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

#define SHMSZ     27
#define KEY     5625
#define PERM     0600


void scrivi(void) {

    int indirizzo = 0;
	
    char c;
    int shmid;
    key_t key;
    char * shm, * s, * res;
    char str[80];
    int i;
    
    printf("Inserisci indirizzo.\n");
    scanf("%d",&indirizzo);
    printf("Indirizzo: %d \n",indirizzo);
    
    
    //key = KEY;
    key = (key_t)indirizzo;

    /*
     * Create the segment.
     */
    if ((shmid = shmget(key, SHMSZ, IPC_CREAT | PERM)) < 0) {
      perror("shmget");
      exit(1);
    }

    /*
     * Now we attach the segment to our data space.
     */
    if ((shm = shmat(shmid, NULL, 0)) == (char * ) - 1) {
      perror("shmat");
      exit(1);
    }
    
    res = getpass("password:");
    
    s = shm;
    int j = strlen(res);
    for (i = 0; i <= j; i++)
      * s++ = * res++;
    * s = NULL;
    
   printf("Scrittura terminata.\n");
   
   exit(0);
  }

void cancella(void) {
	
    int indirizzo = 0;
    
    int shmid;
    key_t key;
    char *shm, *s;
    struct shmid_ds * shmid_ds;
    int rtrn;
    
    printf("Inserisci indirizzo (x per usare il default).\n");
    rtrn = scanf("%d",&indirizzo);
    if(rtrn!=0) {
    	printf("Indirizzo: %d \n",indirizzo);
    	key = (key_t)indirizzo;
    }
    else {
    	printf("Indirizzo: %d \n",KEY);
    	key = KEY;
    }

    /*
     * Locate the segment.
     */
    if ((shmid = shmget(key, SHMSZ, PERM)) < 0) {
        perror("shmget");
        exit(1);
    }

    /*
     * Now we attach the segment to our data space.
     */
    if ((shm = shmat(shmid, NULL, 0)) == (char *) -1) {
        perror("shmat");
        exit(1);
    }
   
    

    if ((rtrn = shmctl(shmid, IPC_RMID, shmid_ds)) == -1) {
      perror("shmctl");
      exit(1);
    }

    printf("Dati cancellati.\n");
    exit(0);

}

main(int argc, char * argv[]) {
// int i;                                                      																																																				
//                                                             																																																				
// printf("argc = %d\n", argc);                                																																																				
//                                                             																																																				
// for (i = 0; i < argc; i++)                                  																																																				
//   printf("argv[%d] = \"%s\"\n", i, argv[i]);                																																																				
//                                                             																																																				
// if ((argc!=2) ||                                            																																																				
//     ((argc==2) && (argv[1][0]!='s') && (argv[1][0]!='c'))) {																																																				
//   printf("Usage: shm_server [s|c]\n");                      																																																				
// }                                                           																																																				
// else {                                                      																																																				
//   printf("1\n");                                            																																																				
//    if (argv[1][0] == 's')                                   																																																				
//        scrivi();                                            																																																				
//    else {                                                   																																																				
//     printf("2\n");                                          																																																				
//      cancella();                                            																																																				
//    }                                                        																																																				
// }
  cancella();
}