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/** Character input device. */
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/** Character input device. */
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struct chardev {
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struct chardev {
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    char *name;
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    char *name;
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    waitq_t wq;
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    waitq_t wq;
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    spinlock_t lock;        /**< Protects everything below. */
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    SPINLOCK_DECLARE(lock);     /**< Protects everything below. */
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    __u8 buffer[CHARDEV_BUFLEN];
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    __u8 buffer[CHARDEV_BUFLEN];
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    count_t counter;
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    count_t counter;
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    chardev_operations_t *op;   /**< Implementation of chardev operations. */
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    chardev_operations_t *op;   /**< Implementation of chardev operations. */
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    index_t index;
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    index_t index;
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    void *data;
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    void *data;