Where is MAX_LINGER_SECONDS definition

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VC6

C++

C

Dear,

I was try close socket but VC compiler report error message "error C2065: 'MAX_LINGER_SECONDS' : undeclared identifier".
Would you let me know, which header file have to include?

void CFtpc::CloseSocket( SOCKET *socket )
{
	fd_set				read_fds;
	fd_set				error_fds;
	struct timeval		t_timeout;
	if( *socket != INVALID_SOCKET )
	{
		if( shutdown( *socket, SD_BOTH ) != SOCKET_ERROR )
		{
			FD_ZERO( &read_fds );
			FD_ZERO( &error_fds );
			FD_SET( *socket, &read_fds );
			FD_SET( *socket, &error_fds );
			t_timeout.tv_sec = MAX_LINGER_SECONDS;
			t_timeout.tv_usec = 0;
			select( 1, &read_fds, NULL, &error_fds, &t_timeout );
		}
		closesocket( *socket );
		*socket = INVALID_SOCKET;
	}
}