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RE: FC5 system() call



Brian D. McGrew { brian visionpro com || brian doubledimension com }
> This is a test.  This is only a test!
  Had this been an actual emergency, you would have been
  told to cancel this test and seek professional assistance!

-----Original Message-----
From: fedora-list-bounces redhat com
[mailto:fedora-list-bounces redhat com] On Behalf Of Jakub Jelinek
Sent: Friday, September 22, 2006 8:49 AM
To: For users of Fedora Core releases
Subject: Re: FC5 system() call

On Fri, Sep 22, 2006 at 08:38:39AM -0700, Brian D. McGrew wrote:
> Even assuming you mean 
> int num_proc = system("cat /proc/cpuinfo | grep -c processor >>
> /dev/null 2>&1");
> I dont see how this will give you the # of cpus.
> num-proc will only contain the status of the system call, not the
> of the grep, wont it?
> -----
> You're right, it's giving me the return value from grep, which is 0.
> need the string printed by grep ... How can I get this???

You'd need to use popen/fgets/strtol/pclose.  But, to get number of
CPUs you really should be using sysconf (_SC_NPROCESSORS_ONLN), which
is portable and unlike the grep does the right thing.


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