message.h

#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/sem.h>
#include <sys/shm.h>
#include <stdio.h>

#define PERMS   0666

#define MSG_TYPE_EMPTY  0
#define MSG_TYPE_STRING 1
#define MSG_TYPE_FINISH 2
#define MAX_STRING      120

typedef struct {
  int type;
  int n;
} message_t;