#!/opt/i386-linux/perl/bin/perl -w
## Submitted by Blair Zajac <blair@orcaware.com>
## Tests blocking when piping though a &sub coprocess.
## Fixed, now in test suite.
$| = 1;
use strict;
use Carp;
use Symbol;
use IPC::Run                  0.44 qw(start);
print "My pid is $$\n";
my $out_fd = gensym;
open($out_fd, ">ZZZ.test") or
  die "$0: open: $!\n";
my $queue = '';
my @commands = ([['cat', '-'], \$queue, '|'], 
                [['cat'],  '|'], 
                [\&double, '>', $out_fd]); 
my $harness = start 'debug' => 10, map { @$_ } @commands;
$harness or
  die "$0: harness\n";
close($out_fd) or
  die "$0: cannot close: $!\n";
for (1..100) {
  $queue .= rand(100) . "\n";
  $harness->pump;
}
$harness->finish or
  die "$0: finish\n";
exit 0;
sub double {
  while (<STDIN>) {
    s/\s+$//;
    print "$_ $_\n";
  }
}