get address space of my prog during runtime?

Thinking · 05-16-2005, 03:23 PM

hiho@ll

i just wanted to know if it's possible to know during runtime of my programm where the heap is located or the stack ...

i wanted to write a prog, which allocates an array (or use any variable) and the pointer variable tells me where it is located (in heap, data, bss)

i know most times it's not really necessary to control such stuff
but i just wanted to know how it works, if it works

so, how can i resolve the address space of my program? and is it possible?

thx@ll

djgerbavore · 05-16-2005, 03:29 PM

i'm not sure about the heap but the stack you can (with x86 arch)

Code:

/* prints the top of the top */
unsigned long get_sp(void) {
     __asm__("movl %esp, %eax");
}
void main() {
    printf("0x%x", get_sp()) ;
}

you can play around with other registers and see what you get, let me know if that helps

djgerbavor3

itsme86 · 05-16-2005, 04:54 PM

sbrk(0) will return the upper heap address.