enum {
    O_RDONLY = 0,
    O_WRONLY = 1,
    O_CREAT = 64,
};

extern void _exit(int status);
extern int read(int fd, void* buf, int sz);
extern int write(int fd, void* buf, int sz);
extern int open(const char* path, int flags, int mode);
extern int close(int fd);
extern int lseek(int fd, int offset, int whence);


// 0 = stdin
// 1 = stdout
// 2 = stderr


void _start() {
    char buf[100];

    int fd = open("./clean", O_WRONLY | O_CREAT, 00666);

    lseek(fd, 16, 0);
    write(fd, &fd, 4);
    lseek(fd, 8, 0);

    int r = -1;
    write(fd, &r, 4);
    // if (fd < 0) {
    //     _exit(1);
    // }

    // int res = read(0, buf, 100);
    // write(fd, buf, res);

    close(fd);
    _exit(0);
}