Hi all,
I'm trying to monitor a directory "/tmp/j" with Linux::Inotify2 to be notified when a file is accessed or when a (write) file descriptor is closed. So far, I haven't been able to receive any notification events :( My guess is that I'm missing something simple.
#!/usr/bin/perl
use strict;
use warnings;
use Linux::Inotify2;
$|++;
my $inotify = new Linux::Inotify2
or die "Unable to create new inotify object: $!";
1 while $inotify->poll;
$inotify->watch("/tmp/j", IN_ACCESS | IN_CLOSE_WRITE, sub {
my $event = shift;
my $name = $event->fullname;
print "$name was accessed\n" if $event->IN_ACCESS;
print "$name is no longer mounted\n" if $event->IN_UNMOUNT;
print "$name is gone\n" if $event->IN_IGNORED;
print "$name is new\n" if $event->IN_CLOSE_WRITE;
print "events for $name have been lost\n" if $event->IN_Q_OVERFLOW;
print "jjjj\n";
$event->w->cancel;
}) or die "watch creation failed: $!";
$ dd if=/dev/zero of=/tmp/j/p bs=1M count=2
2+0 records in
2+0 records out
2097152 bytes (2.1 MB) copied, 0.101007 s, 20.8 MB/s
The script runs with no warnings.
linux kernel 2.6.24-19-generic
update:
To rule out an issue with the os, I tested with the inotifywatch of the inotify tools package. Running the dd command above several times.
$ inotifywatch -v -e access -e modify -t 20 -r /tmp/j
Establishing watches...
Setting up watch(es) on /tmp/j
OK, /tmp/j is now being watched.
Total of 1 watches.
Finished establishing watches, now collecting statistics.
Will listen for events for 20 seconds.
total modify filename
18 18 /tmp/j/
Update to the update:
Did more testing. Looks like the perldoc is wrong. The $inotify->poll needs to be called AFTER the $inotify->watch routines are set!
Thanks Animator for making me rethink how I was calling it. Working code:
#!/usr/bin/perl
use strict;
use warnings;
use Linux::Inotify2;
$|++;
my $inotify = new Linux::Inotify2
or die "Unable to create new inotify object: $!";
$inotify->watch("/tmp/j", IN_ACCESS | IN_CLOSE_WRITE, sub {
my $event = shift;
my $name = $event->fullname;
print "$name was accessed\n" if $event->IN_ACCESS;
print "$name is no longer mounted\n" if $event->IN_UNMOUNT;
print "$name is gone\n" if $event->IN_IGNORED;
print "$name is new\n" if $event->IN_CLOSE_WRITE;
print "events for $name have been lost\n" if $event->IN_Q_OVERFLOW;
print "jjjj\n";
# $event->w->cancel;
}) or die "watch creation failed: $!";
1 while $inotify->poll;