<s>
In	O
computing	O
,	O
klibc	B-Language
is	O
a	O
minimalistic	O
subset	O
of	O
the	O
standard	B-Language
C	I-Language
library	I-Language
developed	O
by	O
H	O
.	O
Peter	O
Anvin	O
.	O
</s>
<s>
It	O
was	O
developed	O
mainly	O
to	O
be	O
used	O
during	O
the	O
Linux	B-Application
startup	I-Application
process	I-Application
,	O
and	O
it	O
is	O
part	O
of	O
the	O
early	O
user	B-Operating_System
space	I-Operating_System
,	O
i.e.	O
</s>
<s>
These	O
components	O
do	O
not	O
have	O
access	O
to	O
the	O
standard	O
library	O
(	O
usually	O
glibc	B-Language
or	O
musl	B-Language
)	O
used	O
by	O
normal	O
userspace	B-Operating_System
programs	O
.	O
</s>
<s>
The	O
development	O
of	O
klibc	B-Language
library	O
was	O
part	O
of	O
the	O
2002	O
effort	O
to	O
move	O
some	O
Linux	B-Application
initialization	O
code	O
out	O
of	O
the	O
kernel	O
.	O
</s>
<s>
According	O
to	O
its	O
documentation	O
,	O
the	O
klibc	B-Language
library	O
is	O
optimized	O
for	O
correctness	O
and	O
small	O
size	O
.	O
</s>
<s>
Because	O
of	O
its	O
design	O
,	O
klibc	B-Language
is	O
also	O
technically	O
suitable	O
for	O
embedded	B-Application
software	I-Application
in	O
general	O
on	O
a	O
variety	O
of	O
platforms	O
,	O
and	O
is	O
used	O
even	O
by	O
full-featured	O
programs	O
such	O
as	O
the	O
MirBSD	O
Korn	O
Shell	O
.	O
</s>
<s>
During	O
the	O
Linux	B-Application
startup	I-Application
process	I-Application
,	O
klibc	B-Language
is	O
loaded	O
from	O
within	O
a	O
temporary	O
RAM	B-Application
file	I-Application
system	I-Application
,	O
initramfs	B-Application
.	O
</s>
<s>
It	O
is	O
incorporated	O
by	O
default	O
into	O
initial	O
RAM	O
file	O
systems	O
that	O
are	O
created	O
by	O
the	O
mkinitramfs	O
script	O
in	O
Debian	O
and	O
Ubuntu	B-Operating_System
.	O
</s>
<s>
Furthermore	O
,	O
it	O
has	O
a	O
set	O
of	O
small	O
Unix	O
utilities	O
that	O
are	O
useful	O
in	O
early	O
user	B-Operating_System
space	I-Operating_System
:	O
cpio	B-Application
,	O
dash	B-Operating_System
,	O
fstype	O
,	O
mkdir	B-Application
,	O
mknod	O
,	O
mount	O
,	O
nfsmount	O
,	O
run-init	O
,	O
etc	O
.	O
</s>
<s>
all	O
using	O
the	O
klibc	B-Language
library	O
.	O
</s>
<s>
An	O
alternate	O
strategy	O
is	O
to	O
include	O
everything	O
in	O
one	O
executable	O
,	O
like	O
BusyBox	B-Application
,	O
which	O
determines	O
the	O
requested	O
applet	O
via	O
arguments	O
or	O
hard	O
links	O
or	O
symlinks	B-Application
.	O
</s>
<s>
klibc	B-Language
is	O
dual-licensed	O
under	O
a	O
BSD	O
three-clause	O
(	O
formerly	O
four-clause	O
,	O
rectified	O
via	O
the	O
Historical	B-License
Permission	I-License
Notice	I-License
and	I-License
Disclaimer	I-License
)	O
,	O
as	O
well	O
as	O
the	O
GPLv2	B-License
(	O
GPLv2	B-License
only	O
,	O
due	O
to	O
Linux-kernel	O
restrictions	O
)	O
.	O
</s>
<s>
This	O
dual	O
license	O
allows	O
compatibility	O
with	O
both	O
non-copyleft	O
software	O
,	O
as	O
well	O
as	O
GPLv3	O
programs	O
via	O
the	O
BSD	B-Operating_System
license	I-Operating_System
(	O
which	O
otherwise	O
would	O
not	O
be	O
compatible	O
)	O
.	O
</s>
<s>
(	O
However	O
,	O
if	O
klibc	B-Language
includes	O
any	O
GPLv2	B-License
kernel	O
code	O
such	O
as	O
that	O
in	O
glibc	B-Language
,	O
the	O
entire	O
application	O
reverts	O
to	O
GPLv2	B-License
.	O
)	O
</s>
