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[Qemu-devel] [PATCH 1/2] qga: add windows implementation for guest-get-t


From: Lei Li
Subject: [Qemu-devel] [PATCH 1/2] qga: add windows implementation for guest-get-time
Date: Thu, 14 Mar 2013 15:07:50 +0800

Signed-off-by: Lei Li <address@hidden>
---
 qga/commands-win32.c | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/qga/commands-win32.c b/qga/commands-win32.c
index 7e8ecb3..e24fb4a 100644
--- a/qga/commands-win32.c
+++ b/qga/commands-win32.c
@@ -22,6 +22,12 @@
 #define SHTDN_REASON_FLAG_PLANNED 0x80000000
 #endif
 
+/* multiple of 100 nanoseconds elapsed between windows baseline
+   (1/1/1601) and Unix Epoch (1/1/1970), accounting for leap years */
+#define W32_FT_OFFSET (10000000ULL * 60 * 60 * 24 * \
+                       (365 * (1970 - 1601) +       \
+                        (1970 - 1601) / 4 - 3))
+
 static void acquire_privilege(const char *name, Error **err)
 {
     HANDLE token;
@@ -108,6 +114,33 @@ void qmp_guest_shutdown(bool has_mode, const char *mode, 
Error **err)
     }
 }
 
+int64_t qmp_guest_get_time(Error **errp)
+{
+    SYSTEMTIME *ts = g_malloc0(sizeof(SYSTEMTIME));
+    int64_t time_ns;
+    FILETIME tf;
+
+    GetSystemTime(ts);
+    if (!ts) {
+        error_setg(errp, "Failed to get time");
+        goto out;
+    }
+
+    if (!SystemTimeToFileTime(ts, &tf)) {
+        error_setg_errno(errp, errno, "Failed to convert system time");
+        goto out;
+    }
+
+    time_ns = ((((int64_t)tf.dwHighDateTime << 32) | tf.dwLowDateTime)
+                - W32_FT_OFFSET) * 100;
+
+    return time_ns;
+
+out:
+    g_free(ts);
+    return -1;
+}
+
 int64_t qmp_guest_file_open(const char *path, bool has_mode, const char *mode, 
Error **err)
 {
     error_set(err, QERR_UNSUPPORTED);
-- 
1.7.11.7




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