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From: David Xu <davidxu@FreeBSD.org>
Date: Wed, 27 Oct 2010 02:32:54 +0000 (UTC)
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Subject: svn commit: r214409 - head/sys/kern
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Author: davidxu
Date: Wed Oct 27 02:32:54 2010
New Revision: 214409
URL: http://svn.freebsd.org/changeset/base/214409

Log:
  If input parameter cpusetsize is zero, give userland size of cpuset mask
  kernel is using.

Modified:
  head/sys/kern/kern_cpuset.c

Modified: head/sys/kern/kern_cpuset.c
==============================================================================
--- head/sys/kern/kern_cpuset.c	Wed Oct 27 02:07:25 2010	(r214408)
+++ head/sys/kern/kern_cpuset.c	Wed Oct 27 02:32:54 2010	(r214409)
@@ -889,6 +889,10 @@ cpuset_getaffinity(struct thread *td, st
 	int error;
 	size_t size;
 
+	if (uap->cpusetsize == 0) {
+		td->td_retval[0] = sizeof(cpuset_t);
+		return (0);
+	}
 	if (uap->cpusetsize < sizeof(cpuset_t) ||
 	    uap->cpusetsize > CPU_MAXSIZE / NBBY)
 		return (ERANGE);