A simple N-API native node module for the ioctl function
npm install ioctl-nativeioctl-native
============
A simple N-API native node module for the ioctl function
``sh`
$ npm install ioctl-native
`js`
const ioctl = require('ioctl-native'
rc = ioctl(fd, request, argp)
Issue a request to a device specified by the file descriptor fd withargp
an argument poinrter that should be an instance of a Buffer.
_Below is an example request to **get the number of bytes in the
input buffer**:_
`js
const FIONREAD = 0x541b
const status = Buffer.alloc(4) // 32 bit int (little endian)
const fd = getSocketFileDescriptor()
assert(0 === ioctl(fd, FIONREAD, status))
const pendingReads = status.readInt32LE(0)
`
The following is an example that creates two sockets, one
that is bound to an address and port, and the other that writes a
hello message of length 5. The example queries the pending number ofsockets.reader
bytes in the input buffer for the _reader socket_ () and
logs it out.
`js
const assert = require('assert')
const dgram = require('dgram')
const ioctl = require('ioctl-native')
const fs = require('fs')
const FIONREAD = 0x541b
const hello = Buffer.from('hello')
const status = Buffer.alloc(4) // 32 bit int (little endian)
const sockets = {
reader: dgram.createSocket('udp4'),
writer: dgram.createSocket('udp4'),
}
sockets.reader.bind(0, (err) => {
const { address, port } = sockets.reader.address()
sockets.writer.send(hello, 0, hello.length, port, address, (err) => {
assert(0 === ioctl(sockets.reader._handle.fd, FIONREAD, status))
const pending = status.readInt32LE(0)
console.log('> %d bytes pending in reader socket', pending) // pending == hello.length
sockets.reader.close()
sockets.writer.close()
})
})
``
MIT