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    SubjectRe: [PATCH][RFC] Pollable /proc/<pid>/ - avoid SIGCHLD/poll() races
    >> The only real user-space solution to this is to have the SIGCHLD
    >> handler somehow cause the select() to return immediately
    >... or implement pselect:

    Agreed, althought that's not a user-space solution. Is there any
    fundamental reason why no-one's implemented pselect()/ppoll() for Linux

    >or use sigsetjmp/siglongjmp

    Yes, that would probably solve the situation in question, provided that
    siglongjmp() is portably safe. (A comment on LKML in the past suggested
    that it's not safe on cygwin, for example.)

    >Both would be portable and not special to child handling.

    One advantage of the pollable /proc/<pid>, (when combined with
    do_notify_parent() waking tsk->exit_chldwait) is that any process can
    check for the exit of any other process (not just direct children) in a
    select()/poll() call.


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