Patchwork [2/2] qga: add windows implementation for guest-set-time

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Submitter Lei Li
Date March 15, 2013, 9:29 a.m.
Message ID <1363339745-15639-3-git-send-email-lilei@linux.vnet.ibm.com>
Download mbox | patch
Permalink /patch/227909/
State New
Headers show

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Lei Li - March 15, 2013, 9:29 a.m.
Signed-off-by: Lei Li <lilei@linux.vnet.ibm.com>
---
 qga/commands-win32.c | 29 ++++++++++++++++++++++++++++-
 1 file changed, 28 insertions(+), 1 deletion(-)

Patch

diff --git a/qga/commands-win32.c b/qga/commands-win32.c
index d98e3ee..24e4ad0 100644
--- a/qga/commands-win32.c
+++ b/qga/commands-win32.c
@@ -309,7 +309,34 @@  int64_t qmp_guest_get_time(Error **errp)
 
 void qmp_guest_set_time(int64_t time_ns, Error **errp)
 {
-    error_set(errp, QERR_UNSUPPORTED);
+    SYSTEMTIME ts;
+    FILETIME tf;
+    LONGLONG time;
+
+    if (time_ns < 0 || time_ns / 100 > INT64_MAX - W32_FT_OFFSET) {
+        error_setg(errp, "Time %" PRId64 "is invalid", time_ns);
+        return;
+    }
+
+    time = time_ns / 100 + W32_FT_OFFSET;
+
+    tf.dwLowDateTime = (DWORD) time;
+    tf.dwHighDateTime = (DWORD) (time >> 32);
+
+    if (!FileTimeToSystemTime(&tf, &ts)) {
+        error_setg(errp, "Failed to convert system time %d", (int)GetLastError());
+        return;
+    }
+
+    acquire_privilege(SE_SYSTEMTIME_NAME, errp);
+    if (error_is_set(errp)) {
+        return;
+    }
+
+    if (!SetSystemTime(&ts)) {
+        error_setg(errp, "Failed to set time to guest: %d", (int)GetLastError());
+        return;
+    }
 }
 
 GuestLogicalProcessorList *qmp_guest_get_vcpus(Error **errp)