Thank you so much for your assistance! The subprocess that starts the ssh connection set the $ENV{"PATH"} = "/usr/bin"; (required by expect because of possible tainted return) The $exp->error() returns -1 after each interaction. Unfortuantly i'm very limited on the system i use, and i do not have access to Net::SSH::Any or IPC. 
# assigns a job to a worker process.
# :param 0:     job.
# :return:
sub assign_job {
    my ($job) = @_;
    my $pid = open my $pipe => "-|";                    # create worke
+r process and connect it using a pipe.
    Debug::dlog("spawned process : $pid");
    die "Failed to fork: $!" unless defined $pid;       # check that c
+reation was successfull.
    my $routine = $job->get_routine();                  # get routine 
+to execute.
    my $params = $job->get_params();                    # get paramete
+rs to pass.
    unless ($pid) {                                     # the followin
+g code is only executed in the worker process:
        $ENV{"PATH"} = "/usr/bin";                      # delete conte
+xt.
        my $return = $routine->(@$params);              # execute rout
+ine.
        my $dump = Dumper($return);                     # serialize th
+e returned object.
        print($dump);                                   # print data s
+tring to pipe.
        Debug::dlog("process ".$$." dumped ".length($dump)." chars");
        exit;                                           # terminate pr
+ocess.
    } else {                                            # only in pare
+nt process:
        my $worker = new Worker($pipe, $pid);           # construct ne
+w worker object.
        push(@Dispatcher::workers, $worker);            # save worker 
+object.
    }
}

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In reply to Re^4: Expect receives no output, when requested via HTML by Clive89
in thread Expect receives no output, when requested via HTML by Clive89

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