Complete Dissociation of Child from Parent

In some cases (starting server processes, for instance) you'll want to complete dissociate the child process from the parent. The easiest way is to use:

use POSIX qw(setsid);
    setsid()            or die "Can't start a new session: $!";

However, you may not be on POSIX. The following process is reported to work on most Unixish systems. Non-Unix users should check their Your_OS::Process module for other solutions.

    * Open /dev/tty and use the TIOCNOTTY ioctl on it. See tty(4) for details.

    * Change directory to /

    * Reopen STDIN, STDOUT, and STDERR so they're not connected to the old tty.

    * Background yourself like this:

fork && exit;

    * Ignore hangup signals in case you're running on a shell that doesn't automatically no-hup you:

$SIG{HUP} = 'IGNORE';       # or whatever you'd like