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

Incidentally, nowhere do the man-pages state that unless you use 
an SA_ONSTACK handler, having used sigaltstack() to set the 
stack used to invoke the handler, then you get garbage pointed
to by the siginfo_t 'si' pointer 2nd parameter to the handler,
which is definitely the case.
Also, unless you actually call fcntl(fd, F_SETSIG, signum), then
no si->_sifields._sigpoll information is set at all - the 
manual pages definitely suggest that SIGIO / SIGPOLL is the
default, but do not mention that the default does not apply
to SA_SIGACTION signal handlers .

Oh well, I was hoping to avoid having to do so, but I guess there
is no alternative to making the program use poll / pselect .
But the documentation is definitely in need of clarification of
the above points.

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