.

qwen/nodejs/node_modules/pstree.remy/lib/utils.js

@@ -0,0 +1,53 @@
+const spawn = require('child_process').spawn;
+
+module.exports = { tree, pidsForTree, getStat };
+
+function getStat() {
+  return new Promise((resolve) => {
+    const command = `ls /proc | grep -E '^[0-9]+$' | xargs -I{} cat /proc/{}/stat`;
+    const spawned = spawn('sh', ['-c', command], {
+      stdio: ['pipe', 'pipe', 'pipe'],
+    });
+
+    var res = '';
+    spawned.stdout.on('data', (data) => (res += data));
+    spawned.on('close', () => resolve(res));
+  });
+}
+
+function template(s) {
+  var stat = null;
+  // 'pid', 'comm', 'state', 'ppid', 'pgrp'
+  // %d     (%s)    %c       %d      %d
+  s.replace(
+    /(\d+) \((.*?)\)\s(.+?)\s(\d+)\s/g,
+    (all, PID, COMMAND, STAT, PPID) => {
+      stat = { PID, COMMAND, PPID, STAT };
+    }
+  );
+
+  return stat;
+}
+
+function tree(stats) {
+  const processes = stats.split('\n').map(template).filter(Boolean);
+
+  return processes;
+}
+
+function pidsForTree(tree, pid) {
+  if (typeof pid === 'number') {
+    pid = pid.toString();
+  }
+  const parents = [pid];
+  const pids = [];
+
+  tree.forEach((proc) => {
+    if (parents.indexOf(proc.PPID) !== -1) {
+      parents.push(proc.PID);
+      pids.push(proc);
+    }
+  });
+
+  return pids;
+}