Access to OS specific constants

[Guillaume Nodet]

Yes, those constants are defined as macros in headers.
The "--include-macro" is for jextract, right ? But this will generate
static code for the platform I'm running jextract on IIUC.  My problem is
that those constants do not have the same values, depending on the OS, so I
do need something dynamic.

Le ven. 3 juin 2022 à 15:30, Sundararajan Athijegannathan <
sundararajan.athijegannathan at oracle.com> a écrit :

> Are those constants #define'd as macros in headers? If so, you can extract
> (even selectively filter by --include-macro option). If those are from
> platform specific headers, you can still extract multiple headers and use a
> import static *
>
> -Sundar
> ------------------------------
> *From:* panama-dev <panama-dev-retn at openjdk.java.net> on behalf of
> Guillaume Nodet <gnodet at apache.org>
> *Sent:* 03 June 2022 18:17
> *To:* panama-dev at openjdk.java.net <panama-dev at openjdk.java.net>
> *Subject:* Access to OS specific constants
>
> I'm experimenting JEP 424 to support Jansi (
> https://github.com/fusesource/jansi), JLine (
> https://github.com/jline/jline3)
> and mvnd (https://github.com/apache/maven-mvnd).
>
> I've been able to replace a few native calls with the experimental API
> [1].  However, there's one thing I'd be missing in order to completely get
> rid of the native code : the java code needs to call the ioctl function
> [2], but that one takes an integer which value is defined in C headers.  In
> my case, this is the TIOCGWINSZ constant, which is defined in my library
> class [3] and initialized in the native code [4]. When the libraries are
> using JNA, I need to define specific constants for each system, see [5],
> [6], [7].  But this kinda defeats the purpose of portability.
>
> Any idea how to work around this problem ?
>
> Cheers,
> Guillaume Nodet
>
> [1] https://github.com/fusesource/jansi/tree/jep-424
> [2]
>
> https://github.com/fusesource/jansi/blob/jep-424/src/main/java/org/fusesource/jansi/AnsiConsoleHelper.java#L82
> [3]
>
> https://github.com/fusesource/jansi/blob/jep-424/src/main/java/org/fusesource/jansi/internal/CLibrary.java#L63
> [4]
>
> https://github.com/fusesource/jansi/blob/jep-424/src/main/native/jansi.c#L58
> [5]
>
> https://github.com/jline/jline3/blob/master/terminal-jna/src/main/java/org/jline/terminal/impl/jna/freebsd/CLibrary.java#L250
> [6]
>
> https://github.com/jline/jline3/blob/master/terminal-jna/src/main/java/org/jline/terminal/impl/jna/linux/CLibrary.java#L267
> [7]
>
> https://github.com/jline/jline3/blob/master/terminal-jna/src/main/java/org/jline/terminal/impl/jna/solaris/CLibrary.java#L267
>
> --
> ------------------------
> Guillaume Nodet
>


-- 
------------------------
Guillaume Nodet