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Given knowledge of the prototype of a function and its address in memory, is it possible to call this function from another process or some piece of code that knows nothing but the prototype and memory address? If possible, how can a returned type be handled back in the code?
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Address of a function in C or C++ In C or C++, the variables are stored into memory, so we can get their memory addresses. Similarly, the functions also are stored into the memory, so they also have some addresses.
The & operator is called the reference operator since it gives us a reference to a variable, its memory address.
Address of a function in C or C++ We all know that code of every function resides in memory and so every function has an address like all others variables in the program. We can get the address of a function by just writing the function's name without parentheses. Please refer function pointer in C for details.
On modern operating systems, each process has its own address space and addresses are only valid within a process. If you want to execute code in some other process, you either have to inject a shared library or attach your program as a debugger.
Once you are in the other program's address space, this code invokes a function at an arbitrary address:
typedef int func(void); func* f = (func*)0xdeadbeef; int i = f(); If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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