public static int socketRead0(object _this, java.io.FileDescriptor fd, byte[] b, int off, int len, int timeout)
{
#if FIRST_PASS
return(0);
#else
// [IKVM] this method is a direct port of the native code in openjdk6-b18\jdk\src\windows\native\java\net\SocketInputStream.c
System.Net.Sockets.Socket socket = null;
int nread;
if (fd == null)
{
throw new SocketException("socket closed");
}
socket = fd.getSocket();
if (socket == null)
{
throw new SocketException("Socket closed");
}
if (timeout != 0)
{
if (timeout <= 5000 || !net_util_md.isRcvTimeoutSupported)
{
int ret = net_util_md.NET_Timeout(socket, timeout);
if (ret <= 0)
{
if (ret == 0)
{
throw new SocketTimeoutException("Read timed out");
}
else
{
// [IKVM] the OpenJDK native code is broken and always throws this exception on any failure of NET_Timeout
throw new SocketException("socket closed");
}
}
/*check if the socket has been closed while we were in timeout*/
if (fd.getSocket() == null)
{
throw new SocketException("Socket Closed");
}
}
}
nread = Winsock.recv(socket, b, off, len, 0);
if (nread > 0)
{
// ok
}
else
{
if (nread < 0)
{
/*
* Recv failed.
*/
switch (Winsock.WSAGetLastError())
{
case Winsock.WSAEINTR:
throw new SocketException("socket closed");
case Winsock.WSAECONNRESET:
case Winsock.WSAESHUTDOWN:
/*
* Connection has been reset - Windows sometimes reports
* the reset as a shutdown error.
*/
throw new sun.net.ConnectionResetException();
case Winsock.WSAETIMEDOUT:
throw new SocketTimeoutException("Read timed out");
default:
throw net_util_md.NET_ThrowCurrent("recv failed");
}
}
}
return(nread);
#endif
}
public static void socketWrite0(object _this, java.io.FileDescriptor fd, byte[] data, int off, int len)
{
#if !FIRST_PASS
// [IKVM] this method is a direct port of the native code in openjdk6-b18\jdk\src\windows\native\java\net\SocketOutputStream.c
const int MAX_BUFFER_LEN = 2048;
System.Net.Sockets.Socket socket;
int buflen = 65536; // MAX_HEAP_BUFFER_LEN
int n;
if (fd == null)
{
throw new SocketException("socket closed");
}
else
{
socket = fd.getSocket();
}
if (data == null)
{
throw new java.lang.NullPointerException("data argument");
}
while (len > 0)
{
int loff = 0;
int chunkLen = java.lang.Math.min(buflen, len);
int llen = chunkLen;
int retry = 0;
while (llen > 0)
{
n = Winsock.send(socket, data, off + loff, llen, 0);
if (n > 0)
{
llen -= n;
loff += n;
continue;
}
/*
* Due to a bug in Windows Sockets (observed on NT and Windows
* 2000) it may be necessary to retry the send. The issue is that
* on blocking sockets send/WSASend is supposed to block if there
* is insufficient buffer space available. If there are a large
* number of threads blocked on write due to congestion then it's
* possile to hit the NT/2000 bug whereby send returns WSAENOBUFS.
* The workaround we use is to retry the send. If we have a
* large buffer to send (>2k) then we retry with a maximum of
* 2k buffer. If we hit the issue with <=2k buffer then we backoff
* for 1 second and retry again. We repeat this up to a reasonable
* limit before bailing out and throwing an exception. In load
* conditions we've observed that the send will succeed after 2-3
* attempts but this depends on network buffers associated with
* other sockets draining.
*/
if (Winsock.WSAGetLastError() == Winsock.WSAENOBUFS)
{
if (llen > MAX_BUFFER_LEN)
{
buflen = MAX_BUFFER_LEN;
chunkLen = MAX_BUFFER_LEN;
llen = MAX_BUFFER_LEN;
continue;
}
if (retry >= 30)
{
throw new SocketException("No buffer space available - exhausted attempts to queue buffer");
}
System.Threading.Thread.Sleep(1000);
retry++;
continue;
}
/*
* Send failed - can be caused by close or write error.
*/
if (Winsock.WSAGetLastError() == Winsock.WSAENOTSOCK)
{
throw new SocketException("Socket closed");
}
else
{
throw net_util_md.NET_ThrowCurrent("socket write error");
}
}
len -= chunkLen;
off += chunkLen;
}
#endif
}
