1// Copyright Joyent, Inc. and other Node contributors. 2// 3// Permission is hereby granted, free of charge, to any person obtaining a 4// copy of this software and associated documentation files (the 5// "Software"), to deal in the Software without restriction, including 6// without limitation the rights to use, copy, modify, merge, publish, 7// distribute, sublicense, and/or sell copies of the Software, and to permit 8// persons to whom the Software is furnished to do so, subject to the 9// following conditions: 10// 11// The above copyright notice and this permission notice shall be included 12// in all copies or substantial portions of the Software. 13// 14// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS 15// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 16// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN 17// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, 18// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR 19// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE 20// USE OR OTHER DEALINGS IN THE SOFTWARE. 21 22'use strict'; 23 24require('../common'); 25const assert = require('assert'); 26const fs = require('fs'); 27const path = require('path'); 28const tmpdir = require('../common/tmpdir'); 29 30tmpdir.refresh(); 31const f = path.join(tmpdir.path, 'x.txt'); 32fs.closeSync(fs.openSync(f, 'w')); 33 34let changes = 0; 35function watchFile() { 36 fs.watchFile(f, (curr, prev) => { 37 // Make sure there is at least one watch event that shows a changed mtime. 38 if (curr.mtime <= prev.mtime) { 39 return; 40 } 41 changes++; 42 fs.unwatchFile(f); 43 watchFile(); 44 fs.unwatchFile(f); 45 }); 46} 47 48watchFile(); 49 50function changeFile() { 51 const fd = fs.openSync(f, 'w+'); 52 fs.writeSync(fd, 'xyz\n'); 53 fs.closeSync(fd); 54} 55 56changeFile(); 57const interval = setInterval(changeFile, 1000); 58// Use unref() here so fs.watchFile() watcher is the only thing keeping the 59// event loop open. 60interval.unref(); 61 62process.on('exit', function() { 63 assert.ok(changes > 0); 64}); 65