> From [EMAIL PROTECTED] Fri Sep 25 05:04:02 1998
> Date: Fri, 25 Sep 1998 09:48:12 +0200
> From: Paul Brown <[EMAIL PROTECTED]>
> To: Linux C Programming <[EMAIL PROTECTED]>
> Subject: daemon query
> Sender: [EMAIL PROTECTED]
> Reply-To: Paul Brown <[EMAIL PROTECTED]>
>
> Hi all,
>
> a relatively simple question:
>
> I am just about fnished writing a daemon, and would like to know how i
> can make the program fork into
> the background automatically..
>
> ie, instead of this:
>
> #> ./daemon &
> #>
>
> i would like this:
>
> #> ./daemon
> #>
>
> Although it is written in perl i am sure the theory is the same...
>
> thanks for any help you have to offer
The princples are the same. The details have the usual perlisms. The following
is from the camel book (version 1 page 216):
FORKING A DAEMAON PROCESS
unless (fork) { # this is the child
unless (fork) { # this is the child's child
sleep 1 until getppid ==1;
LONGOPERATION;
exit 0;
}
# first child exists quickly
exit 0;
}
wait; # parent first child quickly
The minimum code to do what you want is:
fork && exit; # fork returns child pid only to parent
setpgrp(0, $$); # start a new process group if you want the daemon
# to continue exwcuting after you logoff (nohup)
There many other security and administrative issues presented from a perl
perspective in several sections in version 1. It is a useful companion to
version 2 which focus more on facilities added in perl5.
I hope this is want you wanted.
Regards,
David Ross
[EMAIL PROTECTED]
Toad Technologies
"I'll be good! I will, I will !"
