Atmosphere/libraries/libmesosphere/source/svc/kern_svc_event.cpp

127 lines
4.6 KiB
C++

/*
* Copyright (c) 2018-2020 Atmosphère-NX
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <mesosphere.hpp>
namespace ams::kern::svc {
/* ============================= Common ============================= */
namespace {
Result SignalEvent(ams::svc::Handle event_handle) {
/* Get the current handle table. */
auto &handle_table = GetCurrentProcess().GetHandleTable();
/* Get the writable event. */
KScopedAutoObject writable_event = handle_table.GetObject<KWritableEvent>(event_handle);
R_UNLESS(writable_event.IsNotNull(), svc::ResultInvalidHandle());
return writable_event->Signal();
}
Result ClearEvent(ams::svc::Handle event_handle) {
/* Get the current handle table. */
auto &handle_table = GetCurrentProcess().GetHandleTable();
/* Try to clear the writable event. */
{
KScopedAutoObject writable_event = handle_table.GetObject<KWritableEvent>(event_handle);
if (writable_event.IsNotNull()) {
return writable_event->Clear();
}
}
/* Try to clear the readable event. */
{
KScopedAutoObject readable_event = handle_table.GetObject<KReadableEvent>(event_handle);
if (readable_event.IsNotNull()) {
return readable_event->Clear();
}
}
return svc::ResultInvalidHandle();
}
Result CreateEvent(ams::svc::Handle *out_write, ams::svc::Handle *out_read) {
/* Get the current process and handle table. */
auto &process = GetCurrentProcess();
auto &handle_table = process.GetHandleTable();
/* Reserve a new event from the process resource limit. */
KScopedResourceReservation event_reservation(std::addressof(process), ams::svc::LimitableResource_EventCountMax);
R_UNLESS(event_reservation.Succeeded(), svc::ResultLimitReached());
/* Create a new event. */
KEvent *event = KEvent::Create();
R_UNLESS(event != nullptr, svc::ResultOutOfResource());
/* Initialize the event. */
event->Initialize();
/* Ensure that we clean up the event (and its only references are handle table) on function end. */
ON_SCOPE_EXIT {
event->GetWritableEvent().Close();
event->GetReadableEvent().Close();
};
/* Register the event. */
R_TRY(KEvent::Register(event));
/* Add the writable event to the handle table. */
R_TRY(handle_table.Add(out_write, std::addressof(event->GetWritableEvent())));
/* Ensure that we maintaing a clean handle state on exit. */
auto handle_guard = SCOPE_GUARD { handle_table.Remove(*out_write); };
/* Add the readable event to the handle table. */
R_TRY(handle_table.Add(out_read, std::addressof(event->GetReadableEvent())));
/* We succeeded! */
handle_guard.Cancel();
return ResultSuccess();
}
}
/* ============================= 64 ABI ============================= */
Result SignalEvent64(ams::svc::Handle event_handle) {
return SignalEvent(event_handle);
}
Result ClearEvent64(ams::svc::Handle event_handle) {
return ClearEvent(event_handle);
}
Result CreateEvent64(ams::svc::Handle *out_write_handle, ams::svc::Handle *out_read_handle) {
return CreateEvent(out_write_handle, out_read_handle);
}
/* ============================= 64From32 ABI ============================= */
Result SignalEvent64From32(ams::svc::Handle event_handle) {
return SignalEvent(event_handle);
}
Result ClearEvent64From32(ams::svc::Handle event_handle) {
return ClearEvent(event_handle);
}
Result CreateEvent64From32(ams::svc::Handle *out_write_handle, ams::svc::Handle *out_read_handle) {
return CreateEvent(out_write_handle, out_read_handle);
}
}