[Bug 95331] fcntl.2 + sigaction.2 + signal.7 need further information about use of a SA_SIGINFO signal handler that uses si->si_fd

https://bugzilla.kernel.org/show_bug.cgi?id=95331

--- Comment #7 from Jason Vas Dias <jason.vas.dias-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> ---

Note that poll() or select() return immediately for writable pipe file
descriptors
on which there are no readers with open file descriptors with :
  pollfd.revents & ( POLL_ERR | POLLOUT )  set, so one cannot set 
  struct pollfd's events' POLLOUT bit and then use poll() or select()
  without some form of busy-waiting or nanosleep() or user-space polling,
  thus making 100% SIGIO driven I/O on pipes impossible IMHO .

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