Messages in this thread | | | From | (Eric W. Biederman) | Date | Thu, 06 Dec 2018 08:46:57 -0600 | Subject | Re: [PATCH v4] signal: add taskfd_send_signal() syscall |
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Florian Weimer <fweimer@redhat.com> writes:
> * Eric W. Biederman: > >> 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
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