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Utility methods.
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Standard error data was received where it was not expected. This is a
subclass of L{IOError} to preserve backward compatibility with the previous
error behavior of L{getProcessOutput}.
@ivar processEnded: A L{Deferred} which will fire when the process which
produced the data on stderr has ended (exited and all file descriptors
closed).
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Trivial protocol for communicating with a process and turning its output
into the result of a L{Deferred}.
@ivar deferred: A L{Deferred} which will be called back with all of stdout
and, if C{errortoo} is true, all of stderr as well (mixed together in
one string). If C{errortoo} is false and any bytes are received over
stderr, this will fire with an L{_UnexpectedErrorOutput} instance and
the attribute will be set to C{None}.
@ivar onProcessEnded: If C{errortoo} is false and bytes are received over
stderr, this attribute will refer to a L{Deferred} which will be called
back when the process ends. This C{Deferred} is also associated with
the L{_UnexpectedErrorOutput} which C{deferred} fires with earlier in
this case so that users can determine when the process has actually
ended, in addition to knowing when bytes have been received via stderr.
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Spawn a process and return its output as a deferred returning a string.
@param executable: The file name to run and get the output of - the
full path should be used.
@param args: the command line arguments to pass to the process; a
sequence of strings. The first string should *NOT* be the
executable's name.
@param env: the environment variables to pass to the processs; a
dictionary of strings.
@param path: the path to run the subprocess in - defaults to the
current directory.
@param reactor: the reactor to use - defaults to the default reactor
@param errortoo: If true, include stderr in the result. If false, if
stderr is received the returned L{Deferred} will errback with an
L{IOError} instance with a C{processEnded} attribute. The
C{processEnded} attribute refers to a L{Deferred} which fires when the
executed process ends.
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c C su | j j } | j j } | j } | j } | j rX | j j | | | j f n | j j | | | f d S( N( R4 R+ R5 R0 R1 t signalR R# R* ( R R, t outR' t et code( ( s: /usr/lib/python2.7/dist-packages/twisted/internet/utils.pyR s ( R R R R ( ( ( s: /usr/lib/python2.7/dist-packages/twisted/internet/utils.pyR3 s c C s t t | | | | | S( s. Spawn a process and returns a Deferred that will be called back with
its output (from stdout and stderr) and it's exit code as (out, err, code)
If a signal is raised, the Deferred will errback with the stdout and
stderr up to that point, along with the signal, as (out, err, signalNum)
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t d | | Sd S( s% Run the function C{f}, but with some warnings suppressed.
@param suppressedWarnings: A list of arguments to pass to filterwarnings.
Must be a sequence of 2-tuples (args, kwargs).
@param f: A callable, followed by its arguments and keyword arguments
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Wrap C{f} in a callable which suppresses the indicated warnings before
invoking C{f} and unsuppresses them afterwards. If f returns a Deferred,
warnings will remain suppressed until the Deferred fires.
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