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node_modules/pidtree/lib/ps.js

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+import {run as defaultRun} from './bin.js';
+import {parse} from './parse.js';
+
+/**
+ * Gets the list of all the pids of the system through the ps command.
+ * @param {Function} callback callback(err, list)
+ * @param {Function} [run] Injectable spawner, used for testing.
+ */
+export function ps(callback, run = defaultRun) {
+  // Example of stdout
+  //
+  // PPID   PID
+  //    1   430
+  //  430   432
+  run('ps', ['-A', '-o', 'ppid,pid'], (error, stdout, code) => {
+    if (error) {
+      callback(error);
+      return;
+    }
+
+    if (code !== 0) {
+      callback(new Error('pidtree ps command exited with code ' + code));
+      return;
+    }
+
+    try {
+      callback(null, parse(stdout));
+    } catch (error) {
+      callback(error);
+    }
+  });
+}