node/test/parallel/test-fs-fsync.js

// Copyright Joyent, Inc. and other Node contributors.
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'use strict';
const common = require('../common');
const assert = require('assert');
const fixtures = require('../common/fixtures');

const fs = require('fs');
const path = require('path');

const fileFixture = fixtures.path('a.js');
const fileTemp = path.join(common.tmpDir, 'a.js');

// Copy fixtures to temp.
common.refreshTmpDir();
fs.copyFileSync(fileFixture, fileTemp);

fs.open(fileFixture, 'a', 0o777, common.mustCall(function(err, fd) {
  assert.ifError(err);

  fs.fdatasyncSync(fd);

  fs.fsyncSync(fd);

  fs.fdatasync(fd, common.mustCall(function(err) {
    assert.ifError(err);
    fs.fsync(fd, common.mustCall(function(err) {
      assert.ifError(err);
    }));
  }));
}));