wait for childs of a child process

wait for childs of a child process

[Gauvain Pocentek]

Hello,

I have to monitor applications on a system (users who run the application, how
long, etc.), but I'm having troubles with applications which fork during startup
(openoffice for instance).

Here is a snippet of what I planned to use (checks omitted to simplify):

####################################
#include <stdio.h>
#include <sys/wait.h>
#include <sys/types.h>

int main()
{
    int status;
    pid_t p = fork();
    if (p == 0)
        system ("soffice");
    else if (p > 0)
    {
        waitpid (p, &status, 0);
        printf ("done\n");
    }

    return 0;
}

####################################

Is there a way to make wait() or an other syscall monitor the process' children,
or is patching openoffice (and other apps behaving in the same way) the only
solution?

Thanks,
Gauvain Pocentek

Re: wait for childs of a child process

[Michael Iatrou]

When the date was Monday 09 February 2009, Gauvain Pocentek wrote:

> I have to monitor applications on a system (users who run the
> application, how long, etc.), but I'm having troubles with applications
> which fork during startup (openoffice for instance).

Are you sure that the process accounting on Linux doesn't cover your needs 
and you need a custom solution?

-- 
 Michael Iatrou (brzh)

Re: wait for childs of a child process

[ben]

Gauvain Pocentek a écrit :
> Hello,
> 
> I have to monitor applications on a system (users who run the application, how
> long, etc.), but I'm having troubles with applications which fork during startup
> (openoffice for instance).
> 
> Here is a snippet of what I planned to use (checks omitted to simplify):
> 
> ####################################
> #include <stdio.h>
> #include <sys/wait.h>
> #include <sys/types.h>
> 
> int main()
> {
>     int status;
>     pid_t p = fork();
>     if (p == 0)
>         system ("soffice");
>     else if (p > 0)
>     {
>         waitpid (p, &status, 0);
>         printf ("done\n");
>     }
> 
>     return 0;
> }
> 
> ####################################
> 
> Is there a way to make wait() or an other syscall monitor the process' children,
> or is patching openoffice (and other apps behaving in the same way) the only
> solution?
> 
> Thanks,
> Gauvain Pocentek

Would not be simpler to use Unix's pacct feature ?
It may not be enabled, though, on some linux distro.

- ben
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Re: wait for childs of a child process

[Gauvain Pocentek]

Michael Iatrou wrote:
> When the date was Monday 09 February 2009, Gauvain Pocentek wrote:
> 
>> I have to monitor applications on a system (users who run the
>> application, how long, etc.), but I'm having troubles with applications
>> which fork during startup (openoffice for instance).
> 
> Are you sure that the process accounting on Linux doesn't cover your needs 
> and you need a custom solution?

Well I wasn't aware that such tool existed. It will probably help to use this
instead of reinventing the wheel.

Thanks to you and ben (who had the same idea).

Gauvain

NB: sorry for the typo in the subject.