11 files changed, 196 insertions, 64 deletions

diff --git a/src/core/hle/service/apt/apt.h b/src/core/hle/service/apt/apt.h
index e6a8be870..80325361f 100644
--- a/src/core/hle/service/apt/apt.h
+++ b/src/core/hle/service/apt/apt.h
@@ -14,6 +14,9 @@ class Interface;
 
 namespace APT {
 
+/// Each APT service can only have up to 2 sessions connected at the same time.
+static const u32 MaxAPTSessions = 2;
+
 /// Holds information about the parameters used in Send/Glance/ReceiveParameter
 struct MessageParameter {
     u32 sender_id = 0;
diff --git a/src/core/hle/service/apt/apt_a.cpp b/src/core/hle/service/apt/apt_a.cpp
index 6e35e1d29..62dc2d61d 100644
--- a/src/core/hle/service/apt/apt_a.cpp
+++ b/src/core/hle/service/apt/apt_a.cpp
@@ -102,7 +102,7 @@ const Interface::FunctionInfo FunctionTable[] = {
     {0x01050100, nullptr, "IsTitleAllowed"},
 };
 
-APT_A_Interface::APT_A_Interface() {
+APT_A_Interface::APT_A_Interface() : Interface(MaxAPTSessions) {
     Register(FunctionTable);
 }
 
diff --git a/src/core/hle/service/apt/apt_s.cpp b/src/core/hle/service/apt/apt_s.cpp
index 84019e6e5..effd23dce 100644
--- a/src/core/hle/service/apt/apt_s.cpp
+++ b/src/core/hle/service/apt/apt_s.cpp
@@ -102,7 +102,7 @@ const Interface::FunctionInfo FunctionTable[] = {
     {0x01050100, nullptr, "IsTitleAllowed"},
 };
 
-APT_S_Interface::APT_S_Interface() {
+APT_S_Interface::APT_S_Interface() : Interface(MaxAPTSessions) {
     Register(FunctionTable);
 }
 
diff --git a/src/core/hle/service/apt/apt_u.cpp b/src/core/hle/service/apt/apt_u.cpp
index a731c39f6..e06084a1e 100644
--- a/src/core/hle/service/apt/apt_u.cpp
+++ b/src/core/hle/service/apt/apt_u.cpp
@@ -99,7 +99,7 @@ const Interface::FunctionInfo FunctionTable[] = {
     {0x01020000, CheckNew3DS, "CheckNew3DS"},
 };
 
-APT_U_Interface::APT_U_Interface() {
+APT_U_Interface::APT_U_Interface() : Interface(MaxAPTSessions) {
     Register(FunctionTable);
 }
 
diff --git a/src/core/hle/service/fs/archive.cpp b/src/core/hle/service/fs/archive.cpp
index bef75f5df..f21934108 100644
--- a/src/core/hle/service/fs/archive.cpp
+++ b/src/core/hle/service/fs/archive.cpp
@@ -24,6 +24,7 @@
 #include "core/file_sys/directory_backend.h"
 #include "core/file_sys/file_backend.h"
 #include "core/hle/hle.h"
+#include "core/hle/kernel/client_session.h"
 #include "core/hle/result.h"
 #include "core/hle/service/fs/archive.h"
 #include "core/hle/service/fs/fs_user.h"
@@ -93,7 +94,7 @@ File::File(std::unique_ptr<FileSys::FileBackend>&& backend, const FileSys::Path&
 
 File::~File() {}
 
-ResultVal<bool> File::SyncRequest() {
+void File::HandleSyncRequest(Kernel::SharedPtr<Kernel::ServerSession> server_session) {
     u32* cmd_buff = Kernel::GetCommandBuffer();
     FileCommand cmd = static_cast<FileCommand>(cmd_buff[0]);
     switch (cmd) {
@@ -116,7 +117,7 @@ ResultVal<bool> File::SyncRequest() {
         ResultVal<size_t> read = backend->Read(offset, data.size(), data.data());
         if (read.Failed()) {
             cmd_buff[1] = read.Code().raw;
-            return read.Code();
+            return;
         }
         Memory::WriteBlock(address, data.data(), *read);
         cmd_buff[2] = static_cast<u32>(*read);
@@ -137,7 +138,7 @@ ResultVal<bool> File::SyncRequest() {
         ResultVal<size_t> written = backend->Write(offset, data.size(), flush != 0, data.data());
         if (written.Failed()) {
             cmd_buff[1] = written.Code().raw;
-            return written.Code();
+            return;
         }
         cmd_buff[2] = static_cast<u32>(*written);
         break;
@@ -173,7 +174,11 @@ ResultVal<bool> File::SyncRequest() {
 
     case FileCommand::OpenLinkFile: {
         LOG_WARNING(Service_FS, "(STUBBED) File command OpenLinkFile %s", GetName().c_str());
-        cmd_buff[3] = Kernel::g_handle_table.Create(this).ValueOr(INVALID_HANDLE);
+        auto sessions = Kernel::ServerSession::CreateSessionPair(GetName(), shared_from_this());
+        ClientConnected(std::get<Kernel::SharedPtr<Kernel::ServerSession>>(sessions));
+        cmd_buff[3] = Kernel::g_handle_table
+                          .Create(std::get<Kernel::SharedPtr<Kernel::ClientSession>>(sessions))
+                          .ValueOr(INVALID_HANDLE);
         break;
     }
 
@@ -194,10 +199,9 @@ ResultVal<bool> File::SyncRequest() {
         LOG_ERROR(Service_FS, "Unknown command=0x%08X!", cmd);
         ResultCode error = UnimplementedFunction(ErrorModule::FS);
         cmd_buff[1] = error.raw; // TODO(Link Mauve): use the correct error code for that.
-        return error;
+        return;
     }
     cmd_buff[1] = RESULT_SUCCESS.raw; // No error
-    return MakeResult<bool>(false);
 }
 
 Directory::Directory(std::unique_ptr<FileSys::DirectoryBackend>&& backend,
@@ -206,11 +210,10 @@ Directory::Directory(std::unique_ptr<FileSys::DirectoryBackend>&& backend,
 
 Directory::~Directory() {}
 
-ResultVal<bool> Directory::SyncRequest() {
+void Directory::HandleSyncRequest(Kernel::SharedPtr<Kernel::ServerSession> server_session) {
     u32* cmd_buff = Kernel::GetCommandBuffer();
     DirectoryCommand cmd = static_cast<DirectoryCommand>(cmd_buff[0]);
     switch (cmd) {
-
     // Read from directory...
     case DirectoryCommand::Read: {
         u32 count = cmd_buff[1];
@@ -237,10 +240,9 @@ ResultVal<bool> Directory::SyncRequest() {
         LOG_ERROR(Service_FS, "Unknown command=0x%08X!", cmd);
         ResultCode error = UnimplementedFunction(ErrorModule::FS);
         cmd_buff[1] = error.raw; // TODO(Link Mauve): use the correct error code for that.
-        return MakeResult<bool>(false);
+        return;
     }
     cmd_buff[1] = RESULT_SUCCESS.raw; // No error
-    return MakeResult<bool>(false);
 }
 
 ////////////////////////////////////////////////////////////////////////////////////////////////////
@@ -307,9 +309,9 @@ ResultCode RegisterArchiveType(std::unique_ptr<FileSys::ArchiveFactory>&& factor
     return RESULT_SUCCESS;
 }
 
-ResultVal<Kernel::SharedPtr<File>> OpenFileFromArchive(ArchiveHandle archive_handle,
-                                                       const FileSys::Path& path,
-                                                       const FileSys::Mode mode) {
+ResultVal<std::shared_ptr<File>> OpenFileFromArchive(ArchiveHandle archive_handle,
+                                                     const FileSys::Path& path,
+                                                     const FileSys::Mode mode) {
     ArchiveBackend* archive = GetArchive(archive_handle);
     if (archive == nullptr)
         return ERR_INVALID_ARCHIVE_HANDLE;
@@ -318,8 +320,8 @@ ResultVal<Kernel::SharedPtr<File>> OpenFileFromArchive(ArchiveHandle archive_han
     if (backend.Failed())
         return backend.Code();
 
-    auto file = Kernel::SharedPtr<File>(new File(backend.MoveFrom(), path));
-    return MakeResult<Kernel::SharedPtr<File>>(std::move(file));
+    auto file = std::shared_ptr<File>(new File(backend.MoveFrom(), path));
+    return MakeResult<std::shared_ptr<File>>(std::move(file));
 }
 
 ResultCode DeleteFileFromArchive(ArchiveHandle archive_handle, const FileSys::Path& path) {
@@ -398,8 +400,8 @@ ResultCode RenameDirectoryBetweenArchives(ArchiveHandle src_archive_handle,
     }
 }
 
-ResultVal<Kernel::SharedPtr<Directory>> OpenDirectoryFromArchive(ArchiveHandle archive_handle,
-                                                                 const FileSys::Path& path) {
+ResultVal<std::shared_ptr<Directory>> OpenDirectoryFromArchive(ArchiveHandle archive_handle,
+                                                               const FileSys::Path& path) {
     ArchiveBackend* archive = GetArchive(archive_handle);
     if (archive == nullptr)
         return ERR_INVALID_ARCHIVE_HANDLE;
@@ -408,8 +410,8 @@ ResultVal<Kernel::SharedPtr<Directory>> OpenDirectoryFromArchive(ArchiveHandle a
     if (backend.Failed())
         return backend.Code();
 
-    auto directory = Kernel::SharedPtr<Directory>(new Directory(backend.MoveFrom(), path));
-    return MakeResult<Kernel::SharedPtr<Directory>>(std::move(directory));
+    auto directory = std::shared_ptr<Directory>(new Directory(backend.MoveFrom(), path));
+    return MakeResult<std::shared_ptr<Directory>>(std::move(directory));
 }
 
 ResultVal<u64> GetFreeBytesInArchive(ArchiveHandle archive_handle) {
diff --git a/src/core/hle/service/fs/archive.h b/src/core/hle/service/fs/archive.h
index 87089bd92..7ba62ede0 100644
--- a/src/core/hle/service/fs/archive.h
+++ b/src/core/hle/service/fs/archive.h
@@ -8,7 +8,7 @@
 #include <string>
 #include "common/common_types.h"
 #include "core/file_sys/archive_backend.h"
-#include "core/hle/kernel/session.h"
+#include "core/hle/kernel/server_session.h"
 #include "core/hle/result.h"
 
 namespace FileSys {
@@ -43,33 +43,37 @@ enum class MediaType : u32 { NAND = 0, SDMC = 1, GameCard = 2 };
 
 typedef u64 ArchiveHandle;
 
-class File : public Kernel::Session {
+class File final : public SessionRequestHandler, public std::enable_shared_from_this<File> {
 public:
     File(std::unique_ptr<FileSys::FileBackend>&& backend, const FileSys::Path& path);
     ~File();
 
-    std::string GetName() const override {
+    std::string GetName() const {
         return "Path: " + path.DebugStr();
     }
-    ResultVal<bool> SyncRequest() override;
 
     FileSys::Path path; ///< Path of the file
     u32 priority;       ///< Priority of the file. TODO(Subv): Find out what this means
     std::unique_ptr<FileSys::FileBackend> backend; ///< File backend interface
+
+protected:
+    void HandleSyncRequest(Kernel::SharedPtr<Kernel::ServerSession> server_session) override;
 };
 
-class Directory : public Kernel::Session {
+class Directory final : public SessionRequestHandler {
 public:
     Directory(std::unique_ptr<FileSys::DirectoryBackend>&& backend, const FileSys::Path& path);
     ~Directory();
 
-    std::string GetName() const override {
+    std::string GetName() const {
         return "Directory: " + path.DebugStr();
     }
-    ResultVal<bool> SyncRequest() override;
 
     FileSys::Path path;                                 ///< Path of the directory
     std::unique_ptr<FileSys::DirectoryBackend> backend; ///< File backend interface
+
+protected:
+    void HandleSyncRequest(Kernel::SharedPtr<Kernel::ServerSession> server_session) override;
 };
 
 /**
@@ -99,11 +103,11 @@ ResultCode RegisterArchiveType(std::unique_ptr<FileSys::ArchiveFactory>&& factor
  * @param archive_handle Handle to an open Archive object
  * @param path Path to the File inside of the Archive
  * @param mode Mode under which to open the File
- * @return The opened File object as a Session
+ * @return The opened File object
  */
-ResultVal<Kernel::SharedPtr<File>> OpenFileFromArchive(ArchiveHandle archive_handle,
-                                                       const FileSys::Path& path,
-                                                       const FileSys::Mode mode);
+ResultVal<std::shared_ptr<File>> OpenFileFromArchive(ArchiveHandle archive_handle,
+                                                     const FileSys::Path& path,
+                                                     const FileSys::Mode mode);
 
 /**
  * Delete a File from an Archive
@@ -178,10 +182,10 @@ ResultCode RenameDirectoryBetweenArchives(ArchiveHandle src_archive_handle,
  * Open a Directory from an Archive
  * @param archive_handle Handle to an open Archive object
  * @param path Path to the Directory inside of the Archive
- * @return The opened Directory object as a Session
+ * @return The opened Directory object
  */
-ResultVal<Kernel::SharedPtr<Directory>> OpenDirectoryFromArchive(ArchiveHandle archive_handle,
-                                                                 const FileSys::Path& path);
+ResultVal<std::shared_ptr<Directory>> OpenDirectoryFromArchive(ArchiveHandle archive_handle,
+                                                               const FileSys::Path& path);
 
 /**
  * Get the free space in an Archive
diff --git a/src/core/hle/service/fs/fs_user.cpp b/src/core/hle/service/fs/fs_user.cpp
index d6ab5b065..337da1387 100644
--- a/src/core/hle/service/fs/fs_user.cpp
+++ b/src/core/hle/service/fs/fs_user.cpp
@@ -8,6 +8,7 @@
 #include "common/logging/log.h"
 #include "common/scope_exit.h"
 #include "common/string_util.h"
+#include "core/hle/kernel/client_session.h"
 #include "core/hle/result.h"
 #include "core/hle/service/fs/archive.h"
 #include "core/hle/service/fs/fs_user.h"
@@ -17,7 +18,7 @@
 // Namespace FS_User
 
 using Kernel::SharedPtr;
-using Kernel::Session;
+using Kernel::ServerSession;
 
 namespace Service {
 namespace FS {
@@ -67,10 +68,16 @@ static void OpenFile(Service::Interface* self) {
     LOG_DEBUG(Service_FS, "path=%s, mode=%u attrs=%u", file_path.DebugStr().c_str(), mode.hex,
               attributes);
 
-    ResultVal<SharedPtr<File>> file_res = OpenFileFromArchive(archive_handle, file_path, mode);
+    ResultVal<std::shared_ptr<File>> file_res =
+        OpenFileFromArchive(archive_handle, file_path, mode);
     cmd_buff[1] = file_res.Code().raw;
     if (file_res.Succeeded()) {
-        cmd_buff[3] = Kernel::g_handle_table.Create(*file_res).MoveFrom();
+        std::shared_ptr<File> file = *file_res;
+        auto sessions = ServerSession::CreateSessionPair(file->GetName(), file);
+        file->ClientConnected(std::get<Kernel::SharedPtr<Kernel::ServerSession>>(sessions));
+        cmd_buff[3] = Kernel::g_handle_table
+                          .Create(std::get<Kernel::SharedPtr<Kernel::ClientSession>>(sessions))
+                          .MoveFrom();
     } else {
         cmd_buff[3] = 0;
         LOG_ERROR(Service_FS, "failed to get a handle for file %s", file_path.DebugStr().c_str());
@@ -127,10 +134,16 @@ static void OpenFileDirectly(Service::Interface* self) {
     }
     SCOPE_EXIT({ CloseArchive(*archive_handle); });
 
-    ResultVal<SharedPtr<File>> file_res = OpenFileFromArchive(*archive_handle, file_path, mode);
+    ResultVal<std::shared_ptr<File>> file_res =
+        OpenFileFromArchive(*archive_handle, file_path, mode);
     cmd_buff[1] = file_res.Code().raw;
     if (file_res.Succeeded()) {
-        cmd_buff[3] = Kernel::g_handle_table.Create(*file_res).MoveFrom();
+        std::shared_ptr<File> file = *file_res;
+        auto sessions = ServerSession::CreateSessionPair(file->GetName(), file);
+        file->ClientConnected(std::get<Kernel::SharedPtr<Kernel::ServerSession>>(sessions));
+        cmd_buff[3] = Kernel::g_handle_table
+                          .Create(std::get<Kernel::SharedPtr<Kernel::ClientSession>>(sessions))
+                          .MoveFrom();
     } else {
         cmd_buff[3] = 0;
         LOG_ERROR(Service_FS, "failed to get a handle for file %s mode=%u attributes=%u",
@@ -388,10 +401,16 @@ static void OpenDirectory(Service::Interface* self) {
     LOG_DEBUG(Service_FS, "type=%u size=%u data=%s", static_cast<u32>(dirname_type), dirname_size,
               dir_path.DebugStr().c_str());
 
-    ResultVal<SharedPtr<Directory>> dir_res = OpenDirectoryFromArchive(archive_handle, dir_path);
+    ResultVal<std::shared_ptr<Directory>> dir_res =
+        OpenDirectoryFromArchive(archive_handle, dir_path);
     cmd_buff[1] = dir_res.Code().raw;
     if (dir_res.Succeeded()) {
-        cmd_buff[3] = Kernel::g_handle_table.Create(*dir_res).MoveFrom();
+        std::shared_ptr<Directory> directory = *dir_res;
+        auto sessions = ServerSession::CreateSessionPair(directory->GetName(), directory);
+        directory->ClientConnected(std::get<Kernel::SharedPtr<Kernel::ServerSession>>(sessions));
+        cmd_buff[3] = Kernel::g_handle_table
+                          .Create(std::get<Kernel::SharedPtr<Kernel::ClientSession>>(sessions))
+                          .MoveFrom();
     } else {
         LOG_ERROR(Service_FS, "failed to get a handle for directory type=%d size=%d data=%s",
                   dirname_type, dirname_size, dir_path.DebugStr().c_str());
diff --git a/src/core/hle/service/service.cpp b/src/core/hle/service/service.cpp
index effecc043..2bc3fdc82 100644
--- a/src/core/hle/service/service.cpp
+++ b/src/core/hle/service/service.cpp
@@ -2,8 +2,12 @@
 // Licensed under GPLv2 or any later version
 // Refer to the license.txt file included.
 
+#include <boost/range/algorithm_ext/erase.hpp>
+
 #include "common/logging/log.h"
 #include "common/string_util.h"
+
+#include "core/hle/kernel/server_port.h"
 #include "core/hle/service/ac_u.h"
 #include "core/hle/service/act_a.h"
 #include "core/hle/service/act_u.h"
@@ -44,8 +48,8 @@
 
 namespace Service {
 
-std::unordered_map<std::string, Kernel::SharedPtr<Interface>> g_kernel_named_ports;
-std::unordered_map<std::string, Kernel::SharedPtr<Interface>> g_srv_services;
+std::unordered_map<std::string, Kernel::SharedPtr<Kernel::ClientPort>> g_kernel_named_ports;
+std::unordered_map<std::string, Kernel::SharedPtr<Kernel::ClientPort>> g_srv_services;
 
 /**
  * Creates a function string for logging, complete with the name (or header code, depending
@@ -64,7 +68,23 @@ static std::string MakeFunctionString(const char* name, const char* port_name,
     return function_string;
 }
 
-ResultVal<bool> Interface::SyncRequest() {
+void SessionRequestHandler::ClientConnected(
+    Kernel::SharedPtr<Kernel::ServerSession> server_session) {
+    connected_sessions.push_back(server_session);
+}
+
+void SessionRequestHandler::ClientDisconnected(
+    Kernel::SharedPtr<Kernel::ServerSession> server_session) {
+    boost::range::remove_erase(connected_sessions, server_session);
+}
+
+Interface::Interface(u32 max_sessions) : max_sessions(max_sessions) {}
+Interface::~Interface() = default;
+
+void Interface::HandleSyncRequest(Kernel::SharedPtr<Kernel::ServerSession> server_session) {
+    // TODO(Subv): Make use of the server_session in the HLE service handlers to distinguish which
+    // session triggered each command.
+
     u32* cmd_buff = Kernel::GetCommandBuffer();
     auto itr = m_functions.find(cmd_buff[0]);
 
@@ -78,14 +98,12 @@ ResultVal<bool> Interface::SyncRequest() {
 
         // TODO(bunnei): Hack - ignore error
         cmd_buff[1] = 0;
-        return MakeResult<bool>(false);
+        return;
     }
     LOG_TRACE(Service, "%s",
               MakeFunctionString(itr->second.name, GetPortName().c_str(), cmd_buff).c_str());
 
     itr->second.func(this);
-
-    return MakeResult<bool>(false); // TODO: Implement return from actual function
 }
 
 void Interface::Register(const FunctionInfo* functions, size_t n) {
@@ -100,11 +118,19 @@ void Interface::Register(const FunctionInfo* functions, size_t n) {
 // Module interface
 
 static void AddNamedPort(Interface* interface_) {
-    g_kernel_named_ports.emplace(interface_->GetPortName(), interface_);
+    auto ports =
+        Kernel::ServerPort::CreatePortPair(interface_->GetMaxSessions(), interface_->GetPortName(),
+                                           std::shared_ptr<Interface>(interface_));
+    auto client_port = std::get<Kernel::SharedPtr<Kernel::ClientPort>>(ports);
+    g_kernel_named_ports.emplace(interface_->GetPortName(), std::move(client_port));
 }
 
 void AddService(Interface* interface_) {
-    g_srv_services.emplace(interface_->GetPortName(), interface_);
+    auto ports =
+        Kernel::ServerPort::CreatePortPair(interface_->GetMaxSessions(), interface_->GetPortName(),
+                                           std::shared_ptr<Interface>(interface_));
+    auto client_port = std::get<Kernel::SharedPtr<Kernel::ClientPort>>(ports);
+    g_srv_services.emplace(interface_->GetPortName(), std::move(client_port));
 }
 
 /// Initialize ServiceManager
diff --git a/src/core/hle/service/service.h b/src/core/hle/service/service.h
index 29daacfc4..a7ba7688f 100644
--- a/src/core/hle/service/service.h
+++ b/src/core/hle/service/service.h
@@ -9,8 +9,15 @@
 #include <unordered_map>
 #include <boost/container/flat_map.hpp>
 #include "common/common_types.h"
-#include "core/hle/kernel/session.h"
+#include "core/hle/ipc.h"
+#include "core/hle/kernel/client_port.h"
+#include "core/hle/kernel/thread.h"
 #include "core/hle/result.h"
+#include "core/memory.h"
+
+namespace Kernel {
+class ServerSession;
+}
 
 ////////////////////////////////////////////////////////////////////////////////////////////////////
 // Namespace Service
@@ -18,14 +25,63 @@
 namespace Service {
 
 static const int kMaxPortSize = 8; ///< Maximum size of a port name (8 characters)
+/// Arbitrary default number of maximum connections to an HLE service.
+static const u32 DefaultMaxSessions = 10;
+
+/**
+ * Interface implemented by HLE Session handlers.
+ * This can be provided to a ServerSession in order to hook into several relevant events
+ * (such as a new connection or a SyncRequest) so they can be implemented in the emulator.
+ */
+class SessionRequestHandler {
+public:
+    /**
+     * Handles a sync request from the emulated application.
+     * @param server_session The ServerSession that was triggered for this sync request,
+     * it should be used to differentiate which client (As in ClientSession) we're answering to.
+     * TODO(Subv): Use a wrapper structure to hold all the information relevant to
+     * this request (ServerSession, Originator thread, Translated command buffer, etc).
+     * @returns ResultCode the result code of the translate operation.
+     */
+    virtual void HandleSyncRequest(Kernel::SharedPtr<Kernel::ServerSession> server_session) = 0;
+
+    /**
+     * Signals that a client has just connected to this HLE handler and keeps the
+     * associated ServerSession alive for the duration of the connection.
+     * @param server_session Owning pointer to the ServerSession associated with the connection.
+     */
+    void ClientConnected(Kernel::SharedPtr<Kernel::ServerSession> server_session);
+
+    /**
+     * Signals that a client has just disconnected from this HLE handler and releases the
+     * associated ServerSession.
+     * @param server_session ServerSession associated with the connection.
+     */
+    void ClientDisconnected(Kernel::SharedPtr<Kernel::ServerSession> server_session);
 
-/// Interface to a CTROS service
-class Interface : public Kernel::Session {
-    // TODO(yuriks): An "Interface" being a Kernel::Object is mostly non-sense. Interface should be
-    // just something that encapsulates a session and acts as a helper to implement service
-    // processes.
+protected:
+    /// List of sessions that are connected to this handler.
+    /// A ServerSession whose server endpoint is an HLE implementation is kept alive by this list
+    // for the duration of the connection.
+    std::vector<Kernel::SharedPtr<Kernel::ServerSession>> connected_sessions;
+};
+
+/**
+ * Framework for implementing HLE service handlers which dispatch incoming SyncRequests based on a
+ * table mapping header ids to handler functions.
+ */
+class Interface : public SessionRequestHandler {
 public:
-    std::string GetName() const override {
+    /**
+     * Creates an HLE interface with the specified max sessions.
+     * @param max_sessions Maximum number of sessions that can be
+     * connected to this service at the same time.
+     */
+    Interface(u32 max_sessions = DefaultMaxSessions);
+
+    virtual ~Interface();
+
+    std::string GetName() const {
         return GetPortName();
     }
 
@@ -33,6 +89,15 @@ public:
         version.raw = raw_version;
     }
 
+    /**
+     * Gets the maximum allowed number of sessions that can be connected to this service
+     * at the same time.
+     * @returns The maximum number of connections allowed.
+     */
+    u32 GetMaxSessions() const {
+        return max_sessions;
+    }
+
     typedef void (*Function)(Interface*);
 
     struct FunctionInfo {
@@ -49,9 +114,9 @@ public:
         return "[UNKNOWN SERVICE PORT]";
     }
 
-    ResultVal<bool> SyncRequest() override;
-
 protected:
+    void HandleSyncRequest(Kernel::SharedPtr<Kernel::ServerSession> server_session) override;
+
     /**
      * Registers the functions in the service
      */
@@ -71,6 +136,7 @@ protected:
     } version = {};
 
 private:
+    u32 max_sessions; ///< Maximum number of concurrent sessions that this service can handle.
     boost::container::flat_map<u32, FunctionInfo> m_functions;
 };
 
@@ -81,9 +147,9 @@ void Init();
 void Shutdown();
 
 /// Map of named ports managed by the kernel, which can be retrieved using the ConnectToPort SVC.
-extern std::unordered_map<std::string, Kernel::SharedPtr<Interface>> g_kernel_named_ports;
+extern std::unordered_map<std::string, Kernel::SharedPtr<Kernel::ClientPort>> g_kernel_named_ports;
 /// Map of services registered with the "srv:" service, retrieved using GetServiceHandle.
-extern std::unordered_map<std::string, Kernel::SharedPtr<Interface>> g_srv_services;
+extern std::unordered_map<std::string, Kernel::SharedPtr<Kernel::ClientPort>> g_srv_services;
 
 /// Adds a service to the services table
 void AddService(Interface* interface_);
diff --git a/src/core/hle/service/soc_u.cpp b/src/core/hle/service/soc_u.cpp
index fd251fc0a..c3918cdd0 100644
--- a/src/core/hle/service/soc_u.cpp
+++ b/src/core/hle/service/soc_u.cpp
@@ -11,7 +11,7 @@
 #include "common/common_types.h"
 #include "common/logging/log.h"
 #include "common/scope_exit.h"
-#include "core/hle/kernel/session.h"
+#include "core/hle/kernel/server_session.h"
 #include "core/hle/result.h"
 #include "core/hle/service/soc_u.h"
 #include "core/memory.h"
diff --git a/src/core/hle/service/srv.cpp b/src/core/hle/service/srv.cpp
index f8df38c42..3bd787147 100644
--- a/src/core/hle/service/srv.cpp
+++ b/src/core/hle/service/srv.cpp
@@ -2,9 +2,13 @@
 // Licensed under GPLv2 or any later version
 // Refer to the license.txt file included.
 
+#include <tuple>
+
 #include "common/common_types.h"
 #include "common/logging/log.h"
+#include "core/hle/kernel/client_session.h"
 #include "core/hle/kernel/event.h"
+#include "core/hle/kernel/server_session.h"
 #include "core/hle/service/srv.h"
 
 namespace Service {
@@ -79,7 +83,15 @@ static void GetServiceHandle(Interface* self) {
     auto it = Service::g_srv_services.find(port_name);
 
     if (it != Service::g_srv_services.end()) {
-        cmd_buff[3] = Kernel::g_handle_table.Create(it->second).MoveFrom();
+        auto client_port = it->second;
+
+        auto client_session = client_port->Connect();
+        res = client_session.Code();
+
+        if (client_session.Succeeded()) {
+            // Return the client session
+            cmd_buff[3] = Kernel::g_handle_table.Create(*client_session).MoveFrom();
+        }
         LOG_TRACE(Service_SRV, "called port=%s, handle=0x%08X", port_name.c_str(), cmd_buff[3]);
     } else {
         LOG_ERROR(Service_SRV, "(UNIMPLEMENTED) called port=%s", port_name.c_str());