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Whitebox tests for TCP APIs.
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Test assumptions about platform behaviors.
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Create and return a new socket object, also tracking it so it can be
closed in the test tear down.
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Tests for select-specific failure conditions.
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Create, start, and return a new L{Port}, also tracking it so it can
be stopped in the test tear down.
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Test behavior in the face of an exception from C{accept(2)}.
On any exception which indicates the platform is unable or unwilling
to allocate further resources to us, the existing port should remain
listening, a message should be logged, and the exception should not
propagate outward from doRead.
@param socketErrorNumber: The errno to simulate from accept.
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Pretend to be a socket in an overloaded system.
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C{accept(2)} can fail with C{EMFILE} when there are too many open file
descriptors in the process. Test that this doesn't negatively impact
any other existing connections.
C{EMFILE} mainly occurs on Linux when the open file rlimit is
encountered.
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Similar to L{test_tooManyFilesFromAccept}, but test the case where
C{accept(2)} fails with C{ENOBUFS}.
This mainly occurs on Windows and FreeBSD, but may be possible on
Linux and other platforms as well.
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Similar to L{test_tooManyFilesFromAccept}, but test the case where
C{accept(2)} fails with C{ECONNABORTED}.
It is not clear whether this is actually possible for TCP
connections on modern versions of Linux.
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Similar to L{test_tooManyFilesFromAccept}, but test the case where
C{accept(2)} fails with C{ENFILE}.
This can occur on Linux when the system has exhausted (!) its supply
of inodes.
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Similar to L{test_tooManyFilesFromAccept}, but test the case where
C{accept(2)} fails with C{ENOMEM}.
On Linux at least, this can sensibly occur, even in a Python program
(which eats memory like no ones business), when memory has become
fragmented or low memory has been filled (d_alloc calls
kmem_cache_alloc calls kmalloc - kmalloc only allocates out of low
memory).
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L{tcp.Port.doRead} increases the number of consecutive
C{accept} calls it performs if all of the previous C{accept}
calls succeed; otherwise, it reduces the number to the amount
of successful calls.
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C{accept(2)} returning C{EPERM} is treated as a transient
failure and the call retried no more than the maximum number
of consecutive C{accept(2)} calls.
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Pretend to be a socket in an overloaded system whose
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C{maximumNumberOfAccepts} times.
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A C{socket.error} raised by C{accept(2)} whose C{errno} is
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