#!/usr/bin/perl
# cmd3sel - control all three of kids in, out, and error.
use IPC::Open3;
use IO::Select;

$cmd = "grep vt33 /none/such - /etc/termcap";
$pid = open3(*CMD_IN, *CMD_OUT, *CMD_ERR, $cmd);

$SIG{CHLD} = sub {
    print "REAPER: status $? on $pid\n" if waitpid($pid, 0) > 0
};

print CMD_IN "This line has a vt33 lurking in it\n";
close(CMD_IN);

$selector = IO::Select->new();
$selector->add(*CMD_ERR, *CMD_OUT);

while (@ready = $selector->can_read) {
    foreach $fh (@ready) {
        if (fileno($fh) == fileno(CMD_ERR)) {print "STDERR: ", scalar <CMD_ERR>}
        else                                {print "STDOUT: ", scalar <CMD_OUT>}
        $selector->remove($fh) if eof($fh);
    }
}

close(CMD_CUT);
close(CMD_ERR);