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/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
* Copyright (C) 2019, Google Inc.
*
* v4l2_compat_manager.h - V4L2 compatibility manager
*/
#ifndef __V4L2_COMPAT_MANAGER_H__
#define __V4L2_COMPAT_MANAGER_H__
#include <fcntl.h>
#include <map>
#include <memory>
#include <sys/mman.h>
#include <sys/types.h>
#include <vector>
#include <libcamera/camera_manager.h>
#include "v4l2_camera_proxy.h"
using namespace libcamera;
class V4L2CompatManager
{
public:
struct FileOperations {
using openat_func_t = int (*)(int dirfd, const char *path,
int oflag, ...);
using dup_func_t = int (*)(int oldfd);
using close_func_t = int (*)(int fd);
using ioctl_func_t = int (*)(int fd, unsigned long request, ...);
using mmap_func_t = void *(*)(void *addr, size_t length, int prot,
int flags, int fd, off64_t offset);
using munmap_func_t = int (*)(void *addr, size_t length);
openat_func_t openat;
dup_func_t dup;
close_func_t close;
ioctl_func_t ioctl;
mmap_func_t mmap;
munmap_func_t munmap;
};
static V4L2CompatManager *instance();
const FileOperations &fops() const { return fops_; }
int openat(int dirfd, const char *path, int oflag, mode_t mode);
int dup(int oldfd);
int close(int fd);
void *mmap(void *addr, size_t length, int prot, int flags,
int fd, off64_t offset);
int munmap(void *addr, size_t length);
int ioctl(int fd, unsigned long request, void *arg);
private:
V4L2CompatManager();
~V4L2CompatManager();
int start();
int getCameraIndex(int fd);
std::shared_ptr<V4L2CameraFile> cameraFile(int fd);
FileOperations fops_;
CameraManager *cm_;
std::vector<std::unique_ptr<V4L2CameraProxy>> proxies_;
std::map<int, std::shared_ptr<V4L2CameraFile>> files_;
std::map<void *, V4L2CameraProxy *> mmaps_;
};
#endif /* __V4L2_COMPAT_MANAGER_H__ */
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