qga: replace qemu_gettimeofday() with g_get_real_time()

GLib g_get_real_time() is an alternative to gettimeofday() which allows
to simplify our code.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Message-Id: <20220307070401.171986-4-marcandre.lureau@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

qga/commands-posix.c

@@ -136,20 +136,6 @@ void qmp_guest_shutdown(bool has_mode, const char *mode, Error **errp)
     /* succeeded */
 }
 
-int64_t qmp_guest_get_time(Error **errp)
-{
-   int ret;
-   qemu_timeval tq;
-
-   ret = qemu_gettimeofday(&tq);
-   if (ret < 0) {
-       error_setg_errno(errp, errno, "Failed to get time");
-       return -1;
-   }
-
-   return tq.tv_sec * 1000000000LL + tq.tv_usec * 1000;
-}
-
 void qmp_guest_set_time(bool has_time, int64_t time_ns, Error **errp)
 {
     int ret;

qga/commands-win32.c

@@ -1751,25 +1751,6 @@ static int64_t filetime_to_ns(const FILETIME *tf)
             - W32_FT_OFFSET) * 100;
 }
 
-int64_t qmp_guest_get_time(Error **errp)
-{
-    SYSTEMTIME ts = {0};
-    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;
-    }
-
-    return filetime_to_ns(&tf);
-}
-
 void qmp_guest_set_time(bool has_time, int64_t time_ns, Error **errp)
 {
     Error *local_err = NULL;

qga/commands.c

@@ -585,3 +585,8 @@ GuestFileRead *qmp_guest_file_read(int64_t handle, bool has_count,
 
     return read_data;
 }
+
+int64_t qmp_guest_get_time(Error **errp)
+{
+    return g_get_real_time() * 1000;
+}