Re: [mosquitto-dev] SIGUSR1 and SIGUSR2 return errors

[Roger Light <roger@xxxxxxxxxx>]

Hi Jacob,

The "error" isnt anything to worry about, it's just because the call
to poll() isn't protected against being interrupted by those signals.
I agree with the implication that it's a bit annoying though.

SIGUSR2 causes the subscription tree to be printed to stdout. If your
broker was started as a service or is daemonised then you won't see
that text at all.

Cheers,

Roger


On Wed, Sep 7, 2016 at 4:21 PM, Jacob Lynn <abeboparebop@xxxxxxxxx> wrote:
> 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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