Re^2: mkfifo/mknode

First thanks for your detailed reply. I used the following code but there is a problem with the flock package -

Usage: Fcntl::constant(name, arg) at Fcntl.pm line 225.
[download]

Can you please help ?

azaria

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#! /usr/local/bin/perl

chomp($hostname=`hostname`);
chomp($date = `date \'\+\%y\%m\%d\%H\%M\%S\'`);

use warnings;
use strict;
use Fcntl ':flock';
use Tie::File;


my $fifo           = "$ENV{HOME}/a_file";
my $lock           = "$fifo.lock";

tie( my @pid, 'Tie::File', $lock )->flock( LOCK_EX )
    or die "Cannot open '$lock' $!";

@pid = $$;

tie( my @lines, 'Tie::File', $fifo )->flock( LOCK_EX )
    or die "Cannot open '$fifo' $!";

( my $pop, @lines ) = sort @lines;

print "$hostname is poping $pop\n";

untie @lines;

print "PID lock file is going to be removed\n";

untie @pid;
unlink $lock or die "Cannot unlink '$lock' $!";

__END__
[download]

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Re^3: mkfifo/mknode by jwkrahn (Abbot) on Jun 15, 2006 at 01:16 UTC
I used the following code but there is a problem with the flock package - `Usage: Fcntl::constant(name, arg) at Fcntl.pm line 225.` [download] The Fcntl module that I am using does not have any "usage" messages in it however the Tie::File module does. Which version of the Tie::File module are you using? You can find out like this: `$ perl -MTie::File -le'print $Tie::File::VERSION' 0.97` [download] If the Fcntl module does not work you could go back to using: `my $LOCK_EX = 2;` [download] And change all occurances of LOCK_EX to $LOCK_EX. Also, to get the hostname you could use the Sys::Hostname module: `use Sys::Hostname; my $hostname = hostname;` [download] And to get a formatted date you could use the POSIX module: `use POSIX 'strftime'; my $date = strftime '%y%m%d%H%M%S', localtime;` [download]	[reply] [d/l] [select]

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Re^3: mkfifo/mknode
by jwkrahn (Abbot) on Jun 15, 2006 at 01:16 UTC

I used the following code but there is a problem with the flock package -
Usage: Fcntl::constant(name, arg) at Fcntl.pm line 225.
[download]

$ perl -MTie::File -le'print $Tie::File::VERSION'
0.97
[download]

my $LOCK_EX = 2;
[download]

Also, to get the hostname you could use the Sys::Hostname module:

use Sys::Hostname;

my $hostname = hostname;
[download]

use POSIX 'strftime';

my $date = strftime '%y%m%d%H%M%S', localtime;
[download]

[reply]
[d/l]
[select]