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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <unistd.h>
#include <limits.h>

char *ctermid(char *s)
{
	static char *s2;
	int fd;
	if (!s) {
		if (!s2) s2 = malloc(L_ctermid);
		s = s2;
	}
	fd = open("/dev/tty", O_WRONLY | O_NOCTTY);
	if (fd < 0)
		return strcpy(s, "");
	if (ttyname_r(fd, s, L_ctermid))
		strcpy(s, "");
	close(fd);
	return s;
}