56 lines
1.2 KiB
JavaScript
56 lines
1.2 KiB
JavaScript
const spawn = require('child_process').spawn;
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module.exports = { tree, pidsForTree, getStat };
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function getStat() {
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return new Promise(resolve => {
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const command = `ls /proc | grep -E '^[0-9]+$' | xargs -I{} cat /proc/{}/stat`;
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const child = spawn('sh', ['-c', command], {
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stdio: ['pipe', 'pipe', 'pipe'],
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});
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var res = '';
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child.stdout.on('data', data => (res += data));
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child.on('close', () => resolve(res));
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});
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}
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function template(s) {
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var stat = null;
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// 'pid', 'comm', 'state', 'ppid', 'pgrp'
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// %d (%s) %c %d %d
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s.replace(
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/(\d+) \((.*?)\)\s(.+?)\s(\d+)\s/g,
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(all, PID, COMMAND, STAT, PPID) => {
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stat = { PID, COMMAND, PPID, STAT };
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}
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);
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return stat;
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}
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function tree(stats) {
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const processes = stats
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.split('\n')
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.map(template)
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.filter(Boolean);
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return processes;
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}
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function pidsForTree(tree, pid) {
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if (typeof pid === 'number') {
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pid = pid.toString();
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}
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const parents = [pid];
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const children = [];
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tree.forEach(proc => {
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if (parents.indexOf(proc.PPID) !== -1) {
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parents.push(proc.PID);
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children.push(proc);
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}
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});
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return children;
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}
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