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Re: Bash spews bracketed-paste escape sequences when handling signal.


From: microsuxxor
Subject: Re: Bash spews bracketed-paste escape sequences when handling signal.
Date: Wed, 18 Dec 2024 22:59:38 +0100

were my wrong assumptations .. sry .. peace ..

On Wed, Dec 18, 2024, 10:57 PM Kaz Kylheku <kaz@kylheku.com> wrote:

> On 2024-12-18 13:46, microsuxxor wrote:
> > try
> >
> > p=$$ ; while sleep 1 ; do kill -USR1 "$p" ; done &
>
> That's not necessary; my existing repro steps successfully show
> a difference between two signals, that being the only
> difference between them.
>
> The $$ parameter is expanded to a decimal numeric word
> *before* the while command is executed, so the background process
> is referencing the correct PID of the parent. There is no need to
> smuggle the PID through a variable. $$ in the while command will not
> refer to the child process'
>
> (That would be an issue if we had used eval:
>
>  eval 'command ... $$ ...' &
>
> now we backgrounded the eval, which then in the background
> process parses the shell syntax and does all the expanding.
> Now $$ is the PID of the background process, not that of
> the shell which launched it.)
>
> > try also trap - USR1 in the new process ( the while loop )
>
> We don't want that at all. The new process is just a helper
> to generate the signal to our main process. It doesn't
> receive the signal itself.
>


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