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Re^3: Fork exec and not wait?

by eyepopslikeamosquito (Chancellor)
on Jan 24, 2013 at 20:09 UTC ( #1015227=note: print w/replies, xml ) Need Help??

in reply to Re^2: Fork exec and not wait?
in thread Fork exec and not wait?

If you want something comparable to "&" in Unix, I recommend fork and exec, not threads. If you want sound advice from us, rather than random guessing, you will need to provide more background and context of your application and what you are trying to achieve. And you will need to post some code.

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Re^4: Fork exec and not wait?
by packetstormer (Monk) on Jan 24, 2013 at 20:32 UTC

    OK, thanks for the replies. I hope my tone wasn't dismissive of anyone's suggestions, I certainly didn't mean to be and I am grateful for anyone taking the time to respond!

    Here is some code. I pass a string from a webpage and I then need to bring up an ssh tunnel in the background (I know I could do this using some existing modules instead of the system call but I stumbled across this issues and I'd like to figure it out this way!

    #!/usr/bin/perl use strict; use CGI; use Frontier::Client; use Template; my $catch = $cgi->param("catch"); my $exec = 'ssh -T -N -i /home/user/.ssh/keys +/login.key -p 2022 -L 1111:'; my $pid; defined($pid = fork()) or die "We've go some forking trouble - $!\n"; if ($pid == 0) { exec($exec); die "No exec here and here's why: $!\n"; exit(); } my $server = Frontier::Client->new(url => $catch, ); my $name = $cgi->param("title"); my $cat = $cgi->param("category"); my $priority = "1"; my $Top = $server->boolean("0"); my $method = "appenurl"; my $u = $cgi->param("u"); my $i = $cgi->param("i"); my $r = $cgi->param("r"); my $url = "$u&$i&$r"; my $result = $server->call("appendurl",($name,$cat,$priority,$Top,$url +) );
    So, if I pass the CGI param via the command line I get the tunnel up and sits at the remote login prompt (after a sucessful login) it doesn't continue on to the XMLRPC part. In a browser, the headers (which I am calling from a templat e not included in this code) don't get printed, the script just hangs.

    I am starting to think I am doing something really trivially, stupid at this stage?

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[Discipulus]: to crash is not the default behaviour of IE? ;=)
[Discipulus]: so every library (js) to sdelect and modify the id parameters can be good.
[Discipulus]: I never understood something: I can on the fly modify the XML structure of the SVG using for example XML::Twig ?
[Corion]: Discipulus: If you want to rewrite the SVG, then yes, something like XML::Twig should be enough. I would try to not modify the SVG but only modify the display, but so far I haven't convinced IE to change the style...
Corion gives up

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