t.i.endpoints.ProcessEndpoint doesn't work with LineReceiver because _ProcessEndpointTransport object has no attribute disconnecting

	@wallrj reported
Trac ID	trac#6606
Type	defect
Created	2013-06-30 10:48:53Z

I was trying to write an example for ProcessEndpoints:

• pingbars.py🎫5744

...but got this error from LineReceiver.

[richard@zorin udp-port-from-fd-5574-3]$ python doc/core/howto/listings/process/pingbars.py example.com                                            
Unhandled Error
Traceback (most recent call last):
  File "/home/richard/projects/Twisted/branches/udp-port-from-fd-5574-3/twisted/python/log.py", line 88, in callWithLogger
    return callWithContext({"system": lp}, func, *args, **kw)
  File "/home/richard/projects/Twisted/branches/udp-port-from-fd-5574-3/twisted/python/log.py", line 73, in callWithContext
    return context.call({ILogContext: newCtx}, func, *args, **kw)
  File "/home/richard/projects/Twisted/branches/udp-port-from-fd-5574-3/twisted/python/context.py", line 118, in callWithContext
    return self.currentContext().callWithContext(ctx, func, *args, **kw)
  File "/home/richard/projects/Twisted/branches/udp-port-from-fd-5574-3/twisted/python/context.py", line 81, in callWithContext
    return func(*args,**kw)
--- <exception caught here> ---
  File "/home/richard/projects/Twisted/branches/udp-port-from-fd-5574-3/twisted/internet/posixbase.py", line 614, in _doReadOrWrite
    why = selectable.doRead()
  File "/home/richard/projects/Twisted/branches/udp-port-from-fd-5574-3/twisted/internet/process.py", line 257, in doRead
    return fdesc.readFromFD(self.fd, self.dataReceived)
  File "/home/richard/projects/Twisted/branches/udp-port-from-fd-5574-3/twisted/internet/fdesc.py", line 94, in readFromFD
    callback(output)
  File "/home/richard/projects/Twisted/branches/udp-port-from-fd-5574-3/twisted/internet/process.py", line 260, in dataReceived
    self.proc.childDataReceived(self.name, data)
  File "/home/richard/projects/Twisted/branches/udp-port-from-fd-5574-3/twisted/internet/process.py", line 887, in childDataReceived
    self.proto.childDataReceived(name, data)
  File "/home/richard/projects/Twisted/branches/udp-port-from-fd-5574-3/twisted/internet/endpoints.py", line 336, in childDataReceived
    return self.protocol.dataReceived(data)
  File "/home/richard/projects/Twisted/branches/udp-port-from-fd-5574-3/twisted/protocols/basic.py", line 445, in dataReceived
    if self.transport.disconnecting:
exceptions.AttributeError: '_ProcessEndpointTransport' object has no attribute 'disconnecting'

trac-id__6606 6606
type__defect defect
reporter__rwall rwall
priority__normal normal
milestone__ 
branch__ 
branch_author__ 
status__new new
resolution__None None
component__core core
keywords__ 
time__1372589333000000 1372589333000000
changetime__1560836636252726 1560836636252726
version__None None
owner__None None
cc__wiml

Start with twisted/internet/endpoints.py, where _ProcessEndpointTransport handles child data, and twisted/protocols/basic.py, where LineReceiver accesses disconnecting. Reproduce the failure with doc/core/howto/listings/process/pingbars.py; done when the ProcessEndpoint example works with LineReceiver without the reported AttributeError.