[Mono-list] NetworkStream.ReadByte behavior is differing from ms.net

[Francisco Figueiredo Jr.]

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Hi all,

While playing with NetworkStream.ReadByte in Npgsql I faced a situation
where Mono behavior is differing from ms.net.

If I establish a connection and later stop server while client is
connected and call NetworkStream.ReadByte() from client, ms.net throws a
SocketException wrapped inside an IOException, while Mono returns -1.

This is ms.net stack trace:

Unhandled Exception: System.IO.IOException: Unable to read data from the
transp
rt connection. ---> System.Net.Sockets.SocketException: Uma conexão
estabelecid
 foi anulada pelo software no computador host
   at System.Net.Sockets.Socket.Receive(Byte[] buffer, Int32 offset,
Int32 size
 SocketFlags socketFlags)
   at System.Net.Sockets.NetworkStream.Read(Byte[] buffer, Int32 offset,
Int32
ize)
   --- End of inner exception stack trace ---
   at System.Net.Sockets.NetworkStream.Read(Byte[] buffer, Int32 offset,
Int32
ize)
   at System.IO.BufferedStream.ReadByte()
   at Npgsql.NpgsqlState.ProcessBackendResponses_Ver_3(NpgsqlConnector
context)
   at Npgsql.NpgsqlState.ProcessBackendResponses(NpgsqlConnector context)
   at Npgsql.NpgsqlReadyState.Query(NpgsqlConnector context,
NpgsqlCommand comm
nd)
   at Npgsql.NpgsqlConnector.Query(NpgsqlCommand queryCommand)
   at Npgsql.NpgsqlCommand.ExecuteCommand()
   at Npgsql.NpgsqlCommand.ExecuteScalar()
   at c.Main(String[] args)



Checking mono source, it seems that it ends calling
System.Net.Sockets.Socket.Receive(Byte[] buffer, Int32 offset, Int32
size SocketFlags socketFlags) too from NetworkStream.Read().

Socket.Receive ends up calling Receive_nochecks which seems is not
realizing that the connection is broken and returns ok which makes
Receive returns ok without throwing any SocketException.

Can you confirm that?

The closest bug I could find about that is this:
http://bugzilla.ximian.com/show_bug.cgi?id=63233

But it talks about async calls which isn't my case.

If you can confirm that, I can fill a bug report.

Thanks in advance.


- --
Regards,

Francisco Figueiredo Jr.
http://fxjr.blogspot.com
Npgsql Lead Developer
http://pgfoundry.org/projects/npgsql
Mono Project Contributor
http://www.go-mono.com
MonoBrasil Project Founder Member
http://monobrasil.softwarelivre.org


- --
 - Would you tell me, please, which way I ought to go from here?
 - That depends a good deal on where you want to get to.
 		-- Lewis Carroll "Alice's Adventures in Wonderland"
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