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#ifndef DAEMON_HH
#define DAEMON_HH
#include <memory>
class Logger;
class Daemon {
public:
virtual ~Daemon() = default;
// Method is called after forking;
// if it returns true then parent process will detach and return success and
// run is executed.
// if it returns false then parent process will exit in failure and run is
// never executed.
// Anything logged to logger will write to calling logger regardless of return
// value.
// Note that stdin, stdout and stderr are all closed when this runs, you
// must use logger object if you want to output anything.
// Current directory is not modified.
virtual bool setup(Logger* logger) = 0;
// Method is called after forking and only after setup returns true.
// Note that stdin, stdout and stderr are all closed when this runs.
// Current directory is changed to root.
virtual bool run() = 0;
// Forks, runs setup() method before returning true or false.
// If setup() returns true then so does this method and run() is called.
// If setup() returns false then so does this method and run() is never
// called.
static bool fork_in_background(Logger* logger,
std::unique_ptr<Daemon> daemon);
// Doesn't fork, just runs setup() and if it returns true then
// also run() and waits for it to return.
static bool run_in_foreground(Logger* logger,
std::unique_ptr<Daemon> daemon);
protected:
Daemon() = default;
};
#endif // DAEMON_HH
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