malloc -> calloc mmap

void*

gkfs_mmap(void* addr, size_t length, int prot, int flags, int fd,

          off_t offset) {

    void* ptr = malloc(length);

    void* ptr = calloc(1, length);

    if(ptr == nullptr) {

        return MAP_FAILED;

    }

    // store info on mmap_set

    mmap_set.insert(std::make_tuple(ptr, fd, length, offset));

    gkfs::syscall::gkfs_pread(fd, ptr, length, offset);

    auto ret = gkfs::syscall::gkfs_pread(fd, ptr, length, offset);

    if(ret == -1) {

        free(ptr);

        mmap_set.erase(std::make_tuple(ptr, fd, length, offset));

        return MAP_FAILED;

    }

    return ptr;

}