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sub read
...
    return shmwrite($self->id, $str, $pos, $size);
  }
}
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    read ( POS, SIZE )

...
write ( STRING, POS, SIZE )

Write SIZE bytes to the shared memory segment at POS . Returns true if
+ successful, or false if there is an error. See shmwrite.
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    $shm->write(pack("S", 4711), 2, 2);
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    S  An unsigned short value.