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// Copyright (C) 2021 The Android Open Source Project
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#pragma once
#include <dirent.h>
#include <fcntl.h>
#include <sys/param.h>
#include <sys/stat.h>
#include <unistd.h>
#include <cstdint>
#include <string>
namespace dittosuite {
class SyscallInterface {
public:
virtual ~SyscallInterface() {}
virtual int Access(const std::string& path_name, int mode) = 0;
virtual int Close(int fd) = 0;
virtual int CloseDir(DIR* dirp) = 0;
virtual int FAdvise(int fd, int64_t offset, int64_t len, int advice) = 0;
virtual int FAllocate(int fd, int mode, int64_t offset, int64_t len) = 0;
virtual int FTruncate(int fd, int64_t length) = 0;
virtual int FStat(int filedes, struct stat64* buf) = 0;
virtual int FSync(int fd) = 0;
virtual int Open(const std::string& path_name, int flags, int mode) = 0;
virtual DIR* OpenDir(const std::string& name) = 0;
virtual int64_t Read(int fd, char* buf, int64_t count, int64_t offset) = 0;
virtual struct dirent* ReadDir(DIR* dirp) = 0;
virtual int64_t ReadLink(const std::string& path_name, char* buf, int64_t bufsiz) = 0;
virtual void Sync() = 0;
virtual int Unlink(const std::string& path_name) = 0;
virtual int64_t Write(int fd, char* buf, int64_t count, int64_t offset) = 0;
};
class Syscall : public SyscallInterface {
public:
Syscall(Syscall& other) = delete;
void operator=(const Syscall&) = delete;
static Syscall& GetSyscall();
int Access(const std::string& path_name, int mode) override;
int Close(int fd) override;
int CloseDir(DIR* dirp) override;
int FAdvise(int fd, int64_t offset, int64_t len, int advice) override;
int FAllocate(int fd, int mode, int64_t offset, int64_t len) override;
int FTruncate(int fd, int64_t length) override;
int FStat(int filedes, struct stat64* buf) override;
int FSync(int fd) override;
int Open(const std::string& path_name, int flags, int mode) override;
DIR* OpenDir(const std::string& name) override;
int64_t Read(int fd, char* buf, int64_t count, int64_t offset) override;
struct dirent* ReadDir(DIR* dirp) override;
int64_t ReadLink(const std::string& path_name, char* buf, int64_t bufsiz) override;
void Sync() override;
int Unlink(const std::string& path_name) override;
int64_t Write(int fd, char* buf, int64_t count, int64_t offset) override;
private:
Syscall(){};
};
} // namespace dittosuite
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