[Bug libc/26371] [RFE] please add clone3() wrapper (in particular the CLONE_INTO_CGROUP feature of it)

["fweimer at redhat dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=26371

Florian Weimer <fweimer at redhat dot com> changed:

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--- Comment #1 from Florian Weimer <fweimer at redhat dot com> ---
My understanding if this issue is that the clone3 wrapper will not actually
help you that much.

I suspect what you actually need is a way to perform certain system calls after
calling clone3. The newly created userspace thread will eventually call execve,
but it is *not* expected to replace the original process (unlike calling execve
from a full libc thread created by pthread_create).

Can you describe in a bit more detail what you need? To what extent to do you
need to share address space? Are you looking for a vfork-style clone? It makes
things simpler because you could share the stack, and error reporting could use
shared memory.

Which system calls do you need to call?

Would you be able to call different functions than the usual system call
wrappers to perform the tasks you need?

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