Index: uspace/lib/c/include/async.h
===================================================================
--- uspace/lib/c/include/async.h	(revision 086cab0912d0dce05b3404cdf8f5aa13ee5f45f0)
+++ uspace/lib/c/include/async.h	(revision 2d5a273729dddcf085d7498b3b8ec36194a5a2fb)
@@ -275,8 +275,8 @@
 
 extern async_sess_t *async_connect_me_to(async_exch_t *, iface_t, sysarg_t,
-    sysarg_t);
+    sysarg_t, errno_t *);
 extern async_sess_t *async_connect_me_to_blocking(async_exch_t *, iface_t,
-    sysarg_t, sysarg_t);
-extern async_sess_t *async_connect_kbox(task_id_t);
+    sysarg_t, sysarg_t, errno_t *);
+extern async_sess_t *async_connect_kbox(task_id_t, errno_t *);
 
 extern errno_t async_connect_to_me(async_exch_t *, iface_t, sysarg_t, sysarg_t);
Index: uspace/lib/c/include/loader/loader.h
===================================================================
--- uspace/lib/c/include/loader/loader.h	(revision 086cab0912d0dce05b3404cdf8f5aa13ee5f45f0)
+++ uspace/lib/c/include/loader/loader.h	(revision 2d5a273729dddcf085d7498b3b8ec36194a5a2fb)
@@ -44,5 +44,5 @@
 
 extern errno_t loader_spawn(const char *);
-extern loader_t *loader_connect(void);
+extern loader_t *loader_connect(errno_t *);
 extern errno_t loader_get_task_id(loader_t *, task_id_t *);
 extern errno_t loader_set_cwd(loader_t *);
Index: uspace/lib/c/include/ns.h
===================================================================
--- uspace/lib/c/include/ns.h	(revision 086cab0912d0dce05b3404cdf8f5aa13ee5f45f0)
+++ uspace/lib/c/include/ns.h	(revision 2d5a273729dddcf085d7498b3b8ec36194a5a2fb)
@@ -43,10 +43,11 @@
     void *);
 extern errno_t service_register_broker(service_t, async_port_handler_t, void *);
-extern async_sess_t *service_connect(service_t, iface_t, sysarg_t);
-extern async_sess_t *service_connect_blocking(service_t, iface_t, sysarg_t);
+extern async_sess_t *service_connect(service_t, iface_t, sysarg_t, errno_t *);
+extern async_sess_t *service_connect_blocking(service_t, iface_t, sysarg_t,
+    errno_t *);
 
 extern errno_t ns_ping(void);
 extern errno_t ns_intro(task_id_t);
-extern async_sess_t *ns_session_get(void);
+extern async_sess_t *ns_session_get(errno_t *);
 
 #endif