Re: Asyn/VXI-11 problems

[Andrew Johnson <anj@aps.anl.gov>]

Eric Norum wrote:
> > which leads to pseudo errors; errno should be checked only if the return
> > value is abnormal. It should be just
> >
> >     if(stat!=RPC_SUCCESS) {
> >         /* error handling */
> >     }
>
> Both the places where this code appears are preceded by assignments of 0 
> to errno.   The fact that this was done makes me think that the code was 
> placed there for a reason.  There appear to be several substandard 
> versions of RPC libraries out there.

That may be true (I have no knowledge), but on vxWorks at least what Ben 
says is right â if you haven't been handed an error return status you 
should assume that any value placed in errno has been handled internally 
by the routine you called.  I believe that older versions of auto-save/ 
restore suffered from the same misapprehension and generated bogus error 
messages as a result, but I think Tim Mooney has cleaned them all up now.

- Andrew
--
When a distinguished but elderly scientist states that something is
possible, he is almost certainly right.  When he states that something
is impossible, he is very probably wrong.  -- Arthur C. Clarke