Re^2: permission denied error when reading thru set of text files at once!!!

You can't LOCK_EX a file opened only for input, only for output.

$ perl -E'
   use Fcntl qw( LOCK_EX );
   open(my $fh, "<", ".bashrc") or die;
   flock($fh, LOCK_EX) or die;
   say "ok";
'
ok
[download]

Can't? no. But does it make sense to? Probably never.

Comment on Re^2: permission denied error when reading thru set of text files at once!!! Download Code

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Re^3: permission denied error when reading thru set of text files at once!!! (flock) by tye (Sage) on Mar 15, 2011 at 13:28 UTC
flock is implemented several different ways in different builds of Perl. Some of those ways indeed do not even allow exclusive locks against read-only file handles. - tye	[reply]