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

module documentation
(source)

PID file.

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

nonePIDFile: `IPIDFile` = (source)

Undocumented