# Path: paramiko/ssh_exception.py
# class ProxyCommandFailure(SSHException):
#     """
#     The "ProxyCommand" found in the .ssh/config file returned an error.
# 
#     :param str command: The command line that is generating this exception.
#     :param str error: The error captured from the proxy command output.
#     """
# 
#     def __init__(self, command, error):
#         SSHException.__init__(self, command, error)
#         self.command = command
#         self.error = error
# 
#     def __str__(self):
#         return 'ProxyCommand("{}") returned nonzero exit status: {}'.format(
#             self.command, self.error
#         )
# 
# Path: paramiko/util.py
# class ClosingContextManager(object):
#     def __enter__(self):
#         return self
# 
#     def __exit__(self, type, value, traceback):
#         self.close()


import os
import shlex
import signal
import socket
import time
    import subprocess
from select import select
from paramiko.ssh_exception import ProxyCommandFailure
from paramiko.util import ClosingContextManager
        """
        Read from the standard output of the forked program.

        :param int size: how many chars should be read

        :return: the string of bytes read, which may be shorter than requested
        """
        try:
            buffer = b""
            start = time.time()
            while len(buffer) < size:
                select_timeout = None
                if self.timeout is not None:
                    elapsed = time.time() - start
                    if elapsed >= self.timeout:
                        raise socket.timeout()
                    select_timeout = self.timeout - elapsed

                r, w, x = select([self.process.stdout], [], [], select_timeout)
                if r and r[0] == self.process.stdout:
                    buffer += os.read(
                        self.process.stdout.fileno(), size - len(buffer)
                    )
            return buffer
        except socket.timeout:
            if buffer:
                # Don't raise socket.timeout, return partial result instead
                return buffer
            raise  # socket.timeout is a subclass of IOError
        except IOError as e:

# Path: paramiko/ssh_exception.py
# class ProxyCommandFailure(SSHException):
#     """
#     The "ProxyCommand" found in the .ssh/config file returned an error.
# 
#     :param str command: The command line that is generating this exception.
#     :param str error: The error captured from the proxy command output.
#     """
# 
#     def __init__(self, command, error):
#         SSHException.__init__(self, command, error)
#         self.command = command
#         self.error = error
# 
#     def __str__(self):
#         return 'ProxyCommand("{}") returned nonzero exit status: {}'.format(
#             self.command, self.error
#         )
# 
# Path: paramiko/util.py
# class ClosingContextManager(object):
#     def __enter__(self):
#         return self
# 
#     def __exit__(self, type, value, traceback):
#         self.close()


# Path: paramiko/proxy.py
import os
import shlex
import signal
import socket
import time
    import subprocess
from select import select
from paramiko.ssh_exception import ProxyCommandFailure
from paramiko.util import ClosingContextManager

        """
        Read from the standard output of the forked program.

        :param int size: how many chars should be read

        :return: the string of bytes read, which may be shorter than requested
        """
        try:
            buffer = b""
            start = time.time()
            while len(buffer) < size:
                select_timeout = None
                if self.timeout is not None:
                    elapsed = time.time() - start
                    if elapsed >= self.timeout:
                        raise socket.timeout()
                    select_timeout = self.timeout - elapsed

                r, w, x = select([self.process.stdout], [], [], select_timeout)
                if r and r[0] == self.process.stdout:
                    buffer += os.read(
                        self.process.stdout.fileno(), size - len(buffer)
                    )
            return buffer
        except socket.timeout:
            if buffer:
                # Don't raise socket.timeout, return partial result instead
                return buffer
            raise  # socket.timeout is a subclass of IOError
        except IOError as e:

            raise ProxyCommandFailure(" ".join(self.cmd), e.strerror)