Subject: Re: an emulation environment dilema...
To: NetBSD-current Discussion List <firstname.lastname@example.org>
From: Greg A. Woods <email@example.com>
Date: 10/22/1998 21:31:19
[ On Thu, October 22, 1998 at 18:01:45 (-0700), Jonathan Stone wrote: ]
> Subject: an emulation environment dilema...
> I think is lossage due to the order of emul prefixing:
> it isn't being applied to the target of the symlink.
> If we did that (which in this case we clearly should), everything
> would Just Work.
Ah! Symlinks. I should probably also reveal that my /emul directory is
itself a symlink too:
20:59  $ ls -l /emul
lrwxr-xr-x 1 root wheel 8 May 16 16:49 /emul -> usr/emul
(and I should point out that I'm running NetBSD/sparc 1.3.2)
Making /emul/sunos/bin a real directory and putting a hardlink to the
arch binary doesn't help any....
Your comments seem to suggest that this should already be working. I
didn't get that impression from the compat_sunos(8) manual page, though
it's fairly shy on how things are implemented and I hadn't read any of
the other compat_*(8) documents recently. I see that in compat_linux(8)
for example there's a good description of how files will be tried with
the /emul/linux/ prefix first. I guess my report really should have
been a PR, and I suppose someone in the know should clean up the
compat_*(8) pages, perhaps with one common page for "how it works" and
OS specific ones for how to set it up...
AH! I note there's a related bug described in compat_linux(8):
Pathnames pointed to by symbolic links are not looked up in the shadow
root when running a Linux executable. This is not consistent.
compat_svr4(8) and compat_freebsd(8) has a similar description of
the prefixing of open()s, but do not include the above bug.
compat_sunos(8) and compat_ultrix(8) do not mention the prefixing magic,
though the latter does allude to it rather explicilty by giving examples
showing such prefixes. Neither mention the symlink bug.
Greg A. Woods
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