#include <stdio.h>
#include <sys/shm.h>
#include <sys/stat.h>

int main()
{
  /* identifier for the shared memory segment */
  int segment_id;
  /* pointer to the shared memory segment */
  char *shared_memory;
  /* size of the shared memory segment */
  const int size = 4096;

  /* allocate a shared memory segment */
  segment_id = shmget(IPC_PRIVATE, size, S_IRUSR|S_IWUSR);

  /* attach the shared memory segment */
  shared_memory = (char *) shmat(segment_id, NULL, 0);

  /* write a message to the shared memory segment */
  sprintf(shared_memory, "EECS 678 Spring 2009 Class");

  /* print string from shared memory */
  printf("%s\n", shared_memory);

  /* detach the shared memory segment */
  shmdt(shared_memory);

  /* remove the shared memory segment */
  shmctl(segment_id, IPC_RMID, NULL);

  return 0;
}