twisted.application.runner._pidfile.NonePIDFile(object)
class documentationtwisted.application.runner._pidfile
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Implements interfaces: twisted.application.runner._pidfile.IPIDFile
PID file implementation that does nothing.
This is meant to be used as a "active None" object in place of a PID file when no PID file is desired.
Method | __init__ | Undocumented |
Method | read | Read the process ID stored in this PID file. |
Method | writeRunningPID | Store the PID of the current process in this PID file. |
Method | remove | Remove this PID file. |
Method | isRunning | Determine whether there is a running process corresponding to the PID in this PID file. |
Method | __enter__ | Enter a context using this PIDFile. |
Method | __exit__ | Exit a context using this PIDFile. |
Method | _write | Store a PID in this PID file. |
Read the process ID stored in this PID file.
Returns | The contained process ID. (type: int ) | |
Raises | NoPIDFound | If this PID file does not exist. |
EnvironmentError | If this PID file cannot be read. | |
ValueError | If this PID file's content is invalid. |
Store a PID in this PID file.
Parameters | pid | A PID to store. (type: int ) |
Raises | EnvironmentError | If this PID file cannot be written. |
Note | This implementation always raises an EnvironmentError . |
Store the PID of the current process in this PID file.
Raises | EnvironmentError | If this PID file cannot be written. |
Remove this PID file.
Raises | EnvironmentError | If this PID file cannot be removed. |
Determine whether there is a running process corresponding to the PID in this PID file.
Returns | True if this PID file contains a PID and a process with that PID is
currently running; false otherwise. (type: bool ) | |
Raises | EnvironmentError | If this PID file cannot be read. |
InvalidPIDFileError | If this PID file's content is invalid. | |
StalePIDFileError | If this PID file's content refers to a PID for which there is no corresponding running process. |
Enter a context using this PIDFile.
Writes the PID file with the PID of the running process.
Raises | AlreadyRunningError | A process corresponding to the PID in this PID file is already running. |
Exit a context using this PIDFile.
Removes the PID file.