incron not seeing IN_CLOSE_WRITE?

From: Andrew Pollock <>
Date: Sat, 11 Dec 2010 08:15:58 +1000


I'm trying to use incron to invoke a program whenever some files change.

/var/log/snort/snort.last IN_CLOSE_WRITE /some/program /var/log/snort/snort.last

/var/log/snort/snort.last is created by a conventional cron job, which does
a cp of /var/log/snort/alert to /var/log/snort/snort.last on a 5 minute

This rule only seems to execute once after restarting incron, and never
again (despite the copies running every 5 minutes).

I started trying to debug what was going on, by using inotify_test from
inotify-utils-0.25. According to it, it's seeing:

MODIFY (file) 0x00000002

OPEN (file) 0x00000020

MODIFY (file) 0x00000002

CLOSE (file) 0x00000008

So basically no IN_CLOSE_WRITE, which is not what I'd expect to see for a
file copy. I even tried adding --remove-destination, but I still don't get

I tried seeing what iwatch saw, and it sees:

[10/Dec/2010 18:24:03] IN_MODIFY /var/log/snort/snort.last
[10/Dec/2010 18:24:03] IN_OPEN /var/log/snort/snort.last
[10/Dec/2010 18:24:03] IN_MODIFY /var/log/snort/snort.last
[10/Dec/2010 18:24:03] IN_CLOSE_WRITE /var/log/snort/snort.last
[10/Dec/2010 18:24:03] * /var/log/snort/snort.last is closed

which is what I was expecting to see. Why this inconsistency?

So I'm assuming that incron is seeing what inotify_test is seeing, and
iwatch is seeing what I'd expect incron to be seeing.

My understanding of IN_CLOSE is that it's like an aggregate of
IN_CLOSE_WRITE and IN_CLOSE_NOWRITE, and so I thought you'd only use this as
a mask for events you wanted to see, and it'd never be emitted itself.

What am I missing here?


Received on Tue Jun 05 2012 - 22:14:21 CEST

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