diff --git a/run/abuse.run b/run/abuse.run
index 8275475..5d70693 100644
--- a/run/abuse.run
+++ b/run/abuse.run
@@ -128,6 +128,7 @@ set boot_modules {
 	ld.lib.so
 	libc.lib.so
 	libm.lib.so
+	posix.lib.so
 	libpng.lib.so
 	pthread.lib.so
 	sdl_image.lib.so
diff --git a/run/chocolate-doom.run b/run/chocolate-doom.run
index 169a22e..2e2b307 100644
--- a/run/chocolate-doom.run
+++ b/run/chocolate-doom.run
@@ -188,7 +188,7 @@ set boot_modules {
 	core init timer tar_fs
 	chocolate-doom
 	ld.lib.so
-	libc.lib.so libm.lib.so sdl.lib.so sdl_net.lib.so
+	libc.lib.so posix.lib.so libm.lib.so sdl.lib.so sdl_net.lib.so
 	sdl_mixer.lib.so pthread.lib.so
 	data.tar
 }
diff --git a/run/chroot.run b/run/chroot.run
index ffc0662..49da752 100644
--- a/run/chroot.run
+++ b/run/chroot.run
@@ -112,7 +112,7 @@ install_config $config
 
 build_boot_image {
 	core init vfs chroot
-	ld.lib.so libc.lib.so libm.lib.so
+	ld.lib.so libc.lib.so libm.lib.so posix.lib.so
 	test-libc
 }
 
diff --git a/run/eigentor.run b/run/eigentor.run
index b0c832d..71c0a3d 100644
--- a/run/eigentor.run
+++ b/run/eigentor.run
@@ -200,6 +200,7 @@ set boot_modules {
 	init
 	ld.lib.so
 	libc.lib.so
+	posix.lib.so
 	libcrypto.lib.so
 	libevent.lib.so
 	libm.lib.so
diff --git a/run/glucose.run b/run/glucose.run
index 132d2f6..71a2f50 100644
--- a/run/glucose.run
+++ b/run/glucose.run
@@ -75,10 +75,7 @@ install_config $config
 
 build_boot_image {
 	core init test-glucose timer
-	ld.lib.so libc.lib.so
-	libm.lib.so
-	stdcxx.lib.so
-	zlib.lib.so
+	ld.lib.so libc.lib.so posix.lib.so libm.lib.so stdcxx.lib.so zlib.lib.so
 	Test.cnf
 }
 
diff --git a/run/grafx2.run b/run/grafx2.run
index 0f11510..5769bc4 100644
--- a/run/grafx2.run
+++ b/run/grafx2.run
@@ -119,6 +119,7 @@ set boot_modules {
 	ld.lib.so
 	libc.lib.so
 	libm.lib.so
+	posix.lib.so
 	libpng.lib.so
 	pthread.lib.so
 	sdl_image.lib.so
diff --git a/run/lemon.run b/run/lemon.run
index d26ac21..2e03cd1 100644
--- a/run/lemon.run
+++ b/run/lemon.run
@@ -31,9 +31,7 @@ install_config {
 
 build_boot_image {
 	core init test-lemon
-	ld.lib.so libc.lib.so
-	libm.lib.so
-	stdcxx.lib.so
+	ld.lib.so libc.lib.so posix.lib.so libm.lib.so stdcxx.lib.so
 }
 
 append qemu_args " -nographic  "
diff --git a/run/ltris.run b/run/ltris.run
index 22f31c1..1633dd2 100644
--- a/run/ltris.run
+++ b/run/ltris.run
@@ -30,6 +30,7 @@ set boot_modules {
 	ram_fs
 	ltris
 	libc.lib.so
+	posix.lib.so
 	libm.lib.so
 	pthread.lib.so
 	sdl_mixer.lib.so
diff --git a/run/numptyphysics.run b/run/numptyphysics.run
index 49c6305..a5b69de 100644
--- a/run/numptyphysics.run
+++ b/run/numptyphysics.run
@@ -29,6 +29,7 @@ set boot_modules {
 	freetype.lib.so
 	jpeg.lib.so
 	libc.lib.so
+	posix.lib.so
 	libm.lib.so
 	libpng.lib.so
 	pthread.lib.so
diff --git a/run/rom_fallback.run b/run/rom_fallback.run
index 76e68eb..0f8adeb 100644
--- a/run/rom_fallback.run
+++ b/run/rom_fallback.run
@@ -76,8 +76,7 @@ install_config $config
 # generic modules
 set boot_modules {
 	core init ld.lib.so
-	libc.lib.so
-	libm.lib.so
+	libc.lib.so libm.lib.so posix.lib.so
 	report_rom
 	rom_fallback
 	test-libc
diff --git a/run/scip.run b/run/scip.run
index a2d6af5..05f319e 100644
--- a/run/scip.run
+++ b/run/scip.run
@@ -34,7 +34,7 @@ install_config {
 
 build_boot_image {
 	core init test-scip
-	ld.lib.so libc.lib.so libm.lib.so
+	ld.lib.so libc.lib.so libm.lib.so posix.lib.so
 	stdcxx.lib.so soplex.lib.so zlib.lib.so gmp.lib.so scip.lib.so
 }
 
diff --git a/run/soplex.run b/run/soplex.run
index 0854868..51bc5ee 100644
--- a/run/soplex.run
+++ b/run/soplex.run
@@ -31,7 +31,7 @@ install_config {
 
 build_boot_image {
 	core init test-soplex
-	ld.lib.so libc.lib.so libm.lib.so
+	ld.lib.so libc.lib.so libm.lib.so posix.lib.so
 	stdcxx.lib.so soplex.lib.so zlib.lib.so gmp.lib.so
 }
 
diff --git a/run/supertux.run b/run/supertux.run
index 52b7471..d267c07 100644
--- a/run/supertux.run
+++ b/run/supertux.run
@@ -26,6 +26,7 @@ set boot_modules {
 	supertux
 	jpeg.lib.so
 	libc.lib.so
+	posix.lib.so
 	libm.lib.so
 	libpng.lib.so
 	pthread.lib.so
diff --git a/run/tor_lx.run b/run/tor_lx.run
index b67cde2..51cceeb 100644
--- a/run/tor_lx.run
+++ b/run/tor_lx.run
@@ -132,7 +132,7 @@ install_config $config
 # generic modules
 set boot_modules {
 	core init timer rtc_drv
-	ld.lib.so libc.lib.so libm.lib.so zlib.lib.so
+	ld.lib.so libc.lib.so libm.lib.so zlib.lib.so posix.lib.so
 	libcrypto.lib.so libevent.lib.so libssl.lib.so pthread.lib.so
 	vfs_jitterentropy.lib.so lwip.lib.so
 	nic_drv ram_fs tor
diff --git a/run/tuxmath.run b/run/tuxmath.run
index 9c88996..f71bb2b 100644
--- a/run/tuxmath.run
+++ b/run/tuxmath.run
@@ -16,6 +16,7 @@ set app_config {
 set boot_modules {
 	tuxmath
 	libc.lib.so
+	posix.lib.so
 	libm.lib.so
 	pthread.lib.so
 	libiconv.lib.so
diff --git a/run/tyrian.run b/run/tyrian.run
index 4e068f3..20a7c15 100644
--- a/run/tyrian.run
+++ b/run/tyrian.run
@@ -127,6 +127,7 @@ append boot_modules {
 	ld.lib.so
 	libc.lib.so
 	libm.lib.so
+	posix.lib.so
 	libpng.lib.so
 	pthread.lib.so
 	posix.lib.so
diff --git a/run/tyrquake.run b/run/tyrquake.run
index d90a287..0e7b6f3 100644
--- a/run/tyrquake.run
+++ b/run/tyrquake.run
@@ -233,4 +233,4 @@ append qemu_args "  -soundhw es1370 "
 
 run_genode_until forever
 
-rm bin/variables
\ No newline at end of file
+rm bin/variables
diff --git a/run/uhexen2.run b/run/uhexen2.run
index 31e53e2..7676b13 100644
--- a/run/uhexen2.run
+++ b/run/uhexen2.run
@@ -183,7 +183,7 @@ set boot_modules {
 	usb_drv
 	uhexen2
 	ld.lib.so
-	libc.lib.so
+	libc.lib.so posix.lib.so
 	libm.lib.so lwip.lib.so sdl.lib.so sdl_mixer.lib.so pthread.lib.so
 	hexen2demo_data.tar
 }
diff --git a/src/proxy/rom_verify/main.cc b/src/proxy/rom_verify/main.cc
index 50cd8b1..10796c1 100644
--- a/src/proxy/rom_verify/main.cc
+++ b/src/proxy/rom_verify/main.cc
@@ -242,7 +242,6 @@ void Rom_hash::Main::handle_session_request(Xml_node request)
 
 			String<64> args("ram_quota=", ram_quota);
 
-			// XXX handle Root::Invalid_args
 			env.upgrade(session.client_id.id(), args.string());
 			env.parent().session_response(server_id, Parent::SESSION_OK);
 		});
diff --git a/src/server/chroot/component.cc b/src/server/chroot/component.cc
index 2ee9d4b..553a4f6 100644
--- a/src/server/chroot/component.cc
+++ b/src/server/chroot/component.cc
@@ -233,7 +233,7 @@ void Chroot::Main::handle_session_request(Xml_node request)
 		catch (...) {
 			if (session)
 				destroy(heap, session);
-			env.parent().session_response(server_id, Parent::INVALID_ARGS);
+			env.parent().session_response(server_id, Parent::SERVICE_DENIED);
 		}
 	}
 
@@ -245,7 +245,6 @@ void Chroot::Main::handle_session_request(Xml_node request)
 
 			String<64> args("ram_quota=", ram_quota);
 
-			// XXX handle Root::Invalid_args
 			env.upgrade(session.client_id.id(), args.string());
 			env.parent().session_response(server_id, Parent::SESSION_OK);
 		});
diff --git a/src/server/log_tee/component.cc b/src/server/log_tee/component.cc
index f464419..20fc41f 100644
--- a/src/server/log_tee/component.cc
+++ b/src/server/log_tee/component.cc
@@ -75,9 +75,7 @@ class Log_tee::Root_component :
 		Log_tee::Session_component *_create_session(char const *args) override
 		{
 			Session_label const label = label_from_args(args);
-
-			try { return new (md_alloc()) Session_component(_env, label, args); }
-			catch (Genode::Parent::Service_denied) { throw Root::Unavailable(); }
+			return new (md_alloc()) Session_component(_env, label, args);
 		}
 
 	public:
diff --git a/src/server/lz_rom/main.cc b/src/server/lz_rom/main.cc
index 56a1f14..d904f88 100644
--- a/src/server/lz_rom/main.cc
+++ b/src/server/lz_rom/main.cc
@@ -307,7 +307,7 @@ void Lz_rom::Main::handle_session_request(Xml_node request)
 			}
 			error("failed to decompress '", lz_path, "', ", msg);
 		} catch (...) { }
-		env.parent().session_response(server_id, Parent::INVALID_ARGS);
+		env.parent().session_response(server_id, Parent::SERVICE_DENIED);
 	}
 
 	if (request.has_type("close")) {
diff --git a/src/server/rom_fallback/component.cc b/src/server/rom_fallback/component.cc
index 270e622..f01720a 100644
--- a/src/server/rom_fallback/component.cc
+++ b/src/server/rom_fallback/component.cc
@@ -167,35 +167,32 @@ void Rom_fallback::Main::handle_session_request(Xml_node request)
 				return;
 			}
 
-			catch (Parent::Service_denied) {
+			catch (Service_denied) {
 				warning("'", new_label, "' was denied"); }
 
-			catch (Service::Unavailable) {
-				warning("'", new_label, "' is unavailable"); }
+			catch (Insufficient_ram_quota) {
+				warning("'", new_label, "' RAM quota donation was insufficient"); }
 
-			catch (Service::Invalid_args)   {
-				warning("'", new_label, "' received invalid args"); }
-
-			catch (Service::Quota_exceeded) {
-				warning("'", new_label, "' quota donation was insufficient"); }
+			catch (Insufficient_cap_quota) {
+				warning("'", new_label, "' cap quota donation was insufficient"); }
 
 			if (session)
 				destroy(heap, session);
 		}
 
 		error("no service found for ROM '", original.string(), "'");
-		env.parent().session_response(server_id, Parent::INVALID_ARGS);
+		env.parent().session_response(server_id, Parent::SERVICE_DENIED);
 	}
 
 	if (request.has_type("upgrade")) {
 
 		server_id_space.apply<Session>(server_id, [&] (Session &session) {
 
-			size_t ram_quota = request.attribute_value("ram_quota", 0UL);
+			Ram_quota ram_quota { request.attribute_value("ram_quota", 0UL) };
+			Cap_quota cap_quota { request.attribute_value("cap_quota", 0UL) };
 
-			String<64> args("ram_quota=", ram_quota);
+			String<80> args("ram_quota=", ram_quota, ", cap_quota=", cap_quota);
 
-			// XXX handle Root::Invalid_args
 			env.upgrade(session.client_id.id(), args.string());
 			env.parent().session_response(server_id, Parent::SESSION_OK);
 		});
@@ -217,4 +214,4 @@ void Component::construct(Genode::Env &env)
 	static Rom_fallback::Main inst(env);
 
 	env.parent().announce("ROM");
-}
\ No newline at end of file
+}
diff --git a/src/server/tftp_rom/component.cc b/src/server/tftp_rom/component.cc
index e65915b..bb7289e 100644
--- a/src/server/tftp_rom/component.cc
+++ b/src/server/tftp_rom/component.cc
@@ -142,7 +142,7 @@ class Tftp_rom::Session_component :
 		{
 			if (_pcb == NULL) {
 				Genode::error("failed to create UDP context");
-				throw Genode::Root::Unavailable();
+				throw Genode::Service_denied();
 			}
 
 			/* set callback */
@@ -477,7 +477,7 @@ class Tftp_rom::Root : public Genode::Root_component<Session_component>
 					ipaddr_aton(addr_str, &ipaddr);
 				} catch (...) {
 					Genode::error(label.string(), ": 'ip' not specified in policy");
-					throw Root::Unavailable();
+					throw Service_denied();
 				}
 
 				try { policy.attribute("port").value(&port); }
@@ -503,10 +503,10 @@ class Tftp_rom::Root : public Genode::Root_component<Session_component>
 						                  _timeout_dispatcher.elapsed_ms(), timeout*1000);
 					Genode::log(label.string(), " requested");
 				}
-
-			} catch (Session_policy::No_policy_defined) {
+			}
+			catch (Session_policy::No_policy_defined) {
 				Genode::error("no policy for defined for ", label.string());
-				throw Root::Unavailable();
+				throw Service_denied();
 			}
 
 			_timeout_dispatcher.insert(session);
@@ -531,7 +531,7 @@ class Tftp_rom::Root : public Genode::Root_component<Session_component>
 };
 
 
-void Libc::Component::construct(Genode::Env &env )
+void Libc::Component::construct(Libc::Env &env )
 {
 	static Genode::Sliced_heap sliced_heap(env.ram(), env.rm());
 	static Tftp_rom::Root root(env, sliced_heap);