public static void SetTcpKeepAlive(this Socket socket, TcpKeepAliveSettings settings)
{
#if NETSTANDARD2_0
socket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.KeepAlive, true);
// the keep-alive option names are not available in netstandard2.0.
// but it seems that the value is passed to the PAL implementation
// so it should work if the runtime supports it.
// 3 = TcpKeepAliveTime, 17 = TcpKeepAliveInterval
socket.SetSocketOption(SocketOptionLevel.Tcp, (SocketOptionName)3, (int)settings.KeepAliveTime);
socket.SetSocketOption(SocketOptionLevel.Tcp, (SocketOptionName)17, (int)settings.KeepAliveInterval);
#else
// This is only supported on Windows
/* the native structure
* struct tcp_keepalive {
* ULONG onoff;
* ULONG keepalivetime;
* ULONG keepaliveinterval;
* };
*
* ULONG is an unsigned 32 bit integer
*/
int bytesPerUInt = 4;
byte[] inOptionValues = new byte[bytesPerUInt * 3];
BitConverter.GetBytes((uint)1).CopyTo(inOptionValues, 0);
BitConverter.GetBytes((uint)settings.KeepAliveTime).CopyTo(inOptionValues, bytesPerUInt);
BitConverter.GetBytes((uint)settings.KeepAliveInterval).CopyTo(inOptionValues, bytesPerUInt * 2);
socket.IOControl(IOControlCode.KeepAliveValues, inOptionValues, null);
#endif
}
public static void SetTcpKeepAlive(this Socket socket, TcpKeepAliveSettings settings)
{
/* the native structure
* struct tcp_keepalive {
* ULONG onoff;
* ULONG keepalivetime;
* ULONG keepaliveinterval;
* };
*
* ULONG is an unsigned 32 bit integer
*/
int bytesPerUInt = 4;
byte[] inOptionValues = new byte[bytesPerUInt * 3];
BitConverter.GetBytes((uint)1).CopyTo(inOptionValues, 0);
BitConverter.GetBytes((uint)settings.KeepAliveTime).CopyTo(inOptionValues, bytesPerUInt);
BitConverter.GetBytes((uint)settings.KeepAliveInterval).CopyTo(inOptionValues, bytesPerUInt * 2);
socket.IOControl(IOControlCode.KeepAliveValues, inOptionValues, null);
}