topic Re: dumping core from a running process. in Operating System - Linux

dumping core from a running process.

Srimalik — Fri, 14 Mar 2008 14:58:16 GMT

Hi,

Can a process dump core and keep on running?

One way I could think of is:
fork and call abort in child.

Somewhere I have also come across a library which had routines which can generate a core for the running process. (you need to link with that lib and call a routine from that lib and it will dump core but continue running)
But I am not sure whether it was/is for HP-UX.
am again trying to find that, will post the link here.

Is there any signal in HP which does this ?

Thanks
Sri

Re: dumping core from a running process.

Srimalik — Fri, 14 Mar 2008 15:03:00 GMT

First link:

http://www.gsp.com/cgi-bin/man.cgi?section=1&topic=gcore

more coming...

Re: dumping core from a running process.

Fabio Ettore — Fri, 14 Mar 2008 15:19:27 GMT

Hi,

I was looking for something on native HP-UX commands but nothing about letting the process running, I has tried some options on kill:

kill -11

does force the core generation but kill the process also.

Here instead the gcore for HP-UX (that was for 11.00) provided by Dave Olker (HP):

<>

Also Ermin suggested another interesting tool, gdb has dumpcore. Download gdb from Porting:

<>

Hope this helps you.

Best regards,
Fabio

Re: dumping core from a running process.

Srimalik — Fri, 14 Mar 2008 15:27:39 GMT

Thanks,

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I am some method which i may be used in a process to dump core and keep running.

Re: dumping core from a running process.

Pete Randall — Fri, 14 Mar 2008 15:32:51 GMT

The trailing > symbol in the link is causing your problem. Try this:

http://forums11.itrc.hp.com/service/forums/questionanswer.do?admit=1094
47626+1205511296320+28353475&threadId=675379

Pete

Re: dumping core from a running process.

Fabio Ettore — Fri, 14 Mar 2008 16:22:55 GMT

Hi,

otherwise put in google

gcore hp-ux

and the first link you'll find is what I and Pete posted.

Best regards,
Fabio

Re: dumping core from a running process.

Srimalik — Fri, 14 Mar 2008 16:34:14 GMT

the link says kill -IOT will do the job
so a call to kill(SIGIOT) should solve my problem.
Never tried using this signal, will try this on monday.

Re: dumping core from a running process.

Dennis Handly — Fri, 14 Mar 2008 22:47:29 GMT

>Srikrishan: the link says kill -IOT will do the job. Never tried using this signal

Don't even think of using this bogus signal, erase it from your head. This is an obsolete name for SIGABRT, which of course will not continue.

Also, I think the intention in that old thread was not to continue.

On 11.31, there is a gcore(1) command.

Re: dumping core from a running process.

Srimalik — Sat, 15 Mar 2008 01:46:41 GMT

hi Dennis,

IOT is erased :)

what does gcore do to get a core dump from a process, Is there a sys API which gcore calls with pid of the process or smthing like that?

Parallely I am also trying to find out what does gcore actually do to get a core.

Thanks
Sri

Re: dumping core from a running process.

Dennis Handly — Sat, 15 Mar 2008 03:49:37 GMT

>what does gcore do to get a core dump from a process

It uses ttrace(2) on 11.31:
TT_PROC_ATTACH, TT_PROC_CORE, TT_PROC_DETACH

Re: dumping core from a running process.

Srimalik — Sat, 31 May 2008 06:43:26 GMT

used gdb to get a core.