Atmosphere/libraries/libstratosphere/include/stratosphere/tipc/tipc_object_manager.hpp

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/*
* Copyright (c) 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/>.
*/
#pragma once
#include <vapours.hpp>
#include <stratosphere/tipc/tipc_common.hpp>
#include <stratosphere/tipc/tipc_service_object.hpp>
#include <stratosphere/tipc/tipc_object_holder.hpp>
namespace ams::tipc {
/* TODO: Put this in a better header. */
constexpr inline u16 MethodId_Invalid = 0x0;
constexpr inline u16 MethodId_CloseSession = 0xF;
class ObjectManagerBase {
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protected:
struct Entry {
util::TypedStorage<ObjectHolder> object;
os::MultiWaitHolderType multi_wait_holder;
};
private:
os::SdkMutex m_mutex{};
Entry *m_entries_start{};
Entry *m_entries_end{};
os::MultiWaitType *m_multi_wait{};
private:
Entry *FindEntry(os::NativeHandle handle) {
for (Entry *cur = m_entries_start; cur != m_entries_end; ++cur) {
if (GetReference(cur->object).GetHandle() == handle) {
return cur;
}
}
return nullptr;
}
Entry *FindEntry(os::MultiWaitHolderType *holder) {
for (Entry *cur = m_entries_start; cur != m_entries_end; ++cur) {
if (std::addressof(cur->multi_wait_holder) == holder) {
return cur;
}
}
return nullptr;
}
public:
constexpr ObjectManagerBase() = default;
void InitializeImpl(os::MultiWaitType *multi_wait, Entry *entries, size_t max_objects) {
/* Set our multi wait. */
m_multi_wait = multi_wait;
/* Setup entry pointers. */
m_entries_start = entries;
m_entries_end = entries + max_objects;
/* Construct all entries. */
for (size_t i = 0; i < max_objects; ++i) {
util::ConstructAt(m_entries_start[i].object);
}
}
void AddObject(ObjectHolder &object) {
/* Lock ourselves. */
std::scoped_lock lk(m_mutex);
/* Find an empty entry. */
auto *entry = this->FindEntry(os::InvalidNativeHandle);
AMS_ABORT_UNLESS(entry != nullptr);
/* Set the entry's object. */
GetReference(entry->object) = object;
/* Setup the entry's holder. */
os::InitializeMultiWaitHolder(std::addressof(entry->multi_wait_holder), object.GetHandle());
os::LinkMultiWaitHolder(m_multi_wait, std::addressof(entry->multi_wait_holder));
}
void CloseObject(os::NativeHandle handle) {
/* Lock ourselves. */
std::scoped_lock lk(m_mutex);
/* Find the matching entry. */
auto *entry = this->FindEntry(handle);
AMS_ABORT_UNLESS(entry != nullptr);
/* Finalize the entry's holder. */
os::UnlinkMultiWaitHolder(std::addressof(entry->multi_wait_holder));
os::FinalizeMultiWaitHolder(std::addressof(entry->multi_wait_holder));
/* Destroy the object. */
GetReference(entry->object).Destroy();
}
Result ReplyAndReceive(os::MultiWaitHolderType **out_holder, ObjectHolder *out_object, os::NativeHandle reply_target, os::MultiWaitType *multi_wait) {
/* Declare signaled holder for processing ahead of time. */
os::MultiWaitHolderType *signaled_holder;
/* Reply and receive until we get a newly signaled target. */
Result result = os::SdkReplyAndReceive(out_holder, reply_target, multi_wait);
for (signaled_holder = *out_holder; signaled_holder == nullptr; signaled_holder = *out_holder) {
result = os::SdkReplyAndReceive(out_holder, os::InvalidNativeHandle, multi_wait);
}
/* Find the entry matching the signaled holder. */
if (auto *entry = this->FindEntry(signaled_holder); entry != nullptr) {
/* Get the output object. */
*out_object = GetReference(entry->object);
*out_holder = nullptr;
return result;
} else {
return ResultSuccess();
}
}
Result Reply(os::NativeHandle reply_target) {
/* Perform the reply. */
s32 dummy;
R_TRY_CATCH(svc::ReplyAndReceive(std::addressof(dummy), nullptr, 0, reply_target, 0)) {
R_CATCH(svc::ResultTimedOut) {
/* Timing out is acceptable. */
}
R_CATCH(svc::ResultSessionClosed) {
/* It's okay if we couldn't reply to a closed session. */
}
} R_END_TRY_CATCH_WITH_ABORT_UNLESS;
return ResultSuccess();
}
Result ProcessRequest(ObjectHolder &object) {
/* Get the method id. */
const auto method_id = svc::ipc::MessageBuffer::MessageHeader(svc::ipc::MessageBuffer(svc::ipc::GetMessageBuffer())).GetTag();
/* Check that the method id is valid. */
R_UNLESS(method_id != MethodId_Invalid, tipc::ResultInvalidMethod());
/* If we're closing the object, do so. */
if (method_id == MethodId_CloseSession) {
const auto handle = object.GetHandle();
/* Close the object itself. */
this->CloseObject(handle);
/* Close the object's handle. */
/* NOTE: Nintendo does not check that this succeeds. */
R_ABORT_UNLESS(svc::CloseHandle(handle));
/* Return result to signify we closed the object. */
return tipc::ResultSessionClosed();
}
/* Process the generic method for the object. */
R_TRY(object.GetObject()->ProcessRequest());
return ResultSuccess();
}
};
template<size_t MaxObjects>
class ObjectManager : public ObjectManagerBase {
private:
Entry m_entries_storage[MaxObjects]{};
public:
constexpr ObjectManager() = default;
void Initialize(os::MultiWaitType *multi_wait) {
this->InitializeImpl(multi_wait, m_entries_storage, MaxObjects);
}
};
}