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Date: Wed, 21 Jun 2006 08:58:32 +0200
From: "Alex Riesen" <raa.lkml@gmail.com>
To: "Arijit Das" <Arijit.Das@synopsys.com>
Subject: Re: Getting CPU Usage of a running child process
Cc: linux-kernel@vger.kernel.org
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On 3/2/06, Arijit Das <Arijit.Das@synopsys.com> wrote:
> The times() function gets me the system/user CPU usage of me (invoking
> process) and all my terminated/waited children.
>
> Is there any User Space API/way for me (a process) to get the
> system/user CPU usage of one of my currently running child process? Am
> looking for a portable solution...not sure if there is any

There is a way to get the times for all children:
getrusage(RUSAGE_CHILDREN, &usage);
You can double-fork to get the info for a specific subprocess.
/proc is, as you probably noticed, not portable.