Re: Lightweight Solution To "Only 1 Process Running" On AIX

[hossman]

in reply to Lightweight Solution To "Only 1 Process Running" On AIX

It's been 11 years since I've used an AIX machine, but if i remember correctly binding a socket to a specific port works on AIX (and every other OS i've ever tried)...

#!/usr/bin/perl -l

use warnings;
use strict;
use Socket;

my $sock_fh;

BEGIN {
    my $port = 987654; # any constant specific to this app
    socket($sock_fh, PF_INET, SOCK_STREAM, getprotobyname('tcp'))
    or die "socket: $!";
    bind($sock_fh, sockaddr_in($port, INADDR_LOOPBACK))
    or (warn "another process is already running ($!)\n"
        and exit(1));
}

# BEGIN: where you do your work
print "send interupt to kill process";
while (<>) {
    sleep 1; 
}
# END: where you do your work

END {
    $sock_fh->close() if defined $sock_fh;
}