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Tests for L{twisted.internet._sigchld}, an alternate, superior SIGCHLD
monitoring API.
iN(tmsg(tTestCase(tsetNonBlocking(tinstallHandlertisDefaultHandler(t_extInstallHandlert_extIsDefaultHandler(t_installHandlerUsingSetWakeupt_installHandlerUsingSignalt_isDefaultHandlertSIGCHLDTestsMixincBseZdZeedddkr-dZndZdZdZ	dZ
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    Mixin for L{TestCase} subclasses which defines several tests for
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    implementation to be tested.
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        Override in a subclass to install a SIGCHLD handler which writes a byte
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        Override in a subclass to determine if the current SIGCHLD handler is
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        Create a non-blocking pipe which will be closed after the currently
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        Save the current SIGCHLD handler as reported by L{signal.signal} and
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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,
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        L{installHandler} returns the previously registered file descriptor.
        N(RRtassertEqual(R
RRR((sF/usr/lib/python2.7/dist-packages/twisted/internet/test/test_sigchld.pyttest_returnOldFDmscCsi|j\}}|j|j|j||j|j|jd|j|jdS(sO
        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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						tDefaultSIGCHLDTestscBs&eZdZeeZeeZRS(ss
    Tests for whatever implementation is selected for the L{installHandler}
    and L{isDefaultHandler} APIs.
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    Tests for the L{twisted.internet._sigchld} implementation of the
    L{installHandler} and L{isDefaultHandler} APIs.
    iNs*twisted.internet._sigchld is not available(R1R2R3ttwisted.internet._sigchldttwistedtImportErrorR5RRRR(((sF/usr/lib/python2.7/dist-packages/twisted/internet/test/test_sigchld.pyR8s

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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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    Tests for the L{signal.signal} implementation of the L{installHandler}
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