Package org.jline.terminal.impl

Class NativeSignalHandler

java.lang.Object

org.jline.terminal.impl.NativeSignalHandler

All Implemented Interfaces:

Terminal.SignalHandler

public final class NativeSignalHandler
extends Object
implements Terminal.SignalHandler

Implementation of SignalHandler for native signal handling.

The NativeSignalHandler class provides an implementation of the SignalHandler interface that represents native signal handlers. It defines two special instances that correspond to the standard POSIX signal dispositions:

• SIG_DFL - The default signal handler
• SIG_IGN - The signal handler that ignores the signal

This class is used internally by terminal implementations to represent native signal handlers. It cannot be instantiated directly, and its handle(Signal) method throws an UnsupportedOperationException because native signal handling is performed by the underlying platform, not by Java code.

See Also:

• Terminal.SignalHandler
• Terminal.handle(Signal, SignalHandler)

Field Summary

Fields

Modifier and Type	Field	Description
static final NativeSignalHandler	SIG_DFL	The default signal handler.
static final NativeSignalHandler	SIG_IGN	The signal handler that ignores signals.

Method Summary

Modifier and Type	Method	Description
void	handle(Terminal.Signal signal)	Handles the specified signal.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

SIG_DFL

public static final NativeSignalHandler SIG_DFL

The default signal handler.

This constant represents the default signal handler, which corresponds to the SIG_DFL disposition in POSIX systems. When a signal is handled by the default handler, the default action for that signal is taken, which varies depending on the signal (e.g., termination, core dump, ignore, etc.).

SIG_IGN

public static final NativeSignalHandler SIG_IGN

The signal handler that ignores signals.

This constant represents the signal handler that ignores signals, which corresponds to the SIG_IGN disposition in POSIX systems. When a signal is handled by this handler, the signal is ignored and no action is taken.

Method Details

handle

public void handle(Terminal.Signal signal)

Handles the specified signal.

This method always throws an UnsupportedOperationException because native signal handling is performed by the underlying platform, not by Java code. The NativeSignalHandler instances are only used as markers to indicate which native signal handler should be used.

Specified by:

handle in interface Terminal.SignalHandler

Parameters:

signal - the signal to handle

Throws:

UnsupportedOperationException - always thrown to indicate that this method cannot be called directly