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[Qemu-devel] [PATCH] qemu-ga-win: Fail loudly on bare 'set-time'
From: |
Michal Privoznik |
Subject: |
[Qemu-devel] [PATCH] qemu-ga-win: Fail loudly on bare 'set-time' |
Date: |
Wed, 21 Jan 2015 12:09:50 +0100 |
The command is not implemented correctly yet. The documentation allows
to not pass any value to set, in which case the time is re-read from
RTC. However, reading CMOS on Windows is not trivial to implement. So
instead of pretending we've set the correct time, fail explicitly.
Signed-off-by: Michal Privoznik <address@hidden>
---
qga/commands-win32.c | 44 ++++++++++++++++++++++----------------------
qga/qapi-schema.json | 5 ++++-
2 files changed, 26 insertions(+), 23 deletions(-)
diff --git a/qga/commands-win32.c b/qga/commands-win32.c
index 3bcbeae..4fe45f0 100644
--- a/qga/commands-win32.c
+++ b/qga/commands-win32.c
@@ -395,31 +395,31 @@ void qmp_guest_set_time(bool has_time, int64_t time_ns,
Error **errp)
FILETIME tf;
LONGLONG time;
- if (has_time) {
- /* Okay, user passed a time to set. Validate it. */
- if (time_ns < 0 || time_ns / 100 > INT64_MAX - W32_FT_OFFSET) {
- error_setg(errp, "Time %" PRId64 "is invalid", time_ns);
- return;
- }
+ if (!has_time) {
+ /* Unfortunately, Windows libraries don't provide an easy way to access
+ * RTC yet:
+ *
+ * https://msdn.microsoft.com/en-us/library/aa908981.aspx
+ */
+ error_setg(errp, "Time argument is required on this platform");
+ return;
+ }
- time = time_ns / 100 + W32_FT_OFFSET;
+ /* Validate time passed by user. */
+ if (time_ns < 0 || time_ns / 100 > INT64_MAX - W32_FT_OFFSET) {
+ error_setg(errp, "Time %" PRId64 "is invalid", time_ns);
+ return;
+ }
- tf.dwLowDateTime = (DWORD) time;
- tf.dwHighDateTime = (DWORD) (time >> 32);
+ time = time_ns / 100 + W32_FT_OFFSET;
- if (!FileTimeToSystemTime(&tf, &ts)) {
- error_setg(errp, "Failed to convert system time %d",
- (int)GetLastError());
- return;
- }
- } else {
- /* Otherwise read the time from RTC which contains the correct value.
- * Hopefully. */
- GetSystemTime(&ts);
- if (ts.wYear < 1601 || ts.wYear > 30827) {
- error_setg(errp, "Failed to get time");
- return;
- }
+ 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, &local_err);
diff --git a/qga/qapi-schema.json b/qga/qapi-schema.json
index 376e79f..ce73dd3 100644
--- a/qga/qapi-schema.json
+++ b/qga/qapi-schema.json
@@ -121,7 +121,10 @@
# given value, then sets the Hardware Clock (RTC) to the
# current System Time. This will make it easier for a guest
# to resynchronize without waiting for NTP. If no @time is
-# specified, then the time to set is read from RTC.
+# specified, then the time to set is read from RTC. However,
+# this may not be supported on all platforms (i.e. Windows).
+# If that's the case users are advised to always pass a
+# value.
#
# @time: #optional time of nanoseconds, relative to the Epoch
# of 1970-01-01 in UTC.
--
2.0.5
- [Qemu-devel] [PATCH] qemu-ga-win: Fail loudly on bare 'set-time',
Michal Privoznik <=