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List:       linux-ha-dev
Subject:    Re: [Linux-ha-dev] High-Availability Linux (linux-ha) news for Oc tober
From:       Horms <horms () verge ! net ! au>
Date:       2002-07-28 14:48:12
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On Thu, Oct 25, 2001 at 02:34:48PM +0100, David Lee wrote:
> On Thu, 25 Oct 2001, Soffen, Matthew wrote:
> 
> > NOTE: The Process Status stuff doesn't appear to be working under Solaris.
> 
> Presumably by that you mean the "nice fix for ... ps" below...
> 
> > -----Original Message-----
> > [...]
> > Here's a summary of what we've accomplished in October 2001 in the Linux-HA
> > arena:
> > 
> > [snip]
> > 	Nice fix for displaying which process is doing what in 'ps'
> 
> I can't quote chapter and verse, but I'm reasonably sure that Solaris 2.x
> doesn't have this capability.  
> 
> If so, I'd also be reasonably sure that this is a conscious decision,
> because it was definitely there in the older, 1.x (a.k.a. the SunOS 4
> series).  When, all those years ago, Sun moved from BSD-based SunOS 4 to
> SYSV-based SunOS 5, they made strenuous efforts to ensure backwards
> compatibility for legacy operation (including, for instance, a version of
> "scandir" for old binaries).  Hence my thinking that it is deliberate
> rather than oversight.
> 
> (Indeed, I recall noticing this very item ("ps" display) many years ago
> when we moved our main "sendmail" from SunOS 4 to SunOS 5 ...)
> 
> If I happen to stumble across chapter-and-verse, I'll try to remember to
> let you know.

Just to throw my 2c worth into this conversation.

I believe that Solaris has (at least) two versions of the ps
command. One (which is probably in /usr/bin) which does not honour
any changes a process makes to its procinfo and one (which is probably
in /usr/ucb/bin) which does when given the right arguments.

I believe that this is considered to be a security measure
as it stops processes from hiding themselves. Amusingly you 
can do this anyway by writing a simple wrapper that execs
the desired binary. Ahh, university days... I digress.

-- 
Horms
        
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