node/test/sequential/test-child-process-emfile.js

'use strict';
var common = require('../common');
var assert = require('assert');
var spawn = require('child_process').spawn;
var fs = require('fs');

if (common.isWindows) {
  console.log('1..0 # Skipped: no RLIMIT_NOFILE on Windows');
  return;
}

var openFds = [];

for (;;) {
  try {
    openFds.push(fs.openSync(__filename, 'r'));
  } catch (err) {
    assert(err.code === 'EMFILE' || err.code === 'ENFILE');
    break;
  }
}

// Should emit an error, not throw.
var proc = spawn(process.execPath, ['-e', '0']);

proc.on('error', common.mustCall(function(err) {
  assert(err.code === 'EMFILE' || err.code === 'ENFILE');
}));

proc.on('exit', function() {
  const msg = '"exit" should not be emitted (the process never spawned!)';
  assert.fail(null, null, msg);
});

// close one fd for LSan
if (openFds.length >= 1) {
  fs.closeSync(openFds.pop());
}