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Declaring LD_PRELOAD system wide for dynamic loading

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Old 07-24-2009
Declaring LD_PRELOAD system wide for dynamic loading
Dear Fellows;


As being new to linux, i have tried to synamically load a custom library which overrides some system calls like conncet(), socket() etc.... for custom purposes.


It works well, if declaring the environment path LD_PRELOAD and execution of the application to be override are in the same script of perhaps same path as well.


Inshort i am un able to declare the path for dynamic library through LD_PRELOAD system wide, i have tried different ways like saving the LD_PRELOAD path in profile of linux core 9 but it gives error like ..


Unable to load the LD_PRELOAD=./path ...... etc




I would appreciate a concise and swift help, thanking in anticipation.


Regards,


-zeeshan
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LEARN ABOUT CENTOS

ncad_addr

ncad_addr(4)							   File Formats 						      ncad_addr(4)

NAME

       ncad_addr - name of the Solaris Network Cache and Accelerator (NCA) socket utility library

SYNOPSIS

       /usr/lib/ncad_addr.so

DESCRIPTION

       ncad_addr.so is the Solaris Network Cache and Accelerator (NCA) socket utility library. Use this library with a web server to avoid support
       for the PF_NCA family type socket. The web server can take advantage of NCA functionality.

       Interpose the ncad_addr interfaces before the interfaces in libsocket by setting the environment variable  LD_PRELOAD  to  ncad_addr.so	so
       that it is preloaded before libsocket.so.1. The ncad_addr.so interfaces will be interposed only if NCA is enabled. See ncakmod(1).

EXAMPLES

       Example 1: Interposing ncad_addr

       Using Bourne shell syntax as an example, set LD_PRELOAD as shown below to interpose the ncad_addr socket utility libary:

       LD_PRELOAD=/usr/lib/ncad_addr.so /usr/bin/httpd

FILES

       /usr/lib/ncad_addr.so   ncad_addr socket utility library shared object

ATTRIBUTES

       See attributes(5)  for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWncar (32-bit) 	   |
       +-----------------------------+-----------------------------+
       |			     |SUNWncarx (64-bit)	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Unstable			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       nca(1), ncab2clf(1), ncakmod(1), socket(3SOCKET), nca.if(4),  ncakmod.conf(4), attributes(5)

NOTES

       Only applications that use the NCA feature, for example, web servers, should interpose this library.

SunOS 5.10							    18 Feb 2003 						      ncad_addr(4)