graphene/LibOS/shim/test/regression/large-mmap.c

#include <stdio.h>
#include <unistd.h>
#include <sys/mman.h>
#include <sys/types.h>

#define TEST_LENGTH 0x10000f000
#define TEST_LENGTH2 0x8000f000

int main() {
    FILE*fp=fopen("testfile","a+");
    if (!fp) { perror("fopen"); return 1; }
    int rv = ftruncate(fileno(fp), TEST_LENGTH);
    if (rv) {perror ("ftruncate"); return 1;}
    else
        printf("large-mmap: ftruncate OK\n");

    void* a=mmap(NULL, TEST_LENGTH2, PROT_READ|PROT_WRITE, MAP_PRIVATE, fileno(fp), 0);
    if (a==MAP_FAILED) { perror("mmap 1"); return 1; }
    ((char*)a)[0x80000000]=0xff;
    printf("large-mmap: mmap 1 completed OK\n");

    rv = munmap(a, TEST_LENGTH2);
    if (rv) { perror("mumap"); return 1; }

    a=mmap(NULL, TEST_LENGTH, PROT_READ|PROT_WRITE, MAP_PRIVATE, fileno(fp), 0);
    if (a==MAP_FAILED) { perror("mmap 2"); return 1; }
    ((char*)a)[0x100000000]=0xff;
    printf("large-mmap: mmap 2 completed OK\n");


    return 0;
}