C / C++ / MFC

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/stat.h>
#include <sys/mman.h>

int main(int argc, const char * argv[])
{
    unsigned char     *data;
    unsigned char     *mmapdata;
    size_t            length;

    int file = open("address", O_RDONLY);
    fcntl(file, F_NOCACHE, 1);

    struct stat st;
    stat("address", &st);
    length = st.st_size;

    data = malloc(length);
    memset(data,0,length);

    mmapdata = mmap(NULL, length, PROT_READ,MAP_SHARED|MAP_NOCACHE, file, 0);
    if (mmapdata == MAP_FAILED)
        fprintf(stderr, "failure");

//    read(file,data,length);
    close(file);

//    memcpy(data,mmapdata,length);
    munmap(mmapdata,length);

    free(data);

    return 0;
}