libdl - Library gives you this opportunity. For example:
* If you are writing an application which makes use of XML Parsing Library sparingly. You may want to load this XML Library when there is need and unload it afterwards.
* Or, you may want to load choose a particular library depending on the runtime parameters of an application.
libdl comes in handy, with only 3 interfaces with in the library. The following functions are defined in "dlfcn.h".
* dlopen - gain access to an executable object file
* dlsym - obtain the address of a symbol from a dlopen object
* dlclose - close a dlopen object
* dlerror - dlerror - get diagnostic information
int *iptr, (*fptr)(int);
/* open the needed object */
handle = dlopen("/usr/home/me/libfoo.so", RTLD_LOCAL | RTLD_LAZY);
/* find the address of function and data objects */
*(void **)(&fptr) = dlsym(handle, "my_function");
iptr = (int *)dlsym(handle, "my_object");
/* invoke function, passing value of integer as a parameter */
Don't forget to set the LD_LIBRARY_PATH.