+/* Translate symbols into human readable strings. */
+const char *cb_host_str_syscall (host_callback *, int);
+const char *cb_host_str_errno (host_callback *, int);
+const char *cb_host_str_signal (host_callback *, int);
+const char *cb_target_str_syscall (host_callback *, int);
+const char *cb_target_str_errno (host_callback *, int);
+const char *cb_target_str_signal (host_callback *, int);
+