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eliciting an unused ephemeral port from the OS. The temporary socket is
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server socket needs to be bound to a particular port for the duration of
the test. Which one to use depends on whether the calling code is creating
a python socket, or if an unused port needs to be provided in a constructor
or passed to an external program (i.e. the -accept argument to openssl's
s_server mode). Always prefer bind_port() over find_unused_port() where
possible. Hard coded ports should *NEVER* be used. As soon as a server
socket is bound to a hard coded port, the ability to run multiple instances
of the test simultaneously on the same host is compromised, which makes the
test a ticking time bomb in a buildbot environment. On Unix buildbots, this
may simply manifest as a failed test, which can be recovered from without
intervention in most cases, but on Windows, the entire python process can
completely and utterly wedge, requiring someone to log in to the buildbot
and manually kill the affected process.
(This is easy to reproduce on Windows, unfortunately, and can be traced to
the SO_REUSEADDR socket option having different semantics on Windows versus
Unix/Linux. On Unix, you can't have two AF_INET SOCK_STREAM sockets bind,
listen and then accept connections on identical host/ports. An EADDRINUSE
OSError will be raised at some point (depending on the platform and
the order bind and listen were called on each socket).
However, on Windows, if SO_REUSEADDR is set on the sockets, no EADDRINUSE
will ever be raised when attempting to bind two identical host/ports. When
accept() is called on each socket, the second caller's process will steal
the port from the first caller, leaving them both in an awkwardly wedged
state where they'll no longer respond to any signals or graceful kills, and
must be forcibly killed via OpenProcess()/TerminateProcess().
The solution on Windows is to use the SO_EXCLUSIVEADDRUSE socket option
instead of SO_REUSEADDR, which effectively affords the same semantics as
SO_REUSEADDR on Unix. Given the propensity of Unix developers in the Open
Source world compared to Windows ones, this is a common mistake. A quick
look over OpenSSL's 0.9.8g source shows that they use SO_REUSEADDR when
openssl.exe is called with the 's_server' option, for example. See
http://bugs.python.org/issue2550 for more info. The following site also
has a very thorough description about the implications of both REUSEADDR
and EXCLUSIVEADDRUSE on Windows:
http://msdn2.microsoft.com/en-us/library/ms740621(VS.85).aspx)
XXX: although this approach is a vast improvement on previous attempts to
elicit unused ports, it rests heavily on the assumption that the ephemeral
port returned to us by the OS won't immediately be dished back out to some
other process when we close and delete our temporary socket but before our
calling code has a chance to bind the returned port. We can deal with this
issue if/when we come across it.
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If *quiet* is False (default) and it is not possible to
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r r NT)rD Warningrh )rb r r rW rW rX rH s c c sO t j d d & } t j d d t d Vt Wd QRX| j | g d S)a" Context manager to check that no ResourceWarning is emitted.
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c s[ d d l } t t | } t t | | j z t t | VWd t t | | Xd S)zReturn a context manager used by captured_stdout/stdin/stderr
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In non-CPython implementations of Python, this is needed because timely
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| f | a d S) Nr i mgtz(\d+(\.\d+)?) (K|M|G|T)b?$zInvalid memory limit %rr r z$Memory limit %r too low to be useful)_1M_1Gr\ r]
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z_MemoryWatchdog.stopN)rS rT rU rV rN r r rW rW rW rX r j s r c s f d d } | S)at Decorator for bigmem tests.
'size' is a requested size for the test (in arbitrary, test-interpreted
units.) 'memuse' is the number of bytes per unit for the test, or a good
estimate of it. For example, a test that needs two byte buffers, of 4 GiB
each, could be decorated with @bigmemtest(size=_4G, memuse=2).
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extra argument. If 'dry_run' is true, the value passed to the test method
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test doesn't support dummy runs when -M is not specified.
c s. f d d _ _ S)Nc
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Examples:
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c C s d S)z,Just used to check if docstrings are enabledNrW rW rW rW rX _check_docstringsv s r win32WITH_DOC_STRINGSztest requires docstringsc C s d d l } | d k r! t } n d } | j | d | d | \ } } | rd t d | | f t r t d | j | f | | f S)a Run doctest on the given module. Return (#failures, #tests).
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c s/ t s
St j f d d } | S)zUse this function when threads are being used. This will
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c s) t } z | SWd t | Xd S)N)rD rE )r key)r rW rX r s z reap_threads.<locals>.decorator)r! r r )r r rW )r rX rF s !c C sX t t d rT d } x< y, t j | t j \ } } | d k rC PWq PYq Xq Wd S)zUse this function at the end of test_main() whenever sub-processes
are started. This will help ensure that no extra children (zombies)
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c s t | | rN t | | } t | | | z | VWd t | | | Xn9 t | | | z d VWd t | | r t | | Xd S)a Temporary swap out an attribute with a new object.
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rO c C s, t } d } | r | St j | | S)zDSkip decorator for tests that require functional extended attributesz(no non-broken extended attribute support)rO rf r )r rJ rk rW rW rX r4 s c C s} t j d | d } | j } | j } | | k rB | j } y t j j | | SWn t k
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rY c C sU t t | t t | } | r8 | t | 8} t d d | D } | S)a Returns the set of items in ref_api not in other_api, except for a
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"c @ s: e Z d Z d Z d Z d Z d d Z d d Z d S)rP zTry to prevent a crash report from popping up.
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rP t d Yn Xd f d d } | j | t | d S)zOverride 'object_to_patch'.'attr_name' with 'new_value'.
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