extern pid_t child_open(uschar **, uschar **, int, int *, int *, BOOL);
extern pid_t child_open_exim(int *);
extern pid_t child_open_exim2(int *, uschar *, uschar *);
extern pid_t child_open(uschar **, uschar **, int, int *, int *, BOOL);
extern pid_t child_open_exim(int *);
extern pid_t child_open_exim2(int *, uschar *, uschar *);