merged from gramsrv upstream

cmd/telesrv/process_cpu_windows.go

@@ -0,0 +1,21 @@
+//go:build windows
+
+package main
+
+import "golang.org/x/sys/windows"
+
+func processCPUSeconds() (float64, bool) {
+	handle, err := windows.GetCurrentProcess()
+	if err != nil {
+		return 0, false
+	}
+	var creation, exit, kernel, user windows.Filetime
+	if err := windows.GetProcessTimes(handle, &creation, &exit, &kernel, &user); err != nil {
+		return 0, false
+	}
+	ns := kernel.Nanoseconds() + user.Nanoseconds()
+	if ns < 0 {
+		return 0, false
+	}
+	return float64(ns) / 1e9, true
+}