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/// Lock/pid file class. From Recoll

class Pidfile {

public:

    Pidfile(const std::string& path)  : m_path(path), m_fd(-1) {}

    ~Pidfile();

    /// Open/create the pid file.

    /// @return 0 if ok, > 0 for pid of existing process, -1 for other error.

    pid_t open();

    /// Write pid into the pid file

    /// @return 0 ok, -1 error

    int write_pid();

    /// Close the pid file (unlocks)

    int close();

    /// Delete the pid file

    int remove();

    const std::string& getreason() {return m_reason;}

private:

    std::string m_path;

    int    m_fd;

    std::string m_reason;

    pid_t read_pid();

    int flopen();

};