<s>
In	O
Linux	B-Application
,	O
FreeBSD	B-Operating_System
,	O
NetBSD	B-Device
or	O
the	O
always	O
full	O
device	O
,	O
is	O
a	O
special	B-Application
file	I-Application
that	O
always	O
returns	O
the	O
error	O
code	O
(	O
meaning	O
"	O
No	O
space	O
left	O
on	O
device	O
"	O
)	O
on	O
writing	O
,	O
and	O
provides	O
an	O
infinite	O
number	O
of	O
zero	O
bytes	O
to	O
any	O
process	B-Operating_System
that	O
reads	O
from	O
it	O
(	O
similar	O
to	O
)	O
.	O
</s>
<s>
Support	O
for	O
the	O
always-full	O
device	O
in	O
Linux	B-Application
is	O
documented	O
as	O
early	O
as	O
2007	O
.	O
</s>
<s>
Native	O
support	O
was	O
added	O
to	O
FreeBSD	B-Operating_System
in	O
the	O
11.0	O
release	O
in	O
2016	O
,	O
which	O
had	O
previously	O
supported	O
it	O
through	O
an	O
optional	O
module	O
called	O
lindev	O
.	O
</s>
<s>
The	O
full	O
device	O
appeared	O
in	O
NetBSD	B-Device
8	O
.	O
</s>
