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This is the changelog for ReactOS™ version 0.2.7 (released August 22, 2005), an open-source operating system designed to be binary executable- and device driver-compatible with Microsoft™ Windows NT™ and subsequent Microsoft operating systems such as Windows 2000™ and Windows XP™. ReactOS is written by the ReactOS development team, and the last previous version of ReactOS was version 0.2.6 (released April 10, 2005).


With the release of 0.2.7, ReactOS has again gained further compatibility with Microsoft™ Windows™. The headers for ReactOS have been aligned with those of the Windows Software Development Kit (SDK), which gives us a greater range of driver compatibility. ReactOS has also been updated to be compliant with the latest GNU™ C Compiler (GCC)—i.e., GCC version 4—which, with our new build system provides a faster and more efficient build process. We have elected a new user interface (UI) coordinator, and work has begun to modify the interfaces seen by the user.

Apart from the UI work, many of these improvements are of an "under-the-hood" nature and, while quite important to the rapid progress of the project, are not necessarily obvious to the end user. However, these refinements to the ReactOS infrastructure facilitate the ongoing advancements in USB, Plug and Play, and networking functionality that will be prominent features of the next upcoming release.

Main 0.2.7 Changes

  • Header clean-up for compatibility with Windows SDK headers; implemented and used NDK; ReactOS is now built with our own headers (Alex Ionescu, Filip Navara, and Steven Edwards)
  • New My Computer, command prompt, and ReactOS logo icons (Mindflyer)
  • New build system called rbuild which is based on the eXtensible Markup Language (XML), and which allows for automatically generated makefiles (Casper Hornstup)
  • Improved appearance of the first-stage installer (Alex Ionescu)
  • GCC 4.x.x build fixes (Thomas Weidenmueller and Alex Ionescu)

Known Bugs

  • ReactOS fails to boot on some hardware and reports an AllocConsole error when no PS/2-style mouse is attached (see Bug 688)
  • This ReactOS release requires 64 MB of RAM to complete the first-stage installer (see Bug 703)


ReactOS Core

Kernel and Executive (NTOSKRNL)

(Hervé Poussineau)

  • Implemented:
    • IoRegisterDeviceInterface
    • IoSetDeviceInterfaceState
    • IoRegisterPlugPlayNotification
    • IoUnregisterPlugPlayNotification
    • PoRequestPowerIrp
    • IRP_MN_QUERY_RESOURCE_REQUIREMENTS for devices enumerated by Root bus

(Eric Kohl)

  • Implemented:
    • PlugPlayControlProperty and PlugPlayControlGetDeviceDepth
    • CM_Get_Global_State/CM_Get_Global_State_Ex

(Alex Ionescu)

  • Kernel (Ke)
    • Implemented Guarded Mutex:
      • KeAcquireGuardedMutex, KeEnterGuardedRegion, KeLeaveGuardedRegion, KeInitializeGuardedMutex, KeAcquireGuardedMutexUnsafe, KeReleaseGuardedMutexUnsafe, KeAcquireGuardedMutex, KeReleaseGuardedMutex, KeTryToAcquireGuardedMutex
    • Fixed critical APC queuing and delivery bugs
    • Optimized Entering/Leaving critical sections and enabled APC delivery after each leave, if required
    • Fixed KeWaitForMultipleObjects if WaitAll was used
    • Rewrote context switching to be faster
    • Fixed KINTERRUPT structure and KeDisconnectInterrupt
    • Fixed a bug in which kernel queues were inserted into the ready thread list
  • Input/Output (Io)
    • Implemented IoIsfileOriginRemote, IoGetLowerDeviceObject, IoGetDiskDeviceObject, IoGetRequestorSessionId, IoGetRequestorProcessId, IoRegisterBootDriverRetinialization, IoAttachDevicetoDeviceStackSafe, IoEnumerateDeviceObjectList, IoGetDeviceAttachmentBaseRef, IoDetachDevice, IoRaiseHardError
    • Fixed controller objects implementation
    • Fixed attaching to devices (IoAttachDevice) so that the appropriate driver will be notified with IO_ATTACH_DEVICE_API
    • Fixed IoAttachDevicetoDeviceStack and IoAttachDevice to call the Safe function
    • Optimized IoGetRelatedDeviceObject
    • Removed IoOpenDeviceInstanceKey and IoQueryDeviceEnumInfo
    • Cleaned up IopAllocateVpb
    • Optimized IoCreateDevice, added support for more flags and removed hard-coded sector size and incorrect sizes which were previously set
    • Fixed IRP Code not to zero out the IRP, to free MDLs in failure cases, to set the correct IRP flags and to set the I/O object type
    • Reimplemented second-stage completion for IRPs to free ALL MDLs, to free memory depending on the flags used, not to call I/O Completion if an APC is registered, not to set event/call APCs in some failure cases, and not to use certain fields after the pointer can become invalid
    • Uses the correct stack count in I/O operations
    • Fixed IopDeleteFile to fix a memory leak and to dereference the completion port
    • Fixed IopCloseFile, NtQueryInformationFile, NtFlushBuffersFile, NtQueryDirectoryFile, NtReadFile, NtWriteFile, NtSetInformationFile, IopSecurityFile, IopQueryFileName, NtDeviceIoControlFile, NtLockFile, and NtUnlockFile, which contained several bugs related to IRPs and completion, were making assumptions or not supporting all the appropriate possibilities, were signaling the wrong event or making the wrong kind of call, or were using the wrong device object
    • Implemented lookaside lists for IRP packets to increase the allocation/deallocation speed by over 400%
    • Optimized completion packets by piggybacking them on IRP packets if possible, and added the correct memory flags to free them properly
    • Share NtDeviceIoControlFile and NtFsIoControlFile
    • Fixed IRP cancellation
    • Rewrote I/O interrupt functions to match the new structure, and optimized some code paths
  • Process Manager (Ps)
    • Created memory manager (Mm) functions when touching process/memory
    • Created kernel (Ke) functions when touching kernel structures and semantics
    • Cached and optimized system DLL (ntdll) loading/mapping, so that it is done only at startup
    • Implemented NtOpenProcess, PsRemoveLoadImageNotifyRoutine, PsGetCurrentProcessSessionId, PsSetLegoNotifyRoutine, PsRemoveCreateThreadNotifyroutine, PsGetVersion
    • Rewrote process/thread creation and exit functions
  • Memory Manager (Mm)
    • PEB and TEB are now properly allocated in memory, allowing 4KB granularity instead of 64KB, and removed all the hacks which allowed this earlier
    • Implemented MmCreateKernelStack and MmDeleteKernelStack
    • Took out many system structures from non-paged pool to paged pool, to reduce physical memory consumption
    • Removed pool debugging functions in retail builds to increase execution speed
    • Prohibit NtQueryVirtualMemory for kernel-mode addresses
    • Fixed bug in memory mapping which caused large applications to trigger the “blue screen of death” (BSOD)
    • Made the PE loader more lenient so that it can load a broader range of valid executables
  • Executive (Ex)
    • Fixed the lookaside functions, their macros and the way the functions were being exported
    • Moved Win32k object registration into Win32k—the pointers and initialization are now done when Win32k loads
  • Debugging Services (Dbgk/Kd)
    • Implemented some Dbgk code for user-mode debugging
    • Implemented modular debugging services for Bochs, GNU Debugger (GDB), etc.
  • Object Manager (Ob)
    • Implemented fast referencing stubs
    • Rewrote ObQueryNameString
    • Rewrote ObjectType creation to match the structures, flags and semantics present in Windows NT's Object Manager, from the caller's point of view
    • Implemented Object Create Information structure and semantics when capturing data from user-mode, securing and removing a lot of potential kernel exploits
    • Fixed ObCreateObject and ObInsertObject to work as in Microsoft Windows— ObCreateObject only allocates the object, while ObInsertObject does everything else
  • File System Runtime (FsRtl)
    • FsRtlMdlRead, FsRtlMdlReadComplete, FsMdlReadCompleteDev, FsRtlMdlWRiteComplete, FsRtlMdlWriteCompleteDev, FsRtlPrepareMdlWrite, CcMdlReadCompleted, CcMdlWriteComplete, CcMdlReadCompleteDev, FsRtlAllocateResource, FsRtlIsPagingFile, FsRtlBalanceReads
  • Security Subsystem (Se)
    • Implemented SeCreateAccessState, SeDeleteAccessState, and SeSetAccessStateGenericMapping based on a patch by Javier M. Mellid

(Thomas Weidenmueller)

  • Implemented RtlHashUnicodeString
  • Moved ntdll's atom table implementation to Rtl, and rewrote it to use proper structures and to share the generic implementation between ntoskrnl and ntdll
  • Updated the Rtl handle table implementation to use proper structures; however, reserved handles are not yet supported correctly

Kernel Mode Drivers

Input Device

  • i8042prt driver by [tinus]




(Hervé Poussineau)

  • serial.sys driver completed except control and flow (XON/XOFF)
  • serenum.sys driver completed—now enumerates mice plugged into serial ports


  • UHCI HCD driver supports recognizing Memory type of resource (Aleksey Bragin, Hervé Poussineau)
  • UHCI controller driver, which uses the Cromwell USB stack
  • Basic USB hub driver, which sometimes reports connected devices




  • Implemented WSAStringToAddressA and WSAStringToAddressW in ws2_32 (Magnus Olsen)
  • Added DHCP service and make it start (Art Yerkes,

(Andrew Munger)

  • Implement get* integer reading
  • Properly implemented ipv4addrs (validates a set of IPv4 addresses)
  • Limit the number of returned DNS servers to 1 until iphlpapi is fixed

Session Manager (SMSS)

  • Removed loading of the kernel-mode part of the Win32 subsystem (win32k.sys)
  • Removed running of winlogon.exe

Win32™ Personality

User mode subsystem server (CSRSS)

  • Added loading of the kernel-mode part of the Win32 subsystem (win32k.sys);
  • Run winlogon.exe
  • Implemented EnumSystemLocalesW (Aleksey Bragin)

Kernel-mode subsystem server (Win32K)

(Magnus Olsen)

  • Implemented NtGdiDdCanCreateSurface and NtGdiDdBlt for DirectX™ (untested)
  • Expanded StretchBitBlt to all bit-per-pixel (BPP) settings (not yet fully implemented; use the code as a reference)
  • partially implemented fullscreen in changedisplay setting—I can play winquake™ in fullscreen now :)
  • Implemented NtGdiGetSystemPaletteUse and NtGdiSetSystemPaletteUse (this code has been taken from Wine)
  • Fixed winquake color glitch bug—the text is now white instead of black (Magnus Olsen)
  • Implemented NtGdiAnimatePalette (partly ripped from Wine; does not animate 100% of the palette) (Hervé Poussineau)
  • Speed-optimized the bitblt (Magnus Olsen, Gregor Anich), Alex Ionescu), Gé van Geldorp) (see svn log)
  • Repaired GDI to handle debugging functionality (Filip Navara)
  • Implemented NtGdiUnrealizedObject (James Tabor)
  • Implemented WH_KEYBOARD_LL hook (Gé van Geldorp)

Win32™ Libraries


(Eric Kohl)

  • Implemented LockServiceDatabase, UnlockServiceDatabase, ControlService, QueryServiceStatus
  • Implemented OpenSCManagerA, OpenServiceA, OpenServiceW and QueryServiceStatus

(Thomas Weidenmueller)

  • Ported BuildTrusteeWithObjectsAndName and BuildTrusteeWithObjectsAndSid from Wine
  • Implemented RegOpenCurrentUser
  • Implemented OpenAndMapFileForRead, RetrieveFileSecurity, StampFileSecurity, TakeOwnershipOfFile and UnmapAndCloseFile
  • Implemented RegOpenUserClassesRoot
  • Implemented IsTokenRestricted(), inspired by a patch to Wine by James Hawkins
  • Implemented TokenRestrictedSids


  • Implemented GetCommProperties, ClearCommError, CommConfigDialogA, CommConfigDialogW (Saveliy Tretiakov)
  • Implemented GetCommConfig, SetCommConfig, FindFirstFileExW (Dmitry Philippov)


  • Work by Hervé Poussineau on devices enumeration by implementing:
    • CM_Enumerate_Classes(_Ex)
    • SetupDiCreateDeviceInfoA
    • SetupDiCreateDeviceInfoListExW
    • SetupDiEnumDeviceInfo
    • SetupDiGetActualSectionToInstallA
    • SetupDiGetClassDescriptionExA
    • SetupDiGetClassDevs(Ex)A/W
    • SetupDiGetDeviceInterfaceDetailA/W
    • SetupDiGetDeviceRegistryPropertyA/W

(Eric Kohl) implemented:

    • ConcatenatePaths
    • MyGetFileTitle
    • GetVersionInfoFromImage
    • StringTableDuplicate


  • Reverted last previous sync with Wine and userhook—before we can sync with Wine, we need to rewrite the enumeration and registration of devices so that they work correctly in both ReactOS and Windows
  • Added SVN rev. 15043 and userhooks only for the mouse—the mouse now works in tribles in windowed mode, but in full screen it is a bit choppy; however, this has not been tested in tribles on ReactOS with the new code


Libraries shared with Wine

(Gé van Geldorp)

  • Synced to Wine-20050419
  • Synced to Wine-20040419
  • Synced to Wine-20050524
  • Synced to Wine-20050628


  • Implemented DragDetect based on Wine code &copyright; 1993, 1994 Alexandre Julliard (Filip Navara)

(James Tabor) implemented:

    • TrackMouseEvent
    • NtUserGetAsyncKeyState and support for TrackMouseEvent
    • DrawMenuBar
    • CheckMenuRadioItem (not fully tested)
    • GetMenuString A and W (not fully tested)
    • ModifyMenu A and W
    • MDICascade, MDITile and WIN_ListChildren

Win32™ Applications


(Tim Jobling)

  • Relicensed to GNU Public License (GPL)
  • Changed C++ style commenting to C style
  • IPConfig now has the following functionality:
    • Displays NodeType with meaningful, human-readable names
    • Exclusively uses TCHAR strings
    • Displays physical address, DHCP enabled state, IP addresses and netmasks, default gateway, DHCP server and DHCP lease times
    • Parses command line options
    • Defaults to showing only the IP/SM/DG if no options are specified
    • Handles options /All and /?
    • Displays message about all unimplemented options


(Magnus Olsen)

  • Removed all hard-coded strings to their own .rc file
  • Caches codepage instead of always calling on win32 api for it
  • Added *.* syntax to dir command
  • Bugfix: Color now it work as it should
  • Bugfix: CD "Program Files" now works
  • Implemented CD s*
  • Translates %errorlevel% to a value when passed at command line—now errorlevel is implemented as it should be
    • left to do: check that all CMD commands are set to the correct value
  • Fixed a small bug in choice.c so that it prints out choice sadsad correctly
  • Added %time% and %cd% internal values (example: echo %cd% or echo %time%)
  • Added %DATE% (example: echo %date% works now)
  • Bugfix: date now prints out the names of the days of the week
  • Added %RANDOM% (for an example of how to use it: echo %random%)
  • Added %cmdcmdline% (for an example of how to use it: echo %CMDCMDLINE%)
  • Added %CMDEXTVERSION% (for an example of how to use it: echo %CMDEXTVERSION%—the value is hardcoded to 2, because that is the value Microsoft Windows 2000 and Windows XP report) (thanks to arty for testing this in Windows XP)
  • Added quick dirty hack getting our implementation working with 1>null by me (thanks to Hartex and Brandon for hunting down the bug)

(Klemens Friedl)

  • Added Help command
  • Added German language resource to the ReactOS Command Processor

(not completely finished, I will update it as soon as possible) ([3] Martin Rottensteiner)

  • Sets errorlevel to 9009 if command not found
  • Implemented exit /b # in batch files

(Brandon Turner)

  • Added exclusive deletion (for example: del * -abc.txt -text*.txt)
  • Fixed bug to allow Microsoft-style wildcards
  • Code clean up: added /y and /-y in move.c
  • simple check to fix > and | bugs with rem
  • Implemented /A in delete (for example: del /A:H /A:-R *.exe -ping.exe)
  • Bugfix: color.c now works similar to Microsoft CMD color
  • Bugfix: mv foo.txt c:\temp now gives you c:\tempfoo.txt


  • Removed some hard-coded strings tested by Hartex (Filip Navara)


  • Stepwise taskbar resizing (charn)
  • Swedish translation (David Nordenberg (dnordenberg /at/
  • Added option to build Explorer as ReactOS shell without integrated Explorer part (Martin Fuchs)
  • Display of custom folders in start menu root (Martin Fuchs)
  • Fixed listbox insertion algorithms (Martin Fuchs)
  • Czech translation of Explorer ([4]Luk Frolka)
  • Russian translation (done by Dmitry Philippov; checked by fireball, DarkHobbit and others)
  • French translation (Hervé Poussineau)
  • Split big Explorer resource file into smaller, language-specific resource scripts (Martin Fuchs)
  • Implemented part of screensaver functions: get values from reg, and show screensaver (sikker2004)


Versions / Official Changelogs / Community Changelogs
0.0.x Series 0.0.8 | 0.0.9 | 0.0.10 | 0.0.11 | 0.0.12 | 0.0.13 | 0.0.14 | 0.0.15 | 0.0.16 | 0.0.17 | 0.0.18 | 0.0.19 | 0.0.20 | 0.0.21
0.1.x Series 0.1.0 | 0.1.1 | 0.1.2 | 0.1.3 | 0.1.4 | 0.1.5
0.2.x Series 0.2.0 | 0.2.1 | 0.2.2 | 0.2.3 | 0.2.4 | 0.2.5 | 0.2.6 | 0.2.7 | 0.2.8 | 0.2.9
0.3.x Series 0.3.0 | 0.3.1 | 0.3.2 | 0.3.3 | 0.3.4 | 0.3.5 | 0.3.6 | 0.3.7 | 0.3.8 | 0.3.9 | 0.3.10 | 0.3.11 | 0.3.12 | 0.3.13 | 0.3.14 | 0.3.15 | 0.3.16 | 0.3.17
0.4.x Series 0.4.0 | 0.4.1 | 0.4.2 | 0.4.3 | 0.4.4 | 0.4.5 | 0.4.6 | 0.4.7 | 0.4.8 | 0.4.9 | 0.4.10 | 0.4.11 | 0.4.12 | 0.4.13 | 0.4.14