[BRLTTY] brltty and libusb-compat

[William Hubbs]

Hi Dave,

On Sat, May 16, 2009 at 11:02:44PM -0400, Dave Mielke wrote:
> Can you point me to documentation which gives the details for what will/may no 
> longer work?
> 
> Do you know if they provide a compile-time way (ifdef?) to determine which 
> version of libusb is being used?


The README is very small, so I am attaching it below.

Let me know what you think.

Thanks,

William

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libusb-compat-0.1
=================

A compatibility layer allowing applications written for libusb-0.1 to work
with libusb-1.0. libusb-compat-0.1 attempts to look, feel, smell and walk
like libusb-0.1.

Do not attempt to install libusb-0.1 and libusb-compat-0.1 on the same system.

Known quirks/differences from libusb-0.1:
 1. usb_resetep(), a previously deprecated function, is implemented as
    equivalent to calling usb_clear_halt().
 2. libusb-0.1 allowed you to open a device which you did not have permission
    to do anything useful with (all I/O requests would immediately fail).
    libusb-compat-0.1 does not allow you to open such devices. You can still
    read descriptor info without opening a device.
 3. usb_device's "num_children" attribute is hardcoded to 0, and "children"
    is hardcoded to NULL. Do you need this information in your software? Let
    us know on the mailing list, and we'll add it.
 4. Some libusb-0.1 users may have implemented I/O cancellation by running
    transfers in their own threads and simply killing the thread when they
    don't want to do the transfer any more. This is bad programming practice
    for obvious reasons, and this lack of functionality was one of the primary
    drivers for libusb-1.0 development. With libusb-1.0 or libusb-compat-0.1
    backed by libusb-1.0, forcefully killing threads in this way is likely
    to cause all libusb I/O to halt. Instead, port your application to use
    libusb-1.0's asynchronous transfer API, which supports transfer
    cancellation.

libusb homepage:
http://libusb.sourceforge.net

Use the mailing list for questions, comments, etc:
https://sourceforge.net/mailarchive/forum.php?forum_name=libusb-devel

- Daniel Drake <dsd at gentoo.org>
(use the mailing list rather than mailing developers directly)

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