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Re: signals ignored in a subshell


From: Oğuz
Subject: Re: signals ignored in a subshell
Date: Sun, 5 Apr 2020 12:42:58 +0300

5 Nisan 2020 Pazar tarihinde Robert Elz <address@hidden> yazdı:

>     Date:        Sun, 5 Apr 2020 05:06:56 +0300
>     From:        =?UTF-8?B?T8SfdXo=?= <address@hidden>
>     Message-ID:  <CAH7i3Lr5TTK+N-qC39+nmSo7jjhzDvPux39N4i2MyP5LCnnv5
> address@hidden>
>
>   | I was expecting it to work (i.e interrupt read again and call foo)
>
> Isn't that what it did?


No, it ignored/blocked 2nd SIGINT .


> But I see what you mean now, during the read that's called from the
> trap execution call of foo, SIGINT is blocked - that most probably should
> not happen, and it looks as if when the trap handler exits, the
> original read is resumed, that certainly shouldn't happen.
>
>
Exactly. In my opinion, read should behave the way wait does: fail upon a
signal for which a trap is set, and return a non-zero value when handler
returns. Don't really know how hard it would be to implement that though.

I cloned and compiled bash's devel branch and tested this on it. It keeps
printing a warning message upon every SIGINT (but doesn't ignore them).


> Still, I don't believe that the way the function is written is a way
> that you can expect will work necessarily.
>
>
That function is a simplified version of a script posted here:
https://stackoverflow.com/questions/61023171/bash-trap-sigint-multiple-times-doesnt-work


> kre
>
>

-- 
Oğuz


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