Index: uspace/lib/c/include/fibril.h
===================================================================
--- uspace/lib/c/include/fibril.h	(revision f35749ea567f56991e775945db2ae2ded40751e6)
+++ uspace/lib/c/include/fibril.h	(revision 7064e71fb59500fe3cad795c283fcc654d8cec8b)
@@ -74,4 +74,7 @@
 extern __noreturn void fibril_exit(long);
 
+/** Add a function to be called after fibril exits, just before it is destroyed */
+extern errno_t fibril_add_exit_hook(void (*)(void));
+
 __HELENOS_DECLS_END;