Re: dlz-bdbhpt-dynamic - a dlopen bdbhpt DLZ driver

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Hi Jan-Piet,

On 16 July 2012 19:18, Jan-Piet Mens <[email protected]> wrote:

> > Over the weekend I've taken it upon myself to write up a dlopen() capable
> > bdbhpt DLZ driver.
>
> That looks pretty slick.
>

Thanks :-) I'm hoping it ends up being useful.


> I can't for the life of me link the module, though. I'm running on OS/X
> 10.6 and both DLZ example (from BIND 9.9.1-P1 contrib) and my own [1]
> link fine with dlz-minimal (V2).
>
> |   cc -fPIC -g -I. -I/usr/local/BerkeleyDB.4.7/include -shared -o \
> |        dlz_bdbhpt_dynamic.so dlz_bdbhpt_dynamic.c \
> |        -L/usr/local/BerkeleyDB.4.7/lib -ldb
> |   Undefined symbols:
> |     "_dns_sdlz_putnamedrr", referenced from:
> |         _dlz_allnodes in ccHsui8i.o
> |     "_dns_sdlz_putrr", referenced from:
> |         _dlz_lookup in ccHsui8i.o
> |   ld: symbol(s) not found
>
> This must be due to lack of morning coffee...
>

The missing symbols your linker is complaining about are internal ones
generated by the compiler?  Those particular symbols appear to be ones
within the source proceeded by _.

I suspect this is coming about because I'm building the shared object in
one go, and not building the plain object file first.

>From your Makefile:

dlz_lua.so: dlz_lua.o
        $(CC) $(CFLAGS) -shared -o dlz_lua.so dlz_lua.o -L$(LUA) -llua

note the lack of dlz_lua.o definition though.  Where-as from mine:

dlz_bdbhpt_dynamic.so:
        $(CC) $(CFLAGS) -shared -o dlz_bdbhpt_dynamic.so
dlz_bdbhpt_dynamic.c $(BDB_LIBS)

Could you try modifying the Makefile to be:

dlz_bdbhpt_dynamic.so: dlz_bdbhpt_dynamic.o
        $(CC) $(CFLAGS) -shared -o dlz_bdbhpt_dynamic.so
dlz_bdbhpt_dynamic.c $(BDB_LIBS)

to see whether that makes any difference for you?

> * This provides the externally loadable bdbhpt DLZ driver, without
> > * update support
>
> Now, about the last bit of that comment in the source... ;-)
>

Well yes, a working read-only implementation to start with is my first
goal.  If this goes well I may try my hand against some of the other
drivers.

Thanks,
Mark.

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Hi Jan-Piet,<br><br><div class=3D"gmail_quote">On 16 July 2012 19:18, Jan-P=
iet Mens <span dir=3D"ltr">&lt;<a href=3D"mailto:[email protected]" targ=
et=3D"_blank">[email protected]</a>&gt;</span> wrote:<br><blockquote cla=
ss=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;pa=
dding-left:1ex">
<div class=3D"im">&gt; Over the weekend I&#39;ve taken it upon myself to wr=
ite up a dlopen() capable<br>
&gt; bdbhpt DLZ driver.<br>
<br>
</div>That looks pretty slick.<br></blockquote><div><br></div><div>Thanks :=
-) I&#39;m hoping it ends up being useful.</div><div>=A0</div><blockquote c=
lass=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;=
padding-left:1ex">

I can&#39;t for the life of me link the module, though. I&#39;m running on =
OS/X<br>
10.6 and both DLZ example (from BIND 9.9.1-P1 contrib) and my own [1]<br>
link fine with dlz-minimal (V2).<br>
<br>
| =A0 cc -fPIC -g -I. -I/usr/local/BerkeleyDB.4.7/include -shared -o \<br>
| =A0 =A0 =A0 =A0dlz_bdbhpt_dynamic.so dlz_bdbhpt_dynamic.c \<br>
| =A0 =A0 =A0 =A0-L/usr/local/BerkeleyDB.4.7/lib -ldb<br>
| =A0 Undefined symbols:<br>
| =A0 =A0 &quot;_dns_sdlz_putnamedrr&quot;, referenced from:<br>
| =A0 =A0 =A0 =A0 _dlz_allnodes in ccHsui8i.o<br>
| =A0 =A0 &quot;_dns_sdlz_putrr&quot;, referenced from:<br>
| =A0 =A0 =A0 =A0 _dlz_lookup in ccHsui8i.o<br>
| =A0 ld: symbol(s) not found<br>
<br>
This must be due to lack of morning coffee...<br></blockquote><div><br></di=
v><div>The missing symbols your linker is complaining about are internal on=
es generated by the compiler? =A0Those particular symbols appear to be ones=
 within the source=A0proceeded=A0by _.</div>
<div><br></div><div>I suspect this is coming about because I&#39;m building=
 the shared object in one go, and not building the plain object file first.=
</div><div><br></div><div>From your Makefile:=A0</div><br><font face=3D"cou=
rier new, monospace">dlz_lua.so: dlz_lua.o<br>
=A0 =A0 =A0 =A0 $(CC) $(CFLAGS) -shared -o dlz_lua.so dlz_lua.o -L$(LUA) -l=
lua</font></div><div class=3D"gmail_quote"><br>note the lack of dlz_lua.o d=
efinition though. =A0Where-as from mine:</div><div class=3D"gmail_quote"><b=
r></div><div class=3D"gmail_quote">
<div class=3D"gmail_quote"><font face=3D"courier new, monospace">dlz_bdbhpt=
_dynamic.so:</font></div><div class=3D"gmail_quote"><font face=3D"courier n=
ew, monospace">=A0 =A0 =A0 =A0 $(CC) $(CFLAGS) -shared -o dlz_bdbhpt_dynami=
c.so dlz_bdbhpt_dynamic.c $(BDB_LIBS)</font></div>
<div><br></div><div>Could you try modifying the Makefile to be:</div><div><=
br></div><div><div class=3D"gmail_quote"><font face=3D"courier new, monospa=
ce">dlz_bdbhpt_dynamic.so: dlz_bdbhpt_dynamic.o</font></div><div class=3D"g=
mail_quote">
<font face=3D"courier new, monospace">=A0 =A0 =A0 =A0 $(CC) $(CFLAGS) -shar=
ed -o dlz_bdbhpt_dynamic.so dlz_bdbhpt_dynamic.c $(BDB_LIBS)</font></div></=
div><div>=A0</div><div>to see whether that makes any difference for you?</d=
iv><div>
<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;bord=
er-left:1px #ccc solid;padding-left:1ex">&gt; * This provides the externall=
y loadable bdbhpt DLZ driver, without<br>
&gt; * update support<br>
<br>
Now, about the last bit of that comment in the source... ;-)<br></blockquot=
e><div><br></div><div>Well yes, a working read-only implementation to start=
 with is my first goal. =A0If this goes well I may try my hand against some=
 of the other drivers.</div>
<div><br></div><div>Thanks,</div><div>Mark.=A0</div></div>

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