The Windows TEB data structure.

TEB.c

struct _TEB {
  struct _NT_TIB NtTib;
  void *EnvironmentPointer;
  struct _CLIENT_ID ClientId;
  void *ActiveRpcHandle;
  void *ThreadLocalStoragePointer;
  struct _PEB *ProcessEnvironmentBlock;
  unsigned long LastErrorValue;
  unsigned long CountOfOwnedCriticalSections;
  void *CsrClientThread;
  void *Win32ThreadInfo;
  unsigned long User32Reserved[26];
  unsigned long UserReserved[5];
  void *WOW32Reserved;
  unsigned long CurrentLocale;
  unsigned long FpSoftwareStatusRegister;
  void *ReservedForDebuggerInstrumentation[16];
  void *SystemReserved1[37];
  unsigned int WorkingOnBehalfTicket[8];
  long ExceptionCode;
  unsigned int Padding0[4];
  struct _ACTIVATION_CONTEXT_STACK *ActivationContextStackPointer;
  unsigned int InstrumentationCallbackSp;
  unsigned int InstrumentationCallbackPreviousPc;
  unsigned int InstrumentationCallbackPreviousSp;
  unsigned long TxFsContext;
  unsigned int InstrumentationCallbackDisabled;
  unsigned int Padding1[3];
  struct _GDI_TEB_BATCH GdiTebBatch;
  struct _CLIENT_ID RealClientId;
  void *GdiCachedProcessHandle;
  unsigned long GdiClientPID;
  unsigned long GdiClientTID;
  void *GdiThreadLocalInfo;
  unsigned int Win32ClientInfo[62];
  void *glDispatchTable[233];
  unsigned int glReserved1[29];
  void *glReserved2;
  void *glSectionInfo;
  void *glSection;
  void *glTable;
  void *glCurrentRC;
  void *glContext;
  unsigned long LastStatusValue;
  unsigned int Padding2[4];
  struct _UNICODE_STRING StaticUnicodeString;
  wchar_t StaticUnicodeBuffer[261];
  unsigned int Padding3[6];
  void *DeallocationStack;
  void *TlsSlots[64];
  struct _LIST_ENTRY TlsLinks;
  void *Vdm;
  void *ReservedForNtRpc;
  void *DbgSsReserved[2];
  unsigned long HardErrorMode;
  unsigned int Padding4[4];
  void *Instrumentation[11];
  struct _GUID ActivityId;
  void *SubProcessTag;
  void *PerflibData;
  void *EtwTraceData;
  void *WinSockData;
  unsigned long GdiBatchCount;
  struct _PROCESSOR_NUMBER CurrentIdealProcessor;
  unsigned long IdealProcessorValue;
  unsigned int ReservedPad0;
  unsigned int ReservedPad1;
  unsigned int ReservedPad2;
  unsigned int IdealProcessor;
  unsigned long GuaranteedStackBytes;
  unsigned int Padding5[4];
  void *ReservedForPerf;
  void *ReservedForOle;
  unsigned long WaitingOnLoaderLock;
  unsigned int Padding6[4];
  void *SavedPriorityState;
  unsigned int ReservedForCodeCoverage;
  void *ThreadPoolData;
  void **TlsExpansionSlots;
  void *DeallocationBStore;
  void *BStoreLimit;
  unsigned long MuiGeneration;
  unsigned long IsImpersonating;
  void *NlsCache;
  void *pShimData;
  unsigned int HeapVirtualAffinity;
  unsigned int LowFragHeapDataSlot;
  unsigned int Padding7[4];
  void *CurrentTransactionHandle;
  struct _TEB_ACTIVE_FRAME *ActiveFrame;
  void *FlsData;
  void *PreferredLanguages;
  void *UserPrefLanguages;
  void *MergedPrefLanguages;
  unsigned long MuiImpersonation;
  unsigned int CrossTebFlags;
  unsigned int SpareCrossTebBits : 16;
  unsigned int SameTebFlags;
  unsigned int SafeThunkCall : 1;
  unsigned int InDebugPrint : 1;
  unsigned int HasFiberData : 1;
  unsigned int SkipThreadAttach : 1;
  unsigned int WerInShipAssertCode : 1;
  unsigned int RanProcessInit : 1;
  unsigned int ClonedThread : 1;
  unsigned int SuppressDebugMsg : 1;
  unsigned int DisableUserStackWalk : 1;
  unsigned int RtlExceptionAttached : 1;
  unsigned int InitialThread : 1;
  unsigned int SessionAware : 1;
  unsigned int LoadOwner : 1;
  unsigned int LoaderWorker : 1;
  unsigned int SpareSameTebBits : 2;
  void *TxnScopeEnterCallback;
  void *TxnScopeExitCallback;
  void *TxnScopeContext;
  unsigned long LockCount;
  long WowTebOffset;
  void *ResourceRetValue;
  void *ReservedForWdf;
  unsigned int ReservedForCrt;
  struct _GUID EffectiveContainerId;
};