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// Copyright 2014 Citra Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#pragma once
#include <memory>
#include <string>
#include <utility>
#include <vector>
#include "core/hle/kernel/object.h"
#include "core/hle/kernel/wait_object.h"
#include "core/hle/result.h"
namespace Memory {
class Memory;
}
namespace Kernel {
class ClientPort;
class ClientSession;
class HLERequestContext;
class KernelCore;
class ServerSession;
class Session;
class SessionRequestHandler;
class Thread;
/**
* Kernel object representing the server endpoint of an IPC session. Sessions are the basic CTR-OS
* primitive for communication between different processes, and are used to implement service calls
* to the various system services.
*
* To make a service call, the client must write the command header and parameters to the buffer
* located at offset 0x80 of the TLS (Thread-Local Storage) area, then execute a SendSyncRequest
* SVC call with its ClientSession handle. The kernel will read the command header, using it to
* marshall the parameters to the process at the server endpoint of the session.
* After the server replies to the request, the response is marshalled back to the caller's
* TLS buffer and control is transferred back to it.
*/
class ServerSession final : public WaitObject {
public:
explicit ServerSession(KernelCore& kernel);
~ServerSession() override;
std::string GetTypeName() const override {
return "ServerSession";
}
std::string GetName() const override {
return name;
}
static constexpr HandleType HANDLE_TYPE = HandleType::ServerSession;
HandleType GetHandleType() const override {
return HANDLE_TYPE;
}
Session* GetParent() {
return parent.get();
}
const Session* GetParent() const {
return parent.get();
}
using SessionPair = std::pair<std::shared_ptr<ServerSession>, std::shared_ptr<ClientSession>>;
/**
* Creates a pair of ServerSession and an associated ClientSession.
* @param kernel The kernal instance to create the session pair under.
* @param name Optional name of the ports.
* @param client_port Optional The ClientPort that spawned this session.
* @return The created session tuple
*/
static SessionPair CreateSessionPair(KernelCore& kernel, const std::string& name = "Unknown",
std::shared_ptr<ClientPort> client_port = nullptr);
/**
* Sets the HLE handler for the session. This handler will be called to service IPC requests
* instead of the regular IPC machinery. (The regular IPC machinery is currently not
* implemented.)
*/
void SetHleHandler(std::shared_ptr<SessionRequestHandler> hle_handler_) {
hle_handler = std::move(hle_handler_);
}
/**
* Handle a sync request from the emulated application.
*
* @param thread Thread that initiated the request.
* @param memory Memory context to handle the sync request under.
*
* @returns ResultCode from the operation.
*/
ResultCode HandleSyncRequest(std::shared_ptr<Thread> thread, Memory::Memory& memory);
bool ShouldWait(const Thread* thread) const override;
void Acquire(Thread* thread) override;
/// Called when a client disconnection occurs.
void ClientDisconnected();
/// Adds a new domain request handler to the collection of request handlers within
/// this ServerSession instance.
void AppendDomainRequestHandler(std::shared_ptr<SessionRequestHandler> handler);
/// Retrieves the total number of domain request handlers that have been
/// appended to this ServerSession instance.
std::size_t NumDomainRequestHandlers() const;
/// Returns true if the session has been converted to a domain, otherwise False
bool IsDomain() const {
return !IsSession();
}
/// Returns true if this session has not been converted to a domain, otherwise false.
bool IsSession() const {
return domain_request_handlers.empty();
}
/// Converts the session to a domain at the end of the current command
void ConvertToDomain() {
convert_to_domain = true;
}
private:
/**
* Creates a server session. The server session can have an optional HLE handler,
* which will be invoked to handle the IPC requests that this session receives.
* @param kernel The kernel instance to create this server session under.
* @param name Optional name of the server session.
* @return The created server session
*/
static ResultVal<std::shared_ptr<ServerSession>> Create(KernelCore& kernel,
std::string name = "Unknown");
/// Handles a SyncRequest to a domain, forwarding the request to the proper object or closing an
/// object handle.
ResultCode HandleDomainSyncRequest(Kernel::HLERequestContext& context);
/// The parent session, which links to the client endpoint.
std::shared_ptr<Session> parent;
/// This session's HLE request handler (applicable when not a domain)
std::shared_ptr<SessionRequestHandler> hle_handler;
/// This is the list of domain request handlers (after conversion to a domain)
std::vector<std::shared_ptr<SessionRequestHandler>> domain_request_handlers;
/// List of threads that are pending a response after a sync request. This list is processed in
/// a LIFO manner, thus, the last request will be dispatched first.
/// TODO(Subv): Verify if this is indeed processed in LIFO using a hardware test.
std::vector<std::shared_ptr<Thread>> pending_requesting_threads;
/// Thread whose request is currently being handled. A request is considered "handled" when a
/// response is sent via svcReplyAndReceive.
/// TODO(Subv): Find a better name for this.
std::shared_ptr<Thread> currently_handling;
/// When set to True, converts the session to a domain at the end of the command
bool convert_to_domain{};
/// The name of this session (optional)
std::string name;
};
} // namespace Kernel
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