text: // Copyright 2016 The go-ethereum Authors
  // This file is part of the go-ethereum library.
  //
  // The go-ethereum library is free software: you can redistribute it and/or modify
  // it under the terms of the GNU Lesser General Public License as published by
  // the Free Software Foundation, either version 3 of the License, or
  // (at your option) any later version.
  //
  // The go-ethereum library is distributed in the hope that it will be useful,
  // but WITHOUT ANY WARRANTY; without even the implied warranty of
  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  // GNU Lesser General Public License for more details.
  //
  // You should have received a copy of the GNU Lesser General Public License
  // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
  
  //+build windows
  
  package netutil
  
  import (
  	"net"
  	"os"
  	"syscall"
  )
  
  const _WSAEMSGSIZE = syscall.Errno(10040)
  
  // isPacketTooBig reports whether err indicates that a UDP packet didn't
  // fit the receive buffer. On Windows, WSARecvFrom returns
  // code WSAEMSGSIZE and no data if this happens.
  func isPacketTooBig(err error) bool {
  	if opErr, ok := err.(*net.OpError); ok {
  		if scErr, ok := opErr.Err.(*os.SyscallError); ok {
  			return scErr.Err == _WSAEMSGSIZE
  		}
  		return opErr.Err == _WSAEMSGSIZE
  	}
  	return false
  }
  