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    $! = 0;
    $res = $sock->read($data, 255);
...
    $err = $!;
    $iologger->debug("bufrd res " . safe($res) . ": " .
             safe($data) . " err $err");

2011-10-13 09:21:39,782 DEBUG kcmdproxy.child.io(30674):366 bufrd res 
+<<127>>: <<simkserver<sp>30665<sp>port<sp>2001<sp>client<sp>127.0.0.1
+<sp>command<sp>special<lf>1,8,7,2,13,1,12<lf>13,5,11,10,8,0,13<lf>5,2
+,11,4,5,10,5<lf>3,5,7,10,12,2,12<lf>>> err Resource temporarily unava
+ilable