94 lines
2.4 KiB
C++
94 lines
2.4 KiB
C++
/*
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* \brief Utility for providing "session_requests" ROM to a child service
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* \author Norman Feske
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* \date 2016-11-10
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*/
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/*
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* Copyright (C) 2016-2017 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU Affero General Public License version 3.
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*/
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#ifndef _INCLUDE__OS__SESSION_REQUESTER_H_
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#define _INCLUDE__OS__SESSION_REQUESTER_H_
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#include <parent/parent.h>
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#include <os/dynamic_rom_session.h>
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namespace Genode { class Session_requester; }
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class Genode::Session_requester
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{
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private:
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Id_space<Parent::Server> _id_space { };
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struct Content_producer : Dynamic_rom_session::Content_producer
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{
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Id_space<Parent::Server> &_id_space;
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Content_producer(Id_space<Parent::Server> &id_space)
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: _id_space(id_space) { }
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void produce_content(char *dst, Genode::size_t dst_len) override
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{
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try {
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Xml_generator xml(dst, dst_len, "session_requests", [&] () {
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_id_space.for_each<Session_state const>([&] (Session_state const &s) {
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s.generate_session_request(xml); }); });
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} catch (Xml_generator::Buffer_exceeded &) {
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throw Buffer_capacity_exceeded();
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}
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}
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} _content_producer { _id_space };
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typedef Local_service<Dynamic_rom_session> Service;
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Dynamic_rom_session _session;
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Service::Single_session_factory _factory { _session };
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Service _service { _factory };
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public:
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typedef String<32> Rom_name;
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static Rom_name rom_name() { return "session_requests"; }
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/**
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* Constructor
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*
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* \param ep entrypoint serving the local ROM service
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* \param ram backing store for the ROM dataspace
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* \param rm local address space, needed to populate the dataspace
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*/
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Session_requester(Rpc_entrypoint &ep, Ram_allocator &ram, Region_map &rm)
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:
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_session(ep, ram, rm, _content_producer)
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{ }
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/**
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* Inform the child about a new version of the "session_requests" ROM
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*/
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void trigger_update() { _session.trigger_update(); }
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/**
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* ID space for sessios requests supplied to the child
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*/
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Id_space<Parent::Server> &id_space() { return _id_space; }
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/**
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* Non-modifiable ID space for sessios requests supplied to the child
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*/
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Id_space<Parent::Server> const &id_space() const { return _id_space; }
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/**
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* ROM service providing a single "session_requests" session
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*/
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Service &service() { return _service; }
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};
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#endif /* _INCLUDE__OS__SESSION_REQUESTER_H_ */
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