fs.lchmod(fd, mode, [callback(err)])

fs.open('content.txt', 'a', function (err, fd) {   if (err) {     throw err;   }   fs.lchmod(fd, 0777, function(err){  if (err) {       throw err;     }  console.log('fchmod complete');     fs.close(fd, function () {       console.log('Done');     });   }) });

fs.lchmod = function(path, mode, callback) {     callback = maybeCallback(callback);     fs.open(path, constants.O_WRONLY | constants.O_SYMLINK, function(err, fd) {       if (err) {         callback(err);         return;       }       // prefer to return the chmod error, if one occurs,       // but still try to close, and report closing errors if they occur.       fs.fchmod(fd, mode, function(err) {         fs.close(fd, function(err2) {           callback(err || err2);         });       });     });   };