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...
[pid 27966] write(4, "58\n", 3)         = -1 EPIPE (Broken pipe)
...
Process 27968 detached
<... futex resumed> )                   = ? ERESTARTSYS (To be restart
+ed)
+++ killed by SIGPIPE +++

    ...
        for ($second=60; $second>0; --$second) {
...
        }
        close $client;
    ...