RBTrace Class Reference
class RBTrace : public RBusLogicalChannel
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Interface to the fast-trace memory buffer.
Inherited Functions
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RBusLogicalChannel::DoCancel(TUint)
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RBusLogicalChannel::DoControl(TInt)
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RBusLogicalChannel::DoControl(TInt,TAny *)
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RBusLogicalChannel::DoControl(TInt,TAny *,TAny *)
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RBusLogicalChannel::DoCreate(const TDesC &,const TVersion &,TInt,const TDesC *,const TDesC8 *,TOwnerType,TBool)
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RBusLogicalChannel::DoRequest(TInt,TRequestStatus &)
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RBusLogicalChannel::DoRequest(TInt,TRequestStatus &,TAny *)
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RBusLogicalChannel::DoRequest(TInt,TRequestStatus &,TAny *,TAny *)
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RBusLogicalChannel::DoSvControl(TInt)
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RBusLogicalChannel::DoSvControl(TInt,TAny *)
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RBusLogicalChannel::DoSvControl(TInt,TAny *,TAny *)
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RBusLogicalChannel::Open(RMessagePtr2,TInt,TOwnerType)
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RBusLogicalChannel::Open(TInt,TOwnerType)
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RHandleBase::Attributes()const
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RHandleBase::BTraceId()const
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RHandleBase::DoExtendedClose()
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RHandleBase::Duplicate(const RThread &,TOwnerType)
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RHandleBase::FullName()const
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RHandleBase::FullName(TDes &)const
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RHandleBase::Handle()const
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RHandleBase::HandleInfo(THandleInfo *)
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RHandleBase::Name()const
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RHandleBase::NotifyDestruction(TRequestStatus &)
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RHandleBase::Open(const TFindHandleBase &,TOwnerType)
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RHandleBase::OpenByName(const TDesC &,TOwnerType,TInt)
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RHandleBase::RHandleBase()
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RHandleBase::RHandleBase(TInt)
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RHandleBase::SetHandle(TInt)
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RHandleBase::SetHandleNC(TInt)
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RHandleBase::SetReturnedHandle(TInt)
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RHandleBase::SetReturnedHandle(TInt,RHandleBase &)
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Private Member Enumerations
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enum
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TControl
{
EOpenBuffer
,
EResizeBuffer
,
ESetFilter
,
ESetFilter2
,
ESetFilter2Array
,
ESetFilter2Global
,
EGetFilter2Part1
,
EGetFilter2Part2
,
ERequestData
,
ECancelRequestData
,
ESetSerialPortOutput
,
ESetTimestamp2Enabled
}
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Member Functions Documentation
BufferSize()
IMPORT_C
TInt
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BufferSize
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(
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)
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Get the current size of trace buffer.
CancelRequestData()
IMPORT_C void
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CancelRequestData
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(
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)
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Cancel any previous
RequestData()
, completing it with KErrCancel.
Close()
Close channel to fast-trace driver.
CloseChunk()
void
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CloseChunk
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(
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)
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[private]
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DataChunk()
The chunk in which trace data returned by
GetData()
resides.
DataUsed()
IMPORT_C void
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DataUsed
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(
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)
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Remove from the trace buffer all of the data returned by the last call to
GetData()
.
Filter(TUint)
Get the trace filter bit for the specified category.
Parameters
TUint
aCategory
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A category value from enum BTrace::TCategory,
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Filter2(TUint32 *&, TInt &)
Get the contents of the secondary trace filter.
Parameters
TUint32
*& aUids
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Pointer to array of UIDs contained in the secondary filter. Ownership of this array is passed to the caller of this function, which is then responsible for deleting it. If filter is empty, aUid equals zero.
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TInt
& aGlobalFilter
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Set to 1 if the secondary filter passes all traces. Set to 0 if the secondary filter rejects all traces. Set to -1 if the secondary filter operates by UIDs contained in traces.
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GetData(TUint8 *&)
Get pointer to as much contiguous trace data as is available. This data resides in the shared chunk
DataChunk()
. The data returned will always be a whole number of trace records, i.e. trace records will not be split between successive calls to this method. Once the data is no loger required,
DataUsed()
must be called. This method can be called repeatedly to get more trace data. E.g.
RBTrace trace;
TInt error = trace.Open();
if(error!=KErrNone)
return error;
const TInt KTraceDataBlockSize = 65536; // size of data we ideally want to process in one go
TUint8* data;
TInt size;
do
{
while((size=trace.GetData(data))!=0)
{
ProcessTheTraceData(data,size);
trace.DataUsed();
}
TRequestStatus waitStatus;
trace.RequestData(waitStatus,KTraceDataBlockSize);
User::WaitForRequest(waitStatus);
error = waitStatus.Int();
}
while(error==KErrNone);
trace.Close();
return error;
DataChunk()
;
Parameters
TUint8
*& aData
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Pointer to the first byte of trace data.
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Mode()
The operational mode for fast-trace.
Name()
const
TDesC
&
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Name
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(
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)
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[private, static, inline]
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Open()
Open channel to fast-trace driver. Must be called before any other methods are used.
OpenChunk()
TInt
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OpenChunk
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(
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)
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[private]
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RequestData(TRequestStatus &, TInt)
Request notification when trace data becomes available. Only one outstanding request may be present at any one time.
-
panic
-
BTRACE 0 if a previous request is still pending
Parameters
TRequestStatus
& aStatus
|
Request status to be complete with KErrNone once data becomes available.
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TInt
aSize
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The minimum number of bytes of trace data required. This is intended to improve performance by only signalling the client once a suitably large amount of trace data is available. However, this request may complete before this amount of trace data is available, therefore a client must be able to handle this situation. If aSize is zero or negative, then the request completes as soon as any trace data is available.
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ResizeBuffer(TInt)
IMPORT_C
TInt
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ResizeBuffer
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(
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TInt
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aSize
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)
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Change size of trace buffer. This causes all current data in the trace buffer to be lost. If this method fails then the trace buffer may no longer exist.
Parameters
TInt
aSize
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The size in bytes for the trace buffer.
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SetFilter(TUint, TInt)
Set the trace filter bit for the specified category.
Parameters
TUint
aCategory
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A category value from BTrace::TCategories.
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TInt
aValue
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The new filter value for the category. 1 means traces of this category are output, 0 means they are suppressed. Any other value will be ignored, and this method will just return the current value of the filter.
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SetFilter2(TUint32, TBool)
Set the trace secondary trace filter for the specified UID.
This method can not be used to disable a UID key if
SetFilter2(TInt aGlobalFilter)
has been used to set the filter to pass all traces. Such attempts result in a return code of KErrNotSupported.
Parameters
TUint32
aUid
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The UID to filter.
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TBool
aValue
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The new filter value for the UID. 1 means traces with this UID are output, 0 means they are suppressed. Other values must not be used.
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SetFilter2(const TUint32 *, TInt)
Set the secondary trace filter to include only the specified UIDs.
Parameters
const
TUint32
* aUids
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Pointer to array of UIDs.
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TInt
aNumUids
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Number of UID values pointer to by aUid.
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SetFilter2(TInt)
IMPORT_C
TInt
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SetFilter2
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(
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TInt
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aGlobalFilter
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)
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Set the secondary trace filter to pass or reject every trace.
Parameters
TInt
aGlobalFilter
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If 0, the secondary filter will reject all traces; if 1, all traces are passed by the filter. Other values have no effect.
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SetMode(TUint)
IMPORT_C void
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SetMode
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(
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TUint
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aMode
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)
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Set the operational mode for fast-trace. Calling this method, invalidates the trace data returned by the last call to
GetData()
.
Parameters
TUint
aMode
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A bitmask of values from TMode.
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SetSerialPortOutput(TBool)
SetTimestamp2Enabled(TBool)
IMPORT_C
TBool
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SetTimestamp2Enabled
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(
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TBool
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aEnable
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)
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Controls whether Timestamp2 field is added to trace record headers.
Member Enumerations Documentation
Enum TControl
Enumerators
EOpenBuffer
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EResizeBuffer
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ESetFilter
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ESetFilter2
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ESetFilter2Array
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ESetFilter2Global
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EGetFilter2Part1
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EGetFilter2Part2
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ERequestData
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ECancelRequestData
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ESetSerialPortOutput
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ESetTimestamp2Enabled
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Enum TMode
Bit flags indicating the operational mode of the fast-trace buffer.
Enumerators
EEnable = 1<<0
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Flag set to enable trace to be stored in the buffer. If this is not set, all trace records are discarded.
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EFreeRunning = 1<<1
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This flag dictates the behaviour which occurs when the trace buffer is too full to accomodate a new record. When this flag is set, new trace records will overwrite the oldest ones. When this flag is not set, new trace records are discard. (This latter mode provides the best performance.)
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Enum TPanic
Enumeration of panic reasons for category 'BTRACE'.
Enumerators
ERequestAlreadyPending
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A call to
RequestData()
was made whist a request was already pending.
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Member Data Documentation
TInt
iLastGetDataSize
TInt
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iLastGetDataSize
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[private]
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Copyright ©2010 Nokia Corporation and/or its subsidiary(-ies).
All rights
reserved. Unless otherwise stated, these materials are provided under the terms of the Eclipse Public License
v1.0.