void TinyCLRFdSetToIntPtr(TinyCLRSockets.fd_set fd_set, IntPtr fds)
{
if (fds != IntPtr.Zero)
{
Marshal.StructureToPtr(fd_set, fds, true);
}
}
bool TinyCLRFdSetToFdSet(TinyCLRSockets.fd_set fd_setsrc, out List <Socket> fd_setDst)
{
bool fRes = true;
fd_setDst = null;
if (fd_setsrc != null)
{
fd_setDst = new List <Socket>();
for (int i = 0; i < fd_setsrc.count; i++)
{
SocketData sd;
if (!GetSocketData(fd_setsrc.fd_array[i], out sd))
{
fRes = false;
break;
}
if (sd.IsSelectable)
{
fd_setDst.Add(sd.Socket);
}
}
}
return(fRes);
}
TinyCLRSockets.fd_set IntPtrToTinyCLRFdSet(IntPtr fds)
{
TinyCLRSockets.fd_set fd_set = null;
if (fds != IntPtr.Zero)
{
fd_set = new TinyCLRSockets.fd_set();
Marshal.PtrToStructure(fds, fd_set);
}
return(fd_set);
}
bool FilterFd_set(List <Socket> fdNative, TinyCLRSockets.fd_set fdCLR)
{
if (fdNative != null)
{
Debug.Assert(fdCLR != null);
for (int i = 0; i < fdCLR.count;)
{
bool fSet = false;
Socket sock = null;
if (!GetSocket(fdCLR.fd_array[i], out sock))
{
return(false);
}
for (int j = 0; j < fdNative.Count; j++)
{
if (fdNative[j] == sock)
{
fSet = true;
break;
}
}
if (!fSet)
{
Array.Copy(fdCLR.fd_array, i + 1, fdCLR.fd_array, i, fdCLR.count - i - 1);
fdCLR.count--;
}
else
{
i++;
}
}
}
return(true);
}
int ISocketsDriver.select(int nfds, IntPtr readfds, IntPtr writefds, IntPtr exceptfds, ref TimeVal timeout)
{
List <Socket> readList;
List <Socket> writeList;
List <Socket> exceptList;
int ret = 0;
TinyCLRSockets.fd_set read = IntPtrToTinyCLRFdSet(readfds);
TinyCLRSockets.fd_set write = IntPtrToTinyCLRFdSet(writefds);
TinyCLRSockets.fd_set except = IntPtrToTinyCLRFdSet(exceptfds);
if (!TinyCLRFdSetToFdSet(read, out readList))
{
return(ReturnError(SocketError.NotSocket));
}
if (!TinyCLRFdSetToFdSet(write, out writeList))
{
return(ReturnError(SocketError.NotSocket));
}
if (!TinyCLRFdSetToFdSet(except, out exceptList))
{
return(ReturnError(SocketError.NotSocket));
}
if ((readList != null && readList.Count > 0) ||
(writeList != null && writeList.Count > 0) ||
(exceptList != null && exceptList.Count > 0))
{
try
{
//Socket.Select(readList, writeList, exceptList, timeout.tv_usec);
InternalSelect(readList, writeList, exceptList);
}
catch (SocketException se)
{
ret = ReturnError(se.SocketErrorCode);
}
}
if (!FilterFd_set(readList, read))
{
return(ReturnError(SocketError.NotSocket));
}
if (!FilterFd_set(writeList, write))
{
return(ReturnError(SocketError.NotSocket));
}
if (!FilterFd_set(exceptList, except))
{
return(ReturnError(SocketError.NotSocket));
}
TinyCLRFdSetToIntPtr(read, readfds);
TinyCLRFdSetToIntPtr(write, writefds);
TinyCLRFdSetToIntPtr(except, exceptfds);
if (ret != (int)SocketError.SocketError)
{
if (readList != null)
{
ret += readList.Count;
}
if (writeList != null)
{
ret += writeList.Count;
}
if (exceptList != null)
{
ret += exceptList.Count;
}
}
return(ret);
}