FreeTDS Development Group

[ark AT eltex.ru]

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nuqneH,

Played more with damned thing.. Could not find any way to handle OOB
properly (never programmed OOB before,so i can't figure out why sending
an OOB ny my proxy causes TIS plug-gw to close connection though it works
ok if it receives what expected to be the same data directly from SQL
client). Strange things happen there, so question is: is there a
way in TDS 4 to do the same thing without OOB? So if i receive OOB
crap can my proxy send some regular packet instead?

"Scott C. Gray" <gray AT voicenet.com> said :
 
[dd]

> In TDS 4.6, a cancel--or attention--request (usually made via a
> call to dbcancel() in db-library) generated an OOB packet which
> caused a SIGURG signal to be raised in the server on the other 
> end of the pipe.  Upon sending the OOB packet, the client library
> would then read and discard packets from the network until it
> received an acknowledgement of the packet from the server. Once
> it receivees this acknolwedgement it knows that the communications
> state of the network has been reset, packets are no longer waiting
> and it may now issue new queries.

[dd]

> To address this (and to provide a more portable mechanism--not
> all network stacks support OOB's), TDS 5.0 moved to in-band 
> cancelations.  Under this mechanism, attentions are sent 
> using a regular old packet (of type TDS_ATTENTION) down the
> network just like any other packet.

                                     _     _  _  _  _      _  _
 {::} {::} {::}  CU in Hell          _| o |_ | | _|| |   / _||_|   |_ |_ |_
 (##) (##) (##)        /Arkan#iD    |_  o  _||_| _||_| /   _|  | o |_||_||_|
 [||] [||] [||]            Do i believe in Bible? Hell,man,i've seen one!

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