Re: [PATCH v4] signal: add taskfd_send_signal() syscall

Florian Weimer [off-list ref] writes:

* Eric W. Biederman:

quoted

Floriam are you seeing a problem with this behavior or the way Christian
was describing it?

My hope is that you could use taskfd_send_signal one day to send a
signal to a process which you *known* (based on how you've written your
application) should be running and not in a zombie state, and get back
an error if it has exited.

If you get this error, only then you wait on the process, using the file
descriptor you have, and run some recovery code.

Wouldn't that be a reasonable approach once we've got task descriptors?

Getting an error back if the target was a zombie does seem reasonable,
as in principle it is an easy thing to notice, and post zombie once the
process has been reaped we definitely get an error back.

I also agree that it sounds like an extension, as changing the default
would violate the princile of least surprise.

Eric