topic Re: patch for libdld in Operating System - Linux

patch for libdld

Saritha_1 — Fri, 21 Oct 2005 05:55:34 GMT

Hi,

We are facing the webserver starting issue after deploying few web application. We have libsasl library which have dlopen defined in it , which intern has shl_load call and this shl_load is getting null input in one of its argument.
Now we want that our webserver should use the dlopen defined in system libraries like in libdld.

Please suggest is there any way we can bypass dlopen function of our library and let system library do that task.

Is there any libdld patch we can check for as we found same webserver working fine on some other machine.

All suggestion are welcome.
Looking forward for reply

Thanks,
Varun

Re: patch for libdld

Arunvijai_4 — Fri, 21 Oct 2005 06:07:26 GMT

I guess it is 11.11, this is a latest patch PHSS_33033, http://www1.itrc.hp.com/service/patch/patchDetail.do?BC=patch.breadcrumb.main|patch.breadcrumb.search|&patchid=PHSS_33033&context=hpux:800:11:11

-Arun

Re: patch for libdld

Stephen Keane — Fri, 21 Oct 2005 06:24:18 GMT

The version of dlopen() used will depend on how the executable was linked. The first external symbol found matching the pattern for dlopen() will be linked in. The order the libraries is linked is important. I don't know whether that helps you, especially if you can't relink the executable.

Re: patch for libdld

ranganath ramachandra — Sat, 29 Oct 2005 00:15:27 GMT

you can either alter the linkline so that libdld appears precedes libsasl in the linkline:

cc ... -ldld ... -lsasl
or
ld ... -ldld ... -lsasl

or use LD_PRELOAD/LD_PRELOAD_ONCE at runtime:

env LD_PRELOAD=/usr/lib/libdld.sl ./server

the first approach is recommended.

dlopen is available in 11.11/11.23 libdld. please use the latest linker/loader patches PHSS_33032(11.00)/PHSS_33033(11.11)/PHSS_33349(11.23).