extern pid_t wait_with_trace (int *, char *, int);
extern int open_with_trace (char *, int, char *, int);
extern int close_with_trace (int, char *, int);
extern pid_t wait_with_trace (int *, char *, int);
extern int open_with_trace (char *, int, char *, int);
extern int close_with_trace (int, char *, int);