Question

I have a struct that looks like this:

struct data {
  int code;
  char name[25], fnum[8];
};

Then I try to use it as a shared memory like this:

int dataSID = shmget(100002, sizeof(struct data), IPC_CREAT | 0666);

and attach it like this:

struct data *com = shmat(dataSID, 0, 0);

And finally I try filling the values likes this:

(*com).code = 1;
scanf("%s", (*com).name);

And I get segmentation fault on the scanf.

What am I doing wrong?

Does shmat properly allocate memory for the struct?

Answer 1

for character arrays you can always use strcpy() or strncpy(). Of which strncpy() is recommended which helps to avoid buffer overflow.