<s>
OpenRC	B-Device
is	O
a	O
dependency-based	O
init	B-Operating_System
system	O
for	O
Unix-like	B-Operating_System
computer	B-General_Concept
operating	I-General_Concept
systems	I-General_Concept
.	O
</s>
<s>
It	O
was	O
created	O
by	O
Roy	O
Marples	O
,	O
a	O
NetBSD	B-Device
developer	O
who	O
was	O
also	O
active	O
in	O
the	O
Gentoo	B-Application
project	O
.	O
</s>
<s>
It	O
became	O
more	O
broadly	O
adopted	O
as	O
an	O
init	B-Operating_System
system	O
outside	O
of	O
Gentoo	B-Application
following	O
the	O
decision	O
by	O
some	O
Linux	B-Application
distributions	I-Application
not	O
to	O
adopt	O
systemd	B-Application
.	O
</s>
<s>
OpenRC	B-Device
is	O
the	O
default	O
init	B-Operating_System
system	O
and/or	O
process	B-General_Concept
supervisor	I-General_Concept
for	O
:	O
</s>
<s>
OpenRC	B-Device
is	O
an	O
available	O
init	B-Operating_System
system	O
and/or	O
process	B-General_Concept
supervisor	I-General_Concept
for	O
:	O
</s>
<s>
OpenRC	B-Device
is	O
made	O
up	O
of	O
several	O
modular	O
components	O
,	O
the	O
main	O
ones	O
being	O
an	O
init	B-Operating_System
(	O
optional	O
)	O
,	O
the	O
core	O
dependency	O
management	O
system	O
and	O
a	O
daemon	O
supervisor	O
(	O
optional	O
)	O
.	O
</s>
<s>
It	O
is	O
written	O
in	O
C	B-Language
and	O
POSIX-compliant	O
shell	O
,	O
making	O
it	O
usable	O
on	O
BSD	O
and	O
Linux	B-Application
systems	O
.	O
</s>
<s>
The	O
core	O
part	O
of	O
OpenRC	B-Device
handles	O
dependency	O
management	O
and	O
init	B-Operating_System
script	O
parsing	O
.	O
</s>
<s>
OpenRC	B-Device
works	O
by	O
scanning	O
the	O
runlevels	O
,	O
building	O
a	O
dependency	O
graph	O
,	O
then	O
starting	O
the	O
needed	O
service	O
scripts	O
.	O
</s>
<s>
By	O
default	O
,	O
OpenRC	B-Device
uses	O
a	O
modified	O
version	O
of	O
start-stop-daemon	O
for	O
daemon	O
management	O
.	O
</s>
<s>
Init	B-Operating_System
scripts	O
share	O
similarities	O
with	O
scripts	O
used	O
in	O
sysvinit	O
,	O
but	O
offer	O
several	O
features	O
to	O
simplify	O
their	O
creation	O
.	O
</s>
<s>
The	O
depend	O
function	O
is	O
used	O
to	O
declare	O
dependencies	O
to	O
other	O
services	O
that	O
would	O
be	O
done	O
with	O
LSB	B-Application
headers	O
in	O
sysvinit	O
.	O
</s>
<s>
Configuration	O
and	O
mechanism	O
are	O
separated	O
with	O
configuration	O
files	O
in	O
the	O
conf.d	O
directory	O
and	O
init	B-Operating_System
files	O
in	O
the	O
init.d	O
directory	O
.	O
</s>
<s>
Openrc-init	O
first	O
appeared	O
in	O
version	O
0.25	O
as	O
an	O
optional	O
replacement	O
for	O
.	O
</s>
<s>
Several	O
other	O
inits	B-Operating_System
are	O
supported	O
,	O
including	O
sysvinit	O
and	O
Busybox	B-Application
.	O
</s>
<s>
Supervise-daemon	O
first	O
appeared	O
in	O
version	O
0.21	O
giving	O
OpenRC	B-Device
supervision	O
capabilities	O
.	O
</s>
<s>
It	O
can	O
be	O
enabled	O
in	O
the	O
init	B-Operating_System
script	O
for	O
supervise-daemon	O
to	O
start	O
and	O
monitor	O
a	O
daemon	O
.	O
</s>
<s>
Several	O
other	O
daemon	O
supervisors	O
are	O
supported	O
,	O
including	O
runit	B-Device
and	O
s6	O
.	O
</s>
<s>
Stateful	O
init	B-Operating_System
scripts	O
(	O
is	O
it	O
started	O
already	O
?	O
)	O
</s>
<s>
Expressive	O
and	O
flexible	O
network	O
handling	O
(	O
including	O
VPN	B-Application
,	O
bridges	O
,	O
etc	O
.	O
)	O
</s>
