extern void tls_close(void *, int);
extern BOOL tls_could_read(void);
extern void tls_daemon_init(void);
-extern int tls_export_cert(uschar *, size_t, void *);
+extern BOOL tls_export_cert(uschar *, size_t, void *);
extern int tls_feof(void);
extern int tls_ferror(void);
extern void tls_free_cert(void **);