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SIGNALS:
Here follows a list of supported signals and their meaning; remember
that pmacct core says goodbye when its last child dies or is terminated.
pmacctd/nfacctd/sfacctd Core process:
SIGCHLD: used to handle gracefully his loved child processes;
SIGHUP: causes the reopening of connection with syslog daemon;
SIGUSR1: returns various statistics via either console or syslog; the syslog level reserved
for such purpose is the NOTICE; the facility employed is specified via the 'syslog'
configuration key instead. Actually it is ignored by nfacctd and sfacctd;
SIGUSR2: if 'refresh_maps' configuration directive is enabled it causes the Pre-Tagging map
to be reloaded;
SIGINT: ignored if the daemon is started in background; else the signal is propagated to
each running plugin (which is in turn gracefully terminated);
SIGTERM: not handled (which means it follows the default behaviour for the OS) if the daemon
is started in background; else it works like SIGINT;
SIGPIPE: ignored;
MySQL plugin process:
SIGPIPE: ignored;
SIGCHLD: ignored;
SIGHUP: inherited by Core Process;
SIGUSR1: ignored;
SIGUSR2: if 'refresh_maps' configuration directive is enabled it causes the Ports and Networks
maps to be reloaded;
SIGINT: causes the process to exit gracefully;
PGSQL plugin process:
SIGPIPE: ignored;
SIGCHLD: ignored;
SIGHUP: inherited by Core Process;
SIGUSR1: ignored;
SIGUSR2: if 'refresh_maps' configuration directive is enabled it causes the Ports and Networks
maps to be reloaded;
SIGINT: causes the process to exit gracefully;
In-memory table process:
SIGPIPE: ignored;
SIGCHLD: ignored;
SIGHUP: inherited by Core Process;
SIGUSR1: ignored;
SIGUSR2: if 'refresh_maps' configuration directive is enabled it causes the Ports and Networks
maps to be reloaded;
SIGINT: causes the process to exit gracefully;
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