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// SPDX-License-Identifier: BSD-3-Clause
//go:build windows
package mem
import (
"context"
"sync"
"syscall"
"unsafe"
"golang.org/x/sys/windows"
"github.com/shirou/gopsutil/v4/internal/common"
)
var (
procEnumPageFilesW = common.ModPsapi.NewProc("EnumPageFilesW")
procGetNativeSystemInfo = common.Modkernel32.NewProc("GetNativeSystemInfo")
procGetPerformanceInfo = common.ModPsapi.NewProc("GetPerformanceInfo")
procGlobalMemoryStatusEx = common.Modkernel32.NewProc("GlobalMemoryStatusEx")
)
type memoryStatusEx struct {
cbSize uint32
dwMemoryLoad uint32
ullTotalPhys uint64 // in bytes
ullAvailPhys uint64
ullTotalPageFile uint64
ullAvailPageFile uint64
ullTotalVirtual uint64
ullAvailVirtual uint64
ullAvailExtendedVirtual uint64
}
func VirtualMemory() (*VirtualMemoryStat, error) {
return VirtualMemoryWithContext(context.Background())
}
func VirtualMemoryWithContext(ctx context.Context) (*VirtualMemoryStat, error) {
var memInfo memoryStatusEx
memInfo.cbSize = uint32(unsafe.Sizeof(memInfo))
mem, _, _ := procGlobalMemoryStatusEx.Call(uintptr(unsafe.Pointer(&memInfo)))
if mem == 0 {
return nil, windows.GetLastError()
}
ret := &VirtualMemoryStat{
Total: memInfo.ullTotalPhys,
Available: memInfo.ullAvailPhys,
Free: memInfo.ullAvailPhys,
UsedPercent: float64(memInfo.dwMemoryLoad),
}
ret.Used = ret.Total - ret.Available
return ret, nil
}
type performanceInformation struct {
cb uint32
commitTotal uint64
commitLimit uint64
commitPeak uint64
physicalTotal uint64
physicalAvailable uint64
systemCache uint64
kernelTotal uint64
kernelPaged uint64
kernelNonpaged uint64
pageSize uint64
handleCount uint32
processCount uint32
threadCount uint32
}
func SwapMemory() (*SwapMemoryStat, error) {
return SwapMemoryWithContext(context.Background())
}
func SwapMemoryWithContext(ctx context.Context) (*SwapMemoryStat, error) {
// Use the performance counter to get the swap usage percentage
counter, err := common.NewWin32PerformanceCounter("swap_percentage", `\Paging File(_Total)\% Usage`)
if err != nil {
return nil, err
}
defer common.PdhCloseQuery.Call(uintptr(counter.Query))
usedPercent, err := counter.GetValue()
if err != nil {
return nil, err
}
// Get total memory from performance information
var perfInfo performanceInformation
perfInfo.cb = uint32(unsafe.Sizeof(perfInfo))
mem, _, _ := procGetPerformanceInfo.Call(uintptr(unsafe.Pointer(&perfInfo)), uintptr(perfInfo.cb))
if mem == 0 {
return nil, windows.GetLastError()
}
totalPhys := perfInfo.physicalTotal * perfInfo.pageSize
totalSys := perfInfo.commitLimit * perfInfo.pageSize
total := totalSys - totalPhys
var used uint64
if total > 0 {
used = uint64(0.01 * usedPercent * float64(total))
} else {
usedPercent = 0.0
used = 0
}
ret := &SwapMemoryStat{
Total: total,
Used: used,
Free: total - used,
UsedPercent: common.Round(usedPercent, 1),
}
return ret, nil
}
var (
pageSize uint64
pageSizeOnce sync.Once
)
type systemInfo struct {
wProcessorArchitecture uint16
wReserved uint16
dwPageSize uint32
lpMinimumApplicationAddress uintptr
lpMaximumApplicationAddress uintptr
dwActiveProcessorMask uintptr
dwNumberOfProcessors uint32
dwProcessorType uint32
dwAllocationGranularity uint32
wProcessorLevel uint16
wProcessorRevision uint16
}
// system type as defined in https://docs.microsoft.com/en-us/windows/win32/api/psapi/ns-psapi-enum_page_file_information
type enumPageFileInformation struct {
cb uint32
reserved uint32
totalSize uint64
totalInUse uint64
peakUsage uint64
}
func SwapDevices() ([]*SwapDevice, error) {
return SwapDevicesWithContext(context.Background())
}
func SwapDevicesWithContext(ctx context.Context) ([]*SwapDevice, error) {
pageSizeOnce.Do(func() {
var sysInfo systemInfo
procGetNativeSystemInfo.Call(uintptr(unsafe.Pointer(&sysInfo)))
pageSize = uint64(sysInfo.dwPageSize)
})
// the following system call invokes the supplied callback function once for each page file before returning
// see https://docs.microsoft.com/en-us/windows/win32/api/psapi/nf-psapi-enumpagefilesw
var swapDevices []*SwapDevice
result, _, _ := procEnumPageFilesW.Call(windows.NewCallback(pEnumPageFileCallbackW), uintptr(unsafe.Pointer(&swapDevices)))
if result == 0 {
return nil, windows.GetLastError()
}
return swapDevices, nil
}
// system callback as defined in https://docs.microsoft.com/en-us/windows/win32/api/psapi/nc-psapi-penum_page_file_callbackw
func pEnumPageFileCallbackW(swapDevices *[]*SwapDevice, enumPageFileInfo *enumPageFileInformation, lpFilenamePtr *[syscall.MAX_LONG_PATH]uint16) *bool {
*swapDevices = append(*swapDevices, &SwapDevice{
Name: syscall.UTF16ToString((*lpFilenamePtr)[:]),
UsedBytes: enumPageFileInfo.totalInUse * pageSize,
FreeBytes: (enumPageFileInfo.totalSize - enumPageFileInfo.totalInUse) * pageSize,
})
// return true to continue enumerating page files
ret := true
return &ret
}
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