Function isProcessRunning

src/utils/nativeInstaller/pidLock.ts:82–95

(pid: number)

 * Uses signal 0 which doesn't actually send a signal but checks if we can
 */
export function isProcessRunning(pid: number): boolean {
  // PID 0 is special - it refers to the current process group, not a real process
  // PID 1 is init/systemd and is always running but shouldn't be considered for locks
  if (pid <= 1) {
    return false
  }

  try {
    process.kill(pid, 0)
    return true
  } catch {
    return false
  }
}

/**
 * Validate that a running process is actually a Claude process