Spawn Expect Object in the background doesn't work

set_uk has asked for the wisdom of the Perl Monks concerning the following question:

I have a script which successfully uses Expect.pm to spawn telnet sessions. This works great when run in the foreground - but when in the background the script just dies. In the following snippet the code always stops just after "AHEAD OF SPAWN". I guess this is down to IO::TTy and IO::Pty needing a terminal? Can anyone shed any light on this as I dont understand to be even dangerous on this one. Thanks Simon

 $self->{_logger}->debug("AHEAD OF SPAWN");
      eval {    
        $Spawned = Expect->spawn("$args[0] $args[1]");
        $msg = "Spawning to $args[0] $args[1]\n";
        $self->{_logger}->info($msg);
      };
      $self->{_logger}->debug("AFTER OF SPAWN");
[download]

Found out that the script doesn't die - it just stops and sits there waiting to be brought into the foreground. When it is - it starts again and picks up normal processing

Comment on Spawn Expect Object in the background doesn't work Download Code

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Re: Spawn Expect Object in the background doesn't work by Fletch (Bishop) on Apr 01, 2004 at 14:43 UTC
You might get more enlightenment if you check if the spawn call is returning an error or not, printing out `$!` if it's not.	[reply] [d/l]
Re: Re: Spawn Expect Object in the background doesn't work by set_uk (Pilgrim) on Apr 01, 2004 at 18:47 UTC
Found out that the script doesn't die it just stops processing until it is back in the foreground	[reply]
Re: Spawn Expect Object in the background doesn't work by TilRMan (Friar) on Apr 02, 2004 at 12:37 UTC
It might be the way your shell handles background jobs. Try running the script under nohup(1).	[reply]