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windows-nt/Source/XPSP1/NT/termsrv/perfts/perfutil.c

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/*++
Copyright (c) 1995-6 Microsoft Corporation
Module Name:
perfutil.c
Abstract:
This file implements the utility routines used to construct the
common parts of a PERF_INSTANCE_DEFINITION (see winperf.h) and
perform event logging functions.
Created:
Bob Watson 28-Jul-1995
Revision History:
--*/
//
// include files
//
#include <nt.h>
#include <ntrtl.h>
#include <nturtl.h>
#include <windows.h>
#include <string.h>
#include <winperf.h>
#include "perfutil.h"
#include "perfmsg.h"
//
// Global data definitions.
//
ULONG ulInfoBufferSize = 0;
extern HANDLE hEventLog; // event log handle for reporting events
// initialized in Open... routines
DWORD dwLogUsers = 0; // count of functions using event log
DWORD MESSAGE_LEVEL = 0;
const WCHAR GLOBAL_STRING[] = L"Global";
const WCHAR FOREIGN_STRING[] = L"Foreign";
const WCHAR COSTLY_STRING[] = L"Costly";
const WCHAR NULL_STRING[] = L"\0"; // pointer to null string
const WCHAR szTotalValue[] = L"TotalInstanceName";
const WCHAR szDefaultTotalString[] = L"_Total";
// test for delimiter, end of line and non-digit characters
// used by IsNumberInUnicodeList routine
//
#define DIGIT 1
#define DELIMITER 2
#define INVALID 3
#define EvalThisChar(c,d) ( \
(c == d) ? DELIMITER : \
(c == 0) ? DELIMITER : \
(c < (WCHAR)'0') ? INVALID : \
(c > (WCHAR)'9') ? INVALID : \
DIGIT)
LONG
GetPerflibKeyValue (
LPCWSTR szItem,
DWORD dwRegType,
DWORD dwMaxSize, // ... of pReturnBuffer in bytes
LPVOID pReturnBuffer,
DWORD dwDefaultSize, // ... of pDefault in bytes
LPVOID pDefault
)
/*++
read and return the current value of the specified value
under the Perflib registry key. If unable to read the value
return the default value from the argument list.
the value is returned in the pReturnBuffer.
--*/
{
HKEY hPerflibKey;
OBJECT_ATTRIBUTES Obja;
NTSTATUS Status;
UNICODE_STRING PerflibSubKeyString;
UNICODE_STRING ValueNameString;
LONG lReturn;
PKEY_VALUE_PARTIAL_INFORMATION pValueInformation;
DWORD ValueBufferLength;
DWORD ResultLength;
BOOL bUseDefault = TRUE;
// initialize UNICODE_STRING structures used in this function
RtlInitUnicodeString (
&PerflibSubKeyString,
L"\\Registry\\Machine\\SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Perflib");
RtlInitUnicodeString (
&ValueNameString,
(LPWSTR)szItem);
//
// Initialize the OBJECT_ATTRIBUTES structure and open the key.
//
InitializeObjectAttributes(
&Obja,
&PerflibSubKeyString,
OBJ_CASE_INSENSITIVE,
NULL,
NULL
);
Status = NtOpenKey(
&hPerflibKey,
KEY_READ,
&Obja
);
if (NT_SUCCESS( Status )) {
// read value of desired entry
ValueBufferLength = ResultLength = 1024;
pValueInformation = ALLOCMEM(RtlProcessHeap(), 0, ResultLength);
if (pValueInformation != NULL) {
while ( (Status = NtQueryValueKey(hPerflibKey,
&ValueNameString,
KeyValuePartialInformation,
pValueInformation,
ValueBufferLength,
&ResultLength))
== STATUS_BUFFER_OVERFLOW ) {
pValueInformation = REALLOCMEM(RtlProcessHeap(), 0,
pValueInformation,
ResultLength);
if ( pValueInformation == NULL) {
break;
} else {
ValueBufferLength = ResultLength;
}
}
if (NT_SUCCESS(Status)) {
// check to see if it's the desired type
if (pValueInformation->Type == dwRegType) {
// see if it will fit
if (pValueInformation->DataLength <= dwMaxSize) {
memcpy (pReturnBuffer, &pValueInformation->Data[0],
pValueInformation->DataLength);
bUseDefault = FALSE;
lReturn = STATUS_SUCCESS;
}
}
} else {
// return the default value
lReturn = Status;
}
// Release temp buffer. Check pValueInfo again since
// the realloc may have failed above.
if (pValueInformation != NULL) {
FREEMEM (RtlProcessHeap(), 0, pValueInformation);
}
} else {
// unable to allocate memory for this operation so
// just return the default value
}
// close the registry key
NtClose(hPerflibKey);
} else {
// return default value
}
if (bUseDefault) {
memcpy (pReturnBuffer, pDefault, dwDefaultSize);
lReturn = STATUS_SUCCESS;
}
return lReturn;
}
HANDLE
MonOpenEventLog (
IN LPWSTR szAppName
)
/*++
Routine Description:
Reads the level of event logging from the registry and opens the
channel to the event logger for subsequent event log entries.
Arguments:
None
Return Value:
Handle to the event log for reporting events.
NULL if open not successful.
--*/
{
HKEY hAppKey;
TCHAR LogLevelKeyName[] = TEXT("SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Perflib");
TCHAR LogLevelValueName[] = TEXT("EventLogLevel");
LONG lStatus;
DWORD dwLogLevel;
DWORD dwValueType;
DWORD dwValueSize;
// if global value of the logging level not initialized or is disabled,
// check the registry to see if it should be updated.
if (!MESSAGE_LEVEL) {
lStatus = RegOpenKeyEx (HKEY_LOCAL_MACHINE,
LogLevelKeyName,
0,
KEY_READ,
&hAppKey);
dwValueSize = sizeof (dwLogLevel);
if (lStatus == ERROR_SUCCESS) {
lStatus = RegQueryValueEx (hAppKey,
LogLevelValueName,
(LPDWORD)NULL,
&dwValueType,
(LPBYTE)&dwLogLevel,
&dwValueSize);
if (lStatus == ERROR_SUCCESS) {
MESSAGE_LEVEL = dwLogLevel;
} else {
MESSAGE_LEVEL = MESSAGE_LEVEL_DEFAULT;
}
RegCloseKey (hAppKey);
} else {
MESSAGE_LEVEL = MESSAGE_LEVEL_DEFAULT;
}
}
if (hEventLog == NULL){
hEventLog = RegisterEventSourceW (
(LPWSTR)NULL, // Use Local Machine
szAppName); // event log app name to find in registry
}
if (hEventLog != NULL) {
dwLogUsers++; // increment count of perfctr log users
}
return (hEventLog);
}
VOID
MonCloseEventLog (
)
/*++
Routine Description:
Closes the handle to the event logger if this is the last caller
Arguments:
None
Return Value:
None
--*/
{
if (hEventLog != NULL) {
dwLogUsers--; // decrement usage
if (dwLogUsers <= 0) { // and if we're the last, then close up log
DeregisterEventSource (hEventLog);
}
}
}
DWORD
GetQueryType (
IN LPWSTR lpValue
)
/*++
GetQueryType
returns the type of query described in the lpValue string so that
the appropriate processing method may be used
Arguments
IN lpValue
string passed to PerfRegQuery Value for processing
Return Value
QUERY_GLOBAL
if lpValue == 0 (null pointer)
lpValue == pointer to Null string
lpValue == pointer to "Global" string
QUERY_FOREIGN
if lpValue == pointer to "Foriegn" string
QUERY_COSTLY
if lpValue == pointer to "Costly" string
otherwise:
QUERY_ITEMS
--*/
{
WCHAR *pwcArgChar, *pwcTypeChar;
BOOL bFound;
if (lpValue == 0) {
return QUERY_GLOBAL;
} else if (*lpValue == 0) {
return QUERY_GLOBAL;
}
// check for "Global" request
pwcArgChar = lpValue;
pwcTypeChar = (LPWSTR)GLOBAL_STRING;
bFound = TRUE; // assume found until contradicted
// check to the length of the shortest string
while ((*pwcArgChar != 0) && (*pwcTypeChar != 0)) {
if (*pwcArgChar++ != *pwcTypeChar++) {
bFound = FALSE; // no match
break; // bail out now
}
}
if (bFound) return QUERY_GLOBAL;
// check for "Foreign" request
pwcArgChar = lpValue;
pwcTypeChar = (LPWSTR)FOREIGN_STRING;
bFound = TRUE; // assume found until contradicted
// check to the length of the shortest string
while ((*pwcArgChar != 0) && (*pwcTypeChar != 0)) {
if (*pwcArgChar++ != *pwcTypeChar++) {
bFound = FALSE; // no match
break; // bail out now
}
}
if (bFound) return QUERY_FOREIGN;
// check for "Costly" request
pwcArgChar = lpValue;
pwcTypeChar = (LPWSTR)COSTLY_STRING;
bFound = TRUE; // assume found until contradicted
// check to the length of the shortest string
while ((*pwcArgChar != 0) && (*pwcTypeChar != 0)) {
if (*pwcArgChar++ != *pwcTypeChar++) {
bFound = FALSE; // no match
break; // bail out now
}
}
if (bFound) return QUERY_COSTLY;
// if not Global and not Foreign and not Costly,
// then it must be an item list
return QUERY_ITEMS;
}
BOOL
IsNumberInUnicodeList (
IN DWORD dwNumber,
IN LPWSTR lpwszUnicodeList
)
/*++
IsNumberInUnicodeList
Arguments:
IN dwNumber
DWORD number to find in list
IN lpwszUnicodeList
Null terminated, Space delimited list of decimal numbers
Return Value:
TRUE:
dwNumber was found in the list of unicode number strings
FALSE:
dwNumber was not found in the list.
--*/
{
DWORD dwThisNumber;
WCHAR *pwcThisChar;
BOOL bValidNumber;
BOOL bNewItem;
WCHAR wcDelimiter; // could be an argument to be more flexible
if (lpwszUnicodeList == 0) return FALSE; // null pointer, # not founde
pwcThisChar = lpwszUnicodeList;
dwThisNumber = 0;
wcDelimiter = (WCHAR)' ';
bValidNumber = FALSE;
bNewItem = TRUE;
while (TRUE) {
switch (EvalThisChar (*pwcThisChar, wcDelimiter)) {
case DIGIT:
// if this is the first digit after a delimiter, then
// set flags to start computing the new number
if (bNewItem) {
bNewItem = FALSE;
bValidNumber = TRUE;
}
if (bValidNumber) {
dwThisNumber *= 10;
dwThisNumber += (*pwcThisChar - (WCHAR)'0');
}
break;
case DELIMITER:
// a delimter is either the delimiter character or the
// end of the string ('\0') if when the delimiter has been
// reached a valid number was found, then compare it to the
// number from the argument list. if this is the end of the
// string and no match was found, then return.
//
if (bValidNumber) {
if (dwThisNumber == dwNumber) return TRUE;
bValidNumber = FALSE;
}
if (*pwcThisChar == 0) {
return FALSE;
} else {
bNewItem = TRUE;
dwThisNumber = 0;
}
break;
case INVALID:
// if an invalid character was encountered, ignore all
// characters up to the next delimiter and then start fresh.
// the invalid number is not compared.
bValidNumber = FALSE;
break;
default:
break;
}
pwcThisChar++;
}
return FALSE;
} // IsNumberInUnicodeList
BOOL
MonBuildInstanceDefinition(
PERF_INSTANCE_DEFINITION *pBuffer,
PVOID *pBufferNext,
DWORD ParentObjectTitleIndex,
DWORD ParentObjectInstance,
DWORD UniqueID,
LPWSTR Name
)
/*++
MonBuildInstanceDefinition - Build an instance of an object
Inputs:
pBuffer - pointer to buffer where instance is to
be constructed
pBufferNext - pointer to a pointer which will contain
next available location, DWORD aligned
ParentObjectTitleIndex
- Title Index of parent object type; 0 if
no parent object
ParentObjectInstance
- Index into instances of parent object
type, starting at 0, for this instances
parent object instance
UniqueID - a unique identifier which should be used
instead of the Name for identifying
this instance
Name - Name of this instance
--*/
{
DWORD NameLength;
LPWSTR pName;
//
// Include trailing null in name size
//
NameLength = (lstrlenW(Name) + 1) * sizeof(WCHAR);
pBuffer->ByteLength = sizeof(PERF_INSTANCE_DEFINITION) +
NameLength;
pBuffer->ParentObjectTitleIndex = ParentObjectTitleIndex;
pBuffer->ParentObjectInstance = ParentObjectInstance;
pBuffer->UniqueID = UniqueID;
pBuffer->NameOffset = sizeof(PERF_INSTANCE_DEFINITION);
pBuffer->NameLength = NameLength;
// copy name to name buffer
pName = (LPWSTR)&pBuffer[1];
memcpy(pName,Name,NameLength);
// update "next byte" pointer
*pBufferNext = (PVOID) ((PCHAR) pBuffer + pBuffer->ByteLength);
// round up to put next buffer on a QUADWORD boundry
*pBufferNext = ALIGN_ON_QWORD (*pBufferNext);
// adjust length value to match new length
pBuffer->ByteLength = (ULONG)((ULONG_PTR)*pBufferNext - (ULONG_PTR)pBuffer);
return 0;
}
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