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Update a comment to reflect recent changes and to reflect behavior of 

later Linux kernels.

svn path=/trunk/; revision=32535
This commit is contained in:
Guy Harris 2010-04-22 00:10:17 +00:00
parent 21a210b777
commit c6e453d090
1 changed files with 17 additions and 3 deletions
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20
wiretap/wtap.h
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@ -643,14 +643,28 @@ struct usb_device_setup_hdr {
guint16 wLength;
};
/*
* Information from the URB for Isochronous transfers.
*/
struct iso_rec {
guint32 error_count;
guint32 numdesc;
};
/*
* Header prepended by Linux kernel to each USB event.
* Always followed by a struct usb_device_setup_hdr, although that header
* is valid only if setup_flag is 0; otherwise it's 8 bytes of junk.
* Always followed either by:
*
* a struct usb_device_setup_hdr, if "setup_flag" is 0;
*
* a struct iso_rec, if this is an isochronous transfer;
*
* 8 bytes of junk, otherwise.
*
* (Setup flag is '-', 'D', 'Z', or 0. Data flag is '<', '>', 'Z', or 0.)
* See linux/Documentation/usb/usbmon.txt and libpcap/pcap/usb.h for details.
*
* We present this as a pseudo-header; the values are in host byte order.
* The values are in *host* byte order.
*/
struct linux_usb_phdr {
guint64 id; /* urb id, to link submission and completion events */