FAQ 8.36 How do I fork a daemon process?

Discussion in 'Perl Misc' started by PerlFAQ Server, Apr 25, 2011.

  1. 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 .

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

    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.



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

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    PerlFAQ Server, Apr 25, 2011
    #1
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