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     */
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     */
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    fibril_rwlock_t lock;
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    fibril_rwlock_t lock;
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};
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};
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/** Finds the device specific data.
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/** Finds the device specific data.
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 *  @param device_id The device identifier. Input parameter.
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 *  @param[in] device_id The device identifier.
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 *  @param device The device specific data. Output parameter.
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 *  @param[out] device The device specific data.
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 *  @returns EOK on success.
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 *  @returns EOK on success.
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 *  @returns ENOENT if device is not found.
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 *  @returns ENOENT if device is not found.
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 *  @returns EPERM if the device is not initialized.
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 *  @returns EPERM if the device is not initialized.
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 */
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 */
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int find_device( device_id_t device_id, device_ref * device );
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int find_device( device_id_t device_id, device_ref * device );
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/** Clears the usage statistics.
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/** Clears the usage statistics.
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 *  @param stats The usage statistics. Input parameter.
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 *  @param[in] stats The usage statistics.
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 */
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 */
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void    null_device_stats( device_stats_ref stats );
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void    null_device_stats( device_stats_ref stats );
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// prepared for future optimalizations
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// prepared for future optimalizations
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/** Releases the given packet.
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/** Releases the given packet.
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 *  @param packet_id The packet identifier. Input parameter.
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 *  @param[in] packet_id The packet identifier.
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 */
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 */
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void    netif_pq_release( packet_id_t packet_id );
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void    netif_pq_release( packet_id_t packet_id );
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/** Allocates new packet to handle the given content size.
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/** Allocates new packet to handle the given content size.
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 *  @param content The minimum content size. Input parameter.
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 *  @param[in] content The minimum content size.
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 *  @returns The allocated packet.
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 *  @returns The allocated packet.
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 *  @returns NULL if there is an error.
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 *  @returns NULL if there is an error.
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 */
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 */
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packet_t netif_packet_get_1( size_t content );
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packet_t netif_packet_get_1( size_t content );
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/** Processes the netif module messages.
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/** Processes the netif module messages.
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 *  @param callid The message identifier. Input parameter.
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 *  @param[in] callid The message identifier.
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 *  @param call The message parameters. Input parameter.
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 *  @param[in] call The message parameters.
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 *  @param answer The message answer parameters. Output parameter.
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 *  @param[out] answer The message answer parameters.
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 *  @param answer_count The last parameter for the actual answer in the answer parameter. Output parameter.
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 *  @param[out] answer_count The last parameter for the actual answer in the answer parameter.
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 *  @returns EOK on success.
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 *  @returns EOK on success.
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 *  @returns ENOTSUP if the message is not known.
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 *  @returns ENOTSUP if the message is not known.
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 *  @returns Other error codes as defined for each specific module message function.
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 *  @returns Other error codes as defined for each specific module message function.
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 *  @see netif_interface.h
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 *  @see netif_interface.h
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 *  @see IS_NET_NETIF_MESSAGE()
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 *  @see IS_NET_NETIF_MESSAGE()
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 */
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 */
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int netif_message( ipc_callid_t callid, ipc_call_t * call, ipc_call_t * answer, int * answer_count );
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int netif_message( ipc_callid_t callid, ipc_call_t * call, ipc_call_t * answer, int * answer_count );
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/** Initializes the netif module.
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/** Initializes the netif module.
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 *  The function has to be defined in each module.
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 *  The function has to be defined in each module.
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 *  @param client_connection The client connection functio to be registered. Input parameter.
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 *  @param[in] client_connection The client connection functio to be registered.
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 *  @returns EOK on success.
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 *  @returns EOK on success.
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 *  @returns Other error codes as defined for each specific module message function.
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 *  @returns Other error codes as defined for each specific module message function.
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 */
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 */
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int netif_init_module( async_client_conn_t client_connection );
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int netif_init_module( async_client_conn_t client_connection );
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