PERFORCE change 165991 for review

[Hans Petter Selasky]

http://perforce.freebsd.org/chv.cgi?CH=165991

Change 165991 by hselasky at hselasky_laptop001 on 2009/07/13 09:18:29

	
	LibUSB:
	 - add more documentation to manual page

Affected files ...

.. //depot/projects/usb/src/lib/libusb/libusb20.3#3 edit

Differences ...

==== //depot/projects/usb/src/lib/libusb/libusb20.3#3 (text+ko) ====

@@ -310,8 +310,13 @@
 .Pp
 .
 .Fn libusb20_tr_get_max_total_length
-function will return the maximum value for the length sum of all
-USB frames associated with an USB transfer.
+function will return the maximum value for the data length sum of all USB
+frames associated with an USB transfer.
+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.
 .
 .Pp
 .