Introduce server-role member to 'Child' class

This patch is needed to use children as services in a dynamic
way (closing and reopening sessions).

base/include/base/child.h

@@ -69,7 +69,8 @@ namespace Genode {
 		 */
 		virtual bool announce_service(const char            *name,
 		                              Root_capability        root,
-		                              Allocator             *alloc)
+		                              Allocator             *alloc,
+		                              Server                *server)
 		{ return false; }
 
 		/**
@@ -296,6 +297,9 @@ namespace Genode {
 			/* child policy */
 			Child_policy           *_policy;
 
+			/* server role */
+			Server                 _server;
+
 			/**
 			 * Session-argument buffer
 			 */
@@ -376,7 +380,8 @@ namespace Genode {
 				_entrypoint(entrypoint),
 				_parent_cap(_entrypoint->manage(this)),
 				_process(elf_ds, ram, cpu, rm, _parent_cap, policy->name(), 0),
-				_policy(policy)
+				_policy(policy),
+				_server(ram)
 			{ }
 
 			/**
@@ -437,7 +442,7 @@ namespace Genode {
 			{
 				if (!name.is_valid_string()) return;
 
-				_policy->announce_service(name.string(), root, heap());
+				_policy->announce_service(name.string(), root, heap(), &_server);
 			}
 
 			Session_capability session(Service_name const &name, Session_args const &args)

gems/src/server/d3m/block_service.h

@@ -92,7 +92,8 @@ class Iso9660_boot_probe
 
 		bool announce_service(char const             *service_name,
 		                      Genode::Root_capability root,
-		                      Genode::Allocator      *alloc)
+		                      Genode::Allocator      *alloc,
+		                      Genode::Server         *server)
 		{
 			if (Genode::strcmp(service_name, "ROM") != 0)
 				return false;

gems/src/server/d3m/main.cc

@@ -61,7 +61,8 @@ class Ipxe_policy : public Genode::Slave_policy, public Nic::Provider
 
 		bool announce_service(const char             *service_name,
 		                      Genode::Root_capability root,
-		                      Genode::Allocator      *alloc)
+		                      Genode::Allocator      *alloc,
+		                      Genode::Server         *server)
 		{
 			if (Genode::strcmp(service_name, "Nic"))
 				return false;
@@ -105,7 +106,8 @@ struct Ps2_policy : public Genode::Slave_policy
 
 		bool announce_service(const char             *service_name,
 		                      Genode::Root_capability root,
-		                      Genode::Allocator      *alloc)
+		                      Genode::Allocator      *alloc,
+		                      Genode::Server         *server)
 		{
 			if (Genode::strcmp(service_name, "Input"))
 				return false;
@@ -155,7 +157,8 @@ struct Usb_policy : public Genode::Slave_policy
 
 		bool announce_service(const char             *service_name,
 		                      Genode::Root_capability root,
-		                      Genode::Allocator      *alloc)
+		                      Genode::Allocator      *alloc,
+		                      Genode::Server         *server)
 		{
 			if (Genode::strcmp(service_name, "Input") == 0) {
 				_input_source_registry_entry.connect(root);
@@ -202,7 +205,8 @@ class Atapi_policy : public Genode::Slave_policy
 
 		bool announce_service(char const              *service_name,
 		                      Genode::Root_capability  root,
-		                      Genode::Allocator       *alloc)
+		                      Genode::Allocator       *alloc,
+		                      Genode::Server          *server)
 		{
 			if (Genode::strcmp(service_name, "Block"))
 				return false;

os/include/init/child.h

@@ -552,7 +552,8 @@ namespace Init {
 
 			bool announce_service(const char             *service_name,
 			                      Genode::Root_capability root,
-			                      Genode::Allocator      *alloc)
+			                      Genode::Allocator      *alloc,
+			                      Genode::Server         *server)
 			{
 				if (config_verbose)
 					Genode::printf("child \"%s\" announces service \"%s\"\n",

os/include/init/child_policy.h

@@ -309,7 +309,8 @@ namespace Init {
 
 			bool announce_service(const char              *service_name,
 			                      Genode::Root_capability  root,
-			                      Genode::Allocator       *alloc)
+			                      Genode::Allocator       *alloc,
+			                      Genode::Server          *server)
 			{
 				if (_child_services->find(service_name)) {
 					PWRN("%s: service %s is already registered",

os/src/drivers/acpi/main.cc

@@ -168,7 +168,8 @@ class Pci_policy : public Genode::Slave_policy, public Pci::Provider
 
 		bool announce_service(const char             *service_name,
 		                      Genode::Root_capability root,
-		                      Genode::Allocator      *alloc)
+		                      Genode::Allocator      *alloc,
+		                      Genode::Server         *server)
 		{
 			/* wait for 'pci_drv' to announce the PCI service */
 			if (Genode::strcmp(service_name, "PCI"))

ports/src/app/gdb_monitor/app_child.h

@@ -307,7 +307,8 @@ namespace Gdb_monitor {
 
 			bool announce_service(const char     *name,
 			                      Root_capability root,
-			                      Allocator      *alloc)
+			                      Allocator      *alloc,
+			                      Server         *server)
 			{
 				/* create and announce proxy for the child's root interface */
 				Child_service_root *r = new (alloc)