+ app: unix, windows: require root user on first launch

os_windows.go

@@ -1,5 +1,28 @@
 package main
 
+import "golang.org/x/sys/windows"
+
 // Set user-specified limit of how many fd's we can use
 func setRlimit(val uint) {
 }
+
+func haveAdminRights() (bool, error) {
+	var token windows.Token
+	h, _ := windows.GetCurrentProcess()
+	err := windows.OpenProcessToken(h, windows.TOKEN_QUERY, &token)
+	if err != nil {
+		return false, err
+	}
+
+	info := make([]byte, 4)
+	var returnedLen uint32
+	err = windows.GetTokenInformation(token, windows.TokenElevation, &info[0], uint32(len(info)), &returnedLen)
+	token.Close()
+	if err != nil {
+		return false, err
+	}
+	if info[0] == 0 {
+		return false, nil
+	}
+	return true, nil
+}