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    SubjectRe: [RFC] new syscall to allow notification when arbitrary pids die
    On Sat, May 10, 2003 at 02:29:54AM -0400, Chris Friesen wrote:

    > I see two immediate uses for this. One would be to enable a "watcher"
    > process which can do useful things on the death of processes which
    > registered with it (logging, respawning, notifying other processes,
    > etc).

    Do it from user space, kill(pid, 0), check for ESRCH. I might see the
    benefit of a new system call if it was synchronous (wait() semantics),
    but since signal delivery is asynch anyway....

    > The second would be to enable mutual
    > suicide pacts between processes. (I'm not sure when I would use this, but
    > it sounds kind of fun.)

    Same thing, kill(pid, 0).

    > Anyone have any opinions on this?

    There's already a well established way to do what you want (get
    non-immediate notification of process death). What benefit would your
    approach give?
    Muli Ben-Yehuda

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