genode/repos/os/include/input/component.h
Norman Feske 17c79a9e23 base: avoid use of deprecated base/printf.h
Besides adapting the components to the use of base/log.h, the patch
cleans up a few base headers, i.e., it removes unused includes from
root/component.h, specifically base/heap.h and
ram_session/ram_session.h. Hence, components that relied on the implicit
inclusion of those headers have to manually include those headers now.

While adjusting the log messages, I repeatedly stumbled over the problem
that printing char * arguments is ambiguous. It is unclear whether to
print the argument as pointer or null-terminated string. To overcome
this problem, the patch introduces a new type 'Cstring' that allows the
caller to express that the argument should be handled as null-terminated
string. As a nice side effect, with this type in place, the optional len
argument of the 'String' class could be removed. Instead of supplying a
pair of (char const *, size_t), the constructor accepts a 'Cstring'.
This, in turn, clears the way let the 'String' constructor use the new
output mechanism to assemble a string from multiple arguments (and
thereby getting rid of snprintf within Genode in the near future).

To enforce the explicit resolution of the char * ambiguity, the 'char *'
overload of the 'print' function is marked as deleted.

Issue #1987
2016-08-29 17:27:10 +02:00

89 lines
2.0 KiB
C++

/*
* \brief Frontend of input service
* \author Norman Feske
* \date 2006-08-16
*/
/*
* Copyright (C) 2006-2013 Genode Labs GmbH
*
* This file is part of the Genode OS framework, which is distributed
* under the terms of the GNU General Public License version 2.
*/
#ifndef _INCLUDE__INPUT__COMPONENT_H_
#define _INCLUDE__INPUT__COMPONENT_H_
#include <base/env.h>
#include <base/rpc_server.h>
#include <os/attached_ram_dataspace.h>
#include <os/ring_buffer.h>
#include <root/component.h>
#include <input_session/input_session.h>
#include <input/event_queue.h>
namespace Input { class Session_component; }
class Input::Session_component : public Genode::Rpc_object<Input::Session>
{
private:
Genode::Attached_ram_dataspace _ds { Genode::env()->ram_session(),
Event_queue::QUEUE_SIZE*sizeof(Input::Event) };
Event_queue _event_queue;
public:
/**
* Return reference to event queue of the session
*/
Event_queue &event_queue() { return _event_queue; }
/**
* Submit input event to event queue
*/
void submit(Input::Event event)
{
try {
_event_queue.add(event);
} catch (Input::Event_queue::Overflow) {
Genode::warning("input overflow - resetting queue");
_event_queue.reset();
}
}
/******************************
** Input::Session interface **
******************************/
Genode::Dataspace_capability dataspace() override { return _ds.cap(); }
bool pending() const override { return !_event_queue.empty(); }
/*
* \deprecated use 'pending' instead
*/
bool is_pending() const { return pending(); }
int flush() override
{
Input::Event *dst = _ds.local_addr<Input::Event>();
unsigned cnt = 0;
for (; cnt < Event_queue::QUEUE_SIZE && !_event_queue.empty(); cnt++)
*dst++ = _event_queue.get();
return cnt;
}
void sigh(Genode::Signal_context_capability sigh) override
{
_event_queue.sigh(sigh);
}
};
#endif /* _INCLUDE__INPUT__COMPONENT_H_ */