From: Rich Felker <dalias@aerifal.cx>
To: musl@lists.openwall.com
Subject: Re: semtcl for x86_64
Date: Sat, 22 Sep 2012 08:25:29 -0400 [thread overview]
Message-ID: <20120922122529.GU254@brightrain.aerifal.cx> (raw)
In-Reply-To: <alpine.LNX.2.02.1209221416330.12327@laas.mine.nu>
On Sat, Sep 22, 2012 at 02:17:08PM +0200, Jens wrote:
>
>
> On Sat, 22 Sep 2012, Rich Felker wrote:
>
> >On Sat, Sep 22, 2012 at 11:17:14AM +0200, Jens wrote:
> >>
> >>
> >>On Sat, 22 Sep 2012, Jens wrote:
> >>
> >>>
> >>>Hello I have some trouble getting semctl working:
> >>>
> >>>Tried in both musl and uclibc to compare.
> >>
> >>Forgot to mention its musl 0.9.6.
> >>
> >>Cheers,
> >>Jens
> >
> >Should be fixed now... Please let me know if it's still broken.
>
> Ah. great! And I just finished the analysis.. :-)
Basically, some archs (approximately the 32-bit ones) have ancient
legacy versions of the IPC structures that only support 16-bit
uid/gid, etc. musl does not support using these, and always uses the
modern structures, which requires the IPC_64 flag (0x100) when making
the syscall. I assumed this flag would be a no-op on systems where
it's not needed, but for some reason the kernel rejects it, so we have
to go to the trouble of omitting it..
Rich
next prev parent reply other threads:[~2012-09-22 12:25 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-22 8:26 Jens
2012-09-22 9:17 ` Jens
2012-09-22 12:04 ` Rich Felker
2012-09-22 12:17 ` Jens
2012-09-22 12:25 ` Rich Felker [this message]
2012-09-22 17:09 ` Jens
2012-09-22 20:09 ` Rich Felker
2012-09-22 12:14 ` Jens
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