#include <stdio.h>
char *ctermid(char *s);
#include <stdio.h>
int main()
{
char buf[L_ctermid];
printf ("%s\n", ctermid(NULL));
char *p = ctermid(buf);
printf ("%s\n", buf);
printf ("%s\n", p);
return 0;
}
$ ./ctermid
/dev/tty
/dev/tty
/dev/tty
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