void copy(const char *src, const char *dst) {
std::cout << "copying " << src << " to " << dst << std::endl;
Mmap<char> mmap;
CHECK_DIE(mmap.open(src)) << mmap.what();
std::ofstream ofs(dst, std::ios::binary|std::ios::out);
CHECK_DIE(ofs) << "permission denied: " << dst;
ofs.write(reinterpret_cast<char*>(mmap.begin()), mmap.size());
ofs.close();
}
int open(char const *name, int flags)
{
++open_;
return mm_->open(name, flags);
}