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 <memory>
#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_;
    std::unique_ptr<EventNotifier> notifier_;
};
 
} /* namespace libcamera */