Beefy Boxes and Bandwidth Generously Provided by pair Networks
laziness, impatience, and hubris
 
PerlMonks  

comment on

( [id://3333]=superdoc: print w/replies, xml ) Need Help??
I've written a couple of daemons in Perl that I want to be controlled by the SysV init subsystem in Debian GNU/Linux (2.2.19 kernel). They provide a start-stop-daemon utility that will stop and start other programs; it knows enough to check the running process information against the PID saved in a file in /var/run.

The problem is that when I go to stop my Perl daemon, the start-stop-daemon can't find the process. It looks at the PID and determines that the name of the running process is not the same as the script name (of course, the running process is named "perl").

I've tried assigning to $0 to fake the name, but this doesn't work either (the name does not compare the same). It also seems that assigning to $0 does something funny to the apparent process name; this program:

#!/usr/bin/perl -w my $pid = fork; exit if $pid; $0 = "a"; sleep 60;

causes ps to show the name of the process as "a" followed by over 900 spaces.

I have also tried changing the --name and --exec options to start-stop-daemon to various flavors of perl, /usr/bin/perl, "/usr/bin/perl myscript.pl", all without success.

Has anyone got an idea of how to get this working? The reason I wanted to use start-stop-daemon is that it looks at the process information to determine whether the PID in the file is in fact valid.


In reply to Perl daemons and /etc/init.d scripts by bikeNomad

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



  • Are you posting in the right place? Check out Where do I post X? to know for sure.
  • Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
    <code> <a> <b> <big> <blockquote> <br /> <dd> <dl> <dt> <em> <font> <h1> <h2> <h3> <h4> <h5> <h6> <hr /> <i> <li> <nbsp> <ol> <p> <small> <strike> <strong> <sub> <sup> <table> <td> <th> <tr> <tt> <u> <ul>
  • Snippets of code should be wrapped in <code> tags not <pre> tags. In fact, <pre> tags should generally be avoided. If they must be used, extreme care should be taken to ensure that their contents do not have long lines (<70 chars), in order to prevent horizontal scrolling (and possible janitor intervention).
  • Want more info? How to link or How to display code and escape characters are good places to start.
Log In?
Username:
Password:

What's my password?
Create A New User
Domain Nodelet?
Chatterbox?
and the web crawler heard nothing...

How do I use this?Last hourOther CB clients
Other Users?
Others learning in the Monastery: (4)
As of 2024-03-29 00:23 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    No recent polls found