823 lines
19 KiB
C
823 lines
19 KiB
C
/*++ BUILD Version: 0000 // Increment this if a change has global effects
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Copyright (c) 1989 Microsoft Corporation
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Module Name:
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LfsProcs.h
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Abstract:
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This module defines all of the globally used procedures in the Log
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File Service.
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Author:
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Brian Andrew [BrianAn] 20-June-1991
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Revision History:
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--*/
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#ifndef _LFSPROCS_
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#define _LFSPROCS_
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#include <ntifs.h>
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#include <string.h>
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#include <lfs.h>
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#include "nodetype.h"
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#include "LfsDisk.h"
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#include "LfsStruc.h"
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#include "LfsData.h"
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//
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// Tag all of our allocations if tagging is turned on
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//
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#undef FsRtlAllocatePool
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#undef FsRtlAllocatePoolWithQuota
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#define FsRtlAllocatePool(a,b) FsRtlAllocatePoolWithTag(a,b,' sfL')
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#define FsRtlAllocatePoolWithQuota(a,b) FsRtlAllocatePoolWithQuotaTag(a,b,' sfL')
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#define LfsAllocatePoolNoRaise(a,b) ExAllocatePoolWithTag((a),(b),MODULE_POOL_TAG)
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#define LfsAllocatePool(a,b) ExAllocatePoolWithTag(((a) | POOL_RAISE_IF_ALLOCATION_FAILURE),(b),MODULE_POOL_TAG)
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#define LfsFreePool(pv) ExFreePool(pv)
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#ifndef INLINE
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// definition of inline
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#define INLINE __inline
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#endif
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//
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// The following routines provide an interface with the cache package.
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// They are contained in 'CacheSup.c'.
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//
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NTSTATUS
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LfsPinOrMapData (
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IN PLFCB Lfcb,
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IN LONGLONG FileOffset,
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IN ULONG Length,
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IN BOOLEAN PinData,
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IN BOOLEAN AllowErrors,
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IN BOOLEAN IgnoreUsaErrors,
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OUT PBOOLEAN UsaError,
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OUT PVOID *Buffer,
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OUT PBCB *Bcb
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);
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//
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// VOID
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// LfsPreparePinWriteData (
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// IN PLFCB Lfcb,
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// IN LONGLONG FileOffset,
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// IN ULONG Length,
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// IN LOGICAL ReadFromDisk,
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// OUT PVOID *Buffer,
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// OUT PBCB *Bcb
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// );
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//
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#ifdef LFS_CLUSTER_CHECK
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#define LfsPreparePinWriteData(L,FO,LEN,R,BUF,B) { \
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LONGLONG _LocalFileOffset = (FO); \
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CcPinRead( (L)->FileObject, \
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(PLARGE_INTEGER)&_LocalFileOffset, \
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(LEN), \
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TRUE, \
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(B), \
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(BUF) ); \
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}
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#else
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#define LfsPreparePinWriteData(L,FO,LEN,R,BUF,B) { \
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LONGLONG _LocalFileOffset = (FO); \
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if (R) { \
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CcPinRead( (L)->FileObject, \
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(PLARGE_INTEGER)&_LocalFileOffset, \
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(LEN), \
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TRUE, \
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(B), \
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(BUF) ); \
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} else { \
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CcPreparePinWrite( (L)->FileObject, \
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(PLARGE_INTEGER)&_LocalFileOffset, \
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(LEN), \
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FALSE, \
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TRUE, \
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(B), \
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(BUF) ); \
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} \
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}
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#endif
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VOID
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LfsPinOrMapLogRecordHeader (
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IN PLFCB Lfcb,
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IN LSN Lsn,
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IN BOOLEAN PinData,
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IN BOOLEAN IgnoreUsaErrors,
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OUT PBOOLEAN UsaError,
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OUT PLFS_RECORD_HEADER *RecordHeader,
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OUT PBCB *Bcb
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);
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VOID
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LfsCopyReadLogRecord (
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IN PLFCB Lfcb,
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IN PLFS_RECORD_HEADER RecordHeader,
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OUT PVOID Buffer
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);
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VOID
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LfsFlushLfcb (
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IN PLFCB Lfcb,
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IN PLBCB Lbcb
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);
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BOOLEAN
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LfsReadRestart (
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IN PLFCB Lfcb,
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IN LONGLONG FileSize,
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IN BOOLEAN FirstRestart,
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OUT PLONGLONG RestartPageOffset,
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OUT PLFS_RESTART_PAGE_HEADER *RestartPage,
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OUT PBCB *RestartPageBcb,
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OUT PBOOLEAN ChkdskWasRun,
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OUT PBOOLEAN ValidPage,
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OUT PBOOLEAN UninitializedFile,
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OUT PBOOLEAN LogPacked,
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OUT PLSN LastLsn
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);
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//
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// The following routines manipulate buffer control blocks. They are
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// contained in 'LbcbSup.c'
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//
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VOID
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LfsFlushLbcb (
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IN PLFCB Lfcb,
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IN PLBCB Lbcb
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);
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VOID
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LfsFlushToLsnPriv (
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IN PLFCB Lfcb,
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IN LSN Lsn
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);
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PLBCB
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LfsGetLbcb (
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IN PLFCB Lfcb
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);
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//
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// The following routines are in LfsData.c
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//
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LONG
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LfsExceptionFilter (
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IN PEXCEPTION_POINTERS ExceptionPointer
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);
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//
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// Log page support routines. The following routines manipulate and
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// modify log pages. They are contained in 'LogPgSup.c'
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//
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//
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// VOID
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// LfsTruncateOffsetToLogPage (
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// IN PLFCB Lfcb,
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// IN LONGLONG LargeInt,
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// OUT PLONGLONG Result
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// );
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//
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// ULONG
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// LfsLogPageOffset (
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// IN PLFCB Lfcb,
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// IN ULONG Integer
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// );
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//
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#define LfsTruncateOffsetToLogPage(LFCB,LI,OUTLI) \
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*(OUTLI) = LI; \
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*((PULONG)(OUTLI)) &= (LFCB)->LogPageInverseMask
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#define LfsLogPageOffset(LFCB,INT) \
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(INT & (LFCB)->LogPageMask)
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VOID
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LfsNextLogPageOffset (
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IN PLFCB Lfcb,
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IN LONGLONG CurrentLogPageOffset,
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OUT PLONGLONG NextLogPageOffset,
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OUT PBOOLEAN Wrapped
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);
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PVOID
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LfsAllocateSpanningBuffer (
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IN PLFCB Lfcb,
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IN ULONG Length
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);
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VOID
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LfsFreeSpanningBuffer (
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IN PVOID Buffer
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);
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//
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// The following routines provide support for dealing with log records. They
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// are contained in 'LogRcSup.c'
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//
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BOOLEAN
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LfsWriteLogRecordIntoLogPage (
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IN PLFCB Lfcb,
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IN PLCH Lch,
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IN ULONG NumberOfWriteEntries,
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IN PLFS_WRITE_ENTRY WriteEntries,
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IN LFS_RECORD_TYPE RecordType,
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IN TRANSACTION_ID *TransactionId OPTIONAL,
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IN LSN ClientUndoNextLsn OPTIONAL,
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IN LSN ClientPreviousLsn OPTIONAL,
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IN LONG UndoRequirement,
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IN BOOLEAN ForceToDisk,
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OUT PLSN Lsn
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);
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//
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// Lsn support routines. The following routines provide support for
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// manipulating Lsn values. They are contained in 'LsnSup.c'
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//
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//
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// LSN
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// LfsFileOffsetToLsn (
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// IN PLFCB Lfcb,
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// IN LONGLONG FileOffset,
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// IN LONGLONG SequenceNumber
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// );
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//
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// BOOLEAN
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// LfsIsLsnInFile (
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// IN PLFCB Lfcb,
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// IN LSN Lsn
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// );
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//
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// LSN
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// LfsComputeLsnFromLbcb (
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// IN PLFCB Lfcb,
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// IN PLBCB Lbcb
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// );
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//
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// VOID
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// LfsTruncateLsnToLogPage (
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// IN PLFCB Lfcb,
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// IN LSN Lsn,
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// OUT PLONGLONG FileOffset
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// );
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//
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// LONGLONG
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// LfsLsnToFileOffset (
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// IN PLFCB Lfcb,
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// IN LSN Lsn
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// );
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//
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// LONGLONG
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// LfsLsnToSeqNumber (
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// IN PLFCB Lfcb,
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// IN LSN Lsn
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// );
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//
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// ULONG
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// LfsLsnToPageOffset (
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// IN PLFCB Lfcb,
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// IN LSN Lsn
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// );
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//
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#define LfsFileOffsetToLsn(LFCB,FO,SN) ( \
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(((ULONGLONG)(FO)) >> 3) + Int64ShllMod32((SN), (LFCB)->FileDataBits) \
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)
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#define LfsIsLsnInFile(LFCB,LSN) \
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(/*xxGeq*/( (LSN).QuadPart >= ((LFCB)->OldestLsn).QuadPart ) \
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&& /*xxLeq*/( (LSN).QuadPart <= ((LFCB)->RestartArea->CurrentLsn).QuadPart ))
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#define LfsComputeLsnFromLbcb(LFCB,LBCB) ( \
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LfsFileOffsetToLsn( LFCB, \
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(LBCB)->FileOffset + (LBCB)->BufferOffset, \
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(LBCB)->SeqNumber ) \
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)
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#define LfsTruncateLsnToLogPage(LFCB,LSN,FO) { \
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*(FO) = LfsLsnToFileOffset( LFCB, LSN ); \
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*((PULONG)(FO)) &= (LFCB)->LogPageInverseMask; \
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}
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#define LfsLsnToFileOffset(LFCB,LSN) \
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/*xxShr*/( ((ULONGLONG)/*xxShl*/( (LSN).QuadPart << (LFCB)->SeqNumberBits )) >> ((LFCB)->SeqNumberBits - 3) )
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#define LfsLsnToSeqNumber(LFCB,LSN) \
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/*xxShr*/Int64ShrlMod32( ((ULONGLONG)(LSN).QuadPart), (LFCB)->FileDataBits )
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#define LfsLsnToPageOffset(LFCB,LSN) \
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LfsLogPageOffset( LFCB, (LSN).LowPart << 3 )
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VOID
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LfsLsnFinalOffset (
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IN PLFCB Lfcb,
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IN LSN Lsn,
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||
IN ULONG DataLength,
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||
OUT PLONGLONG FinalOffset
|
||
);
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||
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BOOLEAN
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LfsFindNextLsn (
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IN PLFCB Lfcb,
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IN PLFS_RECORD_HEADER RecordHeader,
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OUT PLSN Lsn
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);
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//
|
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// The following routines support the Lfs restart areas. They are contained
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// in 'RstrtSup.c'
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//
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||
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VOID
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LfsWriteLfsRestart (
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IN PLFCB Lfcb,
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IN ULONG ThisRestartSize,
|
||
IN BOOLEAN WaitForIo
|
||
);
|
||
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VOID
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LfsFindOldestClientLsn (
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IN PLFS_RESTART_AREA RestartArea,
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IN PLFS_CLIENT_RECORD ClientArray,
|
||
OUT PLSN OldestLsn
|
||
);
|
||
|
||
|
||
//
|
||
// The following routines are used for managing the structures allocated
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||
// by us. They are contained in 'StrucSup.c'
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//
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PLFCB
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LfsAllocateLfcb (
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IN ULONG LogPageSize,
|
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IN LONGLONG FileSize
|
||
);
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||
|
||
|
||
VOID
|
||
LfsDeallocateLfcb (
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||
IN PLFCB Lfcb,
|
||
IN BOOLEAN CompleteTeardown
|
||
);
|
||
|
||
VOID
|
||
LfsAllocateLbcb (
|
||
IN PLFCB Lfcb,
|
||
OUT PLBCB *Lbcb
|
||
);
|
||
|
||
VOID
|
||
LfsDeallocateLbcb (
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||
IN PLFCB Lfcb,
|
||
IN PLBCB Lbcb
|
||
);
|
||
|
||
VOID
|
||
LfsAllocateLeb (
|
||
IN PLFCB Lfcb,
|
||
OUT PLEB *NewLeb
|
||
);
|
||
|
||
VOID
|
||
LfsDeallocateLeb (
|
||
IN PLFCB Lfcb,
|
||
IN PLEB Leb
|
||
);
|
||
|
||
VOID
|
||
LfsReadPage (
|
||
IN PLFCB Lfcb,
|
||
IN PLARGE_INTEGER Offset,
|
||
OUT PMDL *Mdl,
|
||
OUT PVOID *Buffer
|
||
);
|
||
|
||
//
|
||
// VOID
|
||
// LfsInitializeLeb (
|
||
// IN PLEB Leb,
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// IN LFS_CLIENT_ID ClientId,
|
||
// IN LFS_CONTEXT_MODE ContextMode
|
||
// );
|
||
//
|
||
//
|
||
// VOID
|
||
// LfsAllocateLch (
|
||
// OUT PLCH *Lch
|
||
// );
|
||
//
|
||
// VOID
|
||
// LfsDeallocateLch (
|
||
// IN PLCH Lch
|
||
// );
|
||
//
|
||
// VOID
|
||
// LfsAllocateRestartArea (
|
||
// OUT PLFS_RESTART_AREA *RestartArea,
|
||
// ULONG Size
|
||
// );
|
||
//
|
||
// VOID
|
||
// LfsDeallocateRestartArea (
|
||
// IN PLFS_RESTART_AREA RestartArea
|
||
// );
|
||
//
|
||
// BOOLEAN
|
||
// LfsLbcbIsRestart (
|
||
// IN PLBCB Lbcb
|
||
// );
|
||
//
|
||
|
||
#define LfsInitializeLeb(LEB,ID,MODE) \
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||
(LEB)->ClientId = ID; \
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||
(LEB)->ContextMode = MODE
|
||
|
||
|
||
#define LfsAllocateLch(NEW) { \
|
||
*(NEW) = FsRtlAllocatePool( PagedPool, sizeof( LCH )); \
|
||
RtlZeroMemory( (*NEW), sizeof( LCH )); \
|
||
(*(NEW))->NodeTypeCode = LFS_NTC_LCH; \
|
||
(*(NEW))->NodeByteSize = sizeof( LCH ); \
|
||
}
|
||
|
||
#define LfsDeallocateLch(LCH) \
|
||
ExFreePool( LCH )
|
||
|
||
#define LfsAllocateRestartArea(RS,SIZE) \
|
||
*(RS) = FsRtlAllocatePool( PagedPool, (SIZE) ); \
|
||
RtlZeroMemory( *(RS), (SIZE) )
|
||
|
||
#define LfsDeallocateRestartArea(RS) \
|
||
ExFreePool( RS )
|
||
|
||
#define LfsLbcbIsRestart(LBCB) \
|
||
(FlagOn( (LBCB)->LbcbFlags, LBCB_RESTART_LBCB ))
|
||
|
||
|
||
//
|
||
// The following routines provide synchronization support for the Lfs
|
||
// shared structures. They are contained in 'SyncSup.c'
|
||
//
|
||
|
||
//
|
||
// VOID
|
||
// LfsAcquireLfsData (
|
||
// );
|
||
//
|
||
// VOID
|
||
// LfsReleaseLfsData (
|
||
// );
|
||
//
|
||
// VOID
|
||
// LfsAcquireLfcb (
|
||
// IN PLFCB Lfcb
|
||
// );
|
||
//
|
||
// VOID
|
||
// LfsReleaseLfcb (
|
||
// IN PLFCB Lfcb
|
||
// );
|
||
//
|
||
// VOID
|
||
// LfsAcquireLch (
|
||
// IN PLCH Lch
|
||
// );
|
||
//
|
||
// VOID
|
||
// LfsReleaseLfcb (
|
||
// IN PLCH Lch
|
||
// );
|
||
//
|
||
|
||
#define LfsAcquireLfsData() \
|
||
ExAcquireFastMutex( &LfsData.LfsDataLock )
|
||
|
||
#define LfsReleaseLfsData() \
|
||
ExReleaseFastMutex( &LfsData.LfsDataLock )
|
||
|
||
#define LfsAcquireBufferLock() \
|
||
ExAcquireFastMutex( &LfsData.BufferLock )
|
||
|
||
#define LfsReleaseBufferLock() \
|
||
ExReleaseFastMutex( &LfsData.BufferLock )
|
||
|
||
#define LfsWaitForBufferNotification() \
|
||
KeWaitForSingleObject( &LfsData.BufferNotification, \
|
||
Executive, \
|
||
KernelMode, \
|
||
FALSE, \
|
||
NULL )
|
||
|
||
#define LfsNotifyBufferWaiters() \
|
||
KeSetEvent( &LfsData.BufferNotification, 0, FALSE )
|
||
|
||
#define LfsBlockBufferWaiters() \
|
||
KeClearEvent( &LfsData.BufferNotification )
|
||
|
||
INLINE
|
||
VOID
|
||
LfsAcquireLfcb (
|
||
IN PLFCB Lfcb
|
||
)
|
||
{
|
||
ExAcquireResourceExclusiveLite( &Lfcb->Sync->Resource, TRUE );
|
||
}
|
||
|
||
INLINE
|
||
VOID
|
||
LfsReleaseLfcb (
|
||
IN PLFCB Lfcb
|
||
)
|
||
{
|
||
if (Lfcb->Sync->Resource.OwnerThreads[0].OwnerThread == ExGetCurrentResourceThread()) {
|
||
ExReleaseResourceLite( &Lfcb->Sync->Resource );
|
||
}
|
||
}
|
||
|
||
INLINE
|
||
VOID
|
||
LfsAcquireLch (
|
||
IN PLCH Lch
|
||
)
|
||
{
|
||
ExAcquireResourceExclusiveLite( &(Lch->Sync->Resource), TRUE );
|
||
}
|
||
|
||
INLINE
|
||
VOID
|
||
LfsReleaseLch (
|
||
IN PLCH Lch
|
||
)
|
||
{
|
||
if (Lch->Sync->Resource.OwnerThreads[0].OwnerThread == ExGetCurrentResourceThread()) {
|
||
ExReleaseResourceLite( &Lch->Sync->Resource );
|
||
}
|
||
}
|
||
|
||
|
||
|
||
//
|
||
// The following routines are used to check various structures for validity
|
||
// and comparability. They are contained in 'VerfySup.c'.
|
||
//
|
||
|
||
VOID
|
||
LfsCurrentAvailSpace (
|
||
IN PLFCB Lfcb,
|
||
OUT PLONGLONG CurrentAvailSpace,
|
||
OUT PULONG CurrentPageBytes
|
||
);
|
||
|
||
BOOLEAN
|
||
LfsVerifyLogSpaceAvail (
|
||
IN PLFCB Lfcb,
|
||
IN PLCH Lch,
|
||
IN ULONG RemainingLogBytes,
|
||
IN LONG UndoRequirement,
|
||
IN BOOLEAN ForceToDisk
|
||
);
|
||
|
||
VOID
|
||
LfsFindCurrentAvail (
|
||
IN PLFCB Lfcb
|
||
);
|
||
|
||
BOOLEAN
|
||
LfsCheckSubsequentLogPage (
|
||
IN PLFCB Lfcb,
|
||
IN PLFS_RECORD_PAGE_HEADER RecordPageHeader,
|
||
IN LONGLONG LogFileOffset,
|
||
IN LONGLONG SequenceNumber
|
||
);
|
||
|
||
|
||
//
|
||
// VOID
|
||
// LfsValidateLch (
|
||
// IN PLCH Lch
|
||
// );
|
||
//
|
||
// VOID
|
||
// LfsValidateClientId (
|
||
// IN PLFCB Lfcb,
|
||
// IN PLCH Lch
|
||
// );
|
||
//
|
||
// BOOLEAN
|
||
// LfsVerifyClientLsnInRange (
|
||
// IN PLFCB Lfcb,
|
||
// IN PLFS_CLIENT_RECORD ClientRecord,
|
||
// IN LSN Lsn
|
||
// );
|
||
//
|
||
// BOOLEAN
|
||
// LfsClientIdMatch (
|
||
// IN PLFS_CLIENT_ID ClientA,
|
||
// IN PLFS_CLIENT_ID ClientB
|
||
// )
|
||
//
|
||
// VOID
|
||
// LfsValidateLeb (
|
||
// IN PLFS_CONTEXT_BLOCK Leb,
|
||
// IN PLCH Lch
|
||
// )
|
||
//
|
||
|
||
#define LfsValidateLch(LCH) \
|
||
if ((LCH) == NULL \
|
||
|| (LCH)->NodeTypeCode != LFS_NTC_LCH \
|
||
|| ((LCH)->Lfcb != NULL \
|
||
&& (LCH)->Lfcb->NodeTypeCode != LFS_NTC_LFCB)) { \
|
||
\
|
||
ExRaiseStatus( STATUS_ACCESS_DENIED ); \
|
||
}
|
||
|
||
#define LfsValidateClientId(LFCB,LCH) \
|
||
if ((LCH)->ClientId.ClientIndex >= (LFCB)->RestartArea->LogClients \
|
||
|| (LCH)->ClientId.SeqNumber \
|
||
!= Add2Ptr( Lfcb->ClientArray, \
|
||
(LCH)->ClientArrayByteOffset, \
|
||
PLFS_CLIENT_RECORD )->SeqNumber) { \
|
||
ExRaiseStatus( STATUS_ACCESS_DENIED ); \
|
||
}
|
||
|
||
#define LfsVerifyClientLsnInRange(LFCB,CLIENT,LSN) \
|
||
(/*xxGeq*/( (LSN).QuadPart >= ((CLIENT)->OldestLsn).QuadPart ) \
|
||
&& /*xxLeq*/( (LSN).QuadPart <= ((LFCB)->RestartArea->CurrentLsn).QuadPart ) \
|
||
&& /*xxNeqZero*/( (LSN).QuadPart != 0 ))
|
||
|
||
#define LfsClientIdMatch(CLIENT_A,CLIENT_B) \
|
||
((BOOLEAN) ((CLIENT_A)->SeqNumber == (CLIENT_B)->SeqNumber \
|
||
&& (CLIENT_A)->ClientIndex == (CLIENT_B)->ClientIndex))
|
||
|
||
#define LfsValidateLeb(LEB,LCH) \
|
||
if (LEB == NULL \
|
||
|| (LEB)->NodeTypeCode != LFS_NTC_LEB \
|
||
|| !LfsClientIdMatch( &(LEB)->ClientId, &(LCH)->ClientId )) { \
|
||
ExRaiseStatus( STATUS_ACCESS_DENIED ); \
|
||
}
|
||
|
||
|
||
//
|
||
// Miscellaneous support routines
|
||
//
|
||
|
||
//
|
||
// ULONG
|
||
// FlagOn (
|
||
// IN ULONG Flags,
|
||
// IN ULONG SingleFlag
|
||
// );
|
||
//
|
||
// BOOLEAN
|
||
// BooleanFlagOn (
|
||
// IN ULONG Flags,
|
||
// IN ULONG SingleFlag
|
||
// );
|
||
//
|
||
// VOID
|
||
// SetFlag (
|
||
// IN ULONG Flags,
|
||
// IN ULONG SingleFlag
|
||
// );
|
||
//
|
||
// VOID
|
||
// ClearFlag (
|
||
// IN ULONG Flags,
|
||
// IN ULONG SingleFlag
|
||
// );
|
||
//
|
||
|
||
//#ifndef BooleanFlagOn
|
||
//#define BooleanFlagOn(F,SF) ( \
|
||
// (BOOLEAN)(((F) & (SF)) != 0) \
|
||
//)
|
||
//#endif
|
||
|
||
//#ifndef SetFlag
|
||
//#define SetFlag(Flags,SingleFlag) { \
|
||
// (Flags) |= (SingleFlag); \
|
||
//}
|
||
//#endif
|
||
|
||
//#ifndef ClearFlag
|
||
//#define ClearFlag(Flags,SingleFlag) { \
|
||
// (Flags) &= ~(SingleFlag); \
|
||
//}
|
||
//#endif
|
||
|
||
//
|
||
// This macro takes a pointer (or ulong) and returns its rounded up word
|
||
// value
|
||
//
|
||
|
||
#define WordAlign(Ptr) ( \
|
||
((((ULONG)(Ptr)) + 1) & 0xfffffffe) \
|
||
)
|
||
|
||
//
|
||
// This macro takes a pointer (or ulong) and returns its rounded up longword
|
||
// value
|
||
//
|
||
|
||
#define LongAlign(Ptr) ( \
|
||
((((ULONG)(Ptr)) + 3) & 0xfffffffc) \
|
||
)
|
||
|
||
//
|
||
// This macro takes a pointer (or ulong) and returns its rounded up quadword
|
||
// value
|
||
//
|
||
|
||
#define QuadAlign(Ptr) ( \
|
||
((((ULONG)(Ptr)) + 7) & 0xfffffff8) \
|
||
)
|
||
|
||
//
|
||
// This macro will up a 64 bit value to the next quad align boundary.
|
||
//
|
||
|
||
#define LiQuadAlign(LI,OUT) { \
|
||
*(OUT) = /*xxAdd*/( (LI) + 7 ); \
|
||
*((PULONG)(OUT)) &= 0xfffffff8; \
|
||
}
|
||
|
||
//
|
||
// CAST
|
||
// Add2Ptr (
|
||
// IN PVOID Pointer,
|
||
// IN ULONG Increment
|
||
// IN (CAST)
|
||
// );
|
||
//
|
||
// ULONG
|
||
// PtrOffset (
|
||
// IN PVOID BasePtr,
|
||
// IN PVOID OffsetPtr
|
||
// );
|
||
//
|
||
|
||
#define Add2Ptr(PTR,INC,CAST) ((CAST)((PUCHAR)(PTR) + (INC)))
|
||
|
||
#define PtrOffset(BASE,OFFSET) ((ULONG)((ULONG_PTR)(OFFSET) - (ULONG_PTR)(BASE)))
|
||
|
||
|
||
//
|
||
// The following macros are used to establish the semantics needed
|
||
// to do a return from within a try-finally clause. As a rule every
|
||
// try clause must end with a label call try_exit. For example,
|
||
//
|
||
// try {
|
||
// :
|
||
// :
|
||
//
|
||
// try_exit: NOTHING;
|
||
// } finally {
|
||
//
|
||
// :
|
||
// :
|
||
// }
|
||
//
|
||
// Every return statement executed inside of a try clause should use the
|
||
// try_return macro. If the compiler fully supports the try-finally construct
|
||
// then the macro should be
|
||
//
|
||
// #define try_return(S) { return(S); }
|
||
//
|
||
// If the compiler does not support the try-finally construct then the macro
|
||
// should be
|
||
//
|
||
// #define try_return(S) { S; goto try_exit; }
|
||
//
|
||
|
||
#define try_return(S) { S; goto try_exit; }
|
||
|
||
#endif // _LFSPROCS_
|