Date: Wed, 10 Jan 2007 11:51:48 +0100 From: Tijl Coosemans <tijl@ulyssis.org> To: freebsd-current@freebsd.org Cc: Boris Samorodov <bsam@ipt.ru>, Alexander Leidinger <Alexander@leidinger.net>, Divacky Roman <xdivac02@stud.fit.vutbr.cz> Subject: Re: broken linuxulator in -current as of Jan 8 17:51:45 CET Message-ID: <200701101151.51662.tijl@ulyssis.org> In-Reply-To: <20070110075310.4vdsp3q68wgs4k4g@webmail.leidinger.net> References: <20070108165157.GA94941@stud.fit.vutbr.cz> <89559334@srv.sem.ipt.ru> <20070110075310.4vdsp3q68wgs4k4g@webmail.leidinger.net>
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On Wednesday 10 January 2007 07:53, Alexander Leidinger wrote:
> That's not possible. The way the linuxulator works is:
> - the linker in userland calls open("/foo/bar")
> - kernel looks for "/compat/linux/foo/bar"
> * it is there -> return it
> * it is not there -> look for "/foo/bar"
> + if it is there -> return it
> + if it is not there -> return error
> - the userland get's something which may be linux or FreeBSD stuff
> - the linker read()s this
> - the linker sees a wrong ELF ABI and bails out
That means the linker tries to open /usr/lib/librt.so.1 instead of
/lib/librt.so.1 which doesn't exist under /compat/linux. So I added a
symlink there.
ln -s ../../lib/librt-2.3.6.so /compat/linux/usr/lib/librt.so.1
And now everything works.
- the linker in userland calls open("/usr/lib/librt.so.1")
- kernel looks for "/compat/linux/usr/lib/librt.so.1"
* it is there -> return it
- the linker read()s this
- the linker sees a wrong linux kernel ABI (in case of 2.4.2)
and calls open("/lib/obsolete/linuxthreads/librt.so.1")
% ldd /compat/linux/bin/ls
/compat/linux/bin/ls:
librt.so.1 => /lib/obsolete/linuxthreads/librt.so.1 (0x4807c000)
I think this is an easier solution than changing the runtime linker.
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