#include <sys/ipc.h>
#include <sys/shm.h>
#include <stdlib.h>
#define SHMSZ  27
main()
{
  char c, *shm, *s;
  int chave= 5678, shmid;

  shmid= shmget(chave, SHMSZ, 0666);
  shm= (char *)shmat(shmid, NULL, 0);

  for (s=shm; *s!='\0'; s++) /* lę da memória partilhada*/
    putchar(*s);
  putchar('\n');
  *shm='*';        /* alterar o 1o. caracter em memória */
  exit(0);
}