RE: rusage data for another process?

• Subject: RE: rusage data for another process?
• From: Norm Green <email@hidden>
• Date: Tue, 11 Dec 2007 06:22:39 -0800
• Delivered-to: email@hidden
• Delivered-to: email@hidden

I'm porting an application to Darwin that currently runs on Solaris, HPUX, AIX and Linux.  Getting the process data by calling "ps" or by accessing the low-level and unstable interfaces are my least preferred options. 

It would be nice if Darwin had a stable API for getting performance data of another process without disturbing that other process, just as these other UNIX systems do.

Norm Green

-----Original Message-----
From: Finlay Dobbie [mailto:email@hidden]
Sent: Tuesday, December 11, 2007 5:20 AM
To: Terry Lambert
Cc: email@hidden
Subject: Re: rusage data for another process?

On Dec 10, 2007 11:33 PM, Terry Lambert <email@hidden> wrote:
> On Dec 10, 2007, at 3:14 PM, Steve Thompson wrote:
> > On Sun, 9 Dec 2007, Norm Green wrote:
> >> Is there a way to get the data returned by getrusage() for another
> >> process?
> >
> > I also need this functionality, as least insofar as the CPU usage
> > fields are concerned.
>
> Generally, there is no way to get this information for another
> process, unless it's your child process, and it has terminated, or
> unless it is for yourself.
>
> The most correct approach is to ask the other process to make the
> call, and then tell you, simce time is not really accounted for all
> your threads until you make the call (the BSD getrusage() output is
> more or less synthetic).

If you're absolutely desperate, you could either:

1. parse the output of ps
2. use the same approach that ps does (fiddling with the relevant
mach_tasks, look at the adv_cmds project)

Of course, both of these are fragile and subject to breakage at any
point in the future.

 -- Finlay
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