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Return status information on a URB
#include <sys/usbdi.h>
int usbd_urb_status( struct usbd_urb *urb,
_uint32 *status,
_uint32 *len )
- urb
- An opaque handle (from usbd_alloc_urb()).
- status
- Completion status (see below).
- len
- The actual length (in bytes) of the data transfer.
libusbdi
You use the usbd_urb_status() function to extract
completion status and data-transfer length from a URB.
The status field contains the completion status
information, which includes the following flags:
- USBD_STATUS_INPROG
- The operation is in progress.
- USBD_STATUS_CMP
- The operation is complete.
- USBD_STATUS_CMP_ERR
- The operation is complete, but an error occurred.
- USBD_STATUS_TIMEOUT
- The operation timed out.
- USBD_STATUS_ABORTED
- The operation aborted.
- USBD_STATUS_CRC_ERR
- The last packet from the endpoint contained a CRC error.
- USBD_STATUS_BITSTUFFING
- The last packet from the endpoint contained a bit-stuffing violation.
- USBD_STATUS_TOGGLE_MISMATCH
- The last packet from the endpoint had the wrong data-toggle PID.
- USBD_STATUS_STALL
- The endpoint returned a STALL PID.
- USBD_STATUS_DEV_NOANSWER
- Device didn't respond to token (IN) or didn't provide a handshake (OUT).
- USBD_STATUS_PID_FAILURE
- Check bits on PID from endpoint failed on data PID (IN) or handshake (OUT).
- USBD_STATUS_BAD_PID
- Receive PID was invalid or undefined.
- USBD_STATUS_DATA_OVERRUN
- The endpoint returned more data than the allowable maximum.
- USBD_STATUS_DATA_UNDERRUN
- The endpoint didn't return enough data to fill the specified buffer.
- USBD_STATUS_BUFFER_OVERRUN
- During an IN, the host controller received data from the
endpoint faster than it could be written to system memory.
- USBD_STATUS_BUFFER_UNDERRUN
- During an OUT, the host controller couldn't retrieve data fast enough.
- USBD_STATUS_NOT_ACCESSED
- Controller didn't execute request.
- EOK
- Success.
- EBUSY
- URB I/O still active.
- ETIMEDOUT
- Timeout occurred.
- EINTR
- Operation aborted/interrupted.
- ENODEV
- Device removed.
- EIO
- I/O error.
QNX Neutrino, QNX 4
Safety: | |
Cancellation point |
No |
Interrupt handler |
No |
Signal handler |
No |
Thread |
Yes |
usbd_args_lookup(),
usbd_configuration_descriptor(),
usbd_device_lookup(),
usbd_device_extra(),
usbd_device_descriptor(),
usbd_endpoint_descriptor(),
usbd_hcd_info(),
usbd_hub_descriptor(),
usbd_interface_descriptor(),
usbd_languages_descriptor(),
usbd_parse_descriptors(),
usbd_string()
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