C - shared memory - dynamic array inside shared struct

Question

i\'m trying to share a struct like this
example:

typedef struct {
    int* a;
    int b;
    int c;
} ex;

between processes, the prob

Answer 1

Convert the struct:

typedef struct {
     int b;
     int c;
     int a[];
} ex;

and then on parent process:

int mid = shmget(key, sizeof(ex) + arraysize*sizeof(int), 0666);

it should work.

In general, it is difficult to work with dynamic arrays inside structs in c, but in this way you are able to allocate the proper memory (this will also work in malloc: How to include a dynamic array INSIDE a struct in C?)