[Bug 243177] open(2): Add O_CREATFIFO flag

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=243177

Brooks Davis <brooks@FreeBSD.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |brooks@FreeBSD.org
             Status|Open                        |Closed
         Resolution|---                         |Not A Bug
            Version|12.0-RELEASE                |Unspecified

--- Comment #2 from Brooks Davis <brooks@FreeBSD.org> ---
What is the threat model?  The purpose of a fifo is to rendezvous via the file
system which is inherently subject to races.  Creating and opening the fifo
atomically is all well and good, but something else with the right permissions
could just delete the fifo and create a new one in its place leaving a half
open fifo to nowhere.  If race-free communication is required, socketpair(2)
and fork(+execve) is probably a better choice.

If it still makes sense to implement something like this, it's worth noting
that we're quite close to running out of bits for new O_ flags.  A new syscall
(e.g., open_fifo_at(2)) might be a better option.

If we did this we'd want to build some consensus among various POSIX system
implementors before implementing something.  The FreeBSD bug database probably
isn't the place to do that so I'm closing this feature request.

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