This is my lab report on 11/11:

   1. Using STORE through a pointer.
 
           #define STORESIZE 12
           #define STOREIDSIZE 9
           #define STORELEMSIZE 10

           typedef char storeid[STOREIDSIZE];
           typedef char storeelem[STORELEMSIZE];

           typedef struct {
                storeid id;
                storeelem elem; }  storepair;
   
           typedef storepair storetype[STORESIZE];

           storetype * storeptr;

           void storeinit();

           int main() {
                 
                // Get shmid using shmget or from the file "segid.dat".

                   storeptr = (storetype *) shmat (shmid, 0, 0);
                   storeinit();
                   printf("id of the second entry:%s\n", storeptr[1]->id);
                   exit(0);
              }

           void storeinit(0 {
                   strcpy(storeptr[0]->id, "123456789");
                   strcpy.......
                             }


      2. Example of unlinking an existing file:

            #include <sys/type.h>
            #include <sys/stat.h>
            #include <fcntl.h>
            #include <stdio.h>

            int main() {

               if (open("tempfile", O_RDWR) < 0)
                       { 
                         perror("Open error!");
                         exit(1);
                         }

               if (unlink("tempfile") < 0)
                       {
                         perror("Unlink error!");
                         exit(1);
                        }

               printf ("File unlinked!\n");
                  
            }

      3.  NOTE:

            If you have some shared memory segments not deleted after 
            running the program, you must use the shell level command
            ipcs and ipcrm to remove them.