diff options
| -rw-r--r-- | qga/commands-win32.c | 27 |
1 files changed, 25 insertions, 2 deletions
diff --git a/qga/commands-win32.c b/qga/commands-win32.c index b19be9db48..d98e3eeff0 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) |