kbhit() for NIOS terminal

I need an implementation of kbhit() for the nios terminal in eclipse. I found the following example

# include <termios.h>

int kbhit(void)

{

struct termios term, oterm;

int fd = 0;

int c = 0;

tcgetattr(fd, &oterm);

memcpy(&term, &oterm, sizeof(term));

}

i tried but i got an error, so i insertet the function "tcgetattr" directly

# include <termios.h># include <sys/ioctl.h>

int

tcgetattr(int fd,struct termios *termios_p)

{

return ioctl(fd,TCGETS,termios_p);

}

-> Now i have the problem, that he can&#39;t find "TCGETS" !! it seems to be defined nowhere ?????