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/*++
Copyright (c) 1992 Microsoft Corporation
Module Name:
trace.c
Abstract:
This is the source file that implements the a general purpose trace
package. The trace package is a debug facility for generating
arbitrary events into a circular buffer. The debugger than has a
!trace command to dump out the last N events from a trace buffer.
Author:
Steve Wood (stevewo) 12-Apr-1994
Revision History:
--*/
#include "ntrtlp.h"
#include "heap.h"
#ifndef THEAP
#define DPRINTF DbgPrint
#endif
NTSYSAPI
PRTL_TRACE_BUFFER
RtlCreateTraceBuffer(
IN ULONG BufferSize,
IN ULONG NumberOfEventIds
)
{
NTSTATUS Status;
PRTL_TRACE_BUFFER TraceBuffer;
TraceBuffer = NULL;
BufferSize += FIELD_OFFSET( RTL_TRACE_BUFFER, EventIdFormatString ) +
(NumberOfEventIds * sizeof( PCHAR ));
Status = NtAllocateVirtualMemory( NtCurrentProcess(),
&TraceBuffer,
0,
&BufferSize,
MEM_COMMIT,
PAGE_READWRITE
);
if (!NT_SUCCESS( Status )) {
KdPrint(( "RTL: Unable to allocate trace buffer (%x bytes) - Status == %x\n", BufferSize, Status ));
return NULL;
}
TraceBuffer->Signature = RTL_TRACE_SIGNATURE;
TraceBuffer->NumberOfRecords = 0;
TraceBuffer->NumberOfEventIds = (USHORT)NumberOfEventIds;
TraceBuffer->StartBuffer = (PRTL_TRACE_RECORD)(&TraceBuffer->EventIdFormatString[ NumberOfEventIds ]);
TraceBuffer->EndBuffer = (PRTL_TRACE_RECORD)((PCHAR)TraceBuffer + BufferSize);
TraceBuffer->ReadRecord = NULL;
TraceBuffer->WriteRecord = TraceBuffer->StartBuffer;
return TraceBuffer;
}
NTSYSAPI
void
RtlDestroyTraceBuffer(
IN PRTL_TRACE_BUFFER TraceBuffer
)
{
ULONG RegionSize;
RegionSize = 0;
NtFreeVirtualMemory( NtCurrentProcess(),
&TraceBuffer,
&RegionSize,
MEM_RELEASE
);
return;
}
NTSYSAPI
void
RtlTraceEvent(
IN PRTL_TRACE_BUFFER TraceBuffer,
IN ULONG EventId,
IN ULONG NumberOfArguments,
...
)
{
va_list arglist;
ULONG i, Size;
PRTL_TRACE_RECORD p, p1;
if (TraceBuffer == NULL ||
EventId >= TraceBuffer->NumberOfEventIds ||
NumberOfArguments > RTL_TRACE_MAX_ARGUMENTS_FOR_EVENT
) {
return;
}
Size = FIELD_OFFSET( RTL_TRACE_RECORD, Arguments ) +
(NumberOfArguments * sizeof( ULONG ));
// DPRINTF( "Trace - R: %x W: %x Size: %u", TraceBuffer->ReadRecord, TraceBuffer->WriteRecord, Size );
p = TraceBuffer->WriteRecord;
p1 = (PRTL_TRACE_RECORD)((PCHAR)p + Size);
while (TraceBuffer->ReadRecord >= p && TraceBuffer->ReadRecord <= p1) {
TraceBuffer->ReadRecord = (PRTL_TRACE_RECORD)((PCHAR)TraceBuffer->ReadRecord + TraceBuffer->ReadRecord->Size);
if (TraceBuffer->ReadRecord >= TraceBuffer->EndBuffer) {
TraceBuffer->ReadRecord = TraceBuffer->StartBuffer;
}
}
if (p1 >= TraceBuffer->EndBuffer) {
if (p != TraceBuffer->EndBuffer) {
p->Size = (PCHAR)TraceBuffer->EndBuffer - (PCHAR)p;
p->EventId = RTL_TRACE_FILLER_EVENT_ID;
}
p = TraceBuffer->StartBuffer;
}
p1 = (PRTL_TRACE_RECORD)((PCHAR)p + Size);
if (((PCHAR)TraceBuffer->EndBuffer - (PCHAR)p1) < FIELD_OFFSET( RTL_TRACE_RECORD, Arguments )) {
Size += (PCHAR)TraceBuffer->EndBuffer - (PCHAR)p1;
p1 = (PRTL_TRACE_RECORD)((PCHAR)p + Size);
}
while (TraceBuffer->ReadRecord >= p && TraceBuffer->ReadRecord <= p1) {
TraceBuffer->ReadRecord = (PRTL_TRACE_RECORD)((PCHAR)TraceBuffer->ReadRecord + TraceBuffer->ReadRecord->Size);
if (TraceBuffer->ReadRecord >= TraceBuffer->EndBuffer) {
TraceBuffer->ReadRecord = TraceBuffer->StartBuffer;
}
}
p->Size = Size;
p->EventId = (USHORT)EventId;
p->NumberOfArguments = (USHORT)NumberOfArguments;
va_start( arglist, NumberOfArguments );
for (i=0; i<NumberOfArguments; i++) {
p->Arguments[ i ] = va_arg( arglist, ULONG );
}
va_end( arglist );
if (TraceBuffer->ReadRecord == NULL) {
TraceBuffer->ReadRecord = p;
}
TraceBuffer->WriteRecord = p1;
// DPRINTF( " R: %x W: %x O: %d N: %d\n", TraceBuffer->ReadRecord, TraceBuffer->WriteRecord, OldReadWriteDifference, NewReadWriteDifference );
return;
}
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