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Re: 20010912: about xdr_product

Harry Chen wrote:
> 
> Hi Anne
> 
> >
> > First, I'm guessing you are using pqinsert to insert products into your
> > queue.  Is that correct?
> 
> yes
> 
> >
> > I'm going to make some guesses about your problem.   As you probably
> > know, this is the pq.c code that is failing:
> >
> > /*
> >  * XDR Encode or Decode "prod" to or from "buf" of size "size".
> >  */
> > static ptrdiff_t
> > xproduct(void *buf, size_t size, enum xdr_op op, product *prod)
> > {
> >         XDR xdrs[1] ;
> >         xdrmem_create(xdrs, buf, (u_int)size, op);
> >
> >         if (!xdr_product(xdrs, prod))
> >         {
> >                 uerror("xproduct: %s xdr_product() failed\n",
> >                         prod->info.ident);
> >                 return 0;
> >         }
> >
> >         /*      return xlen_product(prod) ; */
> >         return (xdrs->x_private - xdrs->x_base);
> > }
> >
> > I'm wondering if the call to xdrmem_create is failing.  Perhaps there's
> > not enough memory to write the data.  Or perhaps the 'size' variable is
> 
> Actually the data size is 0,  I just write the pattern of pqact.conf
> with the data file path into the pq as a text string. so the size would
> not longer than 256 byte.
> 
> > bad from being cast to an unsigned int.  The return value of that
> > function really should be tested.
> I add some code to write out the pq_insert() status, it show me as below
> some time.
> 
> Sep 14 07:15:51 mscsv3 /usr/local/ldm/logs[27206]: pq_insert:
> /usr/local/ldm/dat
> a/ldm.pq: I/O error
> 
> or some time like this.
> 
> Sep 13 09:27:26 mscsv3 /usr/local/ldm/logs[3440]: assertion
> "pIf(xdrs->x_op == X
> DR_ENCODE, *cpp != NULL && **cpp != 0)" failed: file "ldm_xdr.c", line
> 21
> 
> >
> >
> > Are you able to modify the code, rebuild it, and test these things, or
> > run the code in a debugger?
> 
> I worte the function code, referred from the ldm util, outside the ldm
> source tree.
> >
> > Also, what version of the LDM are you running?  And, what hardware and
> > operating system are you using?
> ldm-5.0.5 on DEC Alpha 4100 OSF1 V4.2
> 
> Hope I can fix the issue this weekend, we have launched the typhoon
> warning here.
> 
> Thank you

Hi Harry,

We are currently at version 5.1.4 of the LDM.  We haven't used 5.0.5 for
years, and we no longer support it.  

Also, I'm having a difficult time understanding what you are doing.  It
appears that you have written your own code, based on pqutil, that
inserts 0 length products into the queue with special product headers
that cause pqact to invoke routines to operate on files somewhere.  Is
this accurate?

In my question from my previous email I was asking if you were using the
LDM program 'pqinsert', not the library routine 'pq_insert'.  I see that
you are using 'pq_insert' but now I do not think that you are using
'pqinsert'.

I'm sorry to say that under these circumstances, a very old LDM version
coupled with your own custom software, I can't be of much help.  

I strongly encourage you to get the newest version of the LDM.  Using
our recommended file structure, you should be able to install it, test
it, and simply change a pointer if you want to go back to your older
version.  It's possible that your problem could be fixed by a newer
version, but I can't say for sure that it will.  Have you upgraded your
operating system recently?  Perhaps there's an incompatibility in the
XDR library with your old LDM version.

I'm sorry that I cannot be of further help on this particular problem. 
If you have further questions please let me know.  Good luck.

Anne
-- 
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Anne Wilson                     UCAR Unidata Program            
address@hidden                 P.O. Box 3000
                                  Boulder, CO  80307
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