Program Listing for File Syscalls.h

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/*
 * Copyright 2025 Google LLC
 *
 * 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 <fcntl.h>
#include <keyutils.h>
#include <unistd.h>
#include <sys/ipc.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <sys/msg.h>
#include <sys/socket.h>
#include <string>

typedef int fd;

typedef fd pipefds[2];

class Syscalls {
    static void __check(int result, int expected = 0,
                        const char* syscall_name = __builtin_FUNCTION());

    template <typename T>
    static T __check_valid(T result,
                            const char* syscall_name = __builtin_FUNCTION());

public:
    static int open(const char* file, int oflag);

    static void read(fd fd, void* buf, size_t n);

    static void write(fd fd, const void* buf, size_t n);

    static int ioctl(int fd, unsigned long int request, void* arg);

    static void close(fd fd);

    static void pipe(pipefds pipefds);

    static struct stat stat(const char* path);

    static void unshare(int flags);

    static std::string readlink(const char* path, size_t bufsize = 256);
};