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RE: Symbols in executable available to dynamic stuff
- X-seq: zsh-workers 4658
- From: "Andrej Borsenkow" <borsenkow.msk@xxxxxx>
- To: "Geoff Wing" <gcw@xxxxxxxxx>, "Zsh Hackers" <zsh-workers@xxxxxxxxxxxxxxx>
- Subject: RE: Symbols in executable available to dynamic stuff
- Date: Tue, 17 Nov 1998 11:51:55 +0300
- Importance: Normal
- In-reply-to: <19981114181808.A6571@xxxxxxxxxxxxxxx>
The problem is, that loadable modules needs access to symbols from "main"
zsh. Hash tables, parameter functions etc On some systems (notably SVR4),
symbols from a.out are *not* accessible to outside world. In this case, ZSH
is built as dynamic sjared library with stub a.out, which is just linked
against libzsh.so and calls ZSH entry point there.
> -----Original Message-----
> From: Geoff Wing [mailto:gcw@xxxxxxxxx]
> Sent: Saturday, November 14, 1998 10:18 AM
> To: Zsh Hackers
> Subject: Symbols in executable available to dynamic stuff
> can I cause some more trouble yet? :-)
> Way, way back in Zefram's patch 3038 came aczsh.m4 and this gem:
> Check whether symbols in the executable are available to dynamically
> loaded libraries.
> (And BTW, the description's wrong: it checks dynamically loaded objects,
> which are not necessarily libraries)
> If yes, then we don't build a dynamic zsh. What's the danger here? If
> you control your executable, library and $MODULEPATH then why does it
> matter if objects you load can run subroutines from outside their object
> space? Or is it more specific than that? Obviously, routines in
> dynamically loaded modules (eg. genprompts() in zle module) need
> to be able
> to run routines in other modules or libraries (eg. countprompt() in zsh
> library) so there is some big thing here I'm missing perhaps?
> Anyone care to enlighten me, please?
> Geoff Wing <gcw@xxxxxxxxx> Mobile : 0412 162 441
> Work URL: http://www.primenet.com.au/ Ego URL: http://pobox.com/~gcw/
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