github.com/waltonchain/waltonchain_gwtc_src@v1.1.4-0.20201225072101-8a298c95a819/p2p/netutil/toobig_windows.go (about)

     1  // Copyright 2016 The go-ethereum Authors
     2  // This file is part of the go-ethereum library.
     3  //
     4  // The go-wtc library is free software: you can redistribute it and/or modify
     5  // it under the terms of the GNU Lesser General Public License as published by
     6  // the Free Software Foundation, either version 3 of the License, or
     7  // (at your option) any later version.
     8  //
     9  // The go-wtc library is distributed in the hope that it will be useful,
    10  // but WITHOUT ANY WARRANTY; without even the implied warranty of
    11  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    12  // GNU Lesser General Public License for more details.
    13  //
    14  // You should have received a copy of the GNU Lesser General Public License
    15  // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
    16  
    17  //+build windows
    18  
    19  package netutil
    20  
    21  import (
    22  	"net"
    23  	"os"
    24  	"syscall"
    25  )
    26  
    27  const _WSAEMSGSIZE = syscall.Errno(10040)
    28  
    29  // isPacketTooBig reports whether err indicates that a UDP packet didn't
    30  // fit the receive buffer. On Windows, WSARecvFrom returns
    31  // code WSAEMSGSIZE and no data if this happens.
    32  func isPacketTooBig(err error) bool {
    33  	if opErr, ok := err.(*net.OpError); ok {
    34  		if scErr, ok := opErr.Err.(*os.SyscallError); ok {
    35  			return scErr.Err == _WSAEMSGSIZE
    36  		}
    37  		return opErr.Err == _WSAEMSGSIZE
    38  	}
    39  	return false
    40  }