killTree static method

Implementation

static void killTree(int rootPid, {bool includeRoot = true}) {
  try {
    if (Platform.isWindows) {
      Process.runSync('taskkill', ['/PID', '$rootPid', '/T', '/F']);
      return;
    }
    final ps = Process.runSync('ps', ['-A', '-o', 'pid=,ppid=']);
    final children = <int, List<int>>{};
    for (final line in ps.stdout.toString().split('\n')) {
      final parts = line.trim().split(RegExp(r'\s+'));
      if (parts.length != 2) continue;
      final pid = int.tryParse(parts[0]);
      final ppid = int.tryParse(parts[1]);
      if (pid == null || ppid == null) continue;
      children.putIfAbsent(ppid, () => []).add(pid);
    }
    final order = <int>[];
    void visit(int pid) {
      for (final child in children[pid] ?? const <int>[]) {
        visit(child);
      }
      order.add(pid);
    }

    visit(rootPid);
    if (!includeRoot) order.remove(rootPid);
    for (final pid in order) {
      Process.killPid(pid, ProcessSignal.sigterm);
    }
  } catch (_) {
    Process.killPid(rootPid);
  }
}