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ant/examples/npm/pidtree/index.js
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index.js
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import pidtree from 'pidtree';
import { spawn } from 'node:child_process';
async function run() {
console.log('1. Looking up own pid with pidtree...');
const self = process.pid;
const selfTree = await pidtree(self, { root: true });
if (!Array.isArray(selfTree) || !selfTree.includes(self)) {
console.log('FAIL — could not find own pid %d in tree: %o', self, selfTree);
process.exit(1);
}
console.log(' OK — found own pid %d in tree', self);
console.log('2. Spawning a child and looking it up...');
const child = spawn('sleep', ['10']);
const childPid = child.pid;
await new Promise(r => setTimeout(r, 100));
const childTree = await pidtree(self, { root: true });
if (!childTree.includes(childPid)) {
console.log('FAIL — child pid %d not found in tree: %o', childPid, childTree);
child.kill();
process.exit(1);
}
console.log(' OK — child pid %d found in tree', childPid);
console.log('3. Testing { root: false } excludes root...');
const noRoot = await pidtree(self);
if (noRoot.includes(self)) {
console.log('FAIL — root pid should be excluded');
child.kill();
process.exit(1);
}
if (!noRoot.includes(childPid)) {
console.log('FAIL — child pid %d not found without root: %o', childPid, noRoot);
child.kill();
process.exit(1);
}
console.log(' OK — root excluded, child present');
console.log('4. Testing { advanced: true } format...');
const advanced = await pidtree(self, { root: true, advanced: true });
const selfEntry = advanced.find(e => e.pid === self);
const childEntry = advanced.find(e => e.pid === childPid);
if (!selfEntry || !childEntry) {
console.log('FAIL — missing entries in advanced output: %o', advanced);
child.kill();
process.exit(1);
}
if (childEntry.ppid !== self) {
console.log('FAIL — child ppid should be %d, got %d', self, childEntry.ppid);
child.kill();
process.exit(1);
}
console.log(' OK — advanced format correct (child ppid=%d)', childEntry.ppid);
console.log('5. Testing pid -1 lists all pids...');
const all = await pidtree(-1);
if (!Array.isArray(all) || all.length < 2) {
console.log('FAIL — expected many pids, got %d', all ? all.length : 0);
child.kill();
process.exit(1);
}
console.log(' OK — got %d pids from system', all.length);
console.log('6. Testing stdio: "inherit" on inner spawn...');
const inheritChild = spawn('echo', ['hello'], { stdio: 'inherit' });
if (inheritChild.stdin !== null || inheritChild.stdout !== null || inheritChild.stderr !== null) {
console.log('FAIL — stdio streams should be null with inherit');
child.kill();
process.exit(1);
}
await new Promise(r => inheritChild.on('close', r));
console.log(' OK — inherited stdio, streams are null');
child.kill();
await new Promise(r => child.on('close', r));
console.log('\nAll good.');
}
run().catch(err => {
console.error('FAIL —', err.message);
process.exit(1);
});

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