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    SubjectRe: [PATCH v6 4/5] seccomp: add support for passing fds via USER_NOTIF
    On Thu, Sep 20, 2018 at 07:18:45PM -0700, Andy Lutomirski wrote:
    > Hmm. This does mean that we need a test case for a user notifier
    > returning -ERESTARTSYS. It should Just Work (tm), but those are
    > famous last words.

    Just to confirm, I've got a test case that works like this:

    1. fork and install a SIGUSR1 handler
    2. tracee does a syscall that gets trapped
    3. send SIGUSR1
    4. respond from the listener with -ERESTARTSYS
    5. see another of the same syscall, even though the tracee still thinks
    its in the first one
    6. respond with something reasonable, the tracee sees this response

    I think that's the intended behavior. Note that when the listener
    responds with -ERESTARTSYS and there is no signal pending, the task
    just dies. That might be reasonable, I'm not sure.

    Tycho

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