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

[Masatake YAMATO]

> I personally use this:
> 
> strace -p "$(cat
> /sys/fs/cgroup/system.slice/httpd.service/{cgroup.procs,tasks})"
> 
> Works for both cgroup versions.

I wonder how useful if we have following option(s):

  strace --cgroup=system.slice/httpd.service

and/or

  strace --systemd-unit=httpd.service

.

> 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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