Whitespace corrections for LibUSB manual page (1/2).
MFC after: 1 week Approved by: re (kib) PR: docs/159898
This commit is contained in:
parent
15523cf799
commit
c8c1f2ec4d
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=225090
@ -31,134 +31,99 @@
|
||||
.Os
|
||||
.Sh NAME
|
||||
.Nm libusb
|
||||
.
|
||||
.Nd "USB access library"
|
||||
.
|
||||
.
|
||||
.Sh LIBRARY
|
||||
.
|
||||
.
|
||||
USB access library (libusb -lusb)
|
||||
.
|
||||
.
|
||||
.Sh SYNOPSIS
|
||||
.
|
||||
.
|
||||
.In libusb.h
|
||||
.
|
||||
.
|
||||
.Sh DESCRIPTION
|
||||
The
|
||||
.Nm
|
||||
library contains interfaces for directly managing a usb device.
|
||||
The current implementation supports v1.0 of the libusb API.
|
||||
.
|
||||
.
|
||||
.Sh LIBRARY INITIALISATION / DEINITIALISATION
|
||||
.
|
||||
.Pp
|
||||
.
|
||||
.Ft int
|
||||
.Fn libusb_init libusb_context **ctx
|
||||
This function initialises libusb. Must be called at the beginning
|
||||
of the program. This function returns 0 on success or LIBUSB_ERROR on
|
||||
This function initialises libusb.
|
||||
Must be called at the beginning
|
||||
of the program.
|
||||
This function returns 0 on success or LIBUSB_ERROR on
|
||||
failure.
|
||||
.
|
||||
.Pp
|
||||
.
|
||||
.Ft void
|
||||
.Fn libusb_exit "libusb_context *ctx"
|
||||
Deinitialise libusb. Must be called at the end of the application.
|
||||
.
|
||||
Deinitialise libusb.
|
||||
Must be called at the end of the application.
|
||||
.Pp
|
||||
.
|
||||
.Ft const char *
|
||||
.Fn libusb_strerror "int code"
|
||||
Get ASCII representation of the error given by the
|
||||
.Fa code
|
||||
argument.
|
||||
.
|
||||
.
|
||||
.Pp
|
||||
.
|
||||
.Ft void
|
||||
.Fn libusb_set_debug "libusb_context *ctx" "int level"
|
||||
Set debug to the
|
||||
.Fa level
|
||||
level.
|
||||
.
|
||||
.Pp
|
||||
.
|
||||
.Ft ssize_t
|
||||
.Fn libusb_get_device_list "libusb_context *ctx" "libusb_device ***list"
|
||||
Fill into
|
||||
.Fa list
|
||||
the list of usb device available. All the device created by this
|
||||
function must be unref and free when you are done with them. This
|
||||
the list of usb device available.
|
||||
All the device created by this
|
||||
function must be unref and free when you are done with them.
|
||||
This
|
||||
function returns the number of devices in list or a LIBUSB_ERROR code.
|
||||
.
|
||||
.Pp
|
||||
.
|
||||
.Ft void
|
||||
.Fn libusb_free_device_list "libusb_device **list" "int unref_devices"
|
||||
Free the list of devices discovered by libusb_get_device_list. If
|
||||
Free the list of devices discovered by libusb_get_device_list.
|
||||
If
|
||||
.Fa unref_device
|
||||
is set to 1 all devices are unref one time.
|
||||
.
|
||||
.Pp
|
||||
.
|
||||
.Ft uint8_t
|
||||
.Fn libusb_get_bus_number "libusb_device *dev"
|
||||
Returns the number of the bus contained by the device
|
||||
.Fa dev.
|
||||
.
|
||||
.Pp
|
||||
.
|
||||
.Ft uint8_t
|
||||
.Fn libusb_get_device_address "libusb_device *dev"
|
||||
Returns the device_address contained by the device
|
||||
.Fa dev.
|
||||
.
|
||||
.Pp
|
||||
.
|
||||
.Ft enum libusb_speed
|
||||
.Fn libusb_get_device_speed "libusb_device *dev"
|
||||
Returns the wire speed at which the device is connected.
|
||||
See the LIBUSB_SPEED_XXX enums for more information.
|
||||
LIBUSB_SPEED_UNKNOWN is returned in case of unknown wire speed.
|
||||
.
|
||||
.Pp
|
||||
.
|
||||
.Ft int
|
||||
.Fn libusb_get_max_packet_size "libusb_device *dev" "unsigned char endpoint"
|
||||
Returns the wMaxPacketSize value on success, LIBUSB_ERROR_NOT_FOUND if the
|
||||
endpoint does not exist and LIBUSB_ERROR_OTHERS on other failure.
|
||||
.
|
||||
.Pp
|
||||
.
|
||||
.Ft libusb_device *
|
||||
.Fn libusb_ref_device "libusb_device *dev"
|
||||
Increment the reference counter of the device
|
||||
.Fa dev.
|
||||
.
|
||||
.Pp
|
||||
.
|
||||
.Ft void
|
||||
.Fn libusb_unref_device "libusb_device *dev"
|
||||
Decrement the reference counter of the device
|
||||
.Fa dev.
|
||||
.
|
||||
.Pp
|
||||
.
|
||||
.Ft int
|
||||
.Fn libusb_open "libusb_device *dev" "libusb_device_handle **devh"
|
||||
Open a device and obtain a device_handle. Returns 0 on success,
|
||||
Open a device and obtain a device_handle.
|
||||
Returns 0 on success,
|
||||
LIBUSB_ERROR_NO_MEM on memory allocation problem, LIBUSB_ERROR_ACCESS
|
||||
on permission problem, LIBUSB_ERROR_NO_DEVICE if the device has been
|
||||
disconnected and a LIBUSB_ERROR code on error.
|
||||
.
|
||||
.Pp
|
||||
.
|
||||
.Ft libusb_device_handle *
|
||||
.Fn libusb_open_device_with_vid_pid "libusb_context *ctx" "uint16_t vid" "uint16_t pid"
|
||||
Convenience function to open a device with is
|
||||
@ -166,30 +131,23 @@ Convenience function to open a device with is
|
||||
and
|
||||
.Fa pid.
|
||||
Returns NULL on error.
|
||||
.
|
||||
.Pp
|
||||
.
|
||||
.Ft void
|
||||
.Fn libusb_close "libusb_device_handle *devh"
|
||||
Close a device handle.
|
||||
.
|
||||
.Pp
|
||||
.
|
||||
.Ft libusb_device *
|
||||
.Fn libusb_get_device "libusb_device_handle *devh"
|
||||
Get the device contained by devh.
|
||||
Returns NULL on error.
|
||||
.
|
||||
.Pp
|
||||
.
|
||||
.Ft int
|
||||
.Fn libusb_get_configuration "libusb_device_handle *devh" "int *config"
|
||||
Returns the bConfiguration value of the current configuration. Returns 0
|
||||
Returns the bConfiguration value of the current configuration.
|
||||
Returns 0
|
||||
on success, LIBUSB_ERROR_NO_DEVICE if the device has been disconnected
|
||||
and a LIBUSB_ERROR code on error.
|
||||
.
|
||||
.Pp
|
||||
.
|
||||
.Ft int
|
||||
.Fn libusb_set_configuration "libusb_device_handle *devh" "int config"
|
||||
Set the active configuration
|
||||
@ -200,70 +158,63 @@ This function returns 0 on success, LIBUSB_ERROR_NOT_FOUND if the requested
|
||||
configuration does not exist, LIBUSB_ERROR_BUSY if the interfaces are currently
|
||||
claimed, LIBUSB_ERROR_NO_DEVICE if the device has been disconnected and a
|
||||
LIBUSB_ERROR code on failure.
|
||||
.
|
||||
.Pp
|
||||
.
|
||||
.Ft int
|
||||
.Fn libusb_claim_interface "libusb_device_handle *devh" "int interface_number"
|
||||
Claim an interface in a given libusb_handle
|
||||
.Fa devh.
|
||||
This is a non-blocking function. It returns 0 success, LIBUSB_ERROR_NOT_FOUND
|
||||
This is a non-blocking function.
|
||||
It returns 0 success, LIBUSB_ERROR_NOT_FOUND
|
||||
if the requested interface does not exist, LIBUSB_ERROR_BUSY if a program or
|
||||
driver has claimed the interface, LIBUSB_ERROR_NO_DEVICE if the device has
|
||||
been disconnected and a LIBUSB_ERROR code on failure.
|
||||
.
|
||||
.Pp
|
||||
.
|
||||
.Ft int
|
||||
.Fn libusb_release_interface "libusb_device_handle *devh" "int interface_number"
|
||||
This function release an interface. All the claimed interface must be released
|
||||
before closing a device. Returns 0 on success, LIBUSB_ERROR_NOT_FOUND if the
|
||||
This function release an interface.
|
||||
All the claimed interface must be released
|
||||
before closing a device.
|
||||
Returns 0 on success, LIBUSB_ERROR_NOT_FOUND if the
|
||||
interface was not claimed, LIBUSB_ERROR_NO_DEVICE if the device has been
|
||||
disconnected and LIBUSB_ERROR on failure.
|
||||
.
|
||||
.Pp
|
||||
.
|
||||
.Ft int
|
||||
.Fn libusb_set_interface_alt_setting "libusb_device_handle *dev" "int interface_number" "int alternate_setting"
|
||||
Activate an alternate setting for an interface. Returns 0 on success,
|
||||
Activate an alternate setting for an interface.
|
||||
Returns 0 on success,
|
||||
LIBUSB_ERROR_NOT_FOUND if the interface was not claimed or the requested
|
||||
setting does not exist, LIBUSB_ERROR_NO_DEVICE if the device has been
|
||||
disconnected and LIBUSB_ERROR code on failure.
|
||||
.
|
||||
.Pp
|
||||
.
|
||||
.Ft int
|
||||
.Fn libusb_clear_halt "libusb_device_handle *devh" "unsigned char endpoint"
|
||||
Clear an halt/stall for a endpoint. Returns 0 on success, LIBUSB_ERROR_NOT_FOUND
|
||||
Clear an halt/stall for a endpoint.
|
||||
Returns 0 on success, LIBUSB_ERROR_NOT_FOUND
|
||||
if the endpoint does not exist, LIBUSB_ERROR_NO_DEVICE if the device has been
|
||||
disconnected and a LIBUSB_ERROR code on failure.
|
||||
.
|
||||
.Pp
|
||||
.
|
||||
.Ft int
|
||||
.Fn libusb_reset_device "libusb_device_handle *devh"
|
||||
Perform an USB port reset for an usb device. Returns 0 on success,
|
||||
Perform an USB port reset for an usb device.
|
||||
Returns 0 on success,
|
||||
LIBUSB_ERROR_NOT_FOUND if re-enumeration is required or if the device has
|
||||
been disconnected and a LIBUSB_ERROR code on failure.
|
||||
.
|
||||
.Pp
|
||||
.
|
||||
.Ft int
|
||||
.Fn libusb_check_connected "libusb_device_handle *devh"
|
||||
Test if USB device is still connected. Returns 0 on success,
|
||||
Test if USB device is still connected.
|
||||
Returns 0 on success,
|
||||
LIBUSB_ERROR_NO_DEVICE if has been disconnected and a LIBUSB_ERROR
|
||||
code on failure.
|
||||
.
|
||||
.Pp
|
||||
.
|
||||
.Ft int
|
||||
.Fn libusb_kernel_driver_active "libusb_device_handle *devh" "int interface"
|
||||
Determine if a driver is active on a interface. Returns 0 if no kernel driver
|
||||
is active, returns 1 if a kernel driver is active, returns LIBUSB_ERROR_NO_DEVICE
|
||||
Determine if a driver is active on a interface.
|
||||
Returns 0 if no kernel driver
|
||||
is active, returns 1 if a kernel driver is active,
|
||||
returns LIBUSB_ERROR_NO_DEVICE
|
||||
if the device has been disconnected and returns a LIBUSB_ERROR code on failure.
|
||||
.
|
||||
.Pp
|
||||
.
|
||||
.Ft int
|
||||
.Fn libusb_get_driver "libusb_device_handle *devh" "int interface" "char *name" "int namelen"
|
||||
or
|
||||
@ -284,9 +235,7 @@ This function is non-portable.
|
||||
The buffer pointed to by
|
||||
.Fa name
|
||||
is only zero terminated on success.
|
||||
.
|
||||
.Pp
|
||||
.
|
||||
.Ft int
|
||||
.Fn libusb_detach_kernel_driver "libusb_device_handle *devh" "int interface"
|
||||
or
|
||||
@ -295,38 +244,37 @@ or
|
||||
Detach a kernel driver from an interface.
|
||||
This is needed to claim an interface required by a kernel driver.
|
||||
Returns 0 on success, LIBUSB_ERROR_NOT_FOUND if no kernel driver was active,
|
||||
LIBUSB_ERROR_INVALID_PARAM if the interface does not exist, LIBUSB_ERROR_NO_DEVICE if the device has been disconnected and a LIBUSB_ERROR code on failure. This function is non-portable.
|
||||
.
|
||||
LIBUSB_ERROR_INVALID_PARAM if the interface does not exist,
|
||||
LIBUSB_ERROR_NO_DEVICE if the device has been disconnected
|
||||
and a LIBUSB_ERROR code on failure.
|
||||
This function is non-portable.
|
||||
.Pp
|
||||
.
|
||||
.Ft int
|
||||
.Fn libusb_attach_kernel_driver "libusb_device_handle *devh" "int interface"
|
||||
Re-attach an interface kernel driver previously detached. Returns 0 on success,
|
||||
LIBUSB_ERROR_INVALID_PARAM if the interface does not exist, LIBUSB_ERROR_NO_DEVICE
|
||||
Re-attach an interface kernel driver previously detached.
|
||||
Returns 0 on success,
|
||||
LIBUSB_ERROR_INVALID_PARAM if the interface does not exist,
|
||||
LIBUSB_ERROR_NO_DEVICE
|
||||
if the device has been disconnect, LIBUSB_ERROR_BUSY if the driver cannot be
|
||||
attached because the interface is claimed by a program or driver and a
|
||||
LIBUSB_ERROR code on failure.
|
||||
.
|
||||
.Pp
|
||||
.
|
||||
.Sh USB DESCRIPTORS
|
||||
.
|
||||
.Pp
|
||||
.
|
||||
.Ft int
|
||||
.Fn libusb_get_device_descriptor "libusb_device *dev" "libusb_device_descriptor *desc"
|
||||
Get the USB device descriptor for the device
|
||||
.Fa dev.
|
||||
This is a non-blocking function. Returns 0 on success and a LIBUSB_ERROR code on
|
||||
This is a non-blocking function.
|
||||
Returns 0 on success and a LIBUSB_ERROR code on
|
||||
failure.
|
||||
.
|
||||
.Pp
|
||||
.Ft int
|
||||
.Fn libsub_get_active_config_descriptor "libusb_device *dev" "struct libusb_config_descriptor **config"
|
||||
Get the USB configuration descriptor for the active configuration. Returns 0 on
|
||||
Get the USB configuration descriptor for the active configuration.
|
||||
Returns 0 on
|
||||
success, returns LIBUSB_ERROR_NOT_FOUND if the device is in unconfigured state
|
||||
and returns another LIBUSB_ERROR code on error.
|
||||
.
|
||||
.Pp
|
||||
.Ft int
|
||||
.Fn libusb_get_config_descriptor "libusb_device *dev" "uint8_t config_index" "libusb_config_descriptor **config"
|
||||
@ -334,30 +282,28 @@ Get USB configuration descriptor based on its index
|
||||
.Fa idx.
|
||||
Returns 0 on success, LIBUSB_ERROR_NOT_FOUND if the configuration does not exist
|
||||
and returns another LIBUSB_ERROR code on error.
|
||||
.
|
||||
.Pp
|
||||
.Ft int
|
||||
.Fn libusb_get_config_descriptor_by_value "libusb_device *dev" "uint8 bConfigurationValue" "libusb_config_descriptor **config"
|
||||
Get a USB configuration descriptor with a specific bConfigurationValue. This is
|
||||
a non-blocking function which does not send request through the device. Returns 0
|
||||
on success, LIBUSB_ERROR_NOT_FOUND if the configuration does not exist and another
|
||||
Get a USB configuration descriptor with a specific bConfigurationValue.
|
||||
This is
|
||||
a non-blocking function which does not send request through the device.
|
||||
Returns 0
|
||||
on success, LIBUSB_ERROR_NOT_FOUND if the configuration
|
||||
does not exist and another
|
||||
LIBUSB_ERROR code on failure.
|
||||
.
|
||||
.Pp
|
||||
.Ft void
|
||||
.Fn libusb_free_config_descriptor "libusb_config_descriptor *config"
|
||||
Free a configuration descriptor.
|
||||
.
|
||||
.Pp
|
||||
.Ft int
|
||||
.Fn libusb_get_string_descriptor_ascii "libusb_device_handle *devh" "uint8_t desc_idx" "unsigned char *data" "int length"
|
||||
Retrieve a string descriptor in C style ascii.
|
||||
Returns a positive number of bytes in the resulting ASCII string on success and a LIBUSB_ERROR code on failure.
|
||||
.
|
||||
Returns a positive number of bytes in the resulting ASCII string
|
||||
on success and a LIBUSB_ERROR code on failure.
|
||||
.Pp
|
||||
.
|
||||
.Sh USB ASYNCHRONOUS I/O
|
||||
.
|
||||
.Pp
|
||||
.Ft struct libusb_transfer *
|
||||
.Fn libusb_alloc_transfer "int iso_packets"
|
||||
@ -365,28 +311,24 @@ Allocate a transfer with
|
||||
.Fa iso_packets
|
||||
numbers of isochronous packet descriptors.
|
||||
Returns NULL on error.
|
||||
.
|
||||
.Pp
|
||||
.Ft void
|
||||
.Fn libusb_free_transfer "struct libusb_transfer *tr"
|
||||
Free a transfer.
|
||||
.
|
||||
.Pp
|
||||
.Ft int
|
||||
.Fn libusb_submit_transfer "struct libusb_transfer *tr"
|
||||
This function will submit a transfer and returns immediately.
|
||||
Returns 0 on success, LIBUSB_ERROR_NO_DEVICE if the device has been disconnected and
|
||||
Returns 0 on success, LIBUSB_ERROR_NO_DEVICE if
|
||||
the device has been disconnected and
|
||||
LIBUSB_ERROR code on other failure.
|
||||
.
|
||||
.Pp
|
||||
.Ft int
|
||||
.Fn libusb_cancel_transfer "struct libusb_transfer *tr"
|
||||
This function asynchronously cancel a transfer.
|
||||
Returns 0 on success and LIBUSB_ERROR code on failure.
|
||||
.
|
||||
.Pp
|
||||
.Sh USB SYNCHRONOUS I/O
|
||||
.
|
||||
.Pp
|
||||
.Ft int
|
||||
.Fn libusb_control_transfer "libusb_device_handle *devh" "uint8_t bmRequestType" "uint8_t bRequest" "uint16_t wValue" "uint16_t wIndex" "unsigned char *data" "uint16_t wLength" "unsigned int timeout"
|
||||
@ -400,7 +342,6 @@ LIBUSB_ERROR_TIMEOUT if the transfer timeout, LIBUSB_ERROR_PIPE if the
|
||||
control request was not supported, LIBUSB_ERROR_NO_DEVICE if the
|
||||
device has been disconnected or another LIBUSB_ERROR code on other failures.
|
||||
The libusb error codes are always negative.
|
||||
.
|
||||
.Pp
|
||||
.Ft int
|
||||
.Fn libusb_bulk_transfer "struct libusb_device_handle *devh" "unsigned char endpoint" "unsigned char *data" "int length" "int *transferred" "unsigned int timeout"
|
||||
@ -412,7 +353,6 @@ if the transfer timeout, LIBUSB_ERROR_PIPE if the control request was not
|
||||
supported, LIBUSB_ERROR_OVERFLOW if the device offered more data,
|
||||
LIBUSB_ERROR_NO_DEVICE if the device has been disconnected and
|
||||
LIBUSB_ERROR code on other failure.
|
||||
.
|
||||
.Pp
|
||||
.Ft int
|
||||
.Fn libusb_interrupt_transfer "struct libusb_device_handle *devh" "unsigned char endpoint" "unsigned char *data" "int length" "int *transferred" "unsigned int timeout"
|
||||
@ -424,101 +364,99 @@ if the transfer timeout, LIBUSB_ERROR_PIPE if the control request was not
|
||||
supported, LIBUSB_ERROR_OVERFLOW if the device offered more data,
|
||||
LIBUSB_ERROR_NO_DEVICE if the device has been disconnected and
|
||||
LIBUSB_ERROR code on other failure.
|
||||
.
|
||||
.Pp
|
||||
.Sh USB EVENTS
|
||||
.
|
||||
.Pp
|
||||
.Ft int
|
||||
.Fn libusb_try_lock_events "libusb_context *ctx"
|
||||
Try to acquire the event handling lock.
|
||||
Returns 0 if the lock was obtained and 1 if not.
|
||||
.
|
||||
.Pp
|
||||
.Ft void
|
||||
.Fn libusb_lock_events "libusb_context *ctx"
|
||||
Acquire the event handling lock. This function is blocking.
|
||||
.
|
||||
Acquire the event handling lock.
|
||||
This function is blocking.
|
||||
.Pp
|
||||
.Ft void
|
||||
.Fn libusb_unlock_events "libusb_context *ctx"
|
||||
Release the event handling lock. This will wake up any thread blocked
|
||||
Release the event handling lock.
|
||||
This will wake up any thread blocked
|
||||
on libusb_wait_for_event().
|
||||
.
|
||||
.Pp
|
||||
.Ft int
|
||||
.Fn libusb_event_handling_ok "libusb_context *ctx"
|
||||
Determine if it still OK for this thread to be doing event handling. Returns 1
|
||||
if event handling can start or continue. Returns 0 if this thread must give up
|
||||
Determine if it still OK for this thread to be doing event handling.
|
||||
Returns 1
|
||||
if event handling can start or continue.
|
||||
Returns 0 if this thread must give up
|
||||
the events lock.
|
||||
.
|
||||
.Pp
|
||||
.Ft int
|
||||
.Fn libusb_event_handler_active "libusb_context *ctx"
|
||||
Determine if an active thread is handling events. Returns 1 if yes and 0 if there
|
||||
Determine if an active thread is handling events.
|
||||
Returns 1 if yes and 0 if there
|
||||
are no threads currently handling events.
|
||||
.
|
||||
.Pp
|
||||
.Ft void
|
||||
.Fn libusb_lock_event_waiters "libusb_context *ctx"
|
||||
Acquire the event_waiters lock. This lock is designed to be obtained under the
|
||||
Acquire the event_waiters lock.
|
||||
This lock is designed to be obtained under the
|
||||
situation where you want to be aware when events are completed, but some other
|
||||
thread is event handling so calling libusb_handle_events() is not allowed.
|
||||
.
|
||||
.Pp
|
||||
.Ft void
|
||||
.Fn libusb_unlock_event_waiters "libusb_context *ctx"
|
||||
Release the event_waiters lock.
|
||||
.
|
||||
.Pp
|
||||
.Ft int
|
||||
.Fn libusb_wait_for_event "libusb_context *ctx" "struct timeval *tv"
|
||||
Wait for another thread to signal completion of an event. Must be called
|
||||
with the event waiters lock held, see libusb_lock_event_waiters(). This will
|
||||
Wait for another thread to signal completion of an event.
|
||||
Must be called
|
||||
with the event waiters lock held, see libusb_lock_event_waiters().
|
||||
This will
|
||||
block until the timeout expires or a transfer completes or a thread releases
|
||||
the event handling lock through libusb_unlock_events(). Returns 0 after a
|
||||
the event handling lock through libusb_unlock_events().
|
||||
Returns 0 after a
|
||||
transfer completes or another thread stops event handling, returns 1 if the
|
||||
timeout expired.
|
||||
.
|
||||
.Pp
|
||||
.Ft int
|
||||
.Fn libusb_handle_events_timeout "libusb_context *ctx" "struct timeval *tv"
|
||||
Handle any pending events by checking if timeouts have expired and by
|
||||
checking the set of file descriptors for activity. Returns 0 on success, or a
|
||||
checking the set of file descriptors for activity.
|
||||
Returns 0 on success, or a
|
||||
LIBUSB_ERROR code on failure.
|
||||
.
|
||||
.Pp
|
||||
.Ft int
|
||||
.Fn libusb_handle_events "libusb_context *ctx"
|
||||
Handle any pending events in blocking mode with a sensible timeout. Returns 0
|
||||
Handle any pending events in blocking mode with a sensible timeout.
|
||||
Returns 0
|
||||
on success, returns a LIBUSB_ERROR code on failure.
|
||||
.
|
||||
.Pp
|
||||
.Ft int
|
||||
.Fn libusb_handle_events_locked "libusb_context *ctx" "struct timeval *tv"
|
||||
Handle any pending events by polling file desciptors, without checking if
|
||||
another threads are already doing so. Must be called with the event lock held.
|
||||
.
|
||||
another threads are already doing so.
|
||||
Must be called with the event lock held.
|
||||
.Pp
|
||||
.Ft int
|
||||
.Fn libusb_get_next_timeout "libusb_context *ctx" "struct timeval *tv"
|
||||
Determine the next internal timeout that libusb needs to handle. Returns 0
|
||||
Determine the next internal timeout that libusb needs to handle.
|
||||
Returns 0
|
||||
if there are no pending timeouts, 1 if a timeout was returned, or LIBUSB_ERROR
|
||||
code on failure.
|
||||
.
|
||||
.Pp
|
||||
.Ft void
|
||||
.Fn libusb_set_pollfd_notifiers "libusb_context *ctx" "libusb_pollfd_added_cb added_cb" "libusb_pollfd_removed_cb remove_cb" "void *user_data"
|
||||
Register notification functions for file descriptor additions/removals.
|
||||
These functions will be invoked for every new or removed file descriptor
|
||||
that libusb uses as an event source.
|
||||
.
|
||||
.Pp
|
||||
.Ft const struct libusb_pollfd **
|
||||
.Fn libusb_get_pollfds "libusb_context *ctx"
|
||||
Retrive a list of file descriptors that should be polled by your main loop as
|
||||
libusb event sources. Returns a NULL-terminated list on success or NULL on failure.
|
||||
.
|
||||
libusb event sources.
|
||||
Returns a NULL-terminated list on success or NULL on failure.
|
||||
.Sh LIBUSB VERSION 0.1 COMPATIBILITY
|
||||
.Pp
|
||||
The library is also compliant with LibUSB version 0.1.12.
|
||||
@ -555,16 +493,13 @@ The library is also compliant with LibUSB version 0.1.12.
|
||||
.Fn usb_check_connected
|
||||
.Fn usb_get_driver_np
|
||||
.Fn usb_detach_kernel_driver_np
|
||||
.
|
||||
.Sh SEE ALSO
|
||||
.Xr libusb20 3 ,
|
||||
.Xr usb 4 ,
|
||||
.Xr usbconfig 8
|
||||
.Pp
|
||||
.Pa http://libusb.sourceforge.net/
|
||||
.
|
||||
.Sh HISTORY
|
||||
.
|
||||
.Nm
|
||||
support first appeared in
|
||||
.Fx 8.0 .
|
||||
|
Loading…
Reference in New Issue
Block a user