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Avoid to catch the SIGCHLD signal triggered every five minutes
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Description

Every five minutes, a SIGCHLD is sent to the Wearg process.

We should use a table of signals to capture ignoring SIGCHLD in RabbitMQ or we should avoid to call broker::get_messages where the seconds is 0 and the minute is a multiple of five.

00:00:00 <wearg> [DEBUG] Ignoring SIGCHLD
00:00:16 <wearg> [00:00:16] --- Sat Dec 19 2015
01:00:00 <wearg> [DEBUG] Ignoring SIGCHLD
01:30:00 <wearg> [DEBUG] Ignoring SIGCHLD
05:55:00 <wearg> [DEBUG] Ignoring SIGCHLD
06:55:00 <wearg> [DEBUG] Ignoring SIGCHLD