/ 
File-Pid-1.01
River stage one • 4 direct dependents • 8 total dependents
/ File::Pid

NAME

File::Pid - Pid File Manipulation

SYNOPSIS

use File::Pid;

my $pidfile = File::Pid->new({
  file => '/some/file.pid',
});

$pidfile->write;

if ( my $num = $pidfile->running ) {
    die "Already running: $num\n";
}

$pidfile->remove;

DESCRIPTION

This software manages a pid file for you. It will create a pid file, query the process within to discover if it's still running, and remove the pid file.

new

my $pidfile = File::Pid->new;

my $thisfile = File::Pid->new({
  file => '/var/run/daemon.pid',
});

my $thisfileandpid = File::Pid->new({
  file => '/var/run/daemon.pid',
  pid  => '145',
});

This constructor takes two optional paramters.

file - The name of the pid file to work on. If not specified, a pid file located in File::Spec->tmpdir() will be created that matches (File::Basename::basename($0))[0] . '.pid'. So, for example, if $0 is ~/bin/sig.pl, the pid file will be /tmp/sig.pl.pid.

pid - The pid to write to a new pidfile. If not specified, $$ is used when the pid file doesn't exist. When the pid file does exist, the pid inside it is used.

file

my $pidfile = $pidfile->file;

Accessor/mutator for the filename used as the pid file.

pid

my $pid = $pidfile->pid;

Accessor/mutator for the pid being saved to the pid file.

write

my $pid = $pidfile->write;

Writes the pid file to disk, inserting the pid inside the file. On success, the pid written is returned. On failure, undef is returned.

running

my $pid = $pidfile->running;
die "Service already running: $pid\n" if $pid;

Checks to see if the pricess identified in the pid file is still running. If the process is still running, the pid is returned. Otherwise undef is returned.

remove

$pidfile->remove or warn "Couldn't unlink pid file\n";

Removes the pid file from disk. Returns true on success, false on failure.

program_name

This is a utility method that allows you to determine what File::Pid thinks the program name is. Internally this is used when no pid file is specified.

SEE ALSO

perl.

AUTHOR

Casey West, <casey@geeknest.com>.

COPYRIGHT

Copyright (c) 2005 Casey West.  All rights reserved.
This module is free software; you can redistribute it and/or modify it
under the same terms as Perl itself.