154 lines
3.5 KiB
C++
154 lines
3.5 KiB
C++
/*
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* \brief Slave used for toggling the visibility of a nitpicker session
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* \author Norman Feske
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* \date 2014-09-30
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*/
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/*
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* Copyright (C) 2014 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 General Public License version 2.
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*/
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#ifndef _NIT_FADER_SLAVE_H_
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#define _NIT_FADER_SLAVE_H_
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/* Genode includes */
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#include <os/slave.h>
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#include <nitpicker_session/nitpicker_session.h>
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/* local includes */
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#include <types.h>
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namespace Launcher { class Nit_fader_slave; }
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class Launcher::Nit_fader_slave
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{
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private:
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class Policy : public Slave_policy
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{
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private:
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Genode::Service &_nitpicker_service;
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Lock mutable _nitpicker_root_lock { Lock::LOCKED };
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Capability<Root> _nitpicker_root_cap;
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protected:
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char const **_permitted_services() const
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{
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static char const *permitted_services[] = {
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"CAP", "LOG", "SIGNAL", "RM", "Timer", 0 };
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return permitted_services;
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};
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public:
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Policy(Rpc_entrypoint &entrypoint,
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Ram_session &ram,
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Genode::Service &nitpicker_service)
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:
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Slave_policy("nit_fader", entrypoint, &ram),
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_nitpicker_service(nitpicker_service)
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{
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visible(false);
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}
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void visible(bool visible)
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{
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char config[256];
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snprintf(config, sizeof(config),
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"<config alpha=\"%d\" />", visible ? 255 : 0);
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configure(config, strlen(config) + 1);
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}
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bool announce_service(const char *service_name,
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Root_capability root,
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Allocator *,
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Genode::Server *)
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{
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if (strcmp(service_name, "Nitpicker") == 0)
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_nitpicker_root_cap = root;
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else
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return false;
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if (_nitpicker_root_cap.valid())
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_nitpicker_root_lock.unlock();
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return true;
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}
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Genode::Service *resolve_session_request(const char *service_name,
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const char *args) override
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{
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if (Genode::strcmp(service_name, "Nitpicker") == 0)
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return &_nitpicker_service;
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return Genode::Slave_policy::resolve_session_request(service_name, args);
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}
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Root_capability nitpicker_root() const
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{
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Lock::Guard guard(_nitpicker_root_lock);
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return _nitpicker_root_cap;
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}
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};
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Policy _policy;
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size_t const _quota = 2*1024*1024;
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Slave _slave;
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Root_client _nitpicker_root;
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public:
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/**
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* Constructor
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*
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* \param ep entrypoint used for nitpicker child thread
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* \param ram RAM session used to allocate the configuration
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* dataspace
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*/
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Nit_fader_slave(Rpc_entrypoint &ep, Ram_session &ram,
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Genode::Service &nitpicker_service)
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:
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_policy(ep, ram, nitpicker_service),
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_slave(ep, _policy, _quota),
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_nitpicker_root(_policy.nitpicker_root())
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{
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visible(false);
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}
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Capability<Nitpicker::Session> nitpicker_session(char const *label)
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{
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enum { ARGBUF_SIZE = 128 };
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char argbuf[ARGBUF_SIZE];
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argbuf[0] = 0;
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/*
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* Declare ram-quota donation
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*/
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enum { SESSION_METADATA = 8*1024 };
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Arg_string::set_arg(argbuf, sizeof(argbuf), "ram_quota", SESSION_METADATA);
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/*
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* Set session label
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*/
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Arg_string::set_arg_string(argbuf, sizeof(argbuf), "label", label);
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Session_capability session_cap = _nitpicker_root.session(argbuf, Affinity());
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return static_cap_cast<Nitpicker::Session>(session_cap);
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}
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void visible(bool visible)
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{
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_policy.visible(visible);
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}
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};
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#endif /* _NIT_FADER_SLAVE_H_ */
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