Re: bash: please provide an easy way to spawn a new process group from script

[Oğuz]

1 Kasım 2020 Pazar tarihinde clime <clime7@gmail.com> yazdı:

> On Sun, 1 Nov 2020 at 11:01, Oğuz <oguzismailuysal@gmail.com> wrote:
> >
> >
> >
> > 1 Kasım 2020 Pazar tarihinde clime <clime7@gmail.com> yazdı:
> > ...
> >>
> >> Please, provide a syntactic construct to spawn a new process group (or
> >> at least there should be some usable command to do that).
> >>
> >
> > You can use the loadable builtin `setpgid' if you have to. Assuming
> BASH_LOADABLES_BUILTIN is set, this should work:
> >
> >     enable -f setpgid{,}
> >     { setpgid $BASHPID{,}; a | b; } &
> >     setpgid $!{,}
> >     kill -- -$!
>
> Hello, it doesn't work for me:
>
> $ export BASH_LOADABLES_BUILTIN=1


by set, I meant to a path where loadable builtin binaries reside


> $ enable -f setpgid{,}
> bash: enable: cannot open shared object setpgid: setpgid: cannot open
> shared object file: No such file or directory
>
> Also it looks quite complex. Why isn't there a simple (already
> enabled) builtin e.g. like:
>
> newpgid { a | b; } & pid=$!
>
> where pid for `{ a | b; } &` will be stored in pid and will be also
> the new gpid of the spawned process group.
>
> Work with process groups should be natural in bash. It can't be that
> complex. I struggled with this for several hours and found lots of
> people on the net that struggled with the same problem too.
>
> (in the end, i needed to do a helper function which uses ps to
> recursively collect children of that process and then i passed all
> those children to kill which is probably valid but one would expect
> bash can do this in a better way and this really delayed my work).
>
> Thank you very much
> clime
>
> >
> >
> >>
> >> Thank you
> >> clime
> >>
> >
> >
> > --
> > Oğuz
> >
>


-- 
Oğuz