Method NewAppendableFile

src/leveldb/util/env_posix.cc:571–582

  }

  Status NewAppendableFile(const std::string& filename,
                           WritableFile** result) override {
    int fd = ::open(filename.c_str(),
                    O_APPEND | O_WRONLY | O_CREAT | kOpenBaseFlags, 0644);
    if (fd < 0) {
      *result = nullptr;
      return PosixError(filename, errno);
    }

    *result = new PosixWritableFile(filename, fd);
    return Status::OK();
  }

  bool FileExists(const std::string& filename) override {
    return ::access(filename.c_str(), F_OK) == 0;