From d4c1a42e53ebc1cf06858005a608e33c0bcc2200 Mon Sep 17 00:00:00 2001
From: kib <kib@FreeBSD.org>
Date: Wed, 27 Jun 2012 20:32:45 +0000
Subject: Optimize the handling of SC_NPROCESSORS_CONF, by using auxv AT_NCPU
 value if present.

MFC after:	1 week
---
 lib/libc/gen/sysconf.c | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'lib')

diff --git a/lib/libc/gen/sysconf.c b/lib/libc/gen/sysconf.c
index 80ae626..2d117b7 100644
--- a/lib/libc/gen/sysconf.c
+++ b/lib/libc/gen/sysconf.c
@@ -42,6 +42,7 @@ __FBSDID("$FreeBSD$");
 #include <sys/resource.h>
 #include <sys/socket.h>
 
+#include <elf.h>
 #include <errno.h>
 #include <limits.h>
 #include <paths.h>
@@ -51,6 +52,7 @@ __FBSDID("$FreeBSD$");
 
 #include "../stdlib/atexit.h"
 #include "tzfile.h"		/* from ../../../contrib/tzcode/stdtime */
+#include "libc_private.h"
 
 #define	_PATH_ZONEINFO	TZDIR	/* from tzfile.h */
 
@@ -585,6 +587,8 @@ yesno:
 
 	case _SC_NPROCESSORS_CONF:
 	case _SC_NPROCESSORS_ONLN:
+		if (_elf_aux_info(AT_NCPUS, &value, sizeof(value)) == 0)
+			return ((long)value);
 		mib[0] = CTL_HW;
 		mib[1] = HW_NCPU;
 		break;
-- 
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