[fix] setsockopt errno 22

[yyk808]

fix #188 (comment)

seems like setsockopt() will regard buf.data() as (int*)? I'm not quite sure, however this commit will make the function return no error code.

Test

On the server side:

pipy -e 'pipy().listen(8000).connect('127.0.0.1:1234')'

On the client side:

pipy().task().onStart(new Message('Turn around')).connect('127.0.0.1:8000', {
	onState: (conn) => {
		if(conn.state === 'open') {
			console.info(conn.socket.setRawOption(1, 15, new Data([1])))
		}
	},
	bind: '127.0.0.1:1234'
})
.listen('127.0.0.1:1234').print()

The result we shall got:

[pajama-coder]

new Data(array) will always take the array as a byte array, so in the code where you made changes, buf.size() is always a size in bytes. When setsockopt() needs an int, which is 4 byte long, you should give it something like:

new Data([0, 0, 0, 0])

But that is endianness dependent. To use the current host's endianness, you can make use of the CStruct API like this:

var int32 = new CStruct({ v: 'int32' })
int32.encode({ v: 8 }) // returns new Data([8, 0, 0, 0]) on little endian systems

[yyk808]

Thank you for your patience on this topic. As this problem can be fixed on pjs side, I'll just close this pr.