Re: [PATCH] migration: Remove time_t cast for OpenBSD

["Daniel P. Berrangé" <berrange@redhat.com>]

On Wed, Mar 31, 2021 at 03:26:16PM -0400, Brad Smith wrote:
> On 3/13/2021 6:33 PM, Brad Smith wrote:
> > On 3/11/2021 1:39 PM, Daniel P. Berrangé wrote:
> > > On Thu, Mar 11, 2021 at 06:28:57PM +0000, Dr. David Alan Gilbert wrote:
> > > > * Laurent Vivier (laurent@vivier.eu) wrote:
> > > > > Le 08/03/2021 à 12:46, Thomas Huth a écrit :
> > > > > > On 22/02/2021 08.28, Brad Smith wrote:
> > > > > > > OpenBSD has supported 64-bit time_t across all archs
> > > > > > > since 5.5 released in 2014.
> > > > > > > 
> > > > > > > Remove a time_t cast that is no longer necessary.
> > > > > > > 
> > > > > > > 
> > > > > > > Signed-off-by: Brad Smith <brad@comstyle.com>
> > > > > > > 
> > > > > > > diff --git a/migration/savevm.c b/migration/savevm.c
> > > > > > > index 52e2d72e4b..9557f85ba9 100644
> > > > > > > --- a/migration/savevm.c
> > > > > > > +++ b/migration/savevm.c
> > > > > > > @@ -2849,8 +2849,7 @@ bool save_snapshot(const char
> > > > > > > *name, bool overwrite, const char *vmstate,
> > > > > > >       if (name) {
> > > > > > >           pstrcpy(sn->name, sizeof(sn->name), name);
> > > > > > >       } else {
> > > > > > > -        /* cast below needed for OpenBSD where
> > > > > > > tv_sec is still 'long' */
> > > > > > > -        localtime_r((const time_t *)&tv.tv_sec, &tm);
> > > > > > > +        localtime_r(&tv.tv_sec, &tm);
> > > > > > >           strftime(sn->name, sizeof(sn->name),
> > > > > > > "vm-%Y%m%d%H%M%S", &tm);
> > > > > > >       }
> > > > > but the qemu_timeval from "include/sysemu/os-win32.h" still
> > > > > uses a long: is this file compiled for
> > > > > win32?
> > > > Yep this fails for me when built with x86_64-w64-mingw32- (it's fine
> > > > with i686-w64-mingw32- )
> > > We could just switch the code to use GDateTime from GLib and thus
> > > avoid portability issues. I think this should be equivalent:
> > > 
> > >       g_autoptr(GDateTime) now = g_date_time_new_now_local();
> > >       g_autofree char *nowstr = g_date_time_format(now,
> > > "vm-%Y%m%d%H%M%s");
> > >       strncpy(sn->name, sizeof(sn->name), nowstr);
> > 
> > Which way do you guys want to go? Something like above, remove the
> > comment
> > or some variation on the comment but not mentioning OpenBSD since it is
> > no
> > longer relevant?
> 
> Anyone?

Personally I always favour using GLib APIs if there's an applicable one,
since it eliminates portability problems - or rather offloads them to
the GLib maintainers, who have already solved them generally.

Regards,
Daniel
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