extern int connection_max_messages;/* Max down one SMTP connection */
extern BOOL config_changed; /* True if -C used */
extern FILE *config_file; /* Configuration file */
-extern uschar *config_filename; /* Configuration file name */
+extern const uschar *config_filename; /* Configuration file name */
extern gid_t config_gid; /* Additional group owner */
extern int config_lineno; /* Line number */
extern uschar *config_main_filelist; /* List of possible config files */
extern BOOL synchronous_delivery; /* TRUE if -odi is set */
extern BOOL syslog_duplication; /* FALSE => no duplicate logging */
extern int syslog_facility; /* As defined by Syslog.h */
+extern BOOL syslog_pid; /* TRUE if PID on syslogs */
extern uschar *syslog_processname; /* 'ident' param to openlog() */
extern BOOL syslog_timestamp; /* TRUE if time on syslogs */
extern uschar *system_filter; /* Name of system filter file */