CODEWITHSUNDEEP
javasignals
M.E.
M.E.

Reputation: 5505

Is it possible to capture SIGWINCH in Java?

I have a console application I would like to react to changes in terminal size. In Linux/UNIX this is done through the SIGWITCH signal:

SIGWINCH 28 Window change. The WINCH signal is sent to a process when its controlling terminal changes size, for instance if you resize it in your window manager. 4.3 BSD, Sun Source: https://www.computerhope.com/unix/signals.htm

In the Java SE documentation I can find information relative to most common signals, but there is no reference to SIGWINCH. Source: https://docs.oracle.com/javase/10/troubleshoot/handle-signals-and-exceptions.htm

Is it possible to capture such signal?

Upvotes: 2

Views: 238

Answers (1)

Merijn Vogel
Merijn Vogel

Reputation: 306

Yes.

Use sun.misc.Signal and the static handle function:

jshell> import sun.misc.Signal;
jshell> Signal.handle(new Signal("WINCH"), s -> System.out.println(s.getName() + "(" + s.getNumber() + ")"));

If you resize the window, you'll see this handler being called. Note that this is JVM specific, this was tested on openjdk 16.0.1.

Upvotes: 1

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