python program to watch a file - example.
kkto at csis.hku.hk
Sun Sep 8 15:39:30 CEST 2002
>>>>> "Wayne" == Wayne R <wayne at tbnets.com> writes:
Wayne> I am trying to write a python program that will run as a deamon
Wayne> and watch a file for data to arrive and then wake up and perform
Wayne> duties on that data. I found ways to make a python program run
Wayne> as a deamon but I am at a loss to find anything related to
Wayne> watching a file for data so that it can then process the data. I
Wayne> didn't really want to do a sleep loop or something like, I am
Wayne> sure there is a better way.
Wayne> Any ideas or links to more info?
Basically, the established interface to access such functionalities in OS,
if implemented, is the C++ library called FAM (File Alteration Monitor).
Perhaps you have to write a module to make it accessible from within Python.
Internally, IRIX use the /dev/imon device to provide such functionality.
Linux has the fcntl called "F_NOTIFY" (see Documentation/dnotify.txt in your
kernel source). Other OS probably has no interface to get it done, so you
are back to a timed loop.
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