Question

Alright here’s the code:

//in another file

void **ptr; ptr = kmalloc(sizeof(void *) * 2);

  *(ptr+0) = tf; //type trapframe *
  *(ptr+1) = as; //type addrspace *

func(*ptr); 

And here is that function:

void func(void *ptr) {

struct trapframe *parentTF = ptr[0];
struct addrspace *newAS = ptr[1]; 
//now I wanna do stuff with parentTF and newAS

}

And the error I get is:

warning: dereferencing `void *' pointer

Thanks for any help.

Answer 1

If I’m correctly understanding what you’re trying to do, it seems like you need to change this:

void func(void *ptr) {

to this:

void func(void **ptr) {

and this:

func(*ptr);

to this:

func(ptr);

Note that *(ptr+0) and ptr[0] are synonymous, as are *(ptr+1) and ptr[1].