// Copyright 2013 The win_pdh Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// +build windows
package win_pdh
import (
"syscall"
"unsafe"
)
// Error codes
const (
ERROR_SUCCESS = 0
ERROR_INVALID_FUNCTION = 1
)
type (
HANDLE uintptr
)
// PDH error codes, which can be returned by all Pdh* functions. Taken from mingw-w64 pdhmsg.h
const (
PDH_CSTATUS_VALID_DATA = 0x00000000 // The returned data is valid.
PDH_CSTATUS_NEW_DATA = 0x00000001 // The return data value is valid and different from the last sample.
PDH_CSTATUS_NO_MACHINE = 0x800007D0 // Unable to connect to the specified computer, or the computer is offline.
PDH_CSTATUS_NO_INSTANCE = 0x800007D1
PDH_MORE_DATA = 0x800007D2 // The PdhGetFormattedCounterArray* function can return this if there's 'more data to be displayed'.
PDH_CSTATUS_ITEM_NOT_VALIDATED = 0x800007D3
PDH_RETRY = 0x800007D4
PDH_NO_DATA = 0x800007D5 // The query does not currently contain any counters (for example, limited access)
PDH_CALC_NEGATIVE_DENOMINATOR = 0x800007D6
PDH_CALC_NEGATIVE_TIMEBASE = 0x800007D7
PDH_CALC_NEGATIVE_VALUE = 0x800007D8
PDH_DIALOG_CANCELLED = 0x800007D9
PDH_END_OF_LOG_FILE = 0x800007DA
PDH_ASYNC_QUERY_TIMEOUT = 0x800007DB
PDH_CANNOT_SET_DEFAULT_REALTIME_DATASOURCE = 0x800007DC
PDH_CSTATUS_NO_OBJECT = 0xC0000BB8
PDH_CSTATUS_NO_COUNTER = 0xC0000BB9 // The specified counter could not be found.
PDH_CSTATUS_INVALID_DATA = 0xC0000BBA // The counter was successfully found, but the data returned is not valid.
PDH_MEMORY_ALLOCATION_FAILURE = 0xC0000BBB
PDH_INVALID_HANDLE = 0xC0000BBC
PDH_INVALID_ARGUMENT = 0xC0000BBD // Required argument is missing or incorrect.
PDH_FUNCTION_NOT_FOUND = 0xC0000BBE
PDH_CSTATUS_NO_COUNTERNAME = 0xC0000BBF
PDH_CSTATUS_BAD_COUNTERNAME = 0xC0000BC0 // Unable to parse the counter path. Check the format and syntax of the specified path.
PDH_INVALID_BUFFER = 0xC0000BC1
PDH_INSUFFICIENT_BUFFER = 0xC0000BC2
PDH_CANNOT_CONNECT_MACHINE = 0xC0000BC3
PDH_INVALID_PATH = 0xC0000BC4
PDH_INVALID_INSTANCE = 0xC0000BC5
PDH_INVALID_DATA = 0xC0000BC6 // specified counter does not contain valid data or a successful status code.
PDH_NO_DIALOG_DATA = 0xC0000BC7
PDH_CANNOT_READ_NAME_STRINGS = 0xC0000BC8
PDH_LOG_FILE_CREATE_ERROR = 0xC0000BC9
PDH_LOG_FILE_OPEN_ERROR = 0xC0000BCA
PDH_LOG_TYPE_NOT_FOUND = 0xC0000BCB
PDH_NO_MORE_DATA = 0xC0000BCC
PDH_ENTRY_NOT_IN_LOG_FILE = 0xC0000BCD
PDH_DATA_SOURCE_IS_LOG_FILE = 0xC0000BCE
PDH_DATA_SOURCE_IS_REAL_TIME = 0xC0000BCF
PDH_UNABLE_READ_LOG_HEADER = 0xC0000BD0
PDH_FILE_NOT_FOUND = 0xC0000BD1
PDH_FILE_ALREADY_EXISTS = 0xC0000BD2
PDH_NOT_IMPLEMENTED = 0xC0000BD3
PDH_STRING_NOT_FOUND = 0xC0000BD4
PDH_UNABLE_MAP_NAME_FILES = 0x80000BD5
PDH_UNKNOWN_LOG_FORMAT = 0xC0000BD6
PDH_UNKNOWN_LOGSVC_COMMAND = 0xC0000BD7
PDH_LOGSVC_QUERY_NOT_FOUND = 0xC0000BD8
PDH_LOGSVC_NOT_OPENED = 0xC0000BD9
PDH_WBEM_ERROR = 0xC0000BDA
PDH_ACCESS_DENIED = 0xC0000BDB
PDH_LOG_FILE_TOO_SMALL = 0xC0000BDC
PDH_INVALID_DATASOURCE = 0xC0000BDD
PDH_INVALID_SQLDB = 0xC0000BDE
PDH_NO_COUNTERS = 0xC0000BDF
PDH_SQL_ALLOC_FAILED = 0xC0000BE0
PDH_SQL_ALLOCCON_FAILED = 0xC0000BE1
PDH_SQL_EXEC_DIRECT_FAILED = 0xC0000BE2
PDH_SQL_FETCH_FAILED = 0xC0000BE3
PDH_SQL_ROWCOUNT_FAILED = 0xC0000BE4
PDH_SQL_MORE_RESULTS_FAILED = 0xC0000BE5
PDH_SQL_CONNECT_FAILED = 0xC0000BE6
PDH_SQL_BIND_FAILED = 0xC0000BE7
PDH_CANNOT_CONNECT_WMI_SERVER = 0xC0000BE8
PDH_PLA_COLLECTION_ALREADY_RUNNING = 0xC0000BE9
PDH_PLA_ERROR_SCHEDULE_OVERLAP = 0xC0000BEA
PDH_PLA_COLLECTION_NOT_FOUND = 0xC0000BEB
PDH_PLA_ERROR_SCHEDULE_ELAPSED = 0xC0000BEC
PDH_PLA_ERROR_NOSTART = 0xC0000BED
PDH_PLA_ERROR_ALREADY_EXISTS = 0xC0000BEE
PDH_PLA_ERROR_TYPE_MISMATCH = 0xC0000BEF
PDH_PLA_ERROR_FILEPATH = 0xC0000BF0
PDH_PLA_SERVICE_ERROR = 0xC0000BF1
PDH_PLA_VALIDATION_ERROR = 0xC0000BF2
PDH_PLA_VALIDATION_WARNING = 0x80000BF3
PDH_PLA_ERROR_NAME_TOO_LONG = 0xC0000BF4
PDH_INVALID_SQL_LOG_FORMAT = 0xC0000BF5
PDH_COUNTER_ALREADY_IN_QUERY = 0xC0000BF6
PDH_BINARY_LOG_CORRUPT = 0xC0000BF7
PDH_LOG_SAMPLE_TOO_SMALL = 0xC0000BF8
PDH_OS_LATER_VERSION = 0xC0000BF9
PDH_OS_EARLIER_VERSION = 0xC0000BFA
PDH_INCORRECT_APPEND_TIME = 0xC0000BFB
PDH_UNMATCHED_APPEND_COUNTER = 0xC0000BFC
PDH_SQL_ALTER_DETAIL_FAILED = 0xC0000BFD
PDH_QUERY_PERF_DATA_TIMEOUT = 0xC0000BFE
)
// Formatting options for GetFormattedCounterValue().
const (
PDH_FMT_RAW = 0x00000010
PDH_FMT_ANSI = 0x00000020
PDH_FMT_UNICODE = 0x00000040
PDH_FMT_LONG = 0x00000100 // Return data as a long int.
PDH_FMT_DOUBLE = 0x00000200 // Return data as a double precision floating point real.
PDH_FMT_LARGE = 0x00000400 // Return data as a 64 bit integer.
PDH_FMT_NOSCALE = 0x00001000 // can be OR-ed: Do not apply the counter's default scaling factor.
PDH_FMT_1000 = 0x00002000 // can be OR-ed: multiply the actual value by 1,000.
PDH_FMT_NODATA = 0x00004000 // can be OR-ed: unknown what this is for, MSDN says nothing.
PDH_FMT_NOCAP100 = 0x00008000 // can be OR-ed: do not cap values > 100.
PERF_DETAIL_COSTLY = 0x00010000
PERF_DETAIL_STANDARD = 0x0000FFFF
)
type (
PDH_HQUERY HANDLE // query handle
PDH_HCOUNTER HANDLE // counter handle
)
// Union specialization for double values
type PDH_FMT_COUNTERVALUE_DOUBLE struct {
CStatus uint32
DoubleValue float64
}
// Union specialization for 64 bit integer values
type PDH_FMT_COUNTERVALUE_LARGE struct {
CStatus uint32
LargeValue int64
}
// Union specialization for long values
type PDH_FMT_COUNTERVALUE_LONG struct {
CStatus uint32
LongValue int32
padding [4]byte
}
// Union specialization for double values, used by PdhGetFormattedCounterArrayDouble()
type PDH_FMT_COUNTERVALUE_ITEM_DOUBLE struct {
SzName *uint16 // pointer to a string
FmtValue PDH_FMT_COUNTERVALUE_DOUBLE
}
// Union specialization for 'large' values, used by PdhGetFormattedCounterArrayLarge()
type PDH_FMT_COUNTERVALUE_ITEM_LARGE struct {
SzName *uint16 // pointer to a string
FmtValue PDH_FMT_COUNTERVALUE_LARGE
}
// Union specialization for long values, used by PdhGetFormattedCounterArrayLong()
type PDH_FMT_COUNTERVALUE_ITEM_LONG struct {
SzName *uint16 // pointer to a string
FmtValue PDH_FMT_COUNTERVALUE_LONG
}
var (
// Library
libpdhDll *syscall.DLL
// Functions
pdh_AddCounterW *syscall.Proc
pdh_AddEnglishCounterW *syscall.Proc
pdh_CloseQuery *syscall.Proc
pdh_CollectQueryData *syscall.Proc
pdh_GetFormattedCounterValue *syscall.Proc
pdh_GetFormattedCounterArrayW *syscall.Proc
pdh_OpenQuery *syscall.Proc
pdh_ValidatePathW *syscall.Proc
)
func init() {
// Library
libpdhDll = syscall.MustLoadDLL("pdh.dll")
// Functions
pdh_AddCounterW = libpdhDll.MustFindProc("PdhAddCounterW")
pdh_AddEnglishCounterW, _ = libpdhDll.FindProc("PdhAddEnglishCounterW") // XXX: only supported on versions > Vista.
pdh_CloseQuery = libpdhDll.MustFindProc("PdhCloseQuery")
pdh_CollectQueryData = libpdhDll.MustFindProc("PdhCollectQueryData")
pdh_GetFormattedCounterValue = libpdhDll.MustFindProc("PdhGetFormattedCounterValue")
pdh_GetFormattedCounterArrayW = libpdhDll.MustFindProc("PdhGetFormattedCounterArrayW")
pdh_OpenQuery = libpdhDll.MustFindProc("PdhOpenQuery")
pdh_ValidatePathW = libpdhDll.MustFindProc("PdhValidatePathW")
}
// Adds the specified counter to the query. This is the internationalized version. Preferably, use the
// function PdhAddEnglishCounter instead. hQuery is the query handle, which has been fetched by PdhOpenQuery.
// szFullCounterPath is a full, internationalized counter path (this will differ per Windows language version).
// dwUserData is a 'user-defined value', which becomes part of the counter information. To retrieve this value
// later, call PdhGetCounterInfo() and access dwQueryUserData of the PDH_COUNTER_INFO structure.
//
// Examples of szFullCounterPath (in an English version of Windows):
//
// \\Processor(_Total)\\% Idle Time
// \\Processor(_Total)\\% Processor Time
// \\LogicalDisk(C:)\% Free Space
//
// To view all (internationalized...) counters on a system, there are three non-programmatic ways: perfmon utility,
// the typeperf command, and the the registry editor. perfmon.exe is perhaps the easiest way, because it's basically a
// full implemention of the pdh.dll API, except with a GUI and all that. The registry setting also provides an
// interface to the available counters, and can be found at the following key:
//
// HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Perflib\CurrentLanguage
//
// This registry key contains several values as follows:
//
// 1
// 1847
// 2
// System
// 4
// Memory
// 6
// % Processor Time
// ... many, many more
//
// Somehow, these numeric values can be used as szFullCounterPath too:
//
// \2\6 will correspond to \\System\% Processor Time
//
// The typeperf command may also be pretty easy. To find all performance counters, simply execute:
//
// typeperf -qx
func PdhAddCounter(hQuery PDH_HQUERY, szFullCounterPath string, dwUserData uintptr, phCounter *PDH_HCOUNTER) uint32 {
ptxt, _ := syscall.UTF16PtrFromString(szFullCounterPath)
ret, _, _ := pdh_AddCounterW.Call(
uintptr(hQuery),
uintptr(unsafe.Pointer(ptxt)),
dwUserData,
uintptr(unsafe.Pointer(phCounter)))
return uint32(ret)
}
// Adds the specified language-neutral counter to the query. See the PdhAddCounter function. This function only exists on
// Windows versions higher than Vista.
func PdhAddEnglishCounter(hQuery PDH_HQUERY, szFullCounterPath string, dwUserData uintptr, phCounter *PDH_HCOUNTER) uint32 {
if pdh_AddEnglishCounterW == nil {
return ERROR_INVALID_FUNCTION
}
ptxt, _ := syscall.UTF16PtrFromString(szFullCounterPath)
ret, _, _ := pdh_AddEnglishCounterW.Call(
uintptr(hQuery),
uintptr(unsafe.Pointer(ptxt)),
dwUserData,
uintptr(unsafe.Pointer(phCounter)))
return uint32(ret)
}
// Closes all counters contained in the specified query, closes all handles related to the query,
// and frees all memory associated with the query.
func PdhCloseQuery(hQuery PDH_HQUERY) uint32 {
ret, _, _ := pdh_CloseQuery.Call(uintptr(hQuery))
return uint32(ret)
}
// Collects the current raw data value for all counters in the specified query and updates the status
// code of each counter. With some counters, this function needs to be repeatedly called before the value
// of the counter can be extracted with PdhGetFormattedCounterValue(). For example, the following code
// requires at least two calls:
//
// var handle win.PDH_HQUERY
// var counterHandle win.PDH_HCOUNTER
// ret := win.PdhOpenQuery(0, 0, &handle)
// ret = win.PdhAddEnglishCounter(handle, "\\Processor(_Total)\\% Idle Time", 0, &counterHandle)
// var derp win.PDH_FMT_COUNTERVALUE_DOUBLE
//
// ret = win.PdhCollectQueryData(handle)
// fmt.Printf("Collect return code is %x\n", ret) // return code will be PDH_CSTATUS_INVALID_DATA
// ret = win.PdhGetFormattedCounterValueDouble(counterHandle, 0, &derp)
//
// ret = win.PdhCollectQueryData(handle)
// fmt.Printf("Collect return code is %x\n", ret) // return code will be ERROR_SUCCESS
// ret = win.PdhGetFormattedCounterValueDouble(counterHandle, 0, &derp)
//
// The PdhCollectQueryData will return an error in the first call because it needs two values for
// displaying the correct data for the processor idle time. The second call will have a 0 return code.
func PdhCollectQueryData(hQuery PDH_HQUERY) uint32 {
ret, _, _ := pdh_CollectQueryData.Call(uintptr(hQuery))
return uint32(ret)
}
// Formats the given hCounter using a 'double'. The result is set into the specialized union struct pValue.
// This function does not directly translate to a Windows counterpart due to union specialization tricks.
func PdhGetFormattedCounterValueDouble(hCounter PDH_HCOUNTER, lpdwType *uint32, pValue *PDH_FMT_COUNTERVALUE_DOUBLE) uint32 {
ret, _, _ := pdh_GetFormattedCounterValue.Call(
uintptr(hCounter),
uintptr(PDH_FMT_DOUBLE),
uintptr(unsafe.Pointer(lpdwType)),
uintptr(unsafe.Pointer(pValue)))
return uint32(ret)
}
// Formats the given hCounter using a large int (int64). The result is set into the specialized union struct pValue.
// This function does not directly translate to a Windows counterpart due to union specialization tricks.
func PdhGetFormattedCounterValueLarge(hCounter PDH_HCOUNTER, lpdwType *uint32, pValue *PDH_FMT_COUNTERVALUE_LARGE) uint32 {
ret, _, _ := pdh_GetFormattedCounterValue.Call(
uintptr(hCounter),
uintptr(PDH_FMT_LARGE),
uintptr(unsafe.Pointer(lpdwType)),
uintptr(unsafe.Pointer(pValue)))
return uint32(ret)
}
// Formats the given hCounter using a 'long'. The result is set into the specialized union struct pValue.
// This function does not directly translate to a Windows counterpart due to union specialization tricks.
//
// BUG(krpors): Testing this function on multiple systems yielded inconsistent results. For instance,
// the pValue.LongValue kept the value '192' on test system A, but on B this was '0', while the padding
// bytes of the struct got the correct value. Until someone can figure out this behaviour, prefer to use
// the Double or Large counterparts instead. These functions provide actually the same data, except in
// a different, working format.
func PdhGetFormattedCounterValueLong(hCounter PDH_HCOUNTER, lpdwType *uint32, pValue *PDH_FMT_COUNTERVALUE_LONG) uint32 {
ret, _, _ := pdh_GetFormattedCounterValue.Call(
uintptr(hCounter),
uintptr(PDH_FMT_LONG),
uintptr(unsafe.Pointer(lpdwType)),
uintptr(unsafe.Pointer(pValue)))
return uint32(ret)
}
// Returns an array of formatted counter values. Use this function when you want to format the counter values of a
// counter that contains a wildcard character for the instance name. The itemBuffer must a slice of type PDH_FMT_COUNTERVALUE_ITEM_DOUBLE.
// An example of how this function can be used:
//
// okPath := "\\Process(*)\\% Processor Time" // notice the wildcard * character
//
// // ommitted all necessary stuff ...
//
// var bufSize uint32
// var bufCount uint32
// var size uint32 = uint32(unsafe.Sizeof(win.PDH_FMT_COUNTERVALUE_ITEM_DOUBLE{}))
// var emptyBuf [1]win.PDH_FMT_COUNTERVALUE_ITEM_DOUBLE // need at least 1 addressable null ptr.
//
// for {
// // collect
// ret := win.PdhCollectQueryData(queryHandle)
// if ret == win.ERROR_SUCCESS {
// ret = win.PdhGetFormattedCounterArrayDouble(counterHandle, &bufSize, &bufCount, &emptyBuf[0]) // uses null ptr here according to MSDN.
// if ret == win.PDH_MORE_DATA {
// filledBuf := make([]win.PDH_FMT_COUNTERVALUE_ITEM_DOUBLE, bufCount*size)
// ret = win.PdhGetFormattedCounterArrayDouble(counterHandle, &bufSize, &bufCount, &filledBuf[0])
// for i := 0; i < int(bufCount); i++ {
// c := filledBuf[i]
// var s string = win.UTF16PtrToString(c.SzName)
// fmt.Printf("Index %d -> %s, value %v\n", i, s, c.FmtValue.DoubleValue)
// }
//
// filledBuf = nil
// // Need to at least set bufSize to zero, because if not, the function will not
// // return PDH_MORE_DATA and will not set the bufSize.
// bufCount = 0
// bufSize = 0
// }
//
// time.Sleep(2000 * time.Millisecond)
// }
// }
func PdhGetFormattedCounterArrayDouble(hCounter PDH_HCOUNTER, lpdwBufferSize *uint32, lpdwBufferCount *uint32, itemBuffer *PDH_FMT_COUNTERVALUE_ITEM_DOUBLE) uint32 {
ret, _, _ := pdh_GetFormattedCounterArrayW.Call(
uintptr(hCounter),
uintptr(PDH_FMT_DOUBLE),
uintptr(unsafe.Pointer(lpdwBufferSize)),
uintptr(unsafe.Pointer(lpdwBufferCount)),
uintptr(unsafe.Pointer(itemBuffer)))
return uint32(ret)
}
// Returns an array of formatted counter values. Use this function when you want to format the counter values of a
// counter that contains a wildcard character for the instance name. The itemBuffer must a slice of type PDH_FMT_COUNTERVALUE_ITEM_LARGE.
// For an example usage, see PdhGetFormattedCounterArrayDouble.
func PdhGetFormattedCounterArrayLarge(hCounter PDH_HCOUNTER, lpdwBufferSize *uint32, lpdwBufferCount *uint32, itemBuffer *PDH_FMT_COUNTERVALUE_ITEM_LARGE) uint32 {
ret, _, _ := pdh_GetFormattedCounterArrayW.Call(
uintptr(hCounter),
uintptr(PDH_FMT_LARGE),
uintptr(unsafe.Pointer(lpdwBufferSize)),
uintptr(unsafe.Pointer(lpdwBufferCount)),
uintptr(unsafe.Pointer(itemBuffer)))
return uint32(ret)
}
// Returns an array of formatted counter values. Use this function when you want to format the counter values of a
// counter that contains a wildcard character for the instance name. The itemBuffer must a slice of type PDH_FMT_COUNTERVALUE_ITEM_LONG.
// For an example usage, see PdhGetFormattedCounterArrayDouble.
//
// BUG(krpors): See description of PdhGetFormattedCounterValueLong().
func PdhGetFormattedCounterArrayLong(hCounter PDH_HCOUNTER, lpdwBufferSize *uint32, lpdwBufferCount *uint32, itemBuffer *PDH_FMT_COUNTERVALUE_ITEM_LONG) uint32 {
ret, _, _ := pdh_GetFormattedCounterArrayW.Call(
uintptr(hCounter),
uintptr(PDH_FMT_LONG),
uintptr(unsafe.Pointer(lpdwBufferSize)),
uintptr(unsafe.Pointer(lpdwBufferCount)),
uintptr(unsafe.Pointer(itemBuffer)))
return uint32(ret)
}
// Creates a new query that is used to manage the collection of performance data.
// szDataSource is a null terminated string that specifies the name of the log file from which to
// retrieve the performance data. If 0, performance data is collected from a real-time data source.
// dwUserData is a user-defined value to associate with this query. To retrieve the user data later,
// call PdhGetCounterInfo and access dwQueryUserData of the PDH_COUNTER_INFO structure. phQuery is
// the handle to the query, and must be used in subsequent calls. This function returns a PDH_
// constant error code, or ERROR_SUCCESS if the call succeeded.
func PdhOpenQuery(szDataSource uintptr, dwUserData uintptr, phQuery *PDH_HQUERY) uint32 {
ret, _, _ := pdh_OpenQuery.Call(
szDataSource,
dwUserData,
uintptr(unsafe.Pointer(phQuery)))
return uint32(ret)
}
// Validates a path. Will return ERROR_SUCCESS when ok, or PDH_CSTATUS_BAD_COUNTERNAME when the path is
// erroneous.
func PdhValidatePath(path string) uint32 {
ptxt, _ := syscall.UTF16PtrFromString(path)
ret, _, _ := pdh_ValidatePathW.Call(uintptr(unsafe.Pointer(ptxt)))
return uint32(ret)
}
func UTF16PtrToString(s *uint16) string {
if s == nil {
return ""
}
return syscall.UTF16ToString((*[1 << 29]uint16)(unsafe.Pointer(s))[0:])
}
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