PidFile class featuring:
stale detection
pidfile locking (fcntl)
chmod (default is 0o644)
chown
custom exceptions
Context Manager
PidFile can be used as a context manager:
with PidFile(): do_something()
Exception Order
In default mode PidFile will try to acquire a file lock before anything else. This means that normally you get a PidFileAlreadyLockedError instead of the PidFileAlreadyRunningError when running a program twice.
If you just want to know if a program is already running its easiest to use just PidFileError since it will capture all possible PidFile exceptions.
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