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Date: Sat, 15 Jul 2023 14:35:11 -0400
From: Rich Felker <dalias@...c.org>
To: Alejandro Colomar <alx@...nel.org>
Cc: Paul Eggert <eggert@...ucla.edu>, Sam James <sam@...too.org>,
libc-coord@...ts.openwall.com, linux-man@...r.kernel.org,
"A . Wilcox" <AWilcox@...cox-tech.com>,
Jonathan Wakely <jwakely@...hat.com>, libc-alpha@...rceware.org,
musl@...ts.openwall.com, Szabolcs Nagy <nsz@...t70.net>,
Jakub Wilk <jwilk@...lk.net>
Subject: Re: [musl] Re: [PATCH v4] off64_t: prefer off_t for
splice, etc.
On Sat, Jul 15, 2023 at 05:08:18PM +0200, Alejandro Colomar wrote:
> Hi Paul, Sam, and Rich,
>
> On 2023-07-09 08:16, Sam James wrote:
> >
> > Paul Eggert <eggert@...ucla.edu> writes:
> >
> >> For the few functions that come only in 64-bit off_t flavors,
> >> document their APIs as using off_t instead of off64_t,
> >> and say also that code should #define _FILE_OFFSET_BITS 64.
> >> This documents what user code is (and should be) doing anyway,
> >> if it needs to work on traditional x86 and ARM Linux.
> >
> > LGTM and thank you Paul.
> >
> > I haven't checked for other prototypes/examples which need
> > changing.
>
> Thanks, I'm going to apply the patch. Can you please confirm if I'm
> correct in adding the following tags?
>
> Reported-by: Rich Felker <dalias@...c.org>
> Fixes: 9bebb17e5b57 ("splice.2: Use 'off64_t' instead of 'loff_t'")
> Fixes: 76c5631fb442 ("copy_file_range.2: Document glibc wrapper instead of kernel syscall")
> Fixes: 5cabfa06b407 ("man-pages 1.68")
> Fixes: 3ca974e3988a ("New page for sync_file_range(2), new in kernel 2.6.17.")
> Fixes: 9bebb17e5b57 ("sync_file_range.2: Document the architecture-specific sync_file_range2() system call")
> Fixes: 79bf8cdcf36a ("Document fopencookie(3), a library function that allows custom implementation of a stdio stream.")
> Signed-off-by: Paul Eggert <eggert@...ucla.edu>
> Reviewed-by: Sam James <sam@...too.org>
> Cc: Jonathan Wakely <jwakely@...hat.com>
> Cc: Szabolcs Nagy <nsz@...t70.net>
> Cc: Jakub Wilk <jwilk@...lk.net>
> Cc: A. Wilcox <AWilcox@...cox-tech.com>
> Signed-off-by: Alejandro Colomar <alx@...nel.org>
>
>
> BTW, Rich, please note the commits that this fixes: most of them are
> the initial commit that adds a page, which means that the function
> had always been documented with off64_t in the "spec". Only splice(2)
> and copy_file_range(2) have been adjusted afterwards, and in a manner
> to be consistent with the rest of the pages, so I can only conclude
> that we didn't break the spec, but rather fixed it.
>
> Nevertheless, I'm sorry that it caused any problems to musl, and I'm
> happy that you reported them and so we can now improve the pages.
While I like off_t, I am still unhappy that this seems to have been a
unilateral action from documentation side without even hearing input
from any major implementors other than myself. Is "you can't use these
interfaces without -D_FILE_OFFSET_BITS=64" an acceptable outcome to
the glibc folks?
Rich
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