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// SPDX-License-Identifier: BSD-3-Clause
//go:build windows
package mem
import (
"unsafe"
)
// ExVirtualMemory represents Windows specific information
// https://learn.microsoft.com/en-us/windows/win32/api/sysinfoapi/ns-sysinfoapi-memorystatusex
// https://learn.microsoft.com/en-us/windows/win32/api/psapi/ns-psapi-performance_information
type ExVirtualMemory struct {
CommitLimit uint64 `json:"commitLimit"`
CommitTotal uint64 `json:"commitTotal"`
VirtualTotal uint64 `json:"virtualTotal"`
VirtualAvail uint64 `json:"virtualAvail"`
PhysTotal uint64 `json:"physTotal"`
PhysAvail uint64 `json:"physAvail"`
PageFileTotal uint64 `json:"pageFileTotal"`
PageFileAvail uint64 `json:"pageFileAvail"`
}
type ExWindows struct{}
func NewExWindows() *ExWindows {
return &ExWindows{}
}
func (*ExWindows) VirtualMemory() (*ExVirtualMemory, error) {
var memInfo memoryStatusEx
memInfo.cbSize = uint32(unsafe.Sizeof(memInfo))
// If mem == 0 since this is an error according to GlobalMemoryStatusEx documentation
// In that case, use err which is constructed from GetLastError(),
// see https://pkg.go.dev/golang.org/x/sys/windows#LazyProc.Call
mem, _, err := procGlobalMemoryStatusEx.Call(uintptr(unsafe.Pointer(&memInfo)))
if mem == 0 {
return nil, err
}
var perfInfo performanceInformation
perfInfo.cb = uint32(unsafe.Sizeof(perfInfo))
// Analogous to above: perf == 0 is an error according to the GetPerformanceInfo documentation,
// use err in that case
perf, _, err := procGetPerformanceInfo.Call(uintptr(unsafe.Pointer(&perfInfo)), uintptr(perfInfo.cb))
if perf == 0 {
return nil, err
}
ret := &ExVirtualMemory{
CommitLimit: perfInfo.commitLimit * perfInfo.pageSize,
CommitTotal: perfInfo.commitTotal * perfInfo.pageSize,
VirtualTotal: memInfo.ullTotalVirtual,
VirtualAvail: memInfo.ullAvailVirtual,
PhysTotal: memInfo.ullTotalPhys,
PhysAvail: memInfo.ullAvailPhys,
PageFileTotal: memInfo.ullTotalPageFile,
PageFileAvail: memInfo.ullAvailPageFile,
}
return ret, nil
}
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