I want to get the return address of the caller function. I’m using __builtin_return_address() funtion, but if I give index value greater than 0 it is returning NULL.
Please help me with this or tell me any other function to get the same.
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Answer
See this answer to a related question.
__builtin_return_address is GCC and processor specific (also available in some versions of Clang on some processors with some -lack of- optimizations), and documented as
On some machines it may be impossible to determine the return address of any function other than the current one
The compiler might optimize a function (e.g. when it is compiled with -fomit-frame-pointer, or for tail-calls, or by function inlining) without the relevant information.
So probably you are getting NULL because the information is not available!