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  3. February 2004

Re: CLP to decide if DDM file is available?


On Thursday, February 12, 2004, at 02:33 AM, Art Tostaine, Jr. wrote:

We are using DDM over TCP/IP.  I need to know if the file is available.
Mostly we are interested in communications issues, we already handle
times the file might not be available.

Previously with SNA I would just check the device status.

Now I guess I need to check PING results?

Ping just tells you TCP is up. Maybe that's enough. PING lets you control how its messages are returned. You could set MSGMODE(*QUIET *ESCAPE) and monitor for the failure messages.

Any better ideas appreciated.

I don't know about better but since you want to know if the remote file is available why not just attempt to open it?

pgm (&method)
dcl &method *char 4
if (&method *eq '*SNA') do
opndbf ddmf_sna option(*inp) opnid(thefile)
enddo
else if (&method *eq '*TCP') do
opndbf ddmf_tcp option(*input) opnid(thefile)
enddo
else do
sndpgmmsg msgid(cpf9898) msgf(qcpfmsg) msgdta('Method must be *SNA or *TCP) +
msgtype(*escape)
enddo
clof thefile
endpgm

This will verify communications, network, and file availability. Although my example distinguishes between SNA and TCP there is no need to do that. T=You can see the OPNDBF doesn't care about the transport mechanism.

Regards,
Simon Coulter.
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