utils: use clock_get_time() for clock_gettime() on Apple.

It turns out that mach_absolute_time() is not monotonic at all.  While
at it, convert the CLOCK_REALTIME implementation to using
clock_get_time() as well.

Signed-off-by: Yousong Zhou <yszhou4tech@gmail.com>

1 files changed, 8 insertions, 3 deletions

diff --git a/utils.h b/utils.h
index 9688a6a..7ef82c6 100644
--- a/utils.h
+++ b/utils.h
@@ -58,10 +58,11 @@ extern int __BUILD_BUG_ON_CONDITION_FAILED;
 
 #ifdef __APPLE__
 
-#define CLOCK_REALTIME	0
-#define CLOCK_MONOTONIC	1
+#include <mach/clock_types.h>
+#define CLOCK_REALTIME	CALENDAR_CLOCK
+#define CLOCK_MONOTONIC	SYSTEM_CLOCK
 
-void clock_gettime(int type, struct timespec *tv);
+int clock_gettime(int type, struct timespec *tv);
 
 #endif
 
@@ -159,6 +160,10 @@ static inline uint16_t __u_bswap16(uint16_t val)
 #define __constructor __attribute__((constructor))
 #endif
 
+#ifndef __destructor
+#define __destructor __attribute__((destructor))
+#endif
+
 #ifndef __hidden
 #define __hidden __attribute__((visibility("hidden")))
 #endif