>
> Message: 9
> Date: Wed, 30 Oct 2019 01:46:54 -0000
> From: John Canada <1850570@bugs.launchpad.net>
> To: qemu-devel@nongnu.org
> Subject: [Bug 1850570] [NEW] Cannot use usb-host on Mac OS
> Message-ID:
>         <
> 157240001496.28481.10507378472210680134.malonedeb@chaenomeles.canonical.com
> >
>
> Content-Type: text/plain; charset="utf-8"
>
> Public bug reported:
>
> Usb-host will not work on Mac OS 10.15.  Qemu runs, though it gives
> these errors and the drive does not show up.  Also, when Qemu is
> starting the drive ejects and remounts twice. Qemu built with
> ./configure --target-list=i386-softmmu,x86_64-softmmu --enable-sdl
> --disable-cocoa --enable-sdl-image.
>
> qemu-system-i386 image.qcow -usb -device usb-kbd  -device
> usb-host,vendorid=0x0781,productid=0x5571
> libusb: error [darwin_claim_interface] USBInterfaceOpen: another process
> has device opened for exclusive access
> libusb: error [darwin_claim_interface] interface not found
> libusb: error [darwin_claim_interface] interface not found
> libusb: error [darwin_claim_interface] interface not found
> libusb: error [darwin_claim_interface] interface not found
> libusb: error [darwin_claim_interface] interface not found
> libusb: error [darwin_claim_interface] interface not found
> libusb: error [darwin_claim_interface] interface not found
> libusb: error [darwin_claim_interface] interface not found
> libusb: error [darwin_claim_interface] interface not found
> libusb: error [darwin_claim_interface] interface not found
> libusb: error [darwin_claim_interface] interface not found
> libusb: error [darwin_claim_interface] interface not found
> libusb: error [darwin_claim_interface] interface not found
> libusb: error [darwin_claim_interface] interface not found
> libusb: error [darwin_claim_interface] interface not found
> libusb: error [darwin_claim_interface] USBInterfaceOpen: another process
> has device opened for exclusive access
> libusb: error [darwin_claim_interface] interface not found
> libusb: error [darwin_claim_interface] interface not found
> libusb: error [darwin_claim_interface] interface not found
> libusb: error [darwin_claim_interface] interface not found
> libusb: error [darwin_claim_interface] interface not found
> libusb: error [darwin_claim_interface] interface not found
> libusb: error [darwin_claim_interface] interface not found
> libusb: error [darwin_claim_interface] interface not found
> libusb: error [darwin_claim_interface] interface not found
> libusb: error [darwin_claim_interface] interface not found
> libusb: error [darwin_claim_interface] interface not found
> libusb: error [darwin_claim_interface] interface not found
> libusb: error [darwin_claim_interface] interface not found
> libusb: error [darwin_claim_interface] interface not found
> libusb: error [darwin_claim_interface] interface not found
>
> ** Affects: qemu
>      Importance: Undecided
>          Status: New
>
> --
> You received this bug notification because you are a member of qemu-
> devel-ml, which is subscribed to QEMU.
> https://bugs.launchpad.net/bugs/1850570
>
> Title:
>   Cannot use usb-host on Mac OS
>
> Status in QEMU:
>   New
>
> Bug description:
>   Usb-host will not work on Mac OS 10.15.  Qemu runs, though it gives
>   these errors and the drive does not show up.  Also, when Qemu is
>   starting the drive ejects and remounts twice. Qemu built with
>   ./configure --target-list=i386-softmmu,x86_64-softmmu --enable-sdl
>   --disable-cocoa --enable-sdl-image.
>
>   qemu-system-i386 image.qcow -usb -device usb-kbd  -device
> usb-host,vendorid=0x0781,productid=0x5571
>   libusb: error [darwin_claim_interface] USBInterfaceOpen: another process
> has device opened for exclusive access
>   libusb: error [darwin_claim_interface] interface not found
>   libusb: error [darwin_claim_interface] interface not found
>   libusb: error [darwin_claim_interface] interface not found
>   libusb: error [darwin_claim_interface] interface not found
>   libusb: error [darwin_claim_interface] interface not found
>   libusb: error [darwin_claim_interface] interface not found
>   libusb: error [darwin_claim_interface] interface not found
>   libusb: error [darwin_claim_interface] interface not found
>   libusb: error [darwin_claim_interface] interface not found
>   libusb: error [darwin_claim_interface] interface not found
>   libusb: error [darwin_claim_interface] interface not found
>   libusb: error [darwin_claim_interface] interface not found
>   libusb: error [darwin_claim_interface] interface not found
>   libusb: error [darwin_claim_interface] interface not found
>   libusb: error [darwin_claim_interface] interface not found
>   libusb: error [darwin_claim_interface] USBInterfaceOpen: another process
> has device opened for exclusive access
>   libusb: error [darwin_claim_interface] interface not found
>   libusb: error [darwin_claim_interface] interface not found
>   libusb: error [darwin_claim_interface] interface not found
>   libusb: error [darwin_claim_interface] interface not found
>   libusb: error [darwin_claim_interface] interface not found
>   libusb: error [darwin_claim_interface] interface not found
>   libusb: error [darwin_claim_interface] interface not found
>   libusb: error [darwin_claim_interface] interface not found
>   libusb: error [darwin_claim_interface] interface not found
>   libusb: error [darwin_claim_interface] interface not found
>   libusb: error [darwin_claim_interface] interface not found
>   libusb: error [darwin_claim_interface] interface not found
>   libusb: error [darwin_claim_interface] interface not found
>   libusb: error [darwin_claim_interface] interface not found
>   libusb: error [darwin_claim_interface] interface not found
>
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/qemu/+bug/1850570/+subscriptions
>
>
>
Have you tried running QEMU under root yet? I had a similar issue with
accessing the optical drive on my computer until I ran QEMU like this:

sudo qemu-system-i386 ...