Re: [Qemu-devel] [PATCH 2/2] qga: add windows implementation for guest-set-time

[mdroth <mdroth@linux.vnet.ibm.com>]

On Wed, Mar 13, 2013 at 06:10:31PM +0800, lilei@linux.vnet.ibm.com wrote:
> From: Lei Li <lilei@linux.vnet.ibm.com>
> 
> Signed-off-by: Lei Li <lilei@linux.vnet.ibm.com>
> ---
>  qga/commands-win32.c |   34 ++++++++++++++++++++++++++++++++++
>  1 files changed, 34 insertions(+), 0 deletions(-)
> 
> diff --git a/qga/commands-win32.c b/qga/commands-win32.c
> index 0a2bb34..a0c8d43 100644
> --- a/qga/commands-win32.c
> +++ b/qga/commands-win32.c
> @@ -140,6 +140,40 @@ int64_t qmp_guest_get_time(Error **errp)
>     return time_ns;
>  }
> 
> +void qmp_guest_set_time(int64_t time_ns, Error **errp)
> +{
> +    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");
> +        return;
> +    }
> +
> +    acquire_privilege(SE_SYSTEMTIME_NAME, errp);
> +    if (error_is_set(errp)) {
> +        error_setg(errp, "Failed to acquire privilege");
> +        return;
> +    }
> +
> +    if (!SetSystemTime(&ts)) {
> +        slog("guest-set-time failed: %d", GetLastError());
> +        error_setg_errno(errp, errno, "Failed to set time to guest");

I think we want to pass back GetLastError(), SetSystemTime doesn't set errno
(and if it did something in the slog() callchain probably would've
clobbered it)

Looks good otherwise.

> +        return;
> +    }
> +}
> +
>  int64_t qmp_guest_file_open(const char *path, bool has_mode, const char *mode, Error **err)
>  {
>      error_set(err, QERR_UNSUPPORTED);
> -- 
> 1.7.7.6
>