diff options
Diffstat (limited to 'libusb/io.c')
| -rw-r--r-- | libusb/io.c | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/libusb/io.c b/libusb/io.c index 203fd47..2f38d67 100644 --- a/libusb/io.c +++ b/libusb/io.c @@ -3,8 +3,8 @@ * I/O functions for libusb * Copyright © 2007-2009 Daniel Drake <dsd@gentoo.org> * Copyright © 2001 Johannes Erdfelt <johannes@erdfelt.com> - * Copyright © 2019 Nathan Hjelm <hjelmn@cs.umm.edu> - * Copyright © 2019 Google LLC. All rights reserved. + * Copyright © 2019-2022 Nathan Hjelm <hjelmn@cs.unm.edu> + * Copyright © 2019-2022 Google LLC. All rights reserved. * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public @@ -311,7 +311,11 @@ if (r == 0 && actual_length == sizeof(data)) { * libusb_cancel_transfer() is asynchronous/non-blocking in itself. When the * cancellation actually completes, the transfer's callback function will * be invoked, and the callback function should check the transfer status to - * determine that it was cancelled. + * determine that it was cancelled. On macOS and iOS it is not possible to + * cancel a single transfer. In this case cancelling one tranfer on an endpoint + * will cause all transfers on that endpoint to be cancelled. In some cases + * the call may cause the endpoint to stall. A call to \ref libusb_clear_halt + * may be needed. * * Freeing the transfer after it has been cancelled but before cancellation * has completed will result in undefined behaviour. |