CODEWITHSUNDEEP
cpointerscastingfreesigabrt
Edwin Skeevers
Edwin Skeevers

Reputation: 319

C void pointer casting

typedef struct{
    void *val;
}struct_t;

void test(int val)
{
    struct_t *s = malloc(sizeof(struct_t));

    s->val = malloc(sizeof(int));

   *(int*)&s->val = val;

    free(s->val);
}

The free generates a sigabrt but I think that's more just a symptom of the way that I'm casting s->val to get the assignment to work. What's the proper way to perform this assignment?

Upvotes: 1

Views: 169

Answers (1)

MK.
MK.

Reputation: 34527

 *(int*)&s->val = val;

Says "take the address of the field val in struct s and change write "val" into it. This makes s->val point to address stored in argument of test "val". What you meant is 

*(int*)s->val = val;

Upvotes: 7

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