Feedback for portable libusb code

[Romain Tartière]

Hello!

FreeBSD's libusb allows userland programs to access USB devices in a way
similar to GNU/Linux with it's libusb.

However, there are some differences between these implementations.  I
recently diagnosed an issue in sigrok, provided a patch, but the
maintainer is having some questions and I am not sure about the best way
to address them.

If someone with more USB insight could give a look to this GitHub issue,
that would be awesome !

Basically, the usb_get_port_path() calls libusb_open() before (and
libusb_close() after) libusb_get_port_numbers() because this is required
on FreeBSD:
https://github.com/sigrokproject/libsigrok/blob/a9010323ddf4e479663e871386c05db05ea3522e/src/usb.c#L478-L491

However, calling libusb_open() twice fails…

The issue is here:
https://github.com/sigrokproject/libsigrok/pull/6

Thanks!

Romain

-- 
Romain Tartière <romain at FreeBSD.org>  http://people.FreeBSD.org/~romain/
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