Restore default SIGPIPE handler after fork() #7
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The MQTT mosquitto library ignores SIGPIPE on purpose to "prevent
unnecessary client quits in threaded mode":
However, the default handler should be available to child processes
spawned by mqtt-exec. Hence, we reset it after fork(). Otherwise, this
causes issues when running test suites in Alpine.
See https://gitlab.alpinelinux.org/alpine/aports/-/issues/13573