It was a absolutely strange problem, the codes is quite simple:
```
~ cat main.js
var dgram = require('dgram'),
sock = dgram.createSocket('udp4');
sock.bind();
sock.setBroadcast(true);
```
And I first executed in shell environment with `node` command:
```
~ node main.js
dgram.js:348
throw errnoException(process._errno, 'setBroadcast');
^
Error: setBroadcast EBADF
at errnoException (dgram.js:457:11)
at Socket.setBroadcast (dgram.js:348:11)
at Object.<anonymous> (/Users/mailto1587/main.js:5:6)
at Module._compile (module.js:456:26)
at Object.Module._extensions..js (module.js:474:10)
at Module.load (module.js:356:32)
at Function.Module._load (module.js:312:12)
at Function.Module.runMain (module.js:497:10)
at startup (node.js:119:16)
at node.js:906:3
```
An exception raised, but what makes me surprised is that the same codes in REPL
environment was successfully executed:
```
~ node
> var dgram = require('dgram'),
... sock = dgram.createSocket('udp4');
undefined
> sock.bind();
undefined
> sock.setBroadcast(true);
undefined
>
```
An abnormal issue, help please!
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