os-lock/index.js

Cross-platform file locking/unlocking

const util = require('util');

const addon = require('./build/Release/addon');

const _lock = util.promisify(addon.lock);
const _unlock = util.promisify(addon.unlock);

function lock(
  fd, startOrOptions, length = 0,
  { exclusive = false, immediate = false } = {}
) {
  let start = 0;
  if (typeof startOrOptions == 'number')
    start = startOrOptions;
  else if (startOrOptions)
    ({ exclusive, immediate } = { exclusive, immediate, ...startOrOptions });
  return _lock(fd, start, length, exclusive, immediate);
}

function unlock(fd, start = 0, length = 0) {
  return _unlock(fd, start, length);
}

module.exports.lock = lock;
module.exports.unlock = unlock;