Why yes, you're right, but our friend, the late W. Richard Stevens goes farther and explains that the best method is as following: 
#untested code conversion from C sources
exit if fork()!=0;
setsid();
$SIG{'HUP'}='IGNORE';
exit if fork()!=0;
chdir('/'); #prevents path-specific hax
umask(0); #clear file mode creation mask
openlog(...); #standard syslog call

[download]
With the second call to fork, we are guaranteed that the child is not a session leader and therefore cannot acquire a controlling terminal. We ignore SIGHUP since the session leader is soon to be terminated. Just an expansion on what you said. I certainly admire and trust the late Mr. Stevens very much!
AgentM Systems nor Nasca Enterprises nor Bone::Easy nor Macperl is responsible for the comments made by AgentM. Remember, you can build any logical system with NOR.

In reply to Re: Re: Answer: How do I run a script in the background? How should I run a script as daemon? by AgentM
in thread How do I run a script in the background? How should I run a script as daemon? by jeroenes

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.