Function stop

programs/install/Install.cpp:684–743

    }

    int stop(const fs::path & pid_file, bool force)
    {
        UInt64 pid = isRunning(pid_file);

        if (!pid)
            return 0;

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

        if (0 == kill(pid, signal))
            fmt::print("Sent {} signal to process with pid {}.\n", signal_name, pid);
        else
            throwFromErrno(fmt::format("Cannot send {} signal", signal_name), ErrorCodes::SYSTEM_ERROR);

        size_t try_num = 0;
        constexpr size_t num_tries = 60;
        for (; try_num < num_tries; ++try_num)
        {
            fmt::print("Waiting for server to stop\n");
            if (!isRunning(pid_file))
            {
                fmt::print("Server stopped\n");
                break;
            }
            sleepForSeconds(1);
        }

        if (try_num == num_tries)
        {
            fmt::print("Will terminate forcefully.\n", pid);
            if (0 == kill(pid, 9))
                fmt::print("Sent kill signal.\n", pid);
            else
                throwFromErrno("Cannot send kill signal", ErrorCodes::SYSTEM_ERROR);

            /// Wait for the process (100 seconds).
            constexpr size_t num_kill_check_tries = 1000;
            constexpr size_t kill_check_delay_ms = 100;
            for (size_t i = 0; i < num_kill_check_tries; ++i)
            {
                fmt::print("Waiting for server to be killed\n");
                if (!isRunning(pid_file))
                {
                    fmt::print("Server exited\n");
                    break;
                }
                sleepForMilliseconds(kill_check_delay_ms);
            }

            if (isRunning(pid_file))
            {
                throw Exception(ErrorCodes::CANNOT_KILL,
                    "The server process still exists after %zu ms",
                    num_kill_check_tries, kill_check_delay_ms);
            }
        }