On Sat, May 30, 2009 at 06:17:54PM -0500, travis+ml-twis...@subspacefield.org wrote: > The program works fine normally, and can run in the background, but if I > invoke a daemonize() routine that turns it into a network daemon, it > refuses to serve incoming TCP connections. Actually the TCP connection > is made, but the software never responds to it. > > Specifically, my twisted.internet.protocol.Factory instance is created, > but buildProtocol is never called. > > Before I dive deeply into debugging the software, I thought I'd ask if > anyone knew off the top of their head any reason why Twisted might not > act the same if it was daemonized (no controlling terminal, no > stdin/out/err, forked as a background process).
Here's some behavior I've gathered through debugging. Note that all of
the daemonization occurs before starting the reactor.
If I don't close any file descriptors during daemonization, the
program works fine.
If I close all file descriptors (3, 4, 5, 6, 7) and above, it works, but upon
disconnecting, I get the following error message:
File "/etc/keeper_screen", line 675, in <module>
reactor.run()
File "/usr/local/lib/python2.5/site-packages/twisted/internet/base.py", line
1128, in run
self.mainLoop()
--- <exception caught here> ---
File "/usr/local/lib/python2.5/site-packages/twisted/internet/base.py", line
1140, in mainLoop
self.doIteration(t)
File
"/usr/local/lib/python2.5/site-packages/twisted/internet/selectreactor.py",
line 126, in doSelect
self._preenDescriptors()
File
"/usr/local/lib/python2.5/site-packages/twisted/internet/selectreactor.py",
line 88, in _preenDescriptors
self._disconnectSelectable(selectable, e, False)
File "/usr/local/lib/python2.5/site-packages/twisted/internet/posixbase.py",
line 196, in _disconnectSelectable
selectable.connectionLost(failure.Failure(why))
File "/usr/local/lib/python2.5/site-packages/twisted/internet/posixbase.py",
line 150, in connectionLost
os.close(fd)
exceptions.OSError: [Errno 9] Bad file descriptor
If I close all file descriptors two and above, I get that error message
immediately.
If I close all file descriptors eight and above, the program works normally.
Is there some code in Twisted that expects certain file descriptors to be open?
Anyone got a clue what could be happening here?
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