Bug#555303: kfreebsd-8: problems with *at syscalls

[Petr Salinger <Petr.Salinger@seznam.cz>]

> I tracked down the problem to the AT_* #define that are different
> between GNU/Linux and GNU/Hurd on one side and GNU/kFreeBSD on the other
> side.
>
> I have committed a patch to glibc-bsd to move those definitions to
> bits/fcntl.h. The same has to be done on upstream glibc, which impact
> quite a lot of files. Before actually doing it, I do wonder if we
> shouldn't instead translate the values in our *at functions, which
> should also solve the problem of already built binaries using the old
> value.
>
> What do you think?

1) the AT constants might be put into a different new file,
   i.e. <bits/atfile.h> or <bits/atfcntl.h>. This way it would suffice
   just only one new generic file.

2) I am in favor change AT constant to match native FreeBSD.
   The *at functions have been introduced in 2.4 glibc,
   at about 8700 binary pakages have Depends "libc0.1 (>= 2.3",
   these are definitely not affected. We might look into remaining 650
   binary packages and decide which need a binNMU.

> The patch fixes all failures except:
> - io/tst-renameat.out: the test verifies error with wrong arguments, and
>  the FreeBSD kernel does not check the errors in the same order when
>  there are two or more errors, so and error is returned, but not the
>  one expected by the tests. I think we can live with that.
> - io/tst-mknodat.out: it's not possible to use mknod outside of /dev on
>  GNU/kFreeBSD, this is not specific to the *at syscall.

This sounds promising.

Many thanks

		Petr