Setting environment variables

[Alan Ruttenberg]

On Tue, May 2, 2023 at 2:37 AM Mark Evenson <evenson at panix.com> wrote:

>
> A patch for ABCL to add this would be appreciated, but the implementation
> should somehow be changed to the “standard” load for JNA by the ABCL-ASDF
> contrib, namely something like
>
>    (require :abcl-contrib)
>    (asdf:make :jna)
>
>
> As I understand it, Alan’s implementation only works if ABCL-ASDF:RESOLVE
> is present, meaning it cannot be put “as is” in the base ABCL system.  I
> believe this is possible because the OWL2 application uses the ABCL-AIO
> build of ABCL which merges abcl.jar which abcl-contrib.jar, but I could be
> wrong.


It's true that I use aio. TBH I've never understood the point of separating
the contribs from the base. File size isn't an issue any more. What's the
upside of splitting them apart? A bit of extra time indexing the classes in
the jar?

Conceptually, we should somehow place the implementation of setting
> environment variables via the C syscall as a patch in the contrib system in
> a new contrib called (?) USE-POSIX-SYSCALLS (terrible name, please
> change).  Such a new contrib would a) depend on
>  JNA and b) have to be used via
>
>    (asdf:make :use-posix-syscalls)
>

I don't know what asdf:make does. I tried it in a situation (autoloading
the java parser when #1 was used the first time) where I expected it to
load a system and it didn't seem to.

Would it be sufficient to do something like:

(defun ensure-jna-loaded ()
  (or *jna-loaded*
      (progn
        (when (not (ignore-errors (find-java-class 'jna.nativelibrary)))
          (require 'abcl-asdf)
          (add-to-classpath (funcall (intern "RESOLVE" 'abcl-asdf
"net.java.dev.jna/jna/LATEST")))
          (setq *jna-loaded* t)))))

This is assuming that abcl-contrib is available. Since I've never used
contrib separately, I'm not sure what the standard pattern is for using
something in contrib if it's not on the classpath.
Mind you find-java-class is also part of jss, which is a contrib, which I
always load...

Bottom line is that I don't know how to package this under whatever the
assumptions are when not using abcl-aio

Alan



>
>
>
> --
> "A screaming comes across the sky.  It has happened before but there is
> nothing
> to compare to it now."
>
>
>
>
>
>
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