gnupg: Dirmngr Signals
3.4 Use of signals
==================
A running 'dirmngr' may be controlled by signals, i.e. using the 'kill'
command to send a signal to the process.
Here is a list of supported signals:
'SIGHUP'
This signal flushes all internally cached CRLs as well as any
cached certificates. Then the certificate cache is reinitialized
as on startup. Options are re-read from the configuration file.
Instead of sending this signal it is better to use
gpgconf --reload dirmngr
'SIGTERM'
Shuts down the process but waits until all current requests are
fulfilled. If the process has received 3 of these signals and
requests are still pending, a shutdown is forced. You may also use
gpgconf --kill dirmngr
instead of this signal
'SIGINT'
Shuts down the process immediately.
'SIGUSR1'
This prints some caching statistics to the log file.