<s>
Direct	B-Operating_System
binding	I-Operating_System
is	O
a	O
feature	O
of	O
the	O
linker	B-Application
and	O
dynamic	B-Application
linker	I-Application
on	O
Solaris	B-Application
and	O
OpenSolaris	B-Operating_System
.	O
</s>
<s>
It	O
provides	O
a	O
method	O
to	O
allow	O
libraries	O
to	O
directly	O
bind	O
symbols	O
to	O
other	O
libraries	O
,	O
rather	O
than	O
weakly	O
bind	O
to	O
them	O
and	O
leave	O
the	O
dynamic	B-Application
linker	I-Application
to	O
figure	O
out	O
which	O
library	O
contains	O
the	O
symbol	O
.	O
</s>
<s>
When	O
linking	B-Application
a	O
shared	O
library	O
or	O
dynamic	O
linked	O
executable	O
,	O
the	O
linker	B-Application
normally	O
populates	O
the	O
symbol	B-Application
table	I-Application
for	O
that	O
library	O
with	O
all	O
required	O
symbols	O
.	O
</s>
<s>
Unresolved	O
symbols	O
must	O
still	O
be	O
known	O
at	O
link	O
time	O
,	O
but	O
the	O
linker	B-Application
is	O
passed	O
shared	O
libraries	O
to	O
link	O
with	O
and	O
,	O
when	O
it	O
finds	O
a	O
symbol	O
in	O
another	O
library	O
,	O
it	O
places	O
a	O
note	O
in	O
the	O
output	O
library	O
indicating	O
that	O
it	O
depends	O
on	O
these	O
other	O
shared	O
libraries	O
.	O
</s>
<s>
This	O
kind	O
of	O
weak	O
linking	B-Application
forces	O
the	O
dynamic	B-Application
linker	I-Application
to	O
resolve	O
which	O
library	O
contains	O
which	O
symbol	O
when	O
the	O
executable	O
is	O
run	O
.	O
</s>
<s>
The	O
dynamic	B-Application
linker	I-Application
on	O
Linux	O
,	O
for	O
example	O
,	O
reads	O
through	O
the	O
DT_NEEDED	O
section	O
of	O
an	O
ELF	O
object	O
and	O
loads	O
needed	O
libraries	O
;	O
but	O
is	O
n't	O
told	O
where	O
required	O
symbols	O
are	O
.	O
</s>
<s>
Direct	O
linking	B-Application
works	O
around	O
this	O
problem	O
by	O
storing	O
an	O
equivalent	O
list	O
of	O
pointers	O
to	O
DT_NEEDED	O
entries	O
in	O
a	O
separate	O
ELF	O
section	O
.	O
</s>
<s>
This	O
allows	O
the	O
linker	B-Application
to	O
locate	O
the	O
library	O
specified	O
by	O
a	O
particular	O
DT_NEEDED	O
entry	O
and	O
check	O
only	O
its	O
symbol	B-Application
table	I-Application
for	O
each	O
symbol	O
,	O
rather	O
than	O
iterate	O
through	O
potentially	O
every	O
library	O
for	O
every	O
symbol	O
.	O
</s>
