| 50 | } |
| 51 | |
| 52 | bool ZenFSBlobMMAPFile::initFileBacked(size_t size, ZenFSMMAPMode mode, const std::string& fpath, std::error_code& ec) { |
| 53 | size_ = size; |
| 54 | std::vector<char> tmp(fpath.begin(), fpath.end()); |
| 55 | tmp.push_back('\0'); |
| 56 | fd_ = ::mkstemp(tmp.data()); |
| 57 | if (fd_ < 0) { |
| 58 | ec = std::error_code(errno, std::system_category()); |
| 59 | return false; |
| 60 | } |
| 61 | ::unlink(tmp.data()); // File is deleted when fd_ is closed |
| 62 | if (::ftruncate(fd_, static_cast<off_t>(size)) != 0) { |
| 63 | ec = std::error_code(errno, std::system_category()); |
| 64 | ::close(fd_); |
| 65 | fd_ = -1; |
| 66 | return false; |
| 67 | } |
| 68 | |
| 69 | int prot = 0; |
| 70 | int flags = 0; |
| 71 | switch (mode) { |
| 72 | case ZenFSMMAPMode::kReadOnly: { |
| 73 | prot = PROT_READ; |
| 74 | flags = MAP_SHARED; |
| 75 | break; |
| 76 | } |
| 77 | case ZenFSMMAPMode::kReadWrite: { |
| 78 | prot = PROT_READ | PROT_WRITE; |
| 79 | flags = MAP_SHARED; |
| 80 | break; |
| 81 | } |
| 82 | case ZenFSMMAPMode::kCopyOnWrite: { |
| 83 | prot = PROT_READ | PROT_WRITE; |
| 84 | flags = MAP_PRIVATE; |
| 85 | break; |
| 86 | } |
| 87 | default: { |
| 88 | ec = std::make_error_code(std::errc::invalid_argument); |
| 89 | return false; |
| 90 | } |
| 91 | } |
| 92 | |
| 93 | addr_ = static_cast<uint8_t*>(::mmap(nullptr, size, prot, flags, fd_, 0)); |
| 94 | if (addr_ == MAP_FAILED) { |
| 95 | ec = std::error_code(errno, std::system_category()); |
| 96 | addr_ = nullptr; |
| 97 | cleanupPosix(); |
| 98 | return false; |
| 99 | } |
| 100 | return true; |
| 101 | } |
| 102 | |
| 103 | void ZenFSBlobMMAPFile::cleanupPosix() { |
| 104 | if (addr_) { |