Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!ucbvax!LNIC1.HPRC.UH.EDU!wescott
From: wescott@LNIC1.HPRC.UH.EDU (Andrew M. Wescott)
Newsgroups: comp.sys.apollo
Subject: Re:  SR10 /com/tb
Message-ID: <8904291529.AA00418@lnic1.hprc.uh.edu>
Date: 29 Apr 89 15:29:41 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The Internet
Lines: 37

Well I started with Apollos at SR 10, so I don't know what
you did at SR 9, but I think I know what to do at SR 10.  If
the process has in fact disappeared, you can't do just a
"tb" but rather you must do a "tb -n //node_spec" to examine
the process dump file on a particular node.  I suggest you
start with tb(1) "BSD Command Reference" and abort(3)
"BSD Programmer's Reference".

We also uncovered some interesting tb behavior for f77 (and I
assume /com/cc) in the Unix environment.  After a run-time
failure on f77 compiled code, we got "no traceback information
matched your specifications" after invoking tb.  I decided 
that this was a bug when we found that tb worked properly
with the same code compiled under the ftn front-end.  The
response to my APR came yesterday, and they told me that Unix
has "no concept" of a traceback (yes we've all gotten those
core dumps"), so a tb invoked immediately after bombing a
Unix compiled code would do nothing for me.  Hence you have
three options as I see it: (1) tb -n //node_spec , (2) set your
f77_dump_flag environment to "y", or (3) compile with the -g
switch (or you could use /com/ftn and /com/cc as we do).

I'm sure there are similar measures for /bin/cc, but those of
you who program more in C than I can figure that out.  This
was just a general comment on some differences between Aegis
and Unix.

What was that nonsense I read here recently about SR 10 not
being real Unix?  As far as manufacturer additions/deletions
go, I think all the manufacturers are guilty.  Maybe OSF will
give us a "real" Unix, but what I described above is certainly
the essence of Unix.


Andrew M. Wescott
University of Houston
Department of Chemical Engineering