linux-kernel - Re: Revised statx(2) man page for review

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Message-ID: <20170426104331.nxfk5gopskaklpmj@crack.deadbeast.net>
Date:   Wed, 26 Apr 2017 06:43:33 -0400
From:   "G. Branden Robinson" <g.branden.robinson@...il.com>
To:     "Michael Kerrisk (man-pages)" <mtk.manpages@...il.com>
Cc:     "Dmitry V. Levin" <ldv@...linux.org>,
        David Howells <dhowells@...hat.com>,
        Jeff Layton <jlayton@...hat.com>,
        lkml <linux-kernel@...r.kernel.org>,
        Linux API <linux-api@...r.kernel.org>,
        linux-man <linux-man@...r.kernel.org>
Subject: Re: Revised statx(2) man page for review

At 2017-04-26T07:42:12+0200, Michael Kerrisk (man-pages) wrote:
> On 04/25/2017 10:06 PM, Dmitry V. Levin wrote:
> > On Tue, Apr 25, 2017 at 01:14:26PM +0200, Michael Kerrisk (man-pages) wrote:
> > [...]
> >>        The file timestamps are structures of the following type:
> >>
> >>            struct statx_timestamp {
> >>                __s64 tv_sec;    /* Seconds since the Epoch (UNIX time) */
> >>                __s32 tv_nsec;   /* Nanoseconds before or since tv_sec */
> >>            };
> > 
> > Nanoseconds since tv_sec.  The "before tv_sec" is not implemented yet
> > and I hope nobody is going to implement it for the reasons I mentioned
> > in https://marc.info/?i=20170422192743.GA17005%40altlinux.org
> 
> Thanks Dmitry. Fixed.

If you give a programmer a signed type, he or she will cheerfully stuff
negative values into it, perhaps to carry out-of-band information as
with IEEE NaNs and tagged pointers.

The user should be admonished against using the full range of the type
in any case ([0, 1e9 - 1]).

Regards,
Branden

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