# ``twisted`.`application`.`runner`.`_pidfile``

module documentation
(source)

PID file.

Interface | `IPIDFile` | Manages a file that remembers a process ID.
Class | `AlreadyRunningError` | Process is already running.
Class | `InvalidPIDFileError` | PID file contents are invalid.
Class | `NonePIDFile` | PID file implementation that does nothing.
Class | `NoPIDFound` | No PID found in PID file.
Class | `PIDFile` | Concrete implementation of `IPIDFile`.
Class | `StalePIDFileError` | PID file contents are valid, but there is no process with the referenced PID.
Variable | `nonePIDFile` | Undocumented

nonePIDFile: `IPIDFile` = (source)

Undocumented