Method _write_lock_info

src/filelock/_soft.py:107–114

(fd: int)

    @staticmethod
    def _write_lock_info(fd: int) -> None:
        # No suppression: a write failure must reach the acquisition rollback so it never publishes a half-written
        # marker as held state. The optional third line is this process's start token, absent when the platform
        # exposes no proven start time, in which case a reader falls back to PID-only liveness.
        info = f"{os.getpid()}\n{host_name()}\n"
        if (token := process_start_token(os.getpid())) is not None:
            info += f"{token}\n"
        write_all(fd, info.encode())

    @property
    def pid(self) -> int | None: