Ticket #17556: Mmap.cpp

#include <stdio.h>
#include <string.h>
#include <fcntl.h>
#include <sys/mman.h>
#include <OS.h>


int main()
{
    int fd = open("/boot/system/lib/libroot.so", O_CLOEXEC | O_RDONLY);

    uint8 *ptr1 = (uint8*)mmap(NULL, 16*B_PAGE_SIZE, PROT_READ, MAP_PRIVATE, fd, 0);
    printf("(1) %#x, %#x\n", ptr1[0], ptr1[3*B_PAGE_SIZE]);
    uint8 *ptr2 = (uint8*)mmap(&ptr1[B_PAGE_SIZE], B_PAGE_SIZE, PROT_READ | PROT_WRITE, MAP_FIXED | MAP_PRIVATE | MAP_ANON, -1, 0);
    printf("(2) %#x, %#x\n", ptr1[0], ptr1[3*B_PAGE_SIZE]); // expected to print the same as in (1)

    return 0;
}