turul16

//
// Mielott futatnad
// dd if=/dev/zero of=mmap bs=1M count=1k
// make mmaper
// ./mmaper # Na mot nezeged a topot, us entert, hogy lass mozgast
//  erdemes VIRT szerint rendezni shift+F o

#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/mman.h>
#include <stdio.h>
int main()
{
    int fd;
    struct stat s;
    off_t c;
    int sum=42;
    char* addr;
    fd=open ("mmap", O_RDONLY);
    fstat(fd,&s);
    addr=(char*) mmap(NULL,s.st_size, PROT_READ,MAP_PRIVATE,fd,0);
    if (addr==(void*)-1)
    {
        fprintf(stderr,"fuck");
        return 1;
    }
    getchar();
    for (c=0;c<s.st_size;c+=4096)
    {
        sum+=addr[c];
    }
    printf("%d\n",sum);
    getchar();
    return 0;
}