Access to OS specific constants

[Sundararajan Athijegannathan]

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

--
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Guillaume Nodet