p2p/discv5/udp_windows.go


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// 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 discv5

import (
    "net"
    "os"
    "syscall"
)

const _WSAEMSGSIZE = syscall.Errno(10040)

// 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
}