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Date: Tue, 04 Mar 2008 10:09:13 +0800
From: David Xu <davidxu@FreeBSD.org>
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To: Jeff Roberson <jroberson@chesapeake.net>
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Cc: cvs-src@FreeBSD.org, Jeff Roberson <jeff@FreeBSD.org>,
	src-committers@FreeBSD.org, cvs-all@FreeBSD.org
Subject: Re: cvs commit: src/sys/kern init_sysent.c syscalls.c
 systrace_args.c src/sys/sys syscall.h syscall.mk sysproto.h
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Jeff Roberson wrote:

>> One question is how I can determine the size of cpuset the kernel is
>> using ?
> 
> I wrote it to tolerate user masks that were much larger than the kernel 
> mask.  I set the default CPU_SETSIZE in userspace to 128 and in kernel 
> it's MAXCPU.  So in practice an application shouldn't have to redefine 
> CPU_SETSIZE.  If your set is too small the kernel will return ERANGE 
> however.  Unfortunately, if your set is larger than the kernel's 
> CPU_MAXSIZE it'll also return ERANGE.  Maybe I should use different 
> errnos for those cases.
>

 From my point, userland has to write some urgly code to guess what
kernel code wants, it is rather frustrate.