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Wraps a subprocess running ProxyCommand-driven programs.
This class implements a the socket-like interface needed by the
`.Transport` and `.Packetizer` classes. Using this class instead of a
regular socket makes it possible to talk with a Popen'd command that will
proxy traffic between the client and a server hosted in another machine.
Instances of this class may be used as context managers.
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Create a new CommandProxy instance. The instance created by this
class can be passed as an argument to the `.Transport` class.
:param str command_line:
the command that should be executed and used as the proxy.
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Write the content received from the SSH client to the standard
input of the forked command.
:param str content: string to be sent to the forked command
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Read from the standard output of the forked program.
:param int size: how many chars should be read
:return: the length of the read content, as an `int`
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