Hi, I inserted a shared library(say 1.so) inside a running process(say mutatee) . I did not use dlopen() function for this. The shared library(1.so) contains dlopen() function ie) it depends on libdl.so. The problem is when I tried to call dlopen() function which is inside the shared library(1.so) the mutatee is getting crashed. When I call dlopen() with file="" , the mutatee is not getting crashed, but when I give any other filename it is getting crashed. What could be the reason. General questions about dlopen(). 1) In which section dlopen() inserts a library. Inside heap or text or data section??? How to know whether dlopen() has permissions for that section? 2) I want to debug dlopen() function to know where it is getting crashed. I dont have gdb on my machine(armv5-linux). Where can I download libdl.so souce code???...so that I will comiple it for arm and insert my own printf() statements inside it. Thanks in advance.