reorganize files

* src/ -> km/src/
* utils/ -> um/
* Move WDK 7.1-specific *.bat files to km/build/wdk7.1/
* Move WDK 8.1 Update 1 solutions to km/build/wdk8.1update/

40 files changed, 1594 insertions, 0 deletions

diff --git a/um/CMakeLists.txt b/um/CMakeLists.txt
new file mode 100644
index 0000000..31c8511
--- /dev/null
+++ b/um/CMakeLists.txt
@@ -0,0 +1,6 @@
+project(windows7_drivers_utils)
+
+add_subdirectory(libservice)
+
+add_subdirectory(libnt_path_converter)
+add_subdirectory(libsimple)
diff --git a/um/README.md b/um/README.md
new file mode 100644
index 0000000..f18091a
--- /dev/null
+++ b/um/README.md
@@ -0,0 +1,38 @@
+Driver utilities
+================
+
+A couple of usage examples are included along with the drivers.
+
+* [libservice]: Utilities to load/unload the drivers.
+* [libsimple]: [simple] driver usage examples.
+* [libnt_path_converter]: [nt_path_converter] driver usage examples.
+
+[libservice]: libservice/README.md
+[libsimple]: libsimple/README.md
+[simple]: ../km/src/simple
+[libnt_path_converter]: libnt_path_converter/README.md
+[nt_path_converter]: ../km/src/special/nt_path_converter
+
+Building the utilities
+----------------------
+
+Create the build files using CMake and build using Visual Studio.
+
+For example, using Visual Studio 2013 Update 4 for Windows Desktop (targetting
+x86):
+
+    > cd
+    C:\workspace\build\windows7-drivers
+
+    > cmake -G "Visual Studio 12 2013" C:\workspace\personal\windows7-drivers\um
+    ...
+
+    > msbuild windows7_drivers_utils.sln
+    ...
+
+See also
+--------
+
+* [License]
+
+[License]: ../README.md#license
diff --git a/um/libnt_path_converter/CMakeLists.txt b/um/libnt_path_converter/CMakeLists.txt
new file mode 100644
index 0000000..69f85d0
--- /dev/null
+++ b/um/libnt_path_converter/CMakeLists.txt
@@ -0,0 +1,10 @@
+project(libnt_path_converter)
+file(GLOB libnt_path_converter_sources "src/*.cpp")
+file(GLOB_RECURSE libnt_path_converter_headers "include/*.hpp")
+add_library(libnt_path_converter
+    ${libnt_path_converter_sources}
+    ${libnt_path_converter_headers})
+target_link_libraries(libnt_path_converter libservice)
+target_include_directories(libnt_path_converter PUBLIC include/)
+
+add_subdirectory(utils)
diff --git a/um/libnt_path_converter/README.md b/um/libnt_path_converter/README.md
new file mode 100644
index 0000000..74653dc
--- /dev/null
+++ b/um/libnt_path_converter/README.md
@@ -0,0 +1,31 @@
+nt_path_converter driver utilities
+==================================
+
+[nt_path_converter] driver usage examples.
+
+[nt_path_converter]: ../../km/src/special/nt_path_converter
+
+Usage
+-----
+
+### convert_nt_path.exe
+
+    Usage: convert_nt_path.exe [NT_PATH...]
+
+Converts a NT-style path to a DOS-style path.
+The NT namespace can be explored using the [WinObj] utility.
+For example:
+
+    > convert_nt_path.exe \Device\HarddiskVolume2\Windows
+    C:\Windows
+
+[WinObj]: https://technet.microsoft.com/en-us/library/bb896657.aspx
+
+See also
+--------
+
+* [Building the utilities]
+* [License]
+
+[Building the utilities]: ../README.md#building-the-utilities
+[License]: ../../README.md#license
diff --git a/um/libnt_path_converter/include/libnt_path_converter/all.hpp b/um/libnt_path_converter/include/libnt_path_converter/all.hpp
new file mode 100644
index 0000000..474b802
--- /dev/null
+++ b/um/libnt_path_converter/include/libnt_path_converter/all.hpp
@@ -0,0 +1,8 @@
+// Copyright (c) 2015 Egor Tensin <Egor.Tensin@gmail.com>
+// This file is part of the "Windows 7 drivers" project.
+// For details, see https://github.com/egor-tensin/windows7-drivers.
+// Distributed under the MIT License.
+
+#pragma once
+
+#include "device.hpp"
diff --git a/um/libnt_path_converter/include/libnt_path_converter/device.hpp b/um/libnt_path_converter/include/libnt_path_converter/device.hpp
new file mode 100644
index 0000000..e1d75fb
--- /dev/null
+++ b/um/libnt_path_converter/include/libnt_path_converter/device.hpp
@@ -0,0 +1,21 @@
+// Copyright (c) 2015 Egor Tensin <Egor.Tensin@gmail.com>
+// This file is part of the "Windows 7 drivers" project.
+// For details, see https://github.com/egor-tensin/windows7-drivers.
+// Distributed under the MIT License.
+
+#pragma once
+
+#include "libservice/all.hpp"
+
+#include <string>
+
+namespace libnt_path_converter
+{
+    class Device : libservice::Device
+    {
+    public:
+        Device();
+
+        std::wstring convert_nt_path(const std::wstring&);
+    };
+}
diff --git a/um/libnt_path_converter/src/device.cpp b/um/libnt_path_converter/src/device.cpp
new file mode 100644
index 0000000..90cd12f
--- /dev/null
+++ b/um/libnt_path_converter/src/device.cpp
@@ -0,0 +1,48 @@
+// Copyright (c) 2015 Egor Tensin <Egor.Tensin@gmail.com>
+// This file is part of the "Windows 7 drivers" project.
+// For details, see https://github.com/egor-tensin/windows7-drivers.
+// Distributed under the MIT License.
+
+#include "libnt_path_converter/device.hpp"
+
+#include "libservice/all.hpp"
+
+#include <Windows.h>
+
+#include <string>
+#include <vector>
+
+namespace libnt_path_converter
+{
+    namespace
+    {
+        const char* const device_path = "\\\\.\\nt_path_converter";
+        const auto control_code = CTL_CODE(0x8000, 0x800, METHOD_BUFFERED, FILE_ANY_ACCESS);
+    }
+
+    Device::Device()
+        : libservice::Device(libservice::Device::open(device_path))
+    { }
+
+    std::wstring Device::convert_nt_path(const std::wstring& src)
+    {
+        const auto in_buf = src.c_str();
+        const auto in_buf_size = (src.size() + 1) * sizeof(wchar_t);
+
+        const auto nbreq = get_required_output_size(
+            control_code,
+            in_buf,
+            in_buf_size);
+
+        std::vector<unsigned char> output(nbreq);
+
+        send_control_code(
+            control_code,
+            in_buf,
+            in_buf_size,
+            output.data(),
+            nbreq);
+
+        return reinterpret_cast<wchar_t*>(output.data());
+    }
+}
diff --git a/um/libnt_path_converter/utils/CMakeLists.txt b/um/libnt_path_converter/utils/CMakeLists.txt
new file mode 100644
index 0000000..9915995
--- /dev/null
+++ b/um/libnt_path_converter/utils/CMakeLists.txt
@@ -0,0 +1,2 @@
+add_executable(convert_nt_path convert_nt_path.cpp)
+target_link_libraries(convert_nt_path libnt_path_converter)
diff --git a/um/libnt_path_converter/utils/convert_nt_path.cpp b/um/libnt_path_converter/utils/convert_nt_path.cpp
new file mode 100644
index 0000000..0055db2
--- /dev/null
+++ b/um/libnt_path_converter/utils/convert_nt_path.cpp
@@ -0,0 +1,26 @@
+// Copyright (c) 2015 Egor Tensin <Egor.Tensin@gmail.com>
+// This file is part of the "Windows 7 drivers" project.
+// For details, see https://github.com/egor-tensin/windows7-drivers.
+// Distributed under the MIT License.
+
+#include "libnt_path_converter/all.hpp"
+
+#include <exception>
+#include <iostream>
+
+int wmain(int argc, wchar_t* argv[])
+{
+    try
+    {
+        libnt_path_converter::Device dev;
+        for (int i = 1; i < argc; ++i)
+            std::wcout << dev.convert_nt_path(argv[i]) << L"\n";
+    }
+    catch (const std::exception& e)
+    {
+        std::wcerr << e.what() << "\n";
+        return 1;
+    }
+
+    return 0;
+}
diff --git a/um/libservice/CMakeLists.txt b/um/libservice/CMakeLists.txt
new file mode 100644
index 0000000..34b3d13
--- /dev/null
+++ b/um/libservice/CMakeLists.txt
@@ -0,0 +1,10 @@
+file(GLOB libservice_sources "src/*.cpp")
+file(GLOB_RECURSE libservice_headers "include/*.hpp")
+add_library(libservice
+    ${libservice_sources}
+    ${libservice_headers})
+target_include_directories(libservice PUBLIC include)
+target_compile_definitions(libservice PRIVATE NOMINMAX)
+
+add_subdirectory(test)
+add_subdirectory(utils)
diff --git a/um/libservice/README.md b/um/libservice/README.md
new file mode 100644
index 0000000..f9fb601
--- /dev/null
+++ b/um/libservice/README.md
@@ -0,0 +1,53 @@
+Driver management utilities
+===========================
+
+Utilities to load/unload the drivers.
+
+Usage
+-----
+
+### install_service.exe
+
+    Usage: install_service.exe NAME SYS_PATH
+
+Installs a driver as a service.
+The same as
+
+    > sc create NAME type= kernel binPath= SYS_PATH
+
+### start_service.exe
+
+    Usage: start_service.exe NAME
+
+Starts the service `NAME` (loading the corresponding driver).
+The same as
+
+    > net start NAME
+
+### stop_service.exe
+
+    Usage: stop_service.exe NAME
+
+Stops the service `NAME` (unloading the corresponding driver).
+The same as
+
+    > net stop NAME
+
+### uninstall_service.exe
+
+    Usage: uninstall_service.exe NAME
+
+Uninstalls the service `NAME`, wiping the corresponding record from the
+registry.
+The same as
+
+    > sc delete NAME
+
+See also
+--------
+
+* [Building the utilities]
+* [License]
+
+[Building the utilities]: ../README.md#building-the-utilities
+[License]: ../../README.md#license
diff --git a/um/libservice/include/libservice/all.hpp b/um/libservice/include/libservice/all.hpp
new file mode 100644
index 0000000..a5761e0
--- /dev/null
+++ b/um/libservice/include/libservice/all.hpp
@@ -0,0 +1,15 @@
+// Copyright (c) 2015 Egor Tensin <Egor.Tensin@gmail.com>
+// This file is part of the "Windows 7 drivers" project.
+// For details, see https://github.com/egor-tensin/windows7-drivers.
+// Distributed under the MIT License.
+
+#pragma once
+
+#include "common.hpp"
+#include "device.hpp"
+#include "handle.hpp"
+#include "service.hpp"
+#include "service_handle.hpp"
+#include "service_manager.hpp"
+#include "singleton.hpp"
+#include "windows_error.hpp"
diff --git a/um/libservice/include/libservice/common.hpp b/um/libservice/include/libservice/common.hpp
new file mode 100644
index 0000000..a1c46fb
--- /dev/null
+++ b/um/libservice/include/libservice/common.hpp
@@ -0,0 +1,17 @@
+// Copyright (c) 2015 Egor Tensin <Egor.Tensin@gmail.com>
+// This file is part of the "Windows 7 drivers" project.
+// For details, see https://github.com/egor-tensin/windows7-drivers.
+// Distributed under the MIT License.
+
+#pragma once
+
+#define LIBSERVICE_FILE_PATH __FILE__
+#define LIBSERVICE_LINE_NUMBER __LINE__
+#define LIBSERVICE_FUNCTION_NAME __FUNCTION__
+
+#define LIBSERVICE_TO_STRING(s) LIBSERVICE_TO_STRING_(s)
+#define LIBSERVICE_TO_STRING_(s) #s
+
+#define LIBSERVICE_LINE_NUMBER_STRING LIBSERVICE_TO_STRING(LIBSERVICE_LINE_NUMBER)
+
+#define LIBSERVICE_NOEXCEPT throw()
diff --git a/um/libservice/include/libservice/device.hpp b/um/libservice/include/libservice/device.hpp
new file mode 100644
index 0000000..ac292c8
--- /dev/null
+++ b/um/libservice/include/libservice/device.hpp
@@ -0,0 +1,75 @@
+// Copyright (c) 2015 Egor Tensin <Egor.Tensin@gmail.com>
+// This file is part of the "Windows 7 drivers" project.
+// For details, see https://github.com/egor-tensin/windows7-drivers.
+// Distributed under the MIT License.
+
+#pragma once
+
+#include "common.hpp"
+#include "handle.hpp"
+
+#include <Windows.h>
+
+#include <cstddef>
+
+#include <string>
+#include <utility>
+
+namespace libservice
+{
+    class Device
+    {
+    public:
+        typedef DWORD Code;
+
+        static Device open(const std::string& path);
+
+        Device(Device&& other) LIBSERVICE_NOEXCEPT
+        {
+            swap(other);
+        }
+
+        Device& operator=(Device other) LIBSERVICE_NOEXCEPT
+        {
+            swap(other);
+            return *this;
+        }
+
+        void swap(Device& other) LIBSERVICE_NOEXCEPT
+        {
+            using std::swap;
+            swap(handle, other.handle);
+        }
+
+        std::size_t get_required_output_size(
+            Code code,
+            const void* in_buf,
+            std::size_t in_buf_size) const;
+
+        std::size_t send_control_code(
+            Code code,
+            const void* in_buf,
+            std::size_t in_buf_size,
+            void* out_buf,
+            std::size_t out_buf_size) const;
+
+    private:
+        Device(Handle handle)
+            : handle(std::move(handle))
+        { }
+
+        Handle handle;
+
+        Device(const Device&) = delete;
+    };
+
+    void swap(Device&, Device&) LIBSERVICE_NOEXCEPT;
+}
+
+namespace std
+{
+    template <>
+    void swap<libservice::Device>(
+        libservice::Device&,
+        libservice::Device&) LIBSERVICE_NOEXCEPT;
+}
diff --git a/um/libservice/include/libservice/handle.hpp b/um/libservice/include/libservice/handle.hpp
new file mode 100644
index 0000000..5e351d2
--- /dev/null
+++ b/um/libservice/include/libservice/handle.hpp
@@ -0,0 +1,77 @@
+// Copyright (c) 2015 Egor Tensin <Egor.Tensin@gmail.com>
+// This file is part of the "Windows 7 drivers" project.
+// For details, see https://github.com/egor-tensin/windows7-drivers.
+// Distributed under the MIT License.
+
+#pragma once
+
+#include "common.hpp"
+
+#include <Windows.h>
+
+#include <memory>
+#include <type_traits>
+#include <utility>
+
+namespace libservice
+{
+    class Handle
+    {
+    public:
+        Handle() = default;
+
+        Handle(HANDLE raw)
+            : impl(raw)
+        { }
+
+        Handle(Handle&& other) LIBSERVICE_NOEXCEPT
+        {
+            swap(other);
+        }
+
+        Handle& operator=(Handle other) LIBSERVICE_NOEXCEPT
+        {
+            swap(other);
+            return *this;
+        }
+
+        operator bool() const
+        {
+            return static_cast<bool>(impl);
+        }
+
+        operator HANDLE() const
+        {
+            return impl.get();
+        }
+
+        void swap(Handle& other) LIBSERVICE_NOEXCEPT
+        {
+            using std::swap;
+            swap(impl, other.impl);
+        }
+
+    private:
+        struct Deleter
+        {
+            void operator()(HANDLE raw)
+            {
+                CloseHandle(raw);
+            }
+        };
+
+        std::unique_ptr<std::remove_pointer<HANDLE>::type, Deleter> impl;
+
+        Handle(const Handle&) = delete;
+    };
+
+    void swap(Handle& a, Handle& b) LIBSERVICE_NOEXCEPT;
+}
+
+namespace std
+{
+    template <>
+    void swap<libservice::Handle>(
+        libservice::Handle& a,
+        libservice::Handle& b) LIBSERVICE_NOEXCEPT;
+}
diff --git a/um/libservice/include/libservice/service.hpp b/um/libservice/include/libservice/service.hpp
new file mode 100644
index 0000000..089f790
--- /dev/null
+++ b/um/libservice/include/libservice/service.hpp
@@ -0,0 +1,73 @@
+// Copyright (c) 2015 Egor Tensin <Egor.Tensin@gmail.com>
+// This file is part of the "Windows 7 drivers" project.
+// For details, see https://github.com/egor-tensin/windows7-drivers.
+// Distributed under the MIT License.
+
+#pragma once
+
+#include "common.hpp"
+#include "service_handle.hpp"
+#include "service_manager.hpp"
+
+#include <string>
+#include <utility>
+
+namespace libservice
+{
+    class Service
+    {
+    public:
+        static bool exists(
+            const ServiceManager&,
+            const std::string& name);
+
+        static Service open(
+            const ServiceManager&,
+            const std::string& name);
+
+        static Service install(
+            const ServiceManager&,
+            const std::string& name,
+            const std::string& bin_path);
+
+        void start() const;
+        void stop() const;
+        void uninstall() const;
+
+        Service(Service&& other) LIBSERVICE_NOEXCEPT
+        {
+            swap(other);
+        }
+
+        Service& operator=(Service other) LIBSERVICE_NOEXCEPT
+        {
+            swap(other);
+            return *this;
+        }
+
+        void swap(Service& other) LIBSERVICE_NOEXCEPT
+        {
+            using std::swap;
+            swap(handle, other.handle);
+        }
+
+    private:
+        Service(ServiceHandle handle)
+            : handle(std::move(handle))
+        { }
+
+        ServiceHandle handle;
+
+        Service(const Service&) = delete;
+    };
+
+    void swap(Service&, Service&) LIBSERVICE_NOEXCEPT;
+}
+
+namespace std
+{
+    template <>
+    void swap<libservice::Service>(
+        libservice::Service&,
+        libservice::Service&) LIBSERVICE_NOEXCEPT;
+}
diff --git a/um/libservice/include/libservice/service_handle.hpp b/um/libservice/include/libservice/service_handle.hpp
new file mode 100644
index 0000000..2883ff3
--- /dev/null
+++ b/um/libservice/include/libservice/service_handle.hpp
@@ -0,0 +1,76 @@
+// Copyright (c) 2015 Egor Tensin <Egor.Tensin@gmail.com>
+// This file is part of the "Windows 7 drivers" project.
+// For details, see https://github.com/egor-tensin/windows7-drivers.
+// Distributed under the MIT License.
+
+#pragma once
+
+#include "common.hpp"
+
+#include <Windows.h>
+
+#include <memory>
+#include <utility>
+
+namespace libservice
+{
+    class ServiceHandle
+    {
+    public:
+        ServiceHandle() = default;
+
+        ServiceHandle(SC_HANDLE raw)
+            : impl(raw)
+        { }
+
+        ServiceHandle(ServiceHandle&& other) LIBSERVICE_NOEXCEPT
+        {
+            swap(other);
+        }
+
+        ServiceHandle& operator=(ServiceHandle other) LIBSERVICE_NOEXCEPT
+        {
+            swap(other);
+            return *this;
+        }
+
+        operator bool() const
+        {
+            return static_cast<bool>(impl);
+        }
+
+        operator SC_HANDLE() const
+        {
+            return impl.get();
+        }
+
+        void swap(ServiceHandle& other) LIBSERVICE_NOEXCEPT
+        {
+            using std::swap;
+            swap(impl, other.impl);
+        }
+
+    private:
+        struct Deleter
+        {
+            void operator()(SC_HANDLE raw)
+            {
+                CloseServiceHandle(raw);
+            }
+        };
+
+        std::unique_ptr<SC_HANDLE__, Deleter> impl;
+
+        ServiceHandle(const ServiceHandle&) = delete;
+    };
+
+    void swap(ServiceHandle&, ServiceHandle&) LIBSERVICE_NOEXCEPT;
+}
+
+namespace std
+{
+    template <>
+    void swap<libservice::ServiceHandle>(
+        libservice::ServiceHandle&,
+        libservice::ServiceHandle&) LIBSERVICE_NOEXCEPT;
+}
diff --git a/um/libservice/include/libservice/service_manager.hpp b/um/libservice/include/libservice/service_manager.hpp
new file mode 100644
index 0000000..80e6f12
--- /dev/null
+++ b/um/libservice/include/libservice/service_manager.hpp
@@ -0,0 +1,63 @@
+// Copyright (c) 2015 Egor Tensin <Egor.Tensin@gmail.com>
+// This file is part of the "Windows 7 drivers" project.
+// For details, see https://github.com/egor-tensin/windows7-drivers.
+// Distributed under the MIT License.
+
+#pragma once
+
+#include "common.hpp"
+#include "service_handle.hpp"
+
+#include <Windows.h>
+
+#include <utility>
+
+namespace libservice
+{
+    class ServiceManager
+    {
+    public:
+        static ServiceManager open();
+
+        ServiceManager(ServiceManager&& other) LIBSERVICE_NOEXCEPT
+        {
+            swap(other);
+        }
+
+        ServiceManager& operator=(ServiceManager other) LIBSERVICE_NOEXCEPT
+        {
+            swap(other);
+            return *this;
+        }
+
+        void swap(ServiceManager& other) LIBSERVICE_NOEXCEPT
+        {
+            using std::swap;
+            swap(handle, other.handle);
+        }
+
+        operator SC_HANDLE() const
+        {
+            return handle;
+        }
+
+    private:
+        ServiceManager(ServiceHandle handle)
+            : handle(std::move(handle))
+        { }
+
+        ServiceHandle handle;
+
+        ServiceManager(const ServiceManager&) = delete;
+    };
+
+    void swap(ServiceManager& a, ServiceManager& b) LIBSERVICE_NOEXCEPT;
+}
+
+namespace std
+{
+    template <>
+    void swap<libservice::ServiceManager>(
+        libservice::ServiceManager&,
+        libservice::ServiceManager&) LIBSERVICE_NOEXCEPT;
+}
diff --git a/um/libservice/include/libservice/singleton.hpp b/um/libservice/include/libservice/singleton.hpp
new file mode 100644
index 0000000..1c7b1a7
--- /dev/null
+++ b/um/libservice/include/libservice/singleton.hpp
@@ -0,0 +1,43 @@
+// Copyright (c) 2015 Egor Tensin <Egor.Tensin@gmail.com>
+// This file is part of the "Windows 7 drivers" project.
+// For details, see https://github.com/egor-tensin/windows7-drivers.
+// Distributed under the MIT License.
+
+#pragma once
+
+#include <mutex>
+
+namespace libservice
+{
+    template <typename DerivedT>
+    class Singleton
+    {
+    public:
+        static DerivedT& get()
+        {
+            std::call_once(initialized, initialize);
+            return get_unsafe();
+        }
+
+    protected:
+        Singleton() = default;
+        virtual ~Singleton() = default;
+
+    private:
+        static void initialize()
+        {
+            get_unsafe();
+        }
+
+        static DerivedT& get_unsafe()
+        {
+            static DerivedT instance;
+            return instance;
+        }
+
+        static std::once_flag initialized;
+    };
+
+    template <typename DerivedT>
+    std::once_flag Singleton<DerivedT>::initialized;
+}
diff --git a/um/libservice/include/libservice/windows_error.hpp b/um/libservice/include/libservice/windows_error.hpp
new file mode 100644
index 0000000..f7ac90e
--- /dev/null
+++ b/um/libservice/include/libservice/windows_error.hpp
@@ -0,0 +1,31 @@
+// Copyright (c) 2015 Egor Tensin <Egor.Tensin@gmail.com>
+// This file is part of the "Windows 7 drivers" project.
+// For details, see https://github.com/egor-tensin/windows7-drivers.
+// Distributed under the MIT License.
+
+#pragma once
+
+#include "common.hpp"
+#include "singleton.hpp"
+
+#include <string>
+#include <system_error>
+
+namespace libservice
+{
+    class WindowsErrorCategory
+        : public std::error_category
+        , public Singleton<WindowsErrorCategory>
+    {
+    public:
+        const char* name() const LIBSERVICE_NOEXCEPT { return "Windows"; }
+
+        std::string message(int) const;
+
+    private:
+        friend class Singleton<WindowsErrorCategory>;
+    };
+}
+
+#define LIBSERVICE_ERROR_PREFIX \
+    "Error in function '" LIBSERVICE_FUNCTION_NAME "' at file '" LIBSERVICE_FILE_PATH "', line " LIBSERVICE_LINE_NUMBER_STRING
diff --git a/um/libservice/src/device.cpp b/um/libservice/src/device.cpp
new file mode 100644
index 0000000..5643106
--- /dev/null
+++ b/um/libservice/src/device.cpp
@@ -0,0 +1,136 @@
+// Copyright (c) 2015 Egor Tensin <Egor.Tensin@gmail.com>
+// This file is part of the "Windows 7 drivers" project.
+// For details, see https://github.com/egor-tensin/windows7-drivers.
+// Distributed under the MIT License.
+
+#include "libservice/all.hpp"
+
+#include <Windows.h>
+
+#include <cstddef>
+
+#include <limits>
+#include <stdexcept>
+#include <string>
+#include <system_error>
+#include <utility>
+
+namespace libservice
+{
+    namespace
+    {
+        Handle open_device(const std::string& path)
+        {
+            const auto raw = CreateFileA(
+                path.c_str(),
+                GENERIC_READ | GENERIC_WRITE,
+                0,
+                NULL,
+                OPEN_EXISTING,
+                FILE_ATTRIBUTE_NORMAL,
+                NULL);
+
+            if (INVALID_HANDLE_VALUE == raw)
+            {
+                const auto ec = GetLastError();
+                throw std::system_error(
+                    ec, WindowsErrorCategory::get(), LIBSERVICE_ERROR_PREFIX);
+            }
+
+            return Handle(raw);
+        }
+    }
+
+    Device Device::open(const std::string& path)
+    {
+        return Device(open_device(path));
+    }
+
+    std::size_t Device::get_required_output_size(
+        Code code,
+        const void* in_buf,
+        std::size_t in_buf_size) const
+    {
+        DWORD nbreq;
+
+        if (in_buf_size > std::numeric_limits<DWORD>::max())
+            throw std::range_error("input buffer size is too large");
+
+        std::size_t nbwritten = DeviceIoControl(
+            handle,
+            code,
+            const_cast<void*>(in_buf),
+            static_cast<DWORD>(in_buf_size),
+            NULL,
+            0,
+            &nbreq,
+            NULL);
+
+        if (0 == nbwritten)
+        {
+            const auto ec = GetLastError();
+
+            switch (ec)
+            {
+                case ERROR_MORE_DATA:
+                    return nbreq;
+
+                default:
+                    throw std::system_error(
+                        ec, WindowsErrorCategory::get(), LIBSERVICE_ERROR_PREFIX);
+            }
+        }
+
+        return nbwritten;
+    }
+
+    std::size_t Device::send_control_code(
+        Code code,
+        const void* in_buf,
+        std::size_t in_buf_size,
+        void* out_buf,
+        std::size_t out_buf_size) const
+    {
+        DWORD nbreq;
+
+        if (in_buf_size > std::numeric_limits<DWORD>::max())
+            throw std::range_error("input buffer size is too large");
+        if (out_buf_size > std::numeric_limits<DWORD>::max())
+            throw std::range_error("output buffer size is too large");
+
+        std::size_t nbwritten = DeviceIoControl(
+            handle,
+            code,
+            const_cast<void*>(in_buf),
+            static_cast<DWORD>(in_buf_size),
+            out_buf,
+            static_cast<DWORD>(out_buf_size),
+            &nbreq,
+            NULL);
+
+        if (0 == nbwritten)
+        {
+            const auto ec = GetLastError();
+            throw std::system_error(
+                ec, WindowsErrorCategory::get(), LIBSERVICE_ERROR_PREFIX);
+        }
+
+        return nbwritten;
+    }
+
+    void swap(Device& a, Device& b) LIBSERVICE_NOEXCEPT
+    {
+        a.swap(b);
+    }
+}
+
+namespace std
+{
+    template <>
+    void swap<libservice::Device>(
+        libservice::Device& a,
+        libservice::Device& b)
+    {
+        a.swap(b);
+    }
+}
diff --git a/um/libservice/src/handle.cpp b/um/libservice/src/handle.cpp
new file mode 100644
index 0000000..7567781
--- /dev/null
+++ b/um/libservice/src/handle.cpp
@@ -0,0 +1,27 @@
+// Copyright (c) 2015 Egor Tensin <Egor.Tensin@gmail.com>
+// This file is part of the "Windows 7 drivers" project.
+// For details, see https://github.com/egor-tensin/windows7-drivers.
+// Distributed under the MIT License.
+
+#include "libservice/all.hpp"
+
+#include <utility>
+
+namespace libservice
+{
+    void swap(Handle& a, Handle& b) LIBSERVICE_NOEXCEPT
+    {
+        a.swap(b);
+    }
+}
+
+namespace std
+{
+    template <>
+    void swap<libservice::Handle>(
+        libservice::Handle& a,
+        libservice::Handle& b) LIBSERVICE_NOEXCEPT
+    {
+        a.swap(b);
+    }
+}
diff --git a/um/libservice/src/service.cpp b/um/libservice/src/service.cpp
new file mode 100644
index 0000000..8b5e043
--- /dev/null
+++ b/um/libservice/src/service.cpp
@@ -0,0 +1,276 @@
+// Copyright (c) 2015 Egor Tensin <Egor.Tensin@gmail.com>
+// This file is part of the "Windows 7 drivers" project.
+// For details, see https://github.com/egor-tensin/windows7-drivers.
+// Distributed under the MIT License.
+
+#include "libservice/all.hpp"
+
+#include <Windows.h>
+
+#include <string>
+#include <system_error>
+#include <utility>
+#include <vector>
+
+namespace libservice
+{
+    namespace
+    {
+        ServiceHandle open_service(
+            const ServiceManager& mgr,
+            const std::string& name)
+        {
+            const auto raw = OpenServiceA(
+                mgr,
+                name.c_str(),
+                SERVICE_ALL_ACCESS);
+
+            if (NULL == raw)
+            {
+                const auto ec = GetLastError();
+                throw std::system_error(
+                    ec, WindowsErrorCategory::get(), LIBSERVICE_ERROR_PREFIX);
+            }
+
+            return raw;
+        }
+
+        ServiceHandle install_service(
+            const ServiceManager& mgr,
+            const std::string& name,
+            const std::string& bin_path)
+        {
+            const auto raw = CreateServiceA(
+                mgr,
+                name.c_str(),
+                name.c_str(),
+                SERVICE_ALL_ACCESS,
+                SERVICE_KERNEL_DRIVER,
+                SERVICE_DEMAND_START,
+                SERVICE_ERROR_NORMAL,
+                bin_path.c_str(),
+                NULL,
+                NULL,
+                NULL,
+                NULL,
+                NULL);
+
+            if (NULL == raw)
+            {
+                const auto ec = GetLastError();
+                throw std::system_error(
+                    ec, WindowsErrorCategory::get(), LIBSERVICE_ERROR_PREFIX);
+            }
+
+            return raw;
+        }
+
+        void start_service(const ServiceHandle& handle)
+        {
+            if (!StartService(handle, 0, NULL))
+            {
+                const auto ec = GetLastError();
+                throw std::system_error(
+                    ec, WindowsErrorCategory::get(), LIBSERVICE_ERROR_PREFIX);
+            }
+        }
+
+        void stop_service(const ServiceHandle& handle)
+        {
+            SERVICE_STATUS service_status;
+
+            if (!ControlService(handle, SERVICE_CONTROL_STOP, &service_status))
+            {
+                const auto ec = GetLastError();
+                throw std::system_error(
+                    ec, WindowsErrorCategory::get(), LIBSERVICE_ERROR_PREFIX);
+            }
+        }
+
+        void uninstall_service(const ServiceHandle& handle)
+        {
+            if (!DeleteService(handle))
+            {
+                const auto ec = GetLastError();
+                throw std::system_error(
+                    ec, WindowsErrorCategory::get(), LIBSERVICE_ERROR_PREFIX);
+            }
+        }
+
+        bool service_exists(
+            const ServiceManager& mgr,
+            const std::string& name)
+        {
+            const auto raw = OpenServiceA(
+                mgr,
+                name.c_str(),
+                SERVICE_QUERY_STATUS);
+
+            if (NULL != raw)
+            {
+                ServiceHandle handle(raw);
+                return true;
+            }
+
+            const auto ec = GetLastError();
+
+            switch (ec)
+            {
+                case ERROR_SERVICE_DOES_NOT_EXIST:
+                    return false;
+
+                default:
+                    throw std::system_error(
+                        ec, WindowsErrorCategory::get(), LIBSERVICE_ERROR_PREFIX);
+            }
+        }
+
+        SERVICE_STATUS_PROCESS query_service_status(const ServiceHandle& handle)
+        {
+            SERVICE_STATUS_PROCESS status;
+            DWORD nbreq;
+
+            const auto buf_ptr = reinterpret_cast<BYTE*>(&status);
+            const auto buf_size = sizeof(status);
+
+            if (!QueryServiceStatusEx(
+                handle, SC_STATUS_PROCESS_INFO, buf_ptr, buf_size, &nbreq))
+            {
+                const auto ec = GetLastError();
+                throw std::system_error(
+                    ec, WindowsErrorCategory::get(), LIBSERVICE_ERROR_PREFIX);
+            }
+
+            return status;
+        }
+
+        DWORD query_service_state(const ServiceHandle& handle)
+        {
+            return query_service_status(handle).dwCurrentState;
+        }
+
+        SERVICE_STATUS_PROCESS wait_for_service_state(
+            const ServiceHandle& handle,
+            const DWORD desired_state)
+        {
+            auto status = query_service_status(handle);
+
+            DWORD old_timestamp = GetTickCount();
+
+            DWORD old_check_point = status.dwCheckPoint;
+            DWORD old_wait_hint = status.dwWaitHint;
+
+            while (desired_state != status.dwCurrentState)
+            {
+                DWORD wait_time = old_wait_hint / 10;
+
+                if (wait_time < 1000)
+                    wait_time = 1000;
+                else if (wait_time > 10000)
+                    wait_time = 10000;
+
+                Sleep(wait_time);
+
+                status = query_service_status(handle);
+
+                if (desired_state == status.dwCurrentState)
+                    break;
+
+                if (status.dwCheckPoint > old_check_point)
+                {
+                    old_timestamp = GetTickCount();
+
+                    old_check_point = status.dwCheckPoint;
+                    old_wait_hint = status.dwWaitHint;
+                }
+                else if (GetTickCount() - old_timestamp > old_wait_hint)
+                {
+                    return status;
+                }
+            }
+
+            return status;
+        }
+    }
+
+    Service Service::open(
+        const ServiceManager& mgr,
+        const std::string& name)
+    {
+        return open_service(mgr, name);
+    }
+
+    Service Service::install(
+        const ServiceManager& mgr,
+        const std::string& name,
+        const std::string& bin_path)
+    {
+        return install_service(mgr, name, bin_path);
+    }
+
+    bool Service::exists(
+        const ServiceManager& mgr,
+        const std::string& name)
+    {
+        return service_exists(mgr, name);
+    }
+
+    void Service::start() const
+    {
+        const auto state = query_service_state(handle);
+
+        switch (state)
+        {
+            case SERVICE_STOPPED:
+                break;
+
+            case SERVICE_STOP_PENDING:
+                wait_for_service_state(handle, SERVICE_STOPPED);
+                break;
+
+            default:
+                return;
+        }
+
+        start_service(handle);
+        wait_for_service_state(handle, SERVICE_RUNNING);
+    }
+
+    void Service::stop() const
+    {
+        switch (query_service_state(handle))
+        {
+            case SERVICE_STOPPED:
+                return;
+
+            case SERVICE_STOP_PENDING:
+                wait_for_service_state(handle, SERVICE_STOPPED);
+                return;
+        }
+
+        stop_service(handle);
+        wait_for_service_state(handle, SERVICE_STOPPED);
+    }
+
+    void Service::uninstall() const
+    {
+        stop();
+        uninstall_service(handle);
+    }
+
+    void swap(Service& a, Service& b) LIBSERVICE_NOEXCEPT
+    {
+        a.swap(b);
+    }
+}
+
+namespace std
+{
+    template <>
+    void swap<libservice::Service>(
+        libservice::Service& a,
+        libservice::Service& b) LIBSERVICE_NOEXCEPT
+    {
+        a.swap(b);
+    }
+}
diff --git a/um/libservice/src/service_handle.cpp b/um/libservice/src/service_handle.cpp
new file mode 100644
index 0000000..adce7f0
--- /dev/null
+++ b/um/libservice/src/service_handle.cpp
@@ -0,0 +1,27 @@
+// Copyright (c) 2015 Egor Tensin <Egor.Tensin@gmail.com>
+// This file is part of the "Windows 7 drivers" project.
+// For details, see https://github.com/egor-tensin/windows7-drivers.
+// Distributed under the MIT License.
+
+#include "libservice/all.hpp"
+
+#include <utility>
+
+namespace libservice
+{
+    void swap(ServiceHandle& a, ServiceHandle& b) LIBSERVICE_NOEXCEPT
+    {
+        a.swap(b);
+    }
+}
+
+namespace std
+{
+    template <>
+    void swap<libservice::ServiceHandle>(
+        libservice::ServiceHandle& a,
+        libservice::ServiceHandle& b) LIBSERVICE_NOEXCEPT
+    {
+        a.swap(b);
+    }
+}
diff --git a/um/libservice/src/service_manager.cpp b/um/libservice/src/service_manager.cpp
new file mode 100644
index 0000000..61662de
--- /dev/null
+++ b/um/libservice/src/service_manager.cpp
@@ -0,0 +1,44 @@
+// Copyright (c) 2015 Egor Tensin <Egor.Tensin@gmail.com>
+// This file is part of the "Windows 7 drivers" project.
+// For details, see https://github.com/egor-tensin/windows7-drivers.
+// Distributed under the MIT License.
+
+#include "libservice/all.hpp"
+
+#include <Windows.h>
+
+#include <system_error>
+#include <utility>
+
+namespace libservice
+{
+    ServiceManager ServiceManager::open()
+    {
+        SC_HANDLE raw = OpenSCManager(NULL, NULL, SC_MANAGER_ALL_ACCESS);
+
+        if (NULL == raw)
+        {
+            const auto ec = GetLastError();
+            throw std::system_error(
+                ec, WindowsErrorCategory::get(), LIBSERVICE_ERROR_PREFIX);
+        }
+
+        return ServiceHandle(raw);
+    }
+
+    void swap(ServiceManager& a, ServiceManager& b) LIBSERVICE_NOEXCEPT
+    {
+        a.swap(b);
+    }
+}
+
+namespace std
+{
+    template <>
+    void swap<libservice::ServiceManager>(
+        libservice::ServiceManager& a,
+        libservice::ServiceManager& b) LIBSERVICE_NOEXCEPT
+    {
+        a.swap(b);
+    }
+}
diff --git a/um/libservice/src/windows_error.cpp b/um/libservice/src/windows_error.cpp
new file mode 100644
index 0000000..f27018b
--- /dev/null
+++ b/um/libservice/src/windows_error.cpp
@@ -0,0 +1,39 @@
+// Copyright (c) 2015 Egor Tensin <Egor.Tensin@gmail.com>
+// This file is part of the "Windows 7 drivers" project.
+// For details, see https://github.com/egor-tensin/windows7-drivers.
+// Distributed under the MIT License.
+
+#include "libservice/all.hpp"
+
+#include <Windows.h>
+
+#include <string>
+
+namespace libservice
+{
+    std::string WindowsErrorCategory::message(int code) const
+    {
+        char* buf_ptr;
+
+        const auto nbwritten = FormatMessageA(
+            FORMAT_MESSAGE_ALLOCATE_BUFFER
+                | FORMAT_MESSAGE_FROM_SYSTEM
+                | FORMAT_MESSAGE_IGNORE_INSERTS,
+            NULL,
+            code,
+            MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
+            reinterpret_cast<char*>(&buf_ptr),
+            0,
+            NULL);
+
+        if (0 == nbwritten)
+        {
+            LocalFree(buf_ptr);
+            return "Couldn't format error message";
+        }
+
+        std::string str(buf_ptr, nbwritten - 2);
+        LocalFree(buf_ptr);
+        return str;
+    }
+}
diff --git a/um/libservice/test/CMakeLists.txt b/um/libservice/test/CMakeLists.txt
new file mode 100644
index 0000000..4780deb
--- /dev/null
+++ b/um/libservice/test/CMakeLists.txt
@@ -0,0 +1,4 @@
+add_executable(libservice_test_windows_error windows_error.cpp)
+target_link_libraries(libservice_test_windows_error libservice)
+set_target_properties(libservice_test_windows_error PROPERTIES
+    OUTPUT_NAME windows_error)
diff --git a/um/libservice/test/windows_error.cpp b/um/libservice/test/windows_error.cpp
new file mode 100644
index 0000000..b909670
--- /dev/null
+++ b/um/libservice/test/windows_error.cpp
@@ -0,0 +1,29 @@
+// Copyright (c) 2015 Egor Tensin <Egor.Tensin@gmail.com>
+// This file is part of the "Windows 7 drivers" project.
+// For details, see https://github.com/egor-tensin/windows7-drivers.
+// Distributed under the MIT License.
+
+#include "libservice/all.hpp"
+
+#include <Windows.h>
+
+#include <exception>
+#include <iostream>
+#include <system_error>
+
+int main()
+{
+    try
+    {
+        throw std::system_error(
+            ERROR_FILE_NOT_FOUND,
+            libservice::WindowsErrorCategory::get(),
+            LIBSERVICE_ERROR_PREFIX);
+    }
+    catch (const std::exception& e)
+    {
+        std::cerr << e.what() << "\n";
+        return 1;
+    }
+    return 0;
+}
diff --git a/um/libservice/utils/CMakeLists.txt b/um/libservice/utils/CMakeLists.txt
new file mode 100644
index 0000000..061ab25
--- /dev/null
+++ b/um/libservice/utils/CMakeLists.txt
@@ -0,0 +1,11 @@
+add_executable(install_service install_service.cpp)
+target_link_libraries(install_service libservice)
+
+add_executable(start_service start_service.cpp)
+target_link_libraries(start_service libservice)
+
+add_executable(stop_service stop_service.cpp)
+target_link_libraries(stop_service libservice)
+
+add_executable(uninstall_service uninstall_service.cpp)
+target_link_libraries(uninstall_service libservice)
diff --git a/um/libservice/utils/install_service.cpp b/um/libservice/utils/install_service.cpp
new file mode 100644
index 0000000..f36af75
--- /dev/null
+++ b/um/libservice/utils/install_service.cpp
@@ -0,0 +1,29 @@
+// Copyright (c) 2015 Egor Tensin <Egor.Tensin@gmail.com>
+// This file is part of the "Windows 7 drivers" project.
+// For details, see https://github.com/egor-tensin/windows7-drivers.
+// Distributed under the MIT License.
+
+#include "libservice/all.hpp"
+
+#include <exception>
+#include <iostream>
+
+int main(int argc, char* argv[])
+{
+    if (argc != 3)
+    {
+        std::cout << "Usage: " << argv[0] << " NAME SYS_PATH\n";
+        return 1;
+    }
+
+    try
+    {
+        libservice::Service::install(libservice::ServiceManager::open(), argv[1], argv[2]);
+    }
+    catch (const std::exception& e)
+    {
+        std::cerr << e.what() << "\n";
+        return 1;
+    }
+    return 0;
+}
diff --git a/um/libservice/utils/start_service.cpp b/um/libservice/utils/start_service.cpp
new file mode 100644
index 0000000..fafee53
--- /dev/null
+++ b/um/libservice/utils/start_service.cpp
@@ -0,0 +1,29 @@
+// Copyright (c) 2015 Egor Tensin <Egor.Tensin@gmail.com>
+// This file is part of the "Windows 7 drivers" project.
+// For details, see https://github.com/egor-tensin/windows7-drivers.
+// Distributed under the MIT License.
+
+#include "libservice/all.hpp"
+
+#include <exception>
+#include <iostream>
+
+int main(int argc, char* argv[])
+{
+    if (argc != 2)
+    {
+        std::cout << "Usage: " << argv[0] << " NAME\n";
+        return 1;
+    }
+
+    try
+    {
+        libservice::Service::open(libservice::ServiceManager::open(), argv[1]).start();
+    }
+    catch (const std::exception& e)
+    {
+        std::cerr << e.what() << "\n";
+        return 1;
+    }
+    return 0;
+}
diff --git a/um/libservice/utils/stop_service.cpp b/um/libservice/utils/stop_service.cpp
new file mode 100644
index 0000000..800c7a9
--- /dev/null
+++ b/um/libservice/utils/stop_service.cpp
@@ -0,0 +1,29 @@
+// Copyright (c) 2015 Egor Tensin <Egor.Tensin@gmail.com>
+// This file is part of the "Windows 7 drivers" project.
+// For details, see https://github.com/egor-tensin/windows7-drivers.
+// Distributed under the MIT License.
+
+#include "libservice/all.hpp"
+
+#include <exception>
+#include <iostream>
+
+int main(int argc, char* argv[])
+{
+    if (argc != 2)
+    {
+        std::cout << "Usage: " << argv[0] << " NAME\n";
+        return 1;
+    }
+
+    try
+    {
+        libservice::Service::open(libservice::ServiceManager::open(), argv[1]).stop();
+    }
+    catch (const std::exception& e)
+    {
+        std::cerr << e.what() << "\n";
+        return 1;
+    }
+    return 0;
+}
diff --git a/um/libservice/utils/uninstall_service.cpp b/um/libservice/utils/uninstall_service.cpp
new file mode 100644
index 0000000..395bb51
--- /dev/null
+++ b/um/libservice/utils/uninstall_service.cpp
@@ -0,0 +1,29 @@
+// Copyright (c) 2015 Egor Tensin <Egor.Tensin@gmail.com>
+// This file is part of the "Windows 7 drivers" project.
+// For details, see https://github.com/egor-tensin/windows7-drivers.
+// Distributed under the MIT License.
+
+#include "libservice/all.hpp"
+
+#include <exception>
+#include <iostream>
+
+int main(int argc, char* argv[])
+{
+    if (argc != 2)
+    {
+        std::cout << "Usage: " << argv[0] << " NAME\n";
+        return 1;
+    }
+
+    try
+    {
+        libservice::Service::open(libservice::ServiceManager::open(), argv[1]).uninstall();
+    }
+    catch (const std::exception& e)
+    {
+        std::cerr << e.what() << "\n";
+        return 1;
+    }
+    return 0;
+}
diff --git a/um/libsimple/CMakeLists.txt b/um/libsimple/CMakeLists.txt
new file mode 100644
index 0000000..ff61bd7
--- /dev/null
+++ b/um/libsimple/CMakeLists.txt
@@ -0,0 +1,9 @@
+file(GLOB_RECURSE libsimple_headers "include/*.hpp")
+file(GLOB libsimple_sources "src/*.cpp")
+add_library(libsimple
+    ${libsimple_sources}
+    ${libsimple_headers})
+target_link_libraries(libsimple libservice)
+target_include_directories(libsimple PUBLIC include/)
+
+add_subdirectory(utils)
diff --git a/um/libsimple/README.md b/um/libsimple/README.md
new file mode 100644
index 0000000..ac00d63
--- /dev/null
+++ b/um/libsimple/README.md
@@ -0,0 +1,43 @@
+simple driver utilities
+=======================
+
+[simple] driver usage examples.
+
+[simple]: ../../km/src/simple
+
+Usage
+-----
+
+### exchange_ints.exe
+
+```
+Usage: exchange_ints.exe N
+```
+
+Parses its argument as an `unsigned int` and exchanges it with the one stored
+in [simple] driver's memory.
+For example:
+
+```
+> exchange_ints.exe 1
+42
+```
+
+```
+> exchange_ints.exe 32
+1
+```
+
+```
+> exchange_ints.exe 100500
+32
+```
+
+See also
+--------
+
+* [Building the utilities]
+* [License]
+
+[Building the utilities]: ../README.md#building-the-utilities
+[License]: ../../README.md#license
diff --git a/um/libsimple/include/libsimple/all.hpp b/um/libsimple/include/libsimple/all.hpp
new file mode 100644
index 0000000..474b802
--- /dev/null
+++ b/um/libsimple/include/libsimple/all.hpp
@@ -0,0 +1,8 @@
+// Copyright (c) 2015 Egor Tensin <Egor.Tensin@gmail.com>
+// This file is part of the "Windows 7 drivers" project.
+// For details, see https://github.com/egor-tensin/windows7-drivers.
+// Distributed under the MIT License.
+
+#pragma once
+
+#include "device.hpp"
diff --git a/um/libsimple/include/libsimple/device.hpp b/um/libsimple/include/libsimple/device.hpp
new file mode 100644
index 0000000..3318818
--- /dev/null
+++ b/um/libsimple/include/libsimple/device.hpp
@@ -0,0 +1,19 @@
+// Copyright (c) 2015 Egor Tensin <Egor.Tensin@gmail.com>
+// This file is part of the "Windows 7 drivers" project.
+// For details, see https://github.com/egor-tensin/windows7-drivers.
+// Distributed under the MIT License.
+
+#pragma once
+
+#include "libservice/all.hpp"
+
+namespace libsimple
+{
+    class Device : libservice::Device
+    {
+    public:
+        Device();
+
+        unsigned int exchange_ints(unsigned int) const;
+    };
+}
diff --git a/um/libsimple/src/device.cpp b/um/libsimple/src/device.cpp
new file mode 100644
index 0000000..57e6963
--- /dev/null
+++ b/um/libsimple/src/device.cpp
@@ -0,0 +1,37 @@
+// Copyright (c) 2015 Egor Tensin <Egor.Tensin@gmail.com>
+// This file is part of the "Windows 7 drivers" project.
+// For details, see https://github.com/egor-tensin/windows7-drivers.
+// Distributed under the MIT License.
+
+#include "libsimple/all.hpp"
+
+#include "libservice/all.hpp"
+
+#include <Windows.h>
+
+namespace libsimple
+{
+    namespace
+    {
+        const char* const device_path = "\\\\.\\simple_device1";
+        const auto exchange_ints_ctl_code = CTL_CODE(0x8001, 0x800, METHOD_BUFFERED, FILE_ANY_ACCESS);
+    }
+
+    Device::Device()
+        : libservice::Device(libservice::Device::open(device_path))
+    { }
+
+    unsigned int Device::exchange_ints(unsigned int src) const
+    {
+        unsigned int dest;
+
+        send_control_code(
+            exchange_ints_ctl_code,
+            &src,
+            sizeof(src),
+            &dest,
+            sizeof(dest));
+
+        return dest;
+    }
+}
diff --git a/um/libsimple/utils/CMakeLists.txt b/um/libsimple/utils/CMakeLists.txt
new file mode 100644
index 0000000..8824e3e
--- /dev/null
+++ b/um/libsimple/utils/CMakeLists.txt
@@ -0,0 +1,2 @@
+add_executable(exchange_ints exchange_ints.cpp)
+target_link_libraries(exchange_ints libsimple)
diff --git a/um/libsimple/utils/exchange_ints.cpp b/um/libsimple/utils/exchange_ints.cpp
new file mode 100644
index 0000000..2935b2f
--- /dev/null
+++ b/um/libsimple/utils/exchange_ints.cpp
@@ -0,0 +1,44 @@
+// Copyright (c) 2015 Egor Tensin <Egor.Tensin@gmail.com>
+// This file is part of the "Windows 7 drivers" project.
+// For details, see https://github.com/egor-tensin/windows7-drivers.
+// Distributed under the MIT License.
+
+#include "libsimple/all.hpp"
+
+#include <exception>
+#include <iostream>
+#include <sstream>
+#include <string>
+
+namespace
+{
+    bool parse_int(unsigned int& dest, const std::string& src)
+    {
+        std::istringstream iss(src);
+        char c;
+        return iss >> dest && !iss.get(c);
+    }
+}
+
+int main(int argc, char* argv[])
+{
+    try
+    {
+        unsigned int src;
+
+        if (argc != 2 || !parse_int(src, argv[1]))
+        {
+            std::cout << "Usage: " << argv[0] << " N\n";
+            return 1;
+        }
+
+        std::cout << libsimple::Device().exchange_ints(src) << "\n";
+    }
+    catch (const std::exception& e)
+    {
+        std::cerr << e.what() << "\n";
+        return 1;
+    }
+
+    return 0;
+}