internal SocketError DoOperationSendPackets(Socket socket, SafeCloseSocket handle)
{
Debug.Assert(_sendPacketsElements != null);
SendPacketsElement[] elements = (SendPacketsElement[])_sendPacketsElements.Clone();
FileStream[] files = new FileStream[elements.Length];
// Open all files synchronously ahead of time so that any exceptions are propagated
// to the caller, to match Windows behavior.
try
{
for (int i = 0; i < elements.Length; i++)
{
string path = elements[i]?.FilePath;
if (path != null)
{
files[i] = new FileStream(path, FileMode.Open, FileAccess.Read, FileShare.Read, 0x1000, useAsync: true);
}
}
}
catch (Exception exc)
{
// Clean up any files that were already opened.
foreach (FileStream s in files)
{
s?.Dispose();
}
// Windows differentiates the directory not being found from the file not being found.
// Approximate this by checking to see if the directory exists; this is only best-effort,
// as there are various things that could affect this, e.g. directory creation racing with
// this check, but it's good enough for most situations.
if (exc is FileNotFoundException fnfe)
{
string dirname = Path.GetDirectoryName(fnfe.FileName);
if (!string.IsNullOrEmpty(dirname) && !Directory.Exists(dirname))
{
throw new DirectoryNotFoundException(fnfe.Message);
}
}
// Otherwise propagate the original error.
throw;
}
SocketPal.SendPacketsAsync(socket, SendPacketsFlags, elements, files, (bytesTransferred, error) =>
{
if (error == SocketError.Success)
{
FinishOperationAsyncSuccess((int)bytesTransferred, SocketFlags.None);
}
else
{
FinishOperationAsyncFailure(error, (int)bytesTransferred, SocketFlags.None);
}
});
return(SocketError.IOPending);
}