Reading Garbage with shmget - c

Question

I have created two processes. One of them creates a shared memory chunk and the other tries to read it. There are no compilation errors with this code but somehow Process 2 behaves weird.
Process 1:
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/shm.h>
#include <sys/sem.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <signal.h>
#define nDEVICES 3
#define DEVICE_NAME_LIMIT 20
typedef struct d_list
{
char d_name[DEVICE_NAME_LIMIT];
int d_id;
}device_mapping;
int main()
{
key_t shared_memkey_D=ftok(".", 'D');
int shared_memid_D=shmget(shared_memkey_D, nDEVICES*sizeof(device_mapping), 0777|IPC_CREAT|IPC_EXCL);
device_mapping *DEVICES = (device_mapping*)shmat(shared_memid_D,0,0);
strcpy(DEVICES[0].d_name, "DISK");
strcpy(DEVICES[1].d_name, "PORT");
strcpy(DEVICES[2].d_name, "PRINTER");
DEVICES[0].d_id=1;
DEVICES[1].d_id=3;
DEVICES[2].d_id=2;
}
Process 2:
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/shm.h>
#include <sys/sem.h>
#include <signal.h>
#define nDEVICES 3
#define DEVICE_NAME_LIMIT 20
typedef struct d_list
{
char d_name[DEVICE_NAME_LIMIT];
int d_id;
}device_mapping;
int main()
{
key_t shared_memkey_D=ftok(".", 'D');
int shared_memid_D=shmget(shared_memkey_D, nDEVICES*sizeof(device_mapping), 0777);
device_mapping *DEVICES = (device_mapping*)shmat(shared_memid_D,0,0);
int i=0;
for (i=0; i<nDEVICES; i++)
printf("%s\t%d\n", DEVICES[i].d_name, DEVICES[i].d_id);
}
Process 2 is reading all garbage and I cannot figure out what is going wrong after several attempts. Please help.
EDIT:
I had copied the wrong program here. I have made the corrections. Its still giving me garbage.
Process 2 prints the following:
DISK 11038
?FG+ 3
#?FG+ 2

Answer 1

/* process 1 */
typedef struct d_list
{
char d_name[DEVICE_NAME_LIMIT];
int d_id;
}device_mapping;
and
/* process 2 */
typedef struct d_list
{
char * d_name;
int d_id;
}device_mapping;
are not the same.
Change device_mapping definition for process 2 to be the same as for process 1, using characters arrays but character pointers.
For process 1 d_name uses DEVICE_NAME_LIMIT bytes, for process 2 d_name uses 4 bytes (32bit) or 8 bytes (64bit).
I'd put the common structure definitions into a shared header file, which is included by both pocesses' sources.