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Tests for L{twisted.internet._sigchld}, an alternate, superior SIGCHLD
monitoring API.
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Tests for the L{signal.set_wakeup_fd} implementation of the
L{installHandler} and L{isDefaultHandler} APIs.
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Create a non-blocking pipe which will be closed after the currently
running test.
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Save the current SIGCHLD handler as reported by L{signal.signal} and
the current file descriptor registered with L{installHandler}.
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Restore whatever signal handler was present when setUp ran.
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L{isDefaultHandler} returns true if the SIGCHLD handler is SIG_DFL,
false otherwise.
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L{installHandler} returns the previously registered file descriptor.
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C{installHandler(-1)} removes the SIGCHLD handler completely.
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The file descriptor passed to L{installHandler} has a byte written to
it when SIGCHLD is delivered to the process.
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