Thread: Problem with shared memory

I'm trying to use shared memory. So far I have

Code:

#include <sys/ipc.h>
#include <sys/shm.h>
#include <sys/types.h>
#include <unistd.h>
#include <semaphore.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define MAX_PATH_LEN 1024
#define ARRAY_SIZE 50

typedef struct _task{
	char path [MAX_PATH_LEN];
	char thread_id[MAX_PATH_LEN];
	char op;
	int index;
}task;

typedef struct _sharedMem{
	int lastIn;
	int numTasks;
	sem_t mutex;
	int size;
	task array [ARRAY_SIZE];
}sharedMem;

int main(void){
	int i;
	int id = shmget(1234, sizeof(sharedMem), IPC_CREAT|0777);
	sharedMem* shMem = shmat(id, NULL, 0);
	printf("init 1\n");
	shMem->lastIn = 0;
	printf("init 2\n");
	shMem->numTasks = 0;
	printf("init 3\n");
	sem_init(&(shMem->mutex), 0, 1);
	printf("init 4\n");
	shMem->size = ARRAY_SIZE;
	for(i = 0; i < shMem->size; i++){
		strcpy(shMem->array[i].path, " ");
	}
	return 1;
}

The output for this is

Code:

init 1
Segmentation fault

I have no idea why. Do we have to do something to the structure before start using it?
If so what?