120 lines
2.5 KiB
C
120 lines
2.5 KiB
C
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/*++
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Copyright (c) 2000 Microsoft Corporation
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Module Name:
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counter.c
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Abstract:
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User-mode interface to UL.SYS performance counter collection API
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Author:
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Eric Stenson (ericsten) 28-Sept-2000
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Revision History:
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--*/
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#include "precomp.h"
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//
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// Private macros.
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//
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//
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// Private prototypes.
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//
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//
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// Public functions.
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//
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/***************************************************************************++
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Routine Description:
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Gathers the perf counters for UL.SYS
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Arguments:
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pControlChannelHandle - A handle to the control channel of UL.SYS
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CounterGroup - which counter set to get (global or site)
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pSizeCounterBlock - (IN) size of buffer, (OUT) bytes written if successful,
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zero otherwise
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pCounterBlocks - Buffer to receive the returned counter data block(s)
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pNumInstances - number of blocks returned.
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Return Values:
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STATUS_INSUFFICIENT_RESOURCES
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STATUS_INVALID_DEVICE_REQUEST
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STATUS_INVALID_PARAMETER
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--***************************************************************************/
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ULONG
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WINAPI
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HttpGetCounters(
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IN HANDLE ControlChannelHandle,
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IN HTTP_COUNTER_GROUP CounterGroup,
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IN OUT PULONG pSizeCounterBlock,
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IN OUT PVOID pCounterBlocks,
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OUT PULONG pNumInstances OPTIONAL
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)
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{
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NTSTATUS Status;
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Status = HttpApiSynchronousDeviceControl(
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ControlChannelHandle, // FileHandle
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IOCTL_HTTP_GET_COUNTERS, // IoControlCode
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&CounterGroup, // pInputBuffer
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sizeof(HTTP_COUNTER_GROUP), // InputBufferLength
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pCounterBlocks, // pOutputBuffer
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*pSizeCounterBlock, // OutputBufferLength
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pSizeCounterBlock // pBytesTransferred
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);
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//
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// Calc the number of blocks returned.
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//
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if (STATUS_SUCCESS == Status)
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{
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if (pNumInstances)
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{
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if (HttpCounterGroupGlobal == CounterGroup)
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{
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*pNumInstances = (*pSizeCounterBlock / sizeof(HTTP_GLOBAL_COUNTERS));
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}
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else
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{
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ASSERT(HttpCounterGroupSite == CounterGroup);
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*pNumInstances = (*pSizeCounterBlock / sizeof(HTTP_SITE_COUNTERS));
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}
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}
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}
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else
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{
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if (pSizeCounterBlock)
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*pSizeCounterBlock = 0;
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if (pNumInstances)
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*pNumInstances = 0;
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}
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return HttpApiNtStatusToWin32Status( Status );
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}
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