Function clearStaleDaemonLock

src/mcp/daemon.ts:642–659

(pidPath: string, expectedDeadPid?: number)

 * pid. Returns true when the stale lock is gone (or was already gone).
 */
export function clearStaleDaemonLock(pidPath: string, expectedDeadPid?: number): boolean {
  try {
    const raw = fs.readFileSync(pidPath, 'utf8');
    const info = decodeLockInfo(raw);
    if (info) {
      // A different pid took over since we read it — not ours to clear.
      if (expectedDeadPid !== undefined && info.pid !== expectedDeadPid) return false;
      // Holder is actually alive — never clear a live daemon's lock.
      if (info.pid > 0 && isProcessAlive(info.pid)) return false;
    }
    fs.unlinkSync(pidPath);
    return true;
  } catch (err: unknown) {
    const e = err as NodeJS.ErrnoException;
    if (e.code === 'ENOENT') return true; // already gone
    return false;
  }
}

/**
 * Probe whether `pid` is currently alive (signal-0). Treats EPERM as alive on