| 45 | } |
| 46 | |
| 47 | bool ddio_CreateLockFile(const std::filesystem::path& dir) { |
| 48 | std::filesystem::path lock_filename = dir / ".lock"; |
| 49 | |
| 50 | if(!std::filesystem::is_directory(lock_filename.parent_path())) { |
| 51 | return false; |
| 52 | } |
| 53 | |
| 54 | LockFileContent lock_content; |
| 55 | int32_t curr_pid = ddio_GetPID(); |
| 56 | |
| 57 | if (std::filesystem::exists(lock_filename)) { |
| 58 | try { |
| 59 | std::ifstream lockfile(lock_filename, std::ios::binary); |
| 60 | lockfile >> lock_content; |
| 61 | lockfile.close(); |
| 62 | } catch (std::exception &e) { |
| 63 | return false; |
| 64 | } |
| 65 | |
| 66 | if (lock_content.tag != LOCK_TAG) { |
| 67 | return false; |
| 68 | } |
| 69 | |
| 70 | // it appears to be a lock file, check the pid |
| 71 | ASSERT(lock_content.pid != -1); |
| 72 | |
| 73 | // check the file id in the file, compared to our pid |
| 74 | if (lock_content.pid == curr_pid) { |
| 75 | // lock file already exists for the current process |
| 76 | return true; |
| 77 | } |
| 78 | |
| 79 | if (ddio_CheckProcess(lock_content.pid)) { |
| 80 | // Process exists, lock still valid |
| 81 | return false; |
| 82 | } |
| 83 | |
| 84 | // the process no longer exists, we can create a lock file if needed |
| 85 | // we'll delete the useless one now |
| 86 | // the lock file in the directory belongs to us! |
| 87 | std::filesystem::remove(lock_filename); |
| 88 | } |
| 89 | |
| 90 | lock_content.pid = curr_pid; |
| 91 | |
| 92 | try { |
| 93 | std::ofstream lockfile(lock_filename, std::ios::binary); |
| 94 | lockfile << lock_content; |
| 95 | lockfile.close(); |
| 96 | } catch (std::exception &e) { |
| 97 | return false; |
| 98 | } |
| 99 | |
| 100 | // at this point result will either be 1 or 2 from checking the lock file |
| 101 | // either way, a lock file has been created |
| 102 | return true; |
| 103 | } |
| 104 |
no test coverage detected