[strace/strace] tracing all children of an already started program. (#193)

[Renaud Métrich]

I personally use this:

strace -p "$(cat 
/sys/fs/cgroup/system.slice/httpd.service/{cgroup.procs,tasks})"

Works for both cgroup versions.

On 11/24/21 09:34, Masatake YAMATO via Strace-devel wrote:

>     Yep.. I was just saying it would be a nice feature to have in the
>     same program without using external ones.
>
> I agree with you if more than one program, pstree, pidof, grep and/or 
> sed are needed.
> However, I think just one, pgrep (or pidof) is acceptable.
> If strace introduces an option implementing the feature requested 
> here, the user must remember the option to enable the feature.
> |[tab]| key with a modern shell may help us but remembering the 
> command fragment, |-p "$(...)"| is not hard for me.
>
> I was directly taught this fragment by @ldv-alt 
> <https://github.com/ldv-alt>, the maintainer of strace!
> https://lists.strace.io/pipermail/strace-devel/2018-March/007950.html
> https://lists.strace.io/pipermail/strace-devel/2018-March/007951.html
>
> The lesson was not free. I had to submit a patch to procps-ng as fee.
> https://gitlab.com/procps-ng/procps/-/merge_requests/58
>
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