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Re: 1.3.3-2: ps.exe bug for processes with a zero ppid
- To: cygwin at cygwin dot com
- Subject: Re: 1.3.3-2: ps.exe bug for processes with a zero ppid
- From: Christopher Faylor <cgf at redhat dot com>
- Date: Wed, 3 Oct 2001 11:11:16 -0400
- Cc: robert_legros at yahoo dot com
- References: <20011003125358.52168.qmail@web11501.mail.yahoo.com>
- Reply-To: cygwin at cygwin dot com
On Wed, Oct 03, 2001 at 05:53:58AM -0700, Robert Legros wrote:
>There is a follow up to the bug "1.3.3-2: Process creation is possible
>with ppid = 0 and pgid = 0"
><http://cygwin.com/ml/cygwin/2001-10/msg00109.html>.
>
>'ps.exe' does not behave correctly with such processes. This is due to
>the fact that in the code, there is a criteria to see if a process is a
>Cygwin one or a Windows one. And that criteria is precisely (p-ppid !=
>0) !.
>
>I have written a patch for 'ps.exe'. It is more a hack than a real bug
>correction, but it works. In fact the real bug correction must be done
>somewhere in the process creation routines inside 'cygwin1.dll'. This
>patch is to be found in attachment.
You've hit the nail on the head. This is a hack. If the linux kernel
started setting pgids to 0, you would fix the linux kernel. You wouldn't
fix 'ps'.
If ps is assuming that a pgid == 0 is not a cygwin process then obviously
something is screwed up somewhere. So, the fix is in cygwin1.dll not
ps.
cgf
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