How to chang the environment of running process in C?

Hi All,
I have a application written in C ( OS Solaris 10 ) actually this application runs under some pre defined and standardised environment (specific to my project ).
Now I have requirement to access API of a library( already existing code ) in my application to perform some operations. I need to enhance my C code.
This API ( or library ) is not compatible with the standardised environment set for my application.(standardised environment (specific to my project ))
Can anybody please suggest me how can I set the environment (compatible to the library)while using that API (or library ) and reset to my project specific environment after the result is obtained from the new API (library ).
To be more specific during execution of my C-Application ( Environment variable LD_PRELOAD=/usr/lib/secure/libmtmalloc.so ). I am enhancing my application to use PAM Modules ( Pluggable Authentication Modules ) PAM APIs exposed performs internally some operation and return some values to me.But inside the PAM my application is crashing during malloc operation.
I have written a test application when it uses PAM APIs and perform the same operation under normal enviroment (uses libc for memory related function) it works fine.
So please tell me how can I set this environment variable LD_PRELOAD to libc only during execution of this API and revert this environment variable LD_PRELOAD back to libmtmalloc after it performs this operation is done.
Please dont tell me about the bug with libmtmalloc.so instead please provide me with some programming solution to achieve this.
Thanks alot in advance.
Regards,
Rahul.

rahulsingh wrote:
*What do you mean "linked"? libC is dynamic (run-time) object. So your
library will be linked with the necessary items at runtime. If mtmalloc
is preloaded, then it may well use the mtmalloc routines.*
By linked I mean if I that library(libraryA) during compilations process it is linked to libC ( -lC). No, that doesn't normally happen at compile time. It might check the library to see what functions are in it, but it doesn't actually take sections of libC and place them in the library.
Instead, the run-time linker places both your library and libC (and the app, and other dynamic libraries) in memory when the app is run. LD_LIBRARY_PATH and LD_PRELOAD both affect the run-time linker in where and how it will look for libraries to load. You can see where it resolves by using 'ldd' on the app.
This will show dynamic libraries that were required at compilation time. It is also possible for an application to explicitly grab a library via 'dlopen'. Any such files will not appear in 'ldd' output.
Darren

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