/usr/share/doc/libipc-run-perl/examples/abuse/blocking_debug_with_sub_coprocess is in libipc-run-perl 0.92-1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 | #!/usr/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";
}
}
|