fcntl(2) lock on /dev/null fails with EINVAL

Matthew Dillon dillon at backplane.com
Sat Jul 25 19:38:39 PDT 2015

I dunno about allowing lockf on /dev/null.  Any process can open /dev/null,
it isn't unique to whatever you are testing and there could easily be
unintended consequences.  Linux does support it but I dunno how good an
idea that is.


On Fri, Jul 17, 2015 at 12:57 PM, Steffen Nurpmeso <sdaoden at yandex.com>

> ..and so here is a tiny manual update.
> Just noting that locking succeeds on at least (my outdated) Snow
> Leopard and i like that since /dev/null is the only sane, always
> available option to foist something NULLy into whatever.
> I.e., i use it to be able to have an available NULL mailbox for
> the test (suite is a wording too strong, still).  Yes, it is
> because the BSD Mail codebase i'm sitting upon still doesn't have
> it own VOID object that can be addressed directly.
> --steffen
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