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doc: document that addMembership must be called once in a cluster #23746

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doc: document that addMembership must be called once in a cluster #23746

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doc: document that addMembership must be called once in a cluster
jasnell Oct 19, 2018
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18 changes: 18 additions & 0 deletions doc/api/dgram.md
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Original file line number Diff line number Diff line change
Expand Up @@ -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
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