[fpc-pascal] how to use signals in freepascal?

[Xiangrong Fang]

>
> You should not use this in fact, it is meant for internal use.
>
> To write a signal handler on unix, see
>
> http://www.freepascal.org/docs-html/rtl/baseunix/fpsigaction.html
>
> there is an example.


​I tried example57, it worked, but I still do not know some peculiar
behaviors in it​. I will ask later, after some investigations.

However, what is HookSignal for? How to use it? Or it is just a "stub" and
not functional yet?

Thanks!
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