#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <sys/shm.h>
#include <sys/stat.h>
#include <sys/mman.h>
//mmap-9-srv.c
int main (int argc, char *argv[]) {
const char* shm_name  = "mymem";
    const int SIZE = 4096;
    const char * message[] = {"Questo ","è un ","esempio di ","shared ","memory","\n"};
    int i, fd;
    void * ptr;
    fd = shm_open(shm_name, O_CREAT | O_RDWR, 0666);
    if(fd==1){
	printf("errore in shm_open\n"); exit(1);
    }

    ftruncate(fd, sizeof(message));
    ptr = mmap(0, SIZE, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
    if (ptr == MAP_FAILED) {
        printf("errore in mmap\n"); exit(1);
    }
/* scrive la stringa in memoria */
    for (i = 0; i < strlen(*message); ++i) {
        sprintf(ptr, "%s", message[i]);
        ptr += strlen(message[i]);
    }
  
    munmap(ptr, SIZE);
    return 0;
}