Everhart, Glenn
From:	Oren Teich [teich@gwha.com]
Sent:	Tuesday, October 13, 1998 1:52 PM
To:	Bhaduri, Arnab; ntdev@atria.com
Subject:	RE: [ntdev] finding child process id
This is a good solution.  The exec()'d process is usually around for man
minutes if not an hour or more.  Now the only problem is,
NtQueryInformationProcess isn't on MSDN online, nor does VC++ 5.0 seem to
know anything about it.  Where can I find this function?

Thanks,
Oren

> -----Original Message-----
> From: Bhaduri, Arnab [mailto:Arnab_Bhaduri@cisnc.canon.com]
> Sent: Tuesday, October 13, 1998 11:38 AM
> To: ntdev@atria.com; 'Oren Teich'
> Subject: RE: [ntdev] finding child process id
>
>
>
> <Oren Teich wrote>
> > there is a C program that calls CreateProcess to start a Perl script.
> > This
> > perl script then in turn exec's something else.  Now the
> problem arises in
> > that Win32 Perl exec seems to not actually exec, as there is no
> such thing
> > in windows I guess, but rather to create a new process, and exit.  The
> > only
> > problem with this is that now I no longer have the PID of the
> newly exec'd
> > process.  I don't know it's name, I don't really know what time
> it started
> > at, I don't really know anything about it.
> > In unix, I could open the process table immediately after the exec from
> > the
> > parent, and find out who my child is, and that would be the process I'm
> > looking for.  Is there any way to do something similar in NT, or does
> > anyone
> > have any recommendations as to the NT way of doing this?
> >
> I presume you want to know the PID of the "exec'ed" process.
> You can walk the process list and check the parent PID
> against the PID of the Perl script, but be warned that this
> is both cumbersome and expensive. NtQueryInformationProcess()
> will give you the "parent" PID of any process. You will need
> to walk the process list, call this function for each process,
> and match the parent PID against the PID of the Perl script.
> While all this is going on, your exec'ed process might do its
> job and exit, in which case...
>
> Perhaps you could explain a bit more about what exactly you
> need to know about the exec'ed process.
>
> Regards
> Arnab
>

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