int emu_do_ioctl(int fd, int request, void *argp);
int emu_read_gpiodev(void *buf, int count);
void *emu_do_fopen(const char *path, const char *mode);
int emu_do_system(const char *command);
int emu_do_ioctl(int fd, int request, void *argp);
int emu_read_gpiodev(void *buf, int count);
void *emu_do_fopen(const char *path, const char *mode);
int emu_do_system(const char *command);