RE: rusage data for another process?
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
Title: RE: rusage data for another process?
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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