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[mosquitto-dev] SIGUSR1 and SIGUSR2 return errors

Hi all,

When I send a SIGUSR1 or SIGUSR2 to the mosquitto process, I see the following error message in the log:

1473261409: Error in poll: Interrupted system call.

SIGUSR2 does not seem to produce the expected behavior. SIGUSR1 produces the expected behavior -- the mosquitto.db persistence file is written to disk.

Restarting the broker did not solve the issue.

Any ideas? In particular I'd like to use SIGUSR2 to see the subscribed topics for each user, for debugging purposes.

Best,
Jacob

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