int killDb(int port, ProcessId _pid, int signal, const BSONObj& opt) {
    ProcessId pid;
    int exitCode = 0;
    if (port > 0) {
        if (!registry.isPortRegistered(port)) {
            log() << "No db started on port: " << port << endl;
            return 0;
        }
        pid = registry.pidForPort(port);
    } else {
        pid = _pid;
    }

    kill_wrapper(pid, signal, port, opt);

    int i = 0;
    for (; i < 130; ++i) {
        if (i == 60) {
            log() << "process on port " << port << ", with pid " << pid
                  << " not terminated, sending sigkill" << endl;
            kill_wrapper(pid, SIGKILL, port, opt);
        }
        if (wait_for_pid(pid, false, &exitCode))
            break;
        sleepmillis(1000);
    }
    if (i == 130) {
        log() << "failed to terminate process on port " << port << ", with pid " << pid << endl;
        verify("Failed to terminate process" == 0);
    }

    registry.deleteProgram(pid);
    // FIXME I think the intention here is to do an extra sleep only when SIGKILL is sent to the
    // child process. We may want to change the 4 below to 29, since values of i greater than that
    // indicate we sent a SIGKILL.
    if (i > 4 || signal == SIGKILL) {
        sleepmillis(4000);  // allow operating system to reclaim resources
    }

    return exitCode;
}