Adding sysctl varaible into kernel.

Adding sysctl varaible into kernel.

[authn]

Hi,
Does anybody know how to add sysctl variable into kernel ? Maybe there is some 
function or I should change the kernel source?
-- 
Pozdrawiam,
Jan Opacki

Forcing a core dump

[Darío Mariani]

Hello:
   Is it possible to force a running program to generate a core dump. My 
problem is that I have a program that, from time to time, it freezes and 
I want to know what's going on.
   Thanks,

		Darío
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Re: Forcing a core dump

[Eric Bambach]

On Friday 20 August 2004 11:12 am, Darío Mariani wrote:
> Hello:
>    Is it possible to force a running program to generate a core dump. My
> problem is that I have a program that, from time to time, it freezes and
> I want to know what's going on.

	Others may correct me if I'm wrong, however if you issue a SIGSTOP or SIGKILL 
most programs will coredump will they not? You have to enable core dumping in 
your environment using ulimit -c (number in KB).
	Plus you should be able to attach gdb if its been compiled with debugging 
symbols, and even if it hasn't you will still get some debug control.
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-EB
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Re: Forcing a core dump

[Steven Smith]

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>   Is it possible to force a running program to generate a core dump. My 
> problem is that I have a program that, from time to time, it freezes and 
> I want to know what's going on.
If it's still attached to its terminal, Control-\ usually works.
Failing that, try kill -QUIT <pid_of_your_program>.

Steven Smith,
sos22@cantab.net.
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One day, I'm going to get an Alice-bot to answer all my email for me,
and see how long it takes people to notice.

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Re: Forcing a core dump

[Jan-Benedict Glaw]

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On Fri, 2004-08-20 13:12:37 -0300, Darío Mariani <dmarian@fi.uba.ar>
wrote in message <412622F5.2080208@fi.uba.ar>:
> Hello:
>   Is it possible to force a running program to generate a core dump. My 
> problem is that I have a program that, from time to time, it freezes and 
> I want to know what's going on.

SIGABRT is ment to do exactly that. However, "ulimit" must allow for the
core to be created and core dumps won't work with multi-threaded
programs (I heared rumors that this was changed in 2.6.x).

Also, in cases of a freeze, attaching a debugger (gdb) might help as
much:

$ gdb /path/to/your/program `pidof program`

MfG, JBG

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