#define TARGET_OS GIETVM

#if TARGET_OS==GIETVM
    #define printf(...)  giet_tty_printf(__VA_ARGS__)

    #define open(x, y)      giet_fat_open(x, y)
    #define close(x)        giet_fat_close(x)
    #define read(x, y, z)   giet_fat_read(x, y, z)
    #define write(x, y, z)  giet_fat_write(x, y, z)
    #define fprintf(x, ...) giet_fat_fprintf(x, __VA_ARGS__)
    #define exit(x)         giet_pthread_exit("exit...")
#endif