Relative pointers in a memory mapped file using C

Question

Is it possible to use a structure with a pointer to another structure inside a file with memory mapping instead of storing the offset in some integral type and calculating the pointer?

eg. given the following structure:

typedef struct _myStruct_t {
  int number;
  struct _myStruct_t *next;
} myStruct_t;
myStruct_t* first = (myStruct_t*)mapViewHandle;
myStruct_t* next = first->next;

instead of this:

typedef struct _myStruct_t {
  int number;
  int next;
} myStruct_t;
myStruct_t* first = (myStruct_t*)mappedFileHandle;
myStruct_t* next = (myStruct_t*)(mappedFileHandle+first->next);

I read about the '__based' keyword, but it is specific to Microsoft and therefore related to Windows.

Looking for something that works with the GCC compiler.

Answer 1

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Answer 2

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. myStruct_t, next , (, myStruct_t* b )

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- number b->next th .

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