Polipo will shut down cleanly if it receives
SIGINT signals; this will normally happen
when a Polipo in the foreground receives a
^C key press, when
your system shuts down, or when you use the
kill command with
no flags. Polipo will then write-out all its in-memory data to disk
If Polipo receives the
SIGUSR1 signal, it will write out all
the in-memory data to disk (but won’t discard them), reopen the log
file, and then reload the forbidden URLs file (see Forbidden).
Finally, if Polipo receives the
SIGUSR2 signal, it will write
out all the in-memory data to disk and discard as much of the memory
cache as possible. It will then reopen the log file and reload the
forbidden URLs file.