From b4415dd4b897dc69167d4a2fd0d7eba78eee1693 Mon Sep 17 00:00:00 2001
From: Rinigus <rinigus.git@gmail.com>
Date: Tue, 5 Jul 2016 22:57:11 +0300
Subject: [PATCH] adding configure check for clock boottime and monotonic

---
 configure.ac | 23 ++++++++++++++++++++++-
 1 file changed, 22 insertions(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index 2a4d98d2..8be837f9 100644
--- a/configure.ac
+++ b/configure.ac
@@ -735,6 +735,23 @@ AC_CHECK_HEADERS(net/pfvar.h,
 have_termios_h="no"
 AC_CHECK_HEADERS(termios.h, [have_termios_h="yes"])
 
+# For cpusleep plugin
+AC_CACHE_CHECK([whether clock_boottime and clock_monotonic are supported],
+		       [c_cv_have_clock_boottime_monotonic],
+		       AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
+[[[
+#include <time.h>
+]]],
+[[[
+ struct timespec b, m;
+ clock_gettime(CLOCK_BOOTTIME, &b );
+ clock_gettime(CLOCK_MONOTONIC, &m );
+]]]
+		       )],
+		       [c_cv_have_clock_boottime_monotonic="yes"],
+		       [c_cv_have_clock_boottime_monotonic="no"]))
+
+
 # For the turbostat plugin
 have_asm_msrindex_h="no"
 AC_CHECK_HEADERS(asm/msr-index.h, [have_asm_msrindex_h="yes"])
@@ -5491,7 +5508,6 @@ then
 	plugin_contextswitch="yes"
 	plugin_cpu="yes"
 	plugin_cpufreq="yes"
-	plugin_cpusleep="yes"
 	plugin_disk="yes"
 	plugin_drbd="yes"
 	plugin_entropy="yes"
@@ -5525,6 +5541,11 @@ then
 	then
 		plugin_turbostat="yes"
 	fi
+	
+	if test "x$c_cv_have_clock_boottime_monotonic" = "xyes"
+	then
+		plugin_cpusleep="yes"
+	fi
 fi
 
 if test "x$ac_system" = "xOpenBSD"
-- 
2.11.0