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Re: sys-proctable segfault on Ruby 1.8.2

Berger, Daniel

3/14/2005 7:49:00 PM

> -----Original Message-----
> From: John-Mason P. Shackelford [mailto:john-mason@shackelford.org]
> Sent: Monday, March 14, 2005 12:43 PM
> To: ruby-talk ML
> Subject: sys-proctable segfault on Ruby 1.8.2
>
>
> On RHEL 3.0 I am seeing a segfault when I run the sample script:
>
> a = ProcTable.ps()
> a.each do |p|
> puts a.pid
> end
>
> I am running Ruby 1.8.2 (2004-12-25) with sys-proctable-0.6.4.
>
> Has anyone else seen this?

Hm...I don't have access to a Linux box at the moment, but I've run it
on different flavors of Linux without problem in the past.

Is RHEL 3.0 the 2.6.x kernel?

Can you do me a favor? Download Proc::ProcessTable (author: Dan Urist)
from search.cpan.org and try to run a sample Perl program (sys-proctable
is based on that code). If the Perl example works, then there's a bug
in my code. If his doesn't work, well, then I guess there's still a bug
in my code. At least I'll know it isn't something obvious, though. :)

Regards,

Dan
3 Answers

Kirk Haines

3/14/2005 8:22:00 PM

0

Berger, Daniel wrote:

>> On RHEL 3.0 I am seeing a segfault when I run the sample script:
>>
>> a = ProcTable.ps()
>> a.each do |p|
>> puts a.pid
>> end
>>
>> I am running Ruby 1.8.2 (2004-12-25) with sys-proctable-0.6.4.
>>
>> Has anyone else seen this?
>
> Hm...I don't have access to a Linux box at the moment, but I've run it
> on different flavors of Linux without problem in the past.
>
> Is RHEL 3.0 the 2.6.x kernel?

Bingo! That was it. That was the problem that I couldn't recall the
details of when I mentioned it to you a few weeks ago. :)

RHEL 3.0 is a 2.4 kernel.

Kirk Haines

John-Mason P. Shackelford

3/15/2005 6:52:00 PM

0

Dan,

Dan Urist's Proc::ProcessTable 0.39 seems to run fine for me. I just cut
and paste the example on
http://search.cpan.org/~durist/Proc-ProcessTable-0.39/Proce....

Thanks, BTW, for contributing win32utils--I am about to dig in there too.

Thanks again,


John-Mason P. Shackelford

djberg96

3/17/2005 4:46:00 AM

0

John-Mason P. Shackelford wrote:
> Dan,
>
> Dan Urist's Proc::ProcessTable 0.39 seems to run fine for me. I just
cut
> and paste the example on
>
http://search.cpan.org/~durist/Proc-ProcessTable-0.39/Proce....
>
> Thanks, BTW, for contributing win32utils--I am about to dig in there
too.
>
> Thanks again,
>
>
> John-Mason P. Shackelford

I can't duplicate this on my Suse install, but I have an idea. I think
the only difference between my version and Dan's is that I added an
'environ' struct member that contains a hash of key/value pairs based
on the environment of the process. So, I suspect that's where things
have gone wrong.

Do me a favor, and change this line (should be around line 157):

char key[64];

to this:

char key[256];

And see what happens. I wonder if you've got a process with an
environment variable greater than 64 characters. Anyway, I'll bet the
problem is somewhere in loop that tries to parse /proc/PID/environ.

Regards,

Dan