[Xen-devel] [PATCH v2 3/7] add gettimeofday function to time managment

[Paul Semel <semelpaul@xxxxxxxxx>]

From: Paul Semel <phentex@xxxxxxxxx>

Signed-off-by: Paul Semel <phentex@xxxxxxxxx>
---
 common/time.c      | 23 +++++++++++++++++++++++
 include/xtf/time.h |  7 +++++++
 2 files changed, 30 insertions(+)

diff --git a/common/time.c b/common/time.c
index 3e8e8ce..1f0f289 100644
--- a/common/time.c
+++ b/common/time.c
@@ -87,6 +87,29 @@ uint64_t current_time(void)
     return seconds + boot_time;
 }
 
+/* The POSIX gettimeofday syscall normally takes a second argument, which is
+ * the timezone (struct timezone). However, it sould be NULL because linux
+ * doesn't use it anymore. So we need for us to add it in this function
+ */
+int gettimeofday(struct timeval *tp)
+{
+    uint64_t boot_time = since_boot_time();
+    uint32_t mod;
+
+#if defined(__i386__)
+    mod = divmod64(&boot_time, 1000000000);
+#else
+    mod = boot_time % 1000000000;
+#endif
+
+    if (!tp)
+        return -1;
+
+    tp->sec = current_time();
+    tp->nsec = ACCESS_ONCE(shared_info.wc_nsec) + mod;
+    return 0;
+}
+
 /*
  * Local variables:
  * mode: C
diff --git a/include/xtf/time.h b/include/xtf/time.h
index 6195b24..2ff8f42 100644
--- a/include/xtf/time.h
+++ b/include/xtf/time.h
@@ -8,6 +8,11 @@
 
 #include <xtf/types.h>
 
+struct timeval {
+    uint64_t sec;
+    uint64_t nsec;
+};
+
 #define rdtscp(tsc) {\
     uint32_t lo, hi;\
     __asm__ volatile("rdtsc": "=a"(lo), "=d"(hi));\
@@ -20,6 +25,8 @@ uint64_t since_boot_time(void);
 
 uint64_t current_time(void);
 
+int gettimeofday(struct timeval *tp);
+
 #endif /* XTF_TIME_H */
 
 /*
-- 
2.16.1


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