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Tests for L{twisted.python.sendmsg}.
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A wrapper around a FD that will remember if it has been closed or not.
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Return the fileno of this FD.
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If C{self._fd} is unclosed, raise a warning.
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Create a pipe, and return the two FDs wrapped in L{_FDHolders}.
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failure if the process produces output on standard error.
@ivar output: A C{str} used to accumulate standard output.
@ivar errors: A C{str} used to accumulate standard error.
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Tests for the Python2/3 compatible L{sendmsg} interface.
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Create a pair of UNIX sockets.
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Close the sockets opened by setUp.
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If the underlying C{sendmsg} call fails, L{send1msg} raises
L{socket.error} with its errno set to the underlying errno value.
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The behavior when the underlying C{sendmsg} call fails is the same
whether L{sendmsg} is passed ancillary data or not.
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L{recvmsg} will retrieve a message sent via L{sendmsg}.
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L{sendmsg} returns the number of bytes which it was able to send.
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L{sendmsg} treats an empty ancillary data list the same way it treats
receiving no argument for the ancillary parameter at all.
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The C{flags} argument to L{sendmsg} is passed on to the underlying
C{sendmsg} call, to affect it in whatever way is defined by those
flags.
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Calling L{sendmsg} with SOL_SOCKET, SCM_RIGHTS, and a platform-endian
packed file descriptor number should send that file descriptor to a
different process, where it can be retrieved by using L{recv1msg}.
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Tests for L{getSocketFamily}.
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Create a new socket using the given address family and return that
socket's file descriptor. The socket will automatically be closed when
the test is torn down.
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When passed the file descriptor of a socket created with the C{AF_INET}
address family, L{getSocketFamily} returns C{AF_INET}.
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When passed the file descriptor of a socket created with the
C{AF_INET6} address family, L{getSocketFamily} returns C{AF_INET6}.
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When passed the file descriptor of a socket created with the C{AF_UNIX}
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