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LIBUSB20(3)		 BSD Library Functions Manual		   LIBUSB20(3)

NAME
     libusb20 — USB access library

LIBRARY
     USB access library (libusb -lusb)

SYNOPSIS
     #include <libusb20.h>

     int
     libusb20_tr_close(struct libusb20_transfer *xfer);

     int
     libusb20_tr_open(struct libusb20_transfer *xfer, uint32_t max_buf_size,
	 uint32_t max_frame_count, uint8_t ep_no);

     struct libusb20_transfer*
     libusb20_tr_get_pointer(struct libusb20_device *pdev, uint16_t tr_index);

     uint16_t
     libusb20_tr_get_time_complete(struct libusb20_transfer *xfer);

     uint32_t
     libusb20_tr_get_actual_frames(struct libusb20_transfer *xfer);

     uint32_t
     libusb20_tr_get_actual_length(struct libusb20_transfer *xfer);

     uint32_t
     libusb20_tr_get_max_frames(struct libusb20_transfer *xfer);

     uint32_t
     libusb20_tr_get_max_packet_length(struct libusb20_transfer *xfer);

     uint32_t
     libusb20_tr_get_max_total_length(struct libusb20_transfer *xfer);

     uint8_t
     libusb20_tr_get_status(struct libusb20_transfer *xfer);

     uint8_t
     libusb20_tr_pending(struct libusb20_transfer *xfer);

     void
     libusb20_tr_callback_wrapper(struct libusb20_transfer *xfer);

     void
     libusb20_tr_clear_stall_sync(struct libusb20_transfer *xfer);

     void
     libusb20_tr_drain(struct libusb20_transfer *xfer);

     void
     libusb20_tr_set_buffer(struct libusb20_transfer *xfer, void *buffer,
	 uint16_t fr_index);

     void
     libusb20_tr_set_callback(struct libusb20_transfer *xfer,
	 libusb20_tr_callback_t *cb);

     void
     libusb20_tr_set_flags(struct libusb20_transfer *xfer, uint8_t flags);

     uint32_t
     libusb20_tr_get_length(struct libusb20_transfer *xfer,
	 uint16_t fr_index);

     void
     libusb20_tr_set_length(struct libusb20_transfer *xfer, uint32_t length,
	 uint16_t fr_index);

     void
     libusb20_tr_set_priv_sc0(struct libusb20_transfer *xfer, void *sc0);

     void
     libusb20_tr_set_priv_sc1(struct libusb20_transfer *xfer, void *sc1);

     void
     libusb20_tr_set_timeout(struct libusb20_transfer *xfer,
	 uint32_t timeout);

     void
     libusb20_tr_set_total_frames(struct libusb20_transfer *xfer,
	 uint32_t nframes);

     void
     libusb20_tr_setup_bulk(struct libusb20_transfer *xfer, void *pbuf,
	 uint32_t length, uint32_t timeout);

     void
     libusb20_tr_setup_control(struct libusb20_transfer *xfer, void *psetup,
	 void *pbuf, uint32_t timeout);

     void
     libusb20_tr_setup_intr(struct libusb20_transfer *xfer, void *pbuf,
	 uint32_t length, uint32_t timeout);

     void
     libusb20_tr_setup_isoc(struct libusb20_transfer *xfer, void *pbuf,
	 uint32_t length, uint61_t fr_index);

     uint8_t
     libusb20_tr_bulk_intr_sync(struct libusb20_transfer *xfer, void *pbuf,
	 uint32_t length, uint32_t *pactlen, uint32_t timeout);

     void
     libusb20_tr_start(struct libusb20_transfer *xfer);

     void
     libusb20_tr_stop(struct libusb20_transfer *xfer);

     void
     libusb20_tr_submit(struct libusb20_transfer *xfer);

     void *
     libusb20_tr_get_priv_sc0(struct libusb20_transfer *xfer);

     void *
     libusb20_tr_get_priv_sc1(struct libusb20_transfer *xfer);

     const char *
     libusb20_dev_get_backend_name(struct libusb20_device *);

     int
     libusb20_dev_get_info(struct libusb20_device *pdev,
	 struct usb_device_info *pinfo);

     int
     libusb20_dev_get_iface_desc(struct libusb20_device *pdev,
	 uint8_t iface_index, char *buf, uint8_t len);

     const char *
     libusb20_dev_get_desc(struct libusb20_device *pdev);

     int
     libusb20_dev_close(struct libusb20_device *pdev);

     int
     libusb20_dev_detach_kernel_driver(struct libusb20_device *pdev,
	 uint8_t iface_index);

     int
     libusb20_dev_set_config_index(struct libusb20_device *pdev,
	 uint8_t configIndex);

     int
     libusb20_dev_get_debug(struct libusb20_device *pdev);

     int
     libusb20_dev_get_fd(struct libusb20_device *pdev);

     int
     libusb20_dev_kernel_driver_active(struct libusb20_device *pdev,
	 uint8_t iface_index);

     int
     libusb20_dev_open(struct libusb20_device *pdev, uint16_t transfer_max);

     int
     libusb20_dev_process(struct libusb20_device *pdev);

     int
     libusb20_dev_request_sync(struct libusb20_device *pdev,
	 struct LIBUSB20_CONTROL_SETUP_DECODED *setup, void *data,
	 uint16_t *pactlen, uint32_t timeout, uint8_t flags);

     int
     libusb20_dev_req_string_sync(struct libusb20_device *pdev, uint8_t index,
	 uint16_t langid, void *ptr, uint16_t len);

     int
     libusb20_dev_req_string_simple_sync(struct libusb20_device *pdev,
	 uint8_t index, void *ptr, uint16_t len);

     int
     libusb20_dev_reset(struct libusb20_device *pdev);

     int
     libusb20_dev_check_connected(struct libusb20_device *pdev);

     int
     libusb20_dev_set_power_mode(struct libusb20_device *pdev,
	 uint8_t power_mode);

     uint8_t
     libusb20_dev_get_power_mode(struct libusb20_device *pdev);

     int
     libusb20_dev_set_alt_index(struct libusb20_device *pdev,
	 uint8_t iface_index, uint8_t alt_index);

     struct LIBUSB20_DEVICE_DESC_DECODED *
     libusb20_dev_get_device_desc(struct libusb20_device *pdev);

     struct libusb20_config *
     libusb20_dev_alloc_config(struct libusb20_device *pdev,
	 uint8_t config_index);

     struct libusb20_device *
     libusb20_dev_alloc(void);

     uint8_t
     libusb20_dev_get_address(struct libusb20_device *pdev);

     uint8_t
     libusb20_dev_get_bus_number(struct libusb20_device *pdev);

     uint8_t
     libusb20_dev_get_mode(struct libusb20_device *pdev);

     uint8_t
     libusb20_dev_get_speed(struct libusb20_device *pdev);

     uint8_t
     libusb20_dev_get_config_index(struct libusb20_device *pdev);

     void
     libusb20_dev_free(struct libusb20_device *pdev);

     void
     libusb20_dev_set_debug(struct libusb20_device *pdev, int debug);

     void
     libusb20_dev_wait_process(struct libusb20_device *pdev, int timeout);

     int
     libusb20_be_get_template(struct libusb20_backend *pbe, int *ptemp);

     int
     libusb20_be_set_template(struct libusb20_backend *pbe, int temp);

     int
     libusb20_be_get_dev_quirk(struct libusb20_backend *pber, uint16_t index,
	 struct libusb20_quirk *pq);

     int
     libusb20_be_get_quirk_name(struct libusb20_backend *pbe, uint16_t index,
	 struct libusb20_quirk *pq);

     int
     libusb20_be_add_dev_quirk(struct libusb20_backend *pbe,
	 struct libusb20_quirk *pq);

     int
     libusb20_be_remove_dev_quirk(struct libusb20_backend *pbe,
	 struct libusb20_quirk *pq);

     struct libusb20_backend *
     libusb20_be_alloc_default(void);

     struct libusb20_backend *
     libusb20_be_alloc_freebsd(void);

     struct libusb20_backend *
     libusb20_be_alloc_linux(void);

     struct libusb20_device *
     libusb20_be_device_foreach(struct libusb20_backend *pbe,
	 struct libusb20_device *pdev);

     void
     libusb20_be_dequeue_device(struct libusb20_backend *pbe,
	 struct libusb20_device *pdev);

     void
     libusb20_be_enqueue_device(struct libusb20_backend *pbe,
	 struct libusb20_device *pdev);

     void
     libusb20_be_free(struct libusb20_backend *pbe);

     uint8_t
     libusb20_me_get_1(const struct libusb20_me_struct *me, uint16_t off);

     uint16_t
     libusb20_me_get_2(const struct libusb20_me_struct *me, uint16_t off);

     uint16_t
     libusb20_me_encode(void *pdata, uint16_t len, const void *pdecoded);

     uint16_t
     libusb20_me_decode(const void *pdata, uint16_t len, void *pdecoded);

     const uint8_t *
     libusb20_desc_foreach(const struct libusb20_me_struct *me,
	 const uint8_t *pdesc);

DESCRIPTION
     The libusb20 library implements functions to be able to easily access and
     control USB through the USB file system interface.	 The libusb20 inter‐
     faces are specific to the FreeBSD usb stack and are not available on
     other operating systems, portable applications should consider using
     libusb(3).

USB TRANSFER OPERATIONS
     libusb20_tr_close() will release all kernel resources associated with an
     USB xfer.	This function returns zero upon success.  Non-zero return val‐
     ues indicate a LIBUSB20_ERROR value.

     libusb20_tr_open() will allocate kernel buffer resources according to
     max_buf_size and max_frame_count associated with an USB pxfer and bind
     the transfer to the specified ep_no.  max_buf_size is the minimum buffer
     size which the data transport layer has to support.  If max_buf_size is
     zero, the libusb20 library will use wMaxPacketSize to compute the buffer
     size.  This can be useful for isochronous transfers.  The actual buffer
     size can be greater than max_buf_size and is returned by
     libusb20_tr_get_max_total_length().  This function returns zero upon suc‐
     cess.  Non-zero return values indicate a LIBUSB20_ERROR value.

     libusb20_tr_get_pointer() will return a pointer to the allocated USB
     transfer according to the pdev and tr_index arguments.  This function
     returns NULL in case of failure.

     libusb20_tr_get_time_complete() will return the completion time of an USB
     transfer in millisecond units. This function is most useful for
     isochronous USB transfers when doing echo cancelling.

     libusb20_tr_get_actual_frames() will return the actual number of USB
     frames after an USB transfer completed. A value of zero means that no
     data was transferred.

     libusb20_tr_get_actual_length() will return the sum of the actual length
     for all transferred USB frames for the given USB transfer.

     libusb20_tr_get_max_frames() will return the maximum number of USB frames
     that were allocated when an USB transfer was setup for the given USB
     transfer.

     libusb20_tr_get_max_packet_length() will return the maximum packet length
     in bytes associated with the given USB transfer.  The packet length can
     be used round up buffer sizes so that short USB packets are avoided for
     proxy buffers.

     libusb20_tr_get_max_total_length() function will return the maximum value
     for the data length sum of all USB frames associated with an USB trans‐
     fer.  In case of control transfers the value returned does not include
     the length of the SETUP packet, 8 bytes, which is part of frame zero.
     The returned value of this function is always aligned to the maximum
     packet size, wMaxPacketSize, of the endpoint which the USB transfer is
     bound to.

     libusb20_tr_get_status() will return the status of an USB transfer.  Sta‐
     tus values are defined by a set of LIBUSB20_TRANSFER_XXX enums.

     libusb20_tr_pending() will return non-zero if the given USB transfer is
     pending for completion.  Else this function returns zero.

     libusb20_tr_callback_wrapper() This is an internal function used to wrap
     asynchronous USB callbacks.

     libusb20_tr_clear_stall_sync() This is an internal function used to syn‐
     chronously clear the stall on the given USB transfer.  Please see the USB
     specification for more information on stall clearing.  If the given USB
     transfer is pending when this function is called, the USB transfer will
     complete with an error after that this function has been called.

     libusb20_tr_drain() will stop the given USB transfer and will not return
     until the USB transfer has been stopped in hardware.

     libusb20_tr_set_buffer() is used to set the buffer pointer for the given
     USB transfer and fr_index.	 Typically the frame index is zero.

     libusb20_tr_set_callback() is used to set the USB callback for asynchro‐
     nous USB transfers.  The callback type is defined by libusb20_tr_call‐
     back_t.

     libusb20_tr_set_flags() is used to set various USB flags for the given
     USB transfer.

     LIBUSB20_TRANSFER_SINGLE_SHORT_NOT_OK
		   Report a short frame as error.

     LIBUSB20_TRANSFER_MULTI_SHORT_NOT_OK
		   Multiple short frames are not allowed.

     LIBUSB20_TRANSFER_FORCE_SHORT
		   All transmitted frames are short terminated.

     LIBUSB20_TRANSFER_DO_CLEAR_STALL
		   Will do a clear-stall before starting the transfer.

     libusb20_tr_get_length() returns the length of the given USB frame by
     index.  After an USB transfer is complete the USB frame length will get
     updated to the actual transferred length.

     libusb20_tr_set_length() sets the length of the given USB frame by index.

     libusb20_tr_set_priv_sc0() sets private driver pointer number zero.

     libusb20_tr_set_priv_sc1() sets private driver pointer number one.

     libusb20_tr_set_timeout() sets the timeout for the given USB transfer.  A
     timeout value of zero means no timeout.  The timeout is given in mil‐
     liseconds.

     libusb20_tr_set_total_frames() sets the total number of frames that
     should be executed when the USB transfer is submitted.  The total number
     of USB frames must be less than the maximum number of USB frames associ‐
     ated with the given USB transfer.

     libusb20_tr_setup_bulk() is a helper function for setting up a single
     frame USB BULK transfer.

     libusb20_tr_setup_control() is a helper function for setting up a single
     or dual frame USB CONTROL transfer depending on the control transfer
     length.

     libusb20_tr_setup_intr() is a helper function for setting up a single
     frame USB INTERRUPT transfer.

     libusb20_tr_setup_isoc() is a helper function for setting up a multi
     frame USB ISOCHRONOUS transfer.

     libusb20_tr_bulk_intr_sync() will perform a synchronous BULK or INTERRUPT
     transfer having length given by the length argument and buffer pointer
     given by the pbuf argument on the USB transfer given by the xfer argu‐
     ment.  If the pactlen argument is non-NULL the actual transfer length
     will be stored at the given pointer destination.  If the timeout argument
     is non-zero the transfer will timeout after the given value in millisec‐
     onds.  This function does not change the transfer flags, like short
     packet not ok.  This function returns zero on success else a
     LIBUSB20_TRANSFER_XXX value is returned.

     libusb20_tr_start() will get the USB transfer started, if not already
     started.  This function will not get the transfer queued in hardware.
     This function is non-blocking.

     libusb20_tr_stop() will get the USB transfer stopped, if not already
     stopped.  This function is non-blocking, which means that the actual stop
     can happen after the return of this function.

     libusb20_tr_submit() will get the USB transfer queued in hardware.

     libusb20_tr_get_priv_sc0() returns private driver pointer number zero
     associated with an USB transfer.

     libusb20_tr_get_priv_sc1() returns private driver pointer number one
     associated with an USB transfer.

USB DEVICE OPERATIONS
     libusb20_dev_get_backend_name() returns a zero terminated string describ‐
     ing the backend used.

     libusb20_dev_get_info() retrives the BSD specific usb_device_info struc‐
     ture into the memory location given by pinfo.  The USB device given by
     pdev must be opened before this function will succeed.  This function
     returns zero on success else a LIBUSB20_ERROR value is returned.

     libusb20_dev_get_iface_desc() retrieves the kernel interface description
     for the given USB iface_index.  The format of the USB interface descrip‐
     tion is: "drivername<unit>: <description>" The description string is
     always zero terminated.  A zero length string is written in case no
     driver is attached to the given interface.	 The USB device given by pdev
     must be opened before this function will succeed.	This function returns
     zero on success else a LIBUSB20_ERROR value is returned.

     libusb20_dev_get_desc() returns a zero terminated string describing the
     given USB device.	The format of the string is: "drivername<unit>:
     <description>"

     libusb20_dev_close() will close the given USB device.  This function
     returns zero on success else a LIBUSB20_ERROR value is returned.

     libusb20_dev_detach_kernel_driver() will try to detach the kernel driver
     for the USB interface given by iface_index.  This function returns zero
     on success else a LIBUSB20_ERROR value is returned.

     libusb20_dev_set_config_index() will try to set the configuration index
     on an USB device.	The first configuration index is zero.	The un-config‐
     ure index is 255.	This function returns zero on success else a
     LIBUSB20_ERROR value is returned.

     libusb20_dev_get_debug() returns the debug level of an USB device.

     libusb20_dev_get_fd() returns the file descriptor of the given USB
     device.  A negative value is returned when no file descriptor is present.
     The file descriptor can be used for polling purposes.

     libusb20_dev_kernel_driver_active() returns a non-zero value if a kernel
     driver is active on the given USB interface.  Else zero is returned.

     libusb20_dev_open() opens an USB device so that setting up USB transfers
     becomes possible.	The number of USB transfers can be zero which means
     only control transfers are allowed.  This function returns zero on suc‐
     cess else a LIBUSB20_ERROR value is returned.  A return value of
     LIBUSB20_ERROR_BUSY means that the device is already opened.

     libusb20_dev_process() is called to sync kernel USB transfers with user‐
     land USB transfers.  This function returns zero on success else a
     LIBUSB20_ERROR value is returned typically indicating that the given USB
     device has been detached.

     libusb20_dev_request_sync() will perform a synchronous control request on
     the given USB device.  Before this call will succeed the USB device must
     be opened.	 setup is a pointer to a decoded and host endian SETUP packet.
     data is a pointer to a data transfer buffer associated with the control
     transaction. This argument can be NULL.  pactlen is a pointer to a vari‐
     able that will hold the actual transfer length after the control transac‐
     tion is complete.	timeout is the transaction timeout given in millisec‐
     onds.  A timeout of zero means no timeout.	 flags is used to specify
     transaction flags, for example LIBUSB20_TRANSFER_SINGLE_SHORT_NOT_OK.
     This function returns zero on success else a LIBUSB20_ERROR value is
     returned.

     libusb20_dev_req_string_sync() will synchronously request an USB string
     by language ID and string index into the given buffer limited by a maxi‐
     mum length.  This function returns zero on success else a LIBUSB20_ERROR
     value is returned.

     libusb20_dev_req_string_simple_sync() will synchronously request an USB
     string using the default language ID and convert the string into ASCII
     before storing the string into the given buffer limited by a maximum
     length which includes the terminating zero.  This function returns zero
     on success else a LIBUSB20_ERROR value is returned.

     libusb20_dev_reset() will try to BUS reset the given USB device and
     restore the last set USB configuration.  This function returns zero on
     success else a LIBUSB20_ERROR value is returned.

     libusb20_dev_check_connected() will check if an opened USB device is
     still connected.  This function returns zero if the device is still con‐
     nected else a LIBUSB20_ERROR value is returned.

     libusb20_dev_set_power_mode() sets the power mode of the USB device.
     Valid power modes:

     LIBUSB20_POWER_OFF

     LIBUSB20_POWER_ON

     LIBUSB20_POWER_SAVE

     LIBUSB20_POWER_SUSPEND

     LIBUSB20_POWER_RESUME
     This function returns zero on success else a LIBUSB20_ERROR value is
     returned.

     libusb20_dev_get_power_mode() returns the currently selected power mode
     for the given USB device.

     libusb20_dev_set_alt_index() will try to set the given alternate index
     for the given USB interface index.	 This function returns zero on success
     else a LIBUSB20_ERROR value is returned.

     libusb20_dev_get_device_desc() returns a pointer to the decoded and host
     endian version of the device descriptor.  The USB device need not be
     opened when calling this function.

     libusb20_dev_alloc_config() will read out and decode the USB config
     descriptor for the given USB device and config index. This function
     returns a pointer to the decoded configuration which must eventually be
     passed to free(). NULL is returned in case of failure.

     libusb20_dev_alloc() is an internal function to allocate a new USB
     device.

     libusb20_dev_get_address() returns the internal and not necessarily the
     real hardware address of the given USB device.

     libusb20_dev_get_bus_number() returns the internal bus number which the
     given USB device belongs to.

     libusb20_dev_get_mode() returns the current operation mode of the USB
     entity.  Valid return values are:

     LIBUSB20_MODE_HOST

     LIBUSB20_MODE_DEVICE

     libusb20_dev_get_speed() returns the current speed of the given USB
     device.

     LIBUSB20_SPEED_UNKNOWN

     LIBUSB20_SPEED_LOW

     LIBUSB20_SPEED_FULL

     LIBUSB20_SPEED_HIGH

     LIBUSB20_SPEED_VARIABLE

     LIBUSB20_SPEED_SUPER

     libusb20_dev_get_config_index() This function returns the currently
     select config index for the given USB device.

     libusb20_dev_free() will free the given USB device and all associated USB
     transfers.

     libusb20_dev_set_debug() will set the debug level for the given USB
     device.

     libusb20_dev_wait_process() function will wait until a pending USB trans‐
     fer has completed on the given USB device.	 A timeout value can be speci‐
     fied which is passed on to the poll(2) function.

USB BACKEND OPERATIONS
     libusb20_be_get_template() will return the currently selected global USB
     device side mode template into the integer pointer ptemp.	This function
     returns zero on success else a LIBUSB20_ERROR value is returned.

     libusb20_be_set_template() will set the global USB device side mode tem‐
     plate to temp.  The new template is not activated until after the next
     USB enumeration.  The template number decides how the USB device will
     present itself to the USB Host, like Mass Storage Device, USB Ethernet
     Device. Also see the usb2_template(4) module.  This function returns zero
     on success else a LIBUSB20_ERROR value is returned.

     libusb20_be_get_dev_quirk() This function will return the device quirk
     according to index into the libusb20_quirk structure pointed to by pq.
     This function returns zero on success else a LIBUSB20_ERROR value is
     returned.	If the given quirk does not exist LIBUSB20_ERROR_NOT_FOUND is
     returned.

     libusb20_be_get_quirk_name() will return the quirk name according to
     index into the libusb20_quirk structure pointed to by pq.	This function
     returns zero on success else a LIBUSB20_ERROR value is returned.  If the
     given quirk does not exist LIBUSB20_ERROR_NOT_FOUND is returned.

     libusb20_be_add_dev_quirk() will add the libusb20_quirk structure pointed
     to by the pq argument into the device quirk list.	This function returns
     zero on success else a LIBUSB20_ERROR value is returned.  If the given
     quirk cannot be added LIBUSB20_ERROR_NO_MEM is returned.

     libusb20_be_remove_dev_quirk() will remove the quirk matching the
     libusb20_quirk structure pointed to by the pq argument from the device
     quirk list.  This function returns zero on success else a LIBUSB20_ERROR
     value is returned.	 If the given quirk does not exist
     LIBUSB20_ERROR_NOT_FOUND is returned.

     libusb20_be_alloc_default() libusb20_be_alloc_freebsd()
     libusb20_be_alloc_linux() These functions are used to allocate a specific
     USB backend or the operating system default USB backend. Allocating a
     backend is a way to scan for currently present USB devices.

     libusb20_be_device_foreach() is used to iterate USB devices present in a
     USB backend.  The starting value of pdev is NULL.	This function returns
     the next USB device in the list.  If NULL is returned the end of the USB
     device list has been reached.

     libusb20_be_dequeue_device() will dequeue the given USB device pointer
     from the backend USB device list.	Dequeued USB devices will not be freed
     when the backend is freed.

     libusb20_be_enqueue_device() This function will enqueue the given USB
     device pointer in the backend USB device list.  Enqueued USB devices will
     get freed when the backend is freed.

     libusb20_be_free() will free the given backend and all USB devices in its
     device list.

USB DESCRIPTOR PARSING
     libusb20_me_get_1(pie, offset) This function will return a byte at the
     given byte offset of a message entity.  This function is safe against
     invalid offsets.

     libusb20_me_get_2(pie, offset) This function will return a little endian
     16-bit value at the given byte offset of a message entity.	 This function
     is safe against invalid offsets.

     libusb20_me_encode(pbuf, len, pdecoded) This function will encode a so-
     called *DECODED structure into binary format.  The total encoded length
     that will fit in the given buffer is returned.  If the buffer pointer is
     NULL no data will be written to the buffer location.

     libusb20_me_decode(pbuf, len, pdecoded) This function will decode a
     binary structure into a so-called *DECODED structure.  The total decoded
     length is returned.  The buffer pointer cannot be NULL.

FILES
     /dev/usb

SEE ALSO
     usb(4), libusb(3), usbconfig(8)

HISTORY
     Some parts of the libusb20 API derives from the libusb project at source‐
     forge.

BSD			       October 14, 2010				   BSD
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