[Cialug] Select and poll

[Andrew Denner]

I don't have any experience with GhostBSD and limited with BSD in general,
however it would appear that GhostBSD is a derivative of FreeBSD so I would
start there with their documentation (
https://www.freebsd.org/doc/handbook/firewalls.html)

These other postings and commentary would seem to indicate that PF would be
the firewall you want to use:
https://forums.ghostbsd.org/viewtopic.php?t=762 "My Post-installation
Configuration"
https://forums.ghostbsd.org/viewtopic.php?t=976 "is pf firewall installed
in GhostBSD"

Best of luck! Feel free to report back your results, and as always if you
ever make it up this way, you are more than welcome to present on firewall
configuration at one of our monthly meetings...

On Thu, Aug 30, 2018 at 9:08 AM Brian Wood <woodbrian77 at gmail.com> wrote:

> The docs for select() says:
>
>  Under Linux, select() may report a socket file descriptor as
> "ready for reading", while nevertheless a subsequent  read
> blocks.  This could for example happen when data has arrived
> but upon examination has wrong checksum and is discarded.
> There may be other circumstances in which a file descriptor is
> spuriously reported as ready.  Thus it may be safer to use
> O_NONBLOCK on sockets that should not block.
>
> I was thinking that poll() is also similarly afflicted on Linux, but
> the docs for poll() don't mention anything similar.  Does anyone
> know if poll() used to have the problem, but no longer does
> or if it does, but the docs fail to mention it?
>
> I was using poll() in this program:
> https://github.com/Ebenezer-group/onwards/blob/master/src/cmw/tiers/genz.cc
>
> but decided I could do without it recently.  Part of my
> decision was based on thinking that poll() suffered from
> the same problem as select().   This problem with
> select() has existed for years on LInux.  I'm not sure why
> they don't fix it.  FreeBSD doesn't have this problem.
>
> Also would like to mention that I recently learned that
> GhostBSD doesn't have any firewall options apparently.
> Recently I started using GhostBSD and have liked it, but
> even more recently found this out.  One good thing about
> TrueOS is they incorporate a firewall.
>
>
> Brian
> Ebenezer Enterprises - In G-d we trust.
> http://webEbenezer.net
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