marco.antoniotti at unimib.it
Wed Jun 12 06:28:01 UTC 2019
> On Jun 11, 2019, at 11:33 , Mark Evenson <evenson at panix.com> wrote:
>> On Jun 5, 2019, at 17:53, Marco Antoniotti <marco.antoniotti at unimib.it> wrote:
>> Dear all,
>> I have been looking at the ABCL manual and packages and I was not able (my fault!) to find functions like CURRENT-DIRECTORY and/or CHANGE-DIRECTORY (or CHDIR).
>> Could you tell me how to get to this functionality?
> Unfortunately, the JVM doesn’t have a [standard interface to change the working directory] there is no direct method to setting the current working directory. The JVM gets a copy of the system environment variables including the current working directory
> : https://stackoverflow.com/questions/840190/changing-the-current-working-directory-in-java
Ok. Thanks. Understood. So this is a Java “feature”.
> It would help to know more specifically what you wish to do after changing the directory, but here’s a guess at what you may wish to do:
> If you wish invoke purely Lisp-side functionality, then use the value of CL:*DEFAULT-PATHNAMES-DEFAULTS*, which is what UIOP/OS:GETCWD returns.
That is what I fall back to. I was just wondering if there was a “to-the-file-system” primitive. *D-P-D* munging will do.
> If you wish to fork processes in another directory then the specify the relavant argument to UIOP/RUN-PROGRAM:RUN-PROGRAM.
> In very pathlogical cases you may have to write a script that ensures the JVM hosting ABCL is started in the directory you wish to have as the current directory. I had to do this in order to get a Minecraft server to run under ABCL.
Ok. Nothing of the kind is really needed.
>> Also, what is the set of features that ABCL uses to identify the platform? On a Mac OSX I see (at a minimum):
> The code which sets platform features is the [best source of what keywords identify which plaform features]. Additionaly, there is (incomplete) support for identifying the JVM version by the use of the :java-1.6, :java-1.7, and :java—1.8 keywords. Again, it would be helpful to know what sort of platform features you wish to detect.
> : https://abcl.org/trac/browser/trunk/abcl/src/org/armedbear/lisp/Lisp.java#L2362
Thanks. I just wanted to know what set of features I can use to know that I am running on a Mac OS X or, say, a Windows 10. It looks like that (and :UNIX :DARWIN) is what I need for Mac OS X and WINDOWS for all Windows.
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