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It is very dangerous to allow a signal handler to call exit() directly,
as it can fire in the middle of other calls that shouldn't be interrupted.
This patch turns the default signal handler for SIGINT and SIGTERM
events into a tevent signal handler which can call exit() safely, rather
than a standard interrupt handler which will sometimes occur in unsafe
places (such as quitting while a lock is held that prevents tevent's
atexit functions from running)
Delivering value year after year.
Red Hat ranks #1 in value among software vendors.
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