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[Qemu-devel] [PATCH 1/5] qga: add windows implementation for guest-get-t
From: |
Michael Roth |
Subject: |
[Qemu-devel] [PATCH 1/5] qga: add windows implementation for guest-get-time |
Date: |
Tue, 2 Apr 2013 09:13:09 -0500 |
From: Lei Li <address@hidden>
Signed-off-by: Lei Li <address@hidden>
Reviewed-by: Eric Blake <address@hidden>
Reviewed-by: Michael Roth <address@hidden>
Signed-off-by: Michael Roth <address@hidden>
---
qga/commands-win32.c | 27 +++++++++++++++++++++++++--
1 file changed, 25 insertions(+), 2 deletions(-)
diff --git a/qga/commands-win32.c b/qga/commands-win32.c
index b19be9d..d98e3ee 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;
@@ -280,8 +286,25 @@ GuestNetworkInterfaceList
*qmp_guest_network_get_interfaces(Error **err)
int64_t qmp_guest_get_time(Error **errp)
{
- error_set(errp, QERR_UNSUPPORTED);
- return -1;
+ SYSTEMTIME ts = {0};
+ int64_t time_ns;
+ FILETIME tf;
+
+ GetSystemTime(&ts);
+ if (ts.wYear < 1601 || ts.wYear > 30827) {
+ error_setg(errp, "Failed to get time");
+ return -1;
+ }
+
+ if (!SystemTimeToFileTime(&ts, &tf)) {
+ error_setg(errp, "Failed to convert system time: %d",
(int)GetLastError());
+ return -1;
+ }
+
+ time_ns = ((((int64_t)tf.dwHighDateTime << 32) | tf.dwLowDateTime)
+ - W32_FT_OFFSET) * 100;
+
+ return time_ns;
}
void qmp_guest_set_time(int64_t time_ns, Error **errp)
--
1.7.9.5