merlyn wrote Watching long processes through CGI, which allows you to run a process in the background and monitor the progress through a CGI script. If you "just" want to launch another script, the system function is what you want/need.

Hi,

Do it in many ways! put either of the following in your a.cgi, to invoke b.cgi

1. system("b.cgi");
2. exec("b.cgi");
3. `b.cgi`

Other options available are Threads and fork. These two are intended to have the parent monitor the child easily. Please refer to documentation for details.

Cheers !

--VC

There are three sides to any argument.....
your side, my side and the right side.

I would like to "daemonizat" the other perl script and completly dissociate it from the parent script. But save the child pid to a file. I tried the following but the system returns 0 as pid.


$pid = system("other.pl $IPaddress &");

#my $pidfile  = "/home/ember/devices/$Macaddress/$pid.pid";

#open (FILE, "> $pidfile") or die "Can't open file $pidfile\n";
#close FILE;
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You can start the script and obtain the pid using a piped open.

my $pid = open KID, "| /path/to/your/perl theScript.pl" or die ...
print KID $IPAddress;
close KID;
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I'm not sure if there are any caveats with this on your platform.

---

Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.

"Science is about questioning the status quo. Questioning authority".

In the absence of evidence, opinion is indistinguishable from prejudice.

"Too many [] have been sedated by an oppressive environment of political correctness and risk aversion."

system always returns 0 on successful launch. I recommend you do all the pid-saving in a wrapper shellscript (or Perlscript) around your child program:

#!/usr/bin/perl -w
use strict;

my $pid = $$;
my ($IPaddress) = @ARGV;

# Save our PID into the pidfile:
my $pidfile = "/home/ember/devices/$Macaddress/$pid.pid";
open (FILE, "> $pidfile") or die "Can't create file $pidfile: $!\n"; 
print FILE "$pidfile\n";
close FILE;

# and replace ourselves with the real program, which gets the same PID
+ as we had:
exec 'other.pl', $IPaddress;
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