From e7c5d8925fd691a0f316ef14468d469ce0546e9d Mon Sep 17 00:00:00 2001
From: "[CST] Focus" <focus.cst@gmail.com>
Date: Mon, 5 Mar 2012 19:59:39 +0400
Subject: [PATCH] driver/abstime.c: add time_monotonic_us

---
 src/driver/abstime.c | 12 ++++++++++++
 src/driver/abstime.h |  3 +++
 2 files changed, 15 insertions(+)

diff --git a/src/driver/abstime.c b/src/driver/abstime.c
index c2af8d4f7..af7c1c7fc 100644
--- a/src/driver/abstime.c
+++ b/src/driver/abstime.c
@@ -1,3 +1,4 @@
+#include <stdint.h>
 #include <stdio.h> /* for perror */
 #include <time.h>
 
@@ -27,3 +28,14 @@ time_t time_monotonic(void)
 	   time comparisons if the uptime is low, so add 7 days */
 	return t.tv_sec + 604800;
 }
+
+uint64_t time_monotonic_us(void)
+{
+	struct timespec t;
+	if (clock_gettime(CLOCK_MONOTONIC, &t))
+	{
+		perror("time_monotonic_us clock_gettime");
+		return -1;
+	}
+	return ((int64_t)t.tv_sec + (uint64_t)604800) * (uint64_t) 1000000 + (uint64_t) t.tv_nsec / (uint64_t)1000;
+}
diff --git a/src/driver/abstime.h b/src/driver/abstime.h
index bbd000993..b530755b6 100644
--- a/src/driver/abstime.h
+++ b/src/driver/abstime.h
@@ -1,3 +1,5 @@
+#include <stdint.h>
+
 #ifndef _ABS_TIME_H_
 #define _ABS_TIME_H_
 #ifdef __cplusplus
@@ -6,6 +8,7 @@ extern "C"
 #endif
 extern time_t time_monotonic_ms(void);
 extern time_t time_monotonic(void);
+uint64_t time_monotonic_us(void);
 #ifdef __cplusplus
 }
 #endif