230 lines
6.1 KiB
C
230 lines
6.1 KiB
C
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/*++
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Copyright (c) 1992-1997 Microsoft Corporation
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Module Name:
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uptime.c
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Abstract:
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Contains routines to calculate sysUpTime.
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SnmpSvcInitUptime
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SnmpSvcGetUptime
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SnmpSvcGetUptimeFromTime
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Environment:
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User Mode - Win32
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Revision History:
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--*/
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///////////////////////////////////////////////////////////////////////////////
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// //
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// Include files //
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// //
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///////////////////////////////////////////////////////////////////////////////
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#include <nt.h>
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#include <windef.h>
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#include <ntrtl.h>
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#include <nturtl.h>
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#include <windows.h>
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#include <snmp.h>
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#include <snmputil.h>
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#include <ntfuncs.h>
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///////////////////////////////////////////////////////////////////////////////
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// //
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// Global Variables //
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// //
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///////////////////////////////////////////////////////////////////////////////
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DWORD g_dwUpTimeReference = 0;
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LONGLONG g_llUpTimeReference = 0;
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///////////////////////////////////////////////////////////////////////////////
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// //
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// Private Definitions //
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// //
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///////////////////////////////////////////////////////////////////////////////
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#define INVALID_UPTIME 0xFFFFFFFF
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///////////////////////////////////////////////////////////////////////////////
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// //
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// Private Procedures //
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// //
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///////////////////////////////////////////////////////////////////////////////
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DWORD
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SNMP_FUNC_TYPE
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SnmpSvcInitUptime(
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)
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/*++
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Routine Description:
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Initializes sysUpTime reference for SNMP process.
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Arguments:
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None.
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Return Values:
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Returns sysUpTime reference to pass to subagents.
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--*/
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{
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NTSTATUS NtStatus;
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SYSTEM_TIMEOFDAY_INFORMATION TimeOfDay;
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// obtain reference the outdated way
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g_dwUpTimeReference = GetCurrentTime();
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// query time in spiffy new precise manner
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NtStatus = NtQuerySystemInformation(
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SystemTimeOfDayInformation,
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&TimeOfDay,
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sizeof(SYSTEM_TIMEOFDAY_INFORMATION),
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NULL
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);
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// validate return code
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if (NT_SUCCESS(NtStatus)) {
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// initialize higher precision startup time
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g_llUpTimeReference = TimeOfDay.CurrentTime.QuadPart;
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}
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//
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// The algorithm for subagents to calculate sysUpTime
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// is based on GetCurrentTime() which returns the time
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// in milliseconds and therefore wraps every 49.71 days.
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// RFC1213 specifies that sysUpTime is to be returned in
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// centaseconds but we cannot break existing subagents.
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// The old value is returned to the master agent here
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// but newer subagents should use SnmpUtilGetUpTime.
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//
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return g_dwUpTimeReference;
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}
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///////////////////////////////////////////////////////////////////////////////
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// //
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// Public Procedures //
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// //
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///////////////////////////////////////////////////////////////////////////////
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DWORD
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SNMP_FUNC_TYPE
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SnmpSvcGetUptime(
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)
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/*++
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Routine Description:
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Retrieves sysUpTime for SNMP process.
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Arguments:
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None.
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Return Values:
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Returns sysUpTime value for use by subagents.
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--*/
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{
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DWORD dwUpTime = INVALID_UPTIME;
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NTSTATUS NtStatus;
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SYSTEM_TIMEOFDAY_INFORMATION TimeOfDay;
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// query time in spiffy new precise manner
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NtStatus = NtQuerySystemInformation(
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SystemTimeOfDayInformation,
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&TimeOfDay,
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sizeof(SYSTEM_TIMEOFDAY_INFORMATION),
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NULL
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);
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// validate return code
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if (NT_SUCCESS(NtStatus)) {
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LARGE_INTEGER liUpTime;
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LARGE_INTEGER liUpTimeInCentaseconds;
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// calculate difference from reference
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liUpTime.QuadPart = TimeOfDay.CurrentTime.QuadPart -
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g_llUpTimeReference;
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// convert 100ns units (10^-7) into centasecond units (10^-2)
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liUpTimeInCentaseconds = RtlExtendedLargeIntegerDivide(
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liUpTime,
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100000,
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NULL
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);
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// convert large integer to dword value
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dwUpTime = (DWORD)(LONGLONG)liUpTimeInCentaseconds.QuadPart;
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} else if (g_dwUpTimeReference != 0) {
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// calculate difference from reference
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dwUpTime = (GetCurrentTime() - g_dwUpTimeReference) / 10;
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}
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return dwUpTime;
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}
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DWORD
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SNMP_FUNC_TYPE
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SnmpSvcGetUptimeFromTime(
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DWORD dwUpTime
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)
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/*++
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Routine Description:
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Retrieves sysUpTime value for a given tick count.
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Arguments:
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dwUpTime - stack uptime (in centaseconds) to convert to sysUpTime
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Return Values:
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Returns sysUpTime value for use by subagents.
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--*/
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{
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DWORD dwUpTimeReferenceInCentaseconds;
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// convert 100ns units (10^-7) into centasecond units (10^-2)
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dwUpTimeReferenceInCentaseconds = (DWORD)(g_llUpTimeReference / 100000);
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if (dwUpTime < dwUpTimeReferenceInCentaseconds) {
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return 0;
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}
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// calculate difference from reference
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return dwUpTime - dwUpTimeReferenceInCentaseconds;
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}
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