Date: Sat, 6 Feb 1999 21:08:14 +0000 (GMT) From: Terry Lambert <tlambert@primenet.com> To: jdp@polstra.com (John Polstra) Cc: tlambert@primenet.com, mjacob@feral.com, alpha@FreeBSD.ORG Subject: Re: Could somebody please test this patch? Message-ID: <199902062108.OAA17997@usr02.primenet.com> In-Reply-To: <XFMail.990205170159.jdp@polstra.com> from "John Polstra" at Feb 5, 99 05:01:59 pm
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> > which gets mapped to a specific address for Alpha binaries by the
> > image activator,
>
> Fine, then _tell_ me what the specific address is supposed to be,
> if there even really is one. I know there's a specific address in
> SVR4/i386, but as yet you've given me no reason to think the address
> is wired down on the Alpha. Just saying it's wired down doesn't do
> anybody a bit of good if you don't state what the address is supposed
> to be.
Do you have a copy of DEC UNIX with a compiler?
Write a program:
main()
{
for(;;) {
sleep(1000);
}
}
And then examine the memory mappings for it.
I can't really *prove* that the thing *never* maps it to a different
location, but I've put loops like that into much more complex programs
and not had it move around.
> > not the crt0.o (that's why you can dlopen from static executable on
> > an Alpha; same for SVR4 and Solaris, for that matter).
>
> As I've told you at least four times in the mailing lists, that is
> misinformation. I know from first-hand experience (and from man
> pages) that you can't use dlopen in static executables under SVR4.
> And I and others have quoted every variety of Solaris man page to you,
> which specifically say you can't do it. I wish you'd quit spreading
> it around that you can, because it's utterly false.
Ugh.
There isn't a static "libdl".
You're right. I screwed up and assumed that the libdl was statically
linked.
Hmmm... you *can* use mmap and libelf to get the offsets, right? So
it is possible to support loadable code modules in a static binary,
it's just an implementation decision that that's not how dlopen
itself is implemented.
Terry Lambert
terry@lambert.org
---
Any opinions in this posting are my own and not those of my present
or previous employers.
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