os: event_dump server for printing events

This component takes over the role of the test-input component.

Issue #3827

repos/os/src/server/event_dump/main.cc

@@ -0,0 +1,90 @@
+/*
+ * \brief  Event service that prints incoming events
+ * \author Norman Feske
+ * \date   2020-08-11
+ */
+
+/*
+ * Copyright (C) 2020 Genode Labs GmbH
+ *
+ * This file is part of the Genode OS framework, which is distributed
+ * under the terms of the GNU Affero General Public License version 3.
+ */
+
+/* Genode includes */
+#include <base/component.h>
+#include <base/attached_ram_dataspace.h>
+#include <input/event.h>
+#include <event_session/event_session.h>
+#include <os/static_root.h>
+
+namespace Test {
+
+	using namespace Genode;
+
+	struct Event_session;
+	struct Main;
+}
+
+
+struct Test::Event_session : Rpc_object<Event::Session, Event_session>
+{
+	Attached_ram_dataspace _ds;
+
+	unsigned _event_cnt = 0;
+	int      _key_cnt   = 0;
+
+	Dataspace_capability dataspace() { return _ds.cap(); }
+
+	void submit_batch(unsigned count)
+	{
+		size_t const max_events = _ds.size() / sizeof(Input::Event);
+
+		if (count > max_events)
+			warning("number of events exceeds dataspace capacity");
+
+		count = min(count, max_events);
+
+		Input::Event const * const events = _ds.local_addr<Input::Event>();
+
+		for (unsigned i = 0; i < count; i++) {
+
+			Input::Event const &ev = events[i];
+
+			if (ev.press())   ++_key_cnt;
+			if (ev.release()) --_key_cnt;
+
+			log("Input event #", _event_cnt++, "\t", ev, "\tkey count: ", _key_cnt);
+		}
+	}
+
+	Event_session(Env &env) : _ds(env.ram(), env.rm(), 4096) { }
+};
+
+
+/******************
+ ** Main program **
+ ******************/
+
+struct Test::Main
+{
+	Env &_env;
+
+	Event_session _event_session { _env };
+
+	/*
+	 * Attach root interfaces to the entry point
+	 */
+	Static_root<Event::Session> _event_root { _env.ep().manage(_event_session) };
+
+	Main(Env &env)
+	:
+		_env(env)
+	{
+		_env.parent().announce(env.ep().manage(_event_root));
+	}
+};
+
+
+void Component::construct(Genode::Env &env) { static Test::Main main(env); }
+

repos/os/src/server/event_dump/target.mk

@@ -0,0 +1,3 @@
+TARGET = event_dump
+SRC_CC = main.cc
+LIBS   = base