And maybe it's the problem of my scripts "external.pl" and "external2.pl" here they are: external.pl: 
#!/usr/bin/perl

my $i =0;
while($i<=1000000){
  if($i == 800){
    exit 2;    
  }
  $i++;
}

[download]
external2.pl: 
#!/usr/bin/perl

my $i =0;
while($i<=1000000){
  if($i == 900){
    exit 1;    
  }
  $i++;
}

[download]
Or I don't know what can cause these problems then...

In reply to Re^3: IPC problem by gyre007
in thread IPC problem by gyre007

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