skeleton for testing purposes

internal/system_check/win_ram.go

@@ -0,0 +1,44 @@
+package system_check
+
+import (
+	"log"
+	"unsafe"
+
+	"golang.org/x/sys/windows"
+)
+
+type memoryStatusEx struct {
+	/*
+	 * Struct for storing memory status information.
+	 *
+	 * It gets populated via syscall.
+	 */
+	dwLength                uint32
+	dwMemoryLoad            uint32
+	ullTotalPhys            uint64
+	ullAvailPhys            uint64
+	ullTotalPageFile        uint64
+	ullAvailPageFile        uint64
+	ullTotalVirtual         uint64
+	ullAvailVirtual         uint64
+	ullAvailExtendedVirtual uint64
+}
+
+func getWinRamInfo(procGlobalMemoryStatusEx *windows.LazyProc) MemoryInformation {
+	var mem memoryStatusEx
+
+	// * Windows requires the dwLength field to be set to the struct's size
+	// * before execution so it knows which OS struct version is being used.
+	mem.dwLength = uint32(unsafe.Sizeof(mem))
+
+	ret, _, err := procGlobalMemoryStatusEx.Call(uintptr(unsafe.Pointer(&mem))) // exec syscall
+
+	if ret == 0 { // winapi syscalls return 0 on failure
+		log.Fatalf("GlobalMemoryStatusEx failed: %v", err)
+	}
+
+	return MemoryInformation{
+		SystemMemory:    mem.ullTotalPhys,
+		AvailableMemory: mem.ullAvailPhys,
+	}
+}