Experimental Physics and
Industrial Control System

Andrew Johnson <[email protected]> · Fri, 21 Sep 2007 09:52:54 -0500

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

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System