At 09:37 AM 6/7/95 PDT, Dan Hollis wrote:
>Is there any way to _ensure_ the data has been sent and to the remote end
>and ACK'd before the connection is released? Graceful shutdown of sockets
>doesn't seem to work -- data still gets dropped (but no error is reported).
>
>AFAIK, you can only tell that the HP has sent all the data, but not that the
>remote end has ACK'd all of it. (This from watching a packet sniffer on the
>network).
 
I've always found that a graceful close works fine
 
Step    Client                                  Server
1       ...                                     ipcrecv()
2       ipcshutdown(Graceful)
3       ipcrecv()                               -detect graceful
4       Loop                                     ipcsend() -send
5           -get any remaining
6           ipcrecv()
7                                               ipcshutdown(immediate)
8       -detect close
9       ipcshutdown(immediate)
 
Steps 4 through 6 may not be needed.
 
How is the lack of a TCP ACK manifested as a problem?  At which end?
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