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# ``twisted`.`internet`.`interfaces`.`_ISupportsExitSignalCapturing``

interface documentation

`class _ISupportsExitSignalCapturing(Interface): (source)`

Known implementations: `twisted.internet.base.ReactorBase`

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An implementor of `_ISupportsExitSignalCapturing` will capture the value of any delivered exit signal (SIGINT, SIGTERM, SIGBREAK) for which it has installed a handler. The caught signal number is made available in the _exitSignal attribute.

Attribute | `_exitSignal` | `int` or `None`, the integer exit signal delivered to the application, or None if no signal was delivered.

_exitSignal = (source)

`int` or `None`, the integer exit signal delivered to the application, or None if no signal was delivered.