/proc question

/proc question

[Davy Durham]

After much research.. I have a question regarding /proc

I have a zombie process which has apparently died for some unknown 
reason.. I know it was terminated by a signal (found that from the 9th 
field (sheduler flags) in /proc/pid/stat)

However, I'm trying to figure out what signal killed it.

Also, it would be nice if /proc could show what the exit status of a 
dead process is.. seems strange that it doesn't contain that information 
(or am I just not seeing it in there).


Any info would be helpful.. thanks,
  Davy

Re: /proc question

[Jan Engelhardt]

> I have a zombie process which has apparently died for some unknown reason.. I
> know it was terminated by a signal (found that from the 9th field (sheduler
> flags) in /proc/pid/stat)

Start the process under the observation of strace.

> However, I'm trying to figure out what signal killed it.


Jan Engelhardt
-- 

Re: /proc question

[Davy Durham]

Jan Engelhardt wrote:

>>I have a zombie process which has apparently died for some unknown reason.. I
>>know it was terminated by a signal (found that from the 9th field (sheduler
>>flags) in /proc/pid/stat)
>>    
>>
>
>Start the process under the observation of strace.
>
>  
>
>>However, I'm trying to figure out what signal killed it.
>>    
>>
>
>
>Jan Engelhardt
>  
>
Wish I could.. but it's already happened (to a lot of processes for the 
same reason)

It's an intermittant problem and can't really reproduce it at will.

I've redeployed the binary now so I can hopefully attach to it with gdb 
to figure out some things next time it does happen.

/proc question

[Surenkumar Nihalani]

Hello All, 

I am writing a kernel module and I wanted to know which data structure backs up the /proc/self or how do I get the process id of my call and number of it's threads from within the kernel? 

Thanks, 
Suren. 
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/proc question

[Philipp Ittershagen]

Hello Surenkumar,

On Wed, Feb 8, 2012 at 8:54 AM, Surenkumar Nihalani <suren@gatech.edu> wrote:
> Hello All,
>
> I am writing a kernel module and I wanted to know which data structure backs
> up the /proc/self or how do I get the process id of my call and number of
> it's threads from within the kernel?


You can get the process id of the current context using the directive
"current->pid". The macro "current" refers to the current task struct,
so it should also be possible to get the number of threads.


Philipp