On Sat, May 30, 2009 at 06:17:54PM -0500, travis+ml-twisted@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? -- Obama Nation | My emails do not have attachments; it's a digital signature that your mail program doesn't understand. | http://www.subspacefield.org/~travis/ If you are a spammer, please email john@subspacefield.org to get blacklisted.