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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;
}
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