Accesing shm structure using pointer

问题

I have a c structure like this :

struc str{
  int values[10];
}str

In a posix so like fedora i copied this structure to a part of shared memory (shm_open, ftruncate, mmap and memcpy) and I got a pointer to structure from shm. Now how do I change a value in the values array by using this pointer (*ptr).

Imagine i want to do str->values[5] = 10; how to I do that using the pointer.

回答1:

Just use the pointer:

struct str *p = ptr;
p->values[5] = 10;

来源：https://stackoverflow.com/questions/8077884/accesing-shm-structure-using-pointer