram.md
+18Lines changed: 18 additions & 0 deletions
Display the source diff
Display the rich diff b/Collapse file
‎doc/api/dgram.md‎
Copy file name to clipboardExpand all lines: doc/api/dgram.md
+18Lines changed: 18 additions & 0 deletions
Display the source diff
Display the rich diff
@@ -95,6 +95,24 @@ Tells the kernel to join a multicast group at the given `multicastAddress` and
 one interface and will add membership to it. To add membership to every
 available interface, call `addMembership` multiple times, once per interface.
 
+When sharing a UDP socket across multiple `cluster` workers, the
+`socket.addMembership()` function must be called only once or an
+`EADDRINUSE` error will occur:
+
+```js
+const cluster = require('cluster');
+const dgram = require('dgram');
+if (cluster.isMaster) {
+  cluster.fork(); // Works ok.
+  cluster.fork(); // Fails with EADDRINUSE.
+} else {
+  const s = dgram.createSocket('udp4');
+  s.bind(1234, () => {
+    s.addMembership('224.0.0.114');
+  });
+}
+```
+
 ### socket.address()
 <!-- YAML
 added: v0.1.99