#!/usr/local/roadm/bin/perl

use strict;
use warnings;
use Net::SSH::Perl;

print "Starting main program\n";
my @childs;
my $user = "root";

my $handle;
my $host = "zeus-b001";
$handle = Net::SSH::Perl->new($host);
$handle->login($user, $user);


my $cmd = "sleep 1";
my $pid = fork();
if ($pid) {
    # parent
    push(@childs, $pid);
    print "child pid is [$pid]\n";
} elsif ($pid == 0) {
    # child
    my $ret = sub1($handle, $cmd);
    print "ret is $ret\n";
    exit 0;
} else {
    die "couldnt fork: $!\n";
}

foreach my $pid (@childs) {
    my $tmp = waitpid($pid, 0);
    print "done with pid $tmp\n";
}

# The program hangs here
my ($out,$err, $exit) = $handle->cmd("uname -a");

print "End of main program\n";

sub sub1 {
    my ($handle,$cmd) = @_;
    print "started child process\n";
    my ($out,$err,$exit) = $handle->cmd($cmd);
    print "done with child process\n";
    return 1;
}
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The program hangs in the parent process at the stmt my ($out,$err, $exit) = $handle->cmd("uname -a"); If I comment out the "my ($out,$err,$exit) = $handle->cmd($cmd);" in the subroutine sub1(), then parent process do not hang. Is there a solution to this issue or am I doing something wrong? Thanks.