I'm surprised that that works on windows. Both select and signals are pretty unixy for the windows ports to emulate. I didn't know they could do that at all.

You're right that I omitted a way out of the while select loop. Probably last if 1 > $bytes; at the end of the loop would do it. I'll edit that into the original.

Update: Yes, concatenation in the loop would work fine, or if you wanted to get fancy I think you could say,

my $result;
while (select my $rd = $rin, undef, undef, 60) {
    my $bytes = sysread *CMD, substr($result, -1), 4096;
    last if 1 > $bytes;
}
[download]

Or else you could use the offset argument of sysread to position at the end of $result.

The 60 second timeout is new, too. Adjust to taste.

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