ipc_unixsocket.h

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/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
 * Copyright (C) 2019, Google Inc.
 *
 * IPC mechanism based on Unix sockets
 */

#pragma once

#include <stdint.h>
#include <sys/types.h>
#include <vector>

#include <libcamera/base/signal.h>
#include <libcamera/base/unique_fd.h>

namespace libcamera {

class EventNotifier;

class IPCUnixSocket
{
public:
    struct Payload {
        std::vector<uint8_t> data;
        std::vector<int32_t> fds;
    };

    IPCUnixSocket();
    ~IPCUnixSocket();

    UniqueFD create();
    int bind(UniqueFD fd);
    void close();
    bool isBound() const;

    int send(const Payload &payload);
    int receive(Payload *payload);

    Signal<> readyRead;

private:
    struct Header {
        uint32_t data;
        uint8_t fds;
    };

    int sendData(const void *buffer, size_t length, const int32_t *fds, unsigned int num);
    int recvData(void *buffer, size_t length, int32_t *fds, unsigned int num);

    void dataNotifier();

    UniqueFD fd_;
    bool headerReceived_;
    struct Header header_;
    EventNotifier *notifier_;
};

} /* namespace libcamera */