Function stop

programs/install/Install.cpp:1204–1243

    }

    int stop(const fs::path & pid_file, bool force, bool do_not_kill, unsigned max_tries)
    {
        if (force && do_not_kill)
            throw Exception(ErrorCodes::BAD_ARGUMENTS, "Specified flags are incompatible");

        int signal = force ? SIGKILL : SIGTERM;
        const char * signal_name = force ? "kill" : "terminate";

        if (sendSignalAndWaitForStop(pid_file, signal, max_tries, 1000, signal_name))
            return 0;

        int pid = isRunning(pid_file, /*ignore_file_does_not_exist=*/ false);
        if (!pid)
            return 0;

        if (do_not_kill)
        {
            fmt::print("Process (pid = {}) is still running. Will not try to kill it.\n", pid);
            return 1;
        }

        /// Send termination signal again, the server will receive it and immediately terminate.
        fmt::print("Will send the termination signal again to force the termination (pid = {}).\n", pid);
        if (sendSignalAndWaitForStop(pid_file, signal, std::min(10U, max_tries), 1000, signal_name))
            return 0;

        /// Send kill signal. Total wait is 100 seconds.
        constexpr size_t num_kill_check_tries = 1000;
        constexpr size_t kill_check_delay_ms = 100;
        fmt::print("Will terminate forcefully (pid = {}).\n", pid);
        if (sendSignalAndWaitForStop(pid_file, SIGKILL, num_kill_check_tries, kill_check_delay_ms, "kill"))
            return 0;

        if (!isRunning(pid_file, /*ignore_file_does_not_exist=*/ true))
            return 0;

        throw Exception(ErrorCodes::CANNOT_KILL,
            "The server process still exists after {} tries (delay: {} ms)",
            num_kill_check_tries, kill_check_delay_ms);
    }
}