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How do I fork a daemon process?

by faq_monk (Initiate)
on Oct 08, 1999 at 00:29 UTC ( #741=perlfaq nodetype: print w/ replies, xml ) Need Help??

Current Perl documentation can be found at perldoc.perl.org.

Here is our local, out-dated (pre-5.6) version:

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 the TIOCNOTTY ioctl on it. See tty(4) 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;
    

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