[TUHS] Portals in 4.4 BSD

Tony Finch dot at dotat.at
Fri Apr 29 21:15:02 AEST 2016

Ramakrishnan Muthukrishnan <ram at rkrishnan.org> wrote:
> I read with a lot of interest, an old Usenix paper by the late Richard
> Stevens on a system called "Portals": [...]
> Wondering if this survived in any existing, so called "modern" Unix.

A descendent of the original code is still present in DragonFlyBSD:


The facility still exists in NetBSD but it has been reimplemented on top
of puffs, the Pass-to-Userspace Framework File System development


It survived in FreeBSD for a long time, but eventually was removed in 2012
rather than being made multiprocessor-safe.


It also got removed from OpenBSD in 2011.


f.anthony.n.finch  <dot at dotat.at>  http://dotat.at/  -  I xn--zr8h punycode
Trafalgar: Northerly or northeasterly 4 or 5, increasing 6 or 7 later, perhaps
gale 8 in northeast. Moderate or rough, but slight or moderate in southeast.
Fair. Good.

More information about the TUHS mailing list