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'use strict';
const common = require('../common');
const assert = require('assert');
const child_process = require('child_process');
const fs = require('fs');
const stream = require('stream');
if (!common.isLinux)
common.skip('The fs watch limit is OS-dependent');
if (!common.enoughTestCpu)
common.skip('This test is resource-intensive');
try {
// Ensure inotify limit is low enough for the test to actually exercise the
// limit with small enough resources.
const limit = Number(
fs.readFileSync('/proc/sys/fs/inotify/max_user_watches', 'utf8'));
if (limit > 16384)
common.skip('inotify limit is quite large');
} catch (e) {
if (e.code === 'ENOENT')
common.skip('the inotify /proc subsystem does not exist');
// Fail on other errors.
throw e;
}
const processes = [];
const gatherStderr = new stream.PassThrough();
gatherStderr.setEncoding('utf8');
gatherStderr.setMaxListeners(Infinity);
let finished = false;
function spawnProcesses() {
for (let i = 0; i < 10; ++i) {
const proc = child_process.spawn(
process.execPath,
[ '-e',
`process.chdir(${JSON.stringify(__dirname)});
for (const file of fs.readdirSync('.'))
fs.watch(file, () => {});`
], { stdio: ['inherit', 'inherit', 'pipe'] });
proc.stderr.pipe(gatherStderr);
processes.push(proc);
}
setTimeout(() => {
if (!finished && processes.length < 200)
spawnProcesses();
}, 100);
}
spawnProcesses();
let accumulated = '';
gatherStderr.on('data', common.mustCallAtLeast((chunk) => {
accumulated += chunk;
if (accumulated.includes('Error:') && !finished) {
assert(
accumulated.includes('ENOSPC: System limit for number ' +
'of file watchers reached') ||
accumulated.includes('EMFILE: '),
accumulated);
console.log(`done after ${processes.length} processes, cleaning up`);
finished = true;
processes.forEach((proc) => proc.kill());
}
}, 1));
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