Re: [uml-devel] sysconf(_SC_NPROCESSORS_CONF) returning zero

[Ingo van Lil <inguin@gmx.de>]

Jeff Dike schrieb:

>> Hmmm... so I have cpu0 similar to yours. What version
>> of UML and libc do you have?
> 
> UML 2.6.26 and an older libc:
> 
> % ls -l /lib/libc.so.6
> lrwxrwxrwx 1 root root 11 Jun  2  2007 /lib/libc.so.6 -> libc-2.5.so
> 
> Looking through libc at
> 
> http://www.google.com/codesearch?hl=en&q=file:\.c%24+\"/stat\"+package:http://su-se.lunar-linux.org/lunar/mirrors/glibc-2.3.3-cvs-20040708.tar.bz2+show:m1O9RV1wlw4:qbkros5194A:MbxD3_8dUHU&sa=N&cd=1&ct=rc&cs_p=http://su-se.lunar-linux.org/lunar/mirrors/glibc-2.3.3-cvs-20040708.tar.bz2&cs_f=glibc-2.3.3-cvs-20040708/sysdeps/unix/sysv/linux/getsysstats.c
> 
> I see it counting cpu<n> lines in /proc/stat, which is what I'm
> seeing.  It will also look at /proc/cpuinfo.  Can you strace your
> version and see if it's looking there at all?

More recent versions of glibc (here: 2.8 on Fedora 9) seem to look at 
the contents of /sys/devices/system/cpu instead. That directory is empty 
in UML, which might explain the odd result from Stanislav's program.

Cheers,
Ingo

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