Belkin F8E211 Guida Utente Scaricare il pdf (Pagina 60)

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usbd

free

Free the USB Request Block allocated by usbd

alloc

urb()

Synopsis:

#include <sys/usbdi.h>

struct usbd_urb *usbd_free_urb( struct usbd_urb *urb );

Arguments:

urb A pointer to the URB to be freed.

Library:

libusbdi

Description:

The usbd

free

urb() function frees the memory allocated by usbd

alloc

urb().

Returns:

EOK Success.

Classiﬁcation:

QNX Neutrino, QNX 4

Safety

Cancellation point No

Interrupt handler No

Signal handler No

Thread Yes

See also:

usbd

alloc(), usbd

alloc

urb(), usbd

free(), usbd

mphys()

46 Chapter 4 • USB Library Reference September 10, 2007

1 2 ... 55 56 57 58 59 60 61 62 63 64 65 ... 106 107

Momentics 1
Publishing history 2
Contents 3
Contents September 10, 2007 4
Index 89 5
About the USB DDK 7
What you’ll ﬁnd in this guide 9
Assumptions 9
# mkdir my_DDK 10
# cd my_DDK 10
Building DDKs 11
Typographical conventions 12
Technical support 13
Chapter 1 15
Before You Begin 15
In this chapter. . 15
System requirements 17
USB devices supported 17
Known limitations 17
Photon and text mode 18
Chapter 2 19
Overview 19
The USB stack and library 21
How a class driver works 22
Chapter 3 23
USB Utilities 23
Chapter 4 27
USB Library Reference 27
Connection functions 29
Memory-management functions 29
I/O functions 29
Pipe-management functions 30
Abort all requests on a pipe 32
#include <sys/usbdi.h> 33
Examples: 44
Caveats: 45
Detach from the USB device 48
_int32 *fnum 61
_int32 *ﬂen ); 61
*usbd_languages_descriptor( 70
Reset a USB device 79
_uint8 cfg ); 81
_uint8 ifc 82
_uint8 alt ); 82
_uint32 ﬂags 84
_uint32 len ); 84
EOK Success 87
Get speciﬁc device status 94
Get a string descriptor 96
Synopsis: 100
Arguments: 100
Library: 100
Description: 100
Returns: 101
See also: 102
Classiﬁcation: 102
_USBDI_NFUNCS 29 103
90 Index September 10, 2007 104
URB_DIR_IN 70, 72, 74, 76, 78 105
URB_ISOCH_ASAP 76 105
92 Index September 10, 2007 106
USBD_TIME_DEFAULT 54 107
USBD_TIME_INFINITY 54 107
USBD_VERSION 28 107

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Belkin F8E211 Guida Utente Pagina 60

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