Recvfrom() 返回 WSAECONNRESET 代替阻塞或超時

使用winsock 的 recv from 函數時,可能收到　ICMP port unreachable 的錯誤，可以通過　WSAIoctl來設置，

win2000 要使用最新的 sp來獲得支持

 

DWORDdwBytesReturned = 0;
BOOLbNewBehavior = FALSE;
DWORDstatus;

// disable  new behavior using
// IOCTL: SIO_UDP_CONNRESET
status = WSAIoctl(sd, SIO_UDP_CONNRESET,
&bNewBehavior, sizeof(bNewBehavior),
                   NULL, 0, &dwBytesReturned,
                   NULL, NULL);

if (SOCKET_ERROR == status)
{
DWORD dwErr = WSAGetLastError();
if (WSAEWOULDBLOCK == dwErr)
{
// nothing to do
return(FALSE);
}
else
{
printf("WSAIoctl(SIO_UDP_CONNRESET) Error: %d/n", dwErr);
return(FALSE);
}
}