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// Copyright 2020 New Relic Corporation. All rights reserved.
// SPDX-License-Identifier: Apache-2.0
package sysinfo
import (
"syscall"
"unsafe"
)
// PhysicalMemoryBytes returns the total amount of host memory.
func PhysicalMemoryBytes() (uint64, error) {
// https://msdn.microsoft.com/en-us/library/windows/desktop/cc300158(v=vs.85).aspx
// http://stackoverflow.com/questions/30743070/query-total-physical-memory-in-windows-with-golang
mod := syscall.NewLazyDLL("kernel32.dll")
proc := mod.NewProc("GetPhysicallyInstalledSystemMemory")
var memkb uint64
ret, _, err := proc.Call(uintptr(unsafe.Pointer(&memkb)))
// return value TRUE(1) succeeds, FAILED(0) fails
if ret != 1 {
return 0, err
}
return memkb * 1024, nil
}
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