[jcifs] Can JCIFS subscribe to a file change modification from SMB?

Christopher R. Hertel crh at ubiqx.mn.org
Wed Nov 14 10:29:49 MST 2012

The NT_TRANSACT_NOTIFY_CHANGE request is an SMB transaction, not an MS-RPC 
call.  It is carried within an SMB_COM_NT_TRANSACT exchange, and MS-RPC 
messages are transported over SMB_COM_TRANSACTIONs which are a little bit 

The SMB and MS-RPC mechanisms are quite similar, however, and that may be 
what Mike means here.

Note that any outstanding notification request counts against the 
MaxMpxCount limit.

Chris -)-----

On 11/14/2012 10:51 AM, Michael B Allen wrote:
> On Thu, Oct 11, 2012 at 3:39 PM, rickbliss <rick.blss at gmail.com> wrote:
>> It looks as though SMB supports a notification event when a directory is
>> changed [http://msdn.microsoft.com/en-us/library/ee380523(prot.20).aspx] ;
>> however, i am having diffuculty implementing this with JCIFS.  i dont want
>> to store an array and poll for changes, i would think that JCIFS could
>> subscribe , or recognize a change event?  Please help.
> Hi Rick,
> JCIFS does not implement the file change event part of the protocol.
> But it does have a pretty good MS-RPC framework under the hood that
> users have been successful in using to implement new functionality.
> You could add a method like
> SmbFile.addNotifyHandler(FileChangeHandler) and then call-back if
> something changes and so on. Look at jcifs.smb.SID.getServerSid as a
> good self-contained starting point for making an MS-RPC call. If you
> do the work, please post a patch.
> Also look in the patches directory to make sure someone has not
> already submitted the work.
> Mike

"Implementing CIFS - the Common Internet FileSystem" ISBN: 013047116X
Samba Team -- http://www.samba.org/     -)-----   Christopher R. Hertel
jCIFS Team -- http://jcifs.samba.org/   -)-----   ubiqx development, uninq.
ubiqx Team -- http://www.ubiqx.org/     -)-----   crh at ubiqx.mn.org
OnLineBook -- http://ubiqx.org/cifs/    -)-----   crh at ubiqx.org

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