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Perl Programming Language

FAQ 8.36 How do I fork a daemon process?


This is an excerpt from the latest version perlfaq8.pod, which
comes with the standard Perl distribution. These postings aim to
reduce the number of repeated questions as well as allow the community
to review and update the answers. The latest version of the complete
perlfaq is at http://faq.perl.org .

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8.36: How do I fork a daemon process?

    If by daemon process you mean one that's detached (disassociated from
    its tty), then 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 for
        details. Or better yet, you can just use the POSIX::setsid()
        function, so you don't have to worry about process groups.

    *   Change directory to /

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

    *   Background yourself like this:

                fork && exit;

    The Proc::Daemon module, available from CPAN, provides a function to
    perform these actions for you.

--------------------------------------------------------------------

The perlfaq-workers, a group of volunteers, maintain the perlfaq. They
are not necessarily experts in every domain where Perl might show up,
so please include as much information as possible and relevant in any
corrections. The perlfaq-workers also don't have access to every
operating system or platform, so please include relevant details for
corrections to examples that do not work on particular platforms.
Working code is greatly appreciated.

If you'd like to help maintain the perlfaq, see the details in
perlfaq.pod.

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