Is there any to know which has called my function

[maheshgupta024]

Hi all,
can anyone tell me the way to know which function has called my function, i.e., I want to know the calling function name in my function. Is there any predefined macro like __FUNCTION__ to know the called function

Thanks in Advance

[donbock]

The C Standard doesn't provide any portable way to do it.

If you have an intimate knowledge of how your compiler and processor manage the stack it can be possible to write a nonportable function that unwinds the call stack to find the address from whence its caller was called. This is not quite the same thing as what you're asking for.

[weaknessforcats]

The easiest thing to do is learn how to use your debugger.

Every professional quality debugger has the ability to display the call stack. Not only can you see the line of code that called your function, you can also see the line of code that called the function that called your function right back to the operating system calling your main().

[Savage]

Do you mean something like this:

void PrintInfo(char *Caller,char *Func)
{
    printf("Caller:%s \t Func:%s",Caller,Func);
}
 
#define CALL(FUNCTION,RET,...){PrintInfo(__FUNCTION__,#FUNCTION);RET=FUNCTION(__VA_ARGS__);}
 
It's used like this:
 
int Sum(int a,int b,int c)
{
    return a+b+c;
}
 
void DoWork()
{
    int ret=0;
 
    CALL(Sum,ret,10,15,20);
 
    printf("\nSum: %d \n",ret);
}

?

So how does this macro works:

This macro uses previously defined function to print(or store info for later use which is what you want to do ).Parameters for that functions are __FUNCTION__ which is the calling function,and second parameter is made by using the preprocessor tokenizer which turns the called function name into a string using the # operator.
Then it calls the function storing the return value if any in RET and passing the variable argument list to it.(Separate macro needed for void functions)

[maheshgupta024]

#define CALL(FUNCTION,RET,...){PrintInfo(__FUNCTION__,#FUN CTION);RET=FUNCTION(__VA_ARGS__);}

Thanks Savage.. Im looking to get a macro like this.. This will be good input for me.