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Like sgifford, I believe the problem lies in writedata or release_lock (or in some other code you've not shown us).

I also believe your code should be cleaned up a bit, such as:

#!/usr/bin/perl use warnings; use strict; use Fcntl qw':flock :seek'; our $COUNT_FILE = 'mycounter'; my $cfh; -e $COUNT_FILE ? open $cfh, "+< $COUNT_FILE" : open $cfh, "+> $COUNT_FILE" # not needed if file always exists or die "Can't open $COUNT_FILE: $!\n"; flock($cfh, LOCK_EX) or die "Can't lock: $!\n"; chomp(my $count = <$cfh> || ''); seek($cfh, 0, SEEK_SET); print $cfh ++$count, "\n"; print "Run #$count\n"; # truncate not needed as $count is always increasing close($cfh); # automagically releases the lock

Black flowers blossom
Fearless on my breath

In reply to Re: Mysterious Disapperance of file contents by bbfu
in thread Mysterious Disapperance of file contents by Gorby

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