wait.js

const fs = require('fs')
const gfs = require('./')
const filename = 'foo'
console.log('starting')

// fill up the set of available file descriptors
const fds = []
while (true) {
  try {
    fds.push(fs.openSync(filename, 'w'))
  } catch (er) {
    if (er.code !== 'ENFILE' && er.code !== 'EMFILE')
      throw er
    break
  }
}

// now we're fully booked.  kick off a gfs open.
gfs.open(filename, 'w', (er, fd) => {
  if (er)
    throw er
  console.log('got graceful fd', fd)
})

const int = setInterval(() => {
  fs.closeSync(fds.shift())
  if (!fds.length)
    clearInterval(int)
}, 100)
int.unref()