/* tty.c */



#include <unistd.h>
#include <stdio.h>


/* tty */
static int _tty(void)
{
	if(isatty(0) == 1)
	{
		char * tty;

		if((tty = ttyname(0)) == NULL)
		{
			perror("ttyname");
			return 2;
		}
		printf("%s\n", tty);
		return 0;
	}
	printf("not a tty\n");
	return 2;
}


/* usage */
static int _usage(void)
{
	fprintf(stderr, "%s", "Usage: tty\n");
	return 1;
}


/* main */
int main(int argc, char * argv[])
{
	if(argc != 1)
		return _usage();
	return _tty();
}