RE: Informix 4GL, HP, function C ... and core dumped !!
I had the same problem a few months back.. The fix was this: A non-initialized variable was being passed back to a calling function. This was causing a core dump. If I put a sleep or a display stmt in a certain place in the code the core dump went away. The wierd thing is where I would put a sleep stmt to fix the core dump was no where close to the actual problem. It has something to do with the the way the stack works, and if we push something new on it. I put display and sleep stms in until a located the exact position in the code that it was core dumping. Checked all the variables and saw one that was not being initialized. MattC POS Programmer Hastings Corp. > -----Original Message----- > From: Roland [SMTP:Roi@vifi.fr] > Sent: Tuesday, September 14, 1999 2:16 PM > To: informix-list@iiug.org; Rekaish Bhardwaj > Subject: Re: Informix 4GL, HP, function C ... and core dumped !! > > > -----Message d'origine----- > De : Rekaish Bhardwaj <RekaishB@compans.com> > @ : 'Roi@Vifi.fr' <Roi@Vifi.fr>; informix-list@iiug.org > <informix-list@iiug.org> > Date : mardi, 14. septembre 1999 15:27 > Objet : RE: Informix 4GL, HP, function C ... and core dumped !! > > > >When this sort of thing happens to me, more often than not, > >the problem is caused by an earlier (dodgy) piece of code. > > > >If as you say the core dump disappears when you put a prompt in, then > this > >often an indication > >that something in memory is not as it should by. I suspect that > putting any > >line of code, e.g. message, display or sleep 1 > >will also get rid of the core dump. If this is the case you should > beware > >that your program may then core dump a little later. > > ---------------------------------------------------------------------- > ------ > --- > No, it's not the case !!! > If I put another order, as SLEEP 1 (I try many orders !!) > I have the core dumped again !! > I haven't developped the whole code of this application ... may be, > there is > an overflowed array ??? > When I took this application to do some modifications (i.e. put in > transactional state with "commit work", do other modifications asked > by my > client) > I meet this problem !! > > I don't know exactly how Informix used stack !! > But in my mind, I think that may-be it's a 2 bits hard coded, read on > the > half ?? or something else !! > Eventually, it's possible that 4ge is more bigger ?? > > If you, or anyone has feedback ?? > Thanks > > Already, I've a friend who have eventually similar problem (but he is > not > sure !!) He left the problem "open" (i mean, he put the display order > ... > and alta la vista !!). But, I'm more curious and don't want to let > potential > problem !! > > > > >-----Original Message----- > >From: Pascale [mailto:Pascale.Desert@wanadoo.fr] > >Sent: Tuesday, September 14, 1999 3:53 AM > >To: informix-list@iiug.org > >Subject: Informix 4GL, HP, function C ... and core dumped !! > > > > > >Hi Gurus, > > > >I have a big problem on a 4GL 7.20 ud1x1 program on a HPux. > > > >I have about 10.000 lines of 4gls module and a call a C function > which > >quickly write in a flat file ; at each time, it wrote about 3 lines ; > at > the > >363th writing line, I have a "core dumped" when trying to wrote in > this > flat > >file; if I put a display " " before the call and a prompt after > the > >call, I don't have this "core dumped". > >Very strange !!! > >The display " " do nothing isn't it ??? and the prompt also ?? > > > >I work with a compiled 4GL 7.20ud1x1, and the code is about 4,6 Mo ; > may be > >it's too ?? > > > >I put the code on a SCO 4GL RDS and "no core dumped" > > > >What's wrong > > > >------------------------------------------------ > >this is an extract of the wrong code > >------------------------------------------------ > >... > >CALL fgl_write_str("a",PCtraceFP,MCmess) RETURNING PBok > >^ > >L-------------------- Call of the C function > >END IF > > > >display " " < --------------------- THIS DISPLAY DO NOTHING > > > >######################### > ># mod nov 1998 RT > >######################### > >IF PNmwstans1=1.0 OR > > PNmwstans2=1.0 OR > > PNmwstans3=1.0 OR > > PNmwstans4=1.0 OR > > PNmwstans1=3.0 OR > > PNmwstans2=3.0 OR > > PNmwstans3=3.0 OR > > PNmwstans4=3.0 THEN > > IF PImwstnr = 0 THEN > > # --> without this prompt and the "display nothing" above, > > # we have a core dump, I don t know why > > # on a rds compiler, don t need this > > # RoI / sept 99 > > # > > # may be it s the compiler version > > # INFORMIX-4GL Version 7.20.UD1X1 > > # Software Serial Number ACN#J288410 > > > > PROMPT "miss VAT num2, Press any key" FOR CHAR x_rep > > ^ > > L_______ THIS PROMPT IS NOT NECESSARY > >--------------------------------------------------------------------- > ------ > > > > > > > >Thanks for answer at RoI@vifi.fr > > > > > > > >