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Date: Fri, 7 Jun 2019 02:18:53 -0400
From: Rich Felker <dalias@...c.org>
To: musl@...ts.openwall.com
Subject: Re: [PATCH 1/2] define daddr_t type
On Fri, Jun 07, 2019 at 08:06:20AM +0200, Petr Vorel wrote:
> Hi Rich,
>
> > > ....
> > > > > +++ b/include/sys/types.h
> > > > > @@ -29,6 +29,7 @@ extern "C" {
> > > > > #define __NEED_clock_t
> > > > > #define __NEED_suseconds_t
> > > > > #define __NEED_blksize_t
> > > > > +#define __NEED_daddr_t
> > > ....
>
> > > > daddr_t is not a standard type, so can't be exposed by default here
> > > > (aside from the dubious "*_t is always reserved" rule), and it's only
> > > So should it be wrapped by #if defined(_GNU_SOURCE) || defined(_BSD_SOURCE) ?
>
> > > > proposed to be used in one header, so it doesn't belong in alltypes.h
> > > > either.
> > > Where should it be then? Shell I create bits/types.h for it?
> > > The goal is to be loadable from <sys/types.h>
>
> > Why? It's not a reasonable type for any application to use -- we've
> > never gotten a report that something failed to build because of its
> > absence, and even if we did, it would almost surely be a case of "fix
> > the application". It looks like the only reason you wanted it was to
> > fix the type of a field in an mtio structure, and in that case the
> > type would just need to be defined in mtio.h.
>
> I need it for LTP [1]. It's actually workaround for missing struct ustat [2].
> If it's really useless to have it in musl, I'll use in LTP __kernel_daddr_t from <linux/types.h>.
>
> [1] https://patchwork.ozlabs.org/patch/1102380/
> [2] https://github.com/linux-test-project/ltp/blob/master/include/lapi/ustat.h
Per http://man7.org/linux/man-pages/man2/ustat.2.html:
ustat() is deprecated and has been provided only for
compatibility. All new programs should use statfs(2) instead.
AFAIK we've never hit anything that needed/wanted ustat, and the
interface has fundamental limitations that make it mostly (entirely?)
non-useful. I'm not sure why LTP is testing it...
Rich
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