Check waitpid is not interrupted by a signal #2821
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Checks that the waitpid() call isn't interrupted by a signal when the handler for the signal is set to not interrupt the call
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Additional check for signal processing (see #2813)
Checks that the waitpid() call isn't interrupted by a signal when the handler for the signal is set to not interrupt the call.
I think this is what POSIX is saying anyway, but an explicit test doesn't hurt any.