fd_event_handler.h

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// Copyright (C) 2025 Internet Systems Consortium, Inc. ("ISC")
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
#ifndef FD_EVENT_HANDLER_H
#define FD_EVENT_HANDLER_H
 
#include <boost/shared_ptr.hpp>
#include <stdint.h>
 
namespace isc {
namespace util {

class FDEventHandler {
public:
    enum HandlerType : uint16_t {
        TYPE_UNKNOWN = 0,
        TYPE_SELECT = 1,
        TYPE_POLL = 2,
    };

    FDEventHandler(HandlerType type = TYPE_UNKNOWN);

    virtual ~FDEventHandler() = default;

    virtual void add(int fd) = 0;

    virtual int waitEvent(uint32_t timeout_sec, uint32_t timeout_usec = 0,
                          bool use_timeout = true) = 0;

    virtual bool readReady(int fd) = 0;

    virtual bool hasError(int fd) = 0;

    virtual void clear() = 0;

    HandlerType type();
 
private:
    HandlerType type_;
};

typedef boost::shared_ptr<FDEventHandler> FDEventHandlerPtr;
 
}  // namespace isc::util
}  // namespace isc
 
#endif  // FD_EVENT_HANDLER_H