On Fri, Apr 03, 2020 at 07:05:13AM +0000, bauerchen(陈蒙蒙) wrote: > thanks, but my libusbx version is libusbx-1.0.15-4.el7.x86_64 , > I can find libusb_get_port_numbers function in libusb-1.0.so.0 but find > libusb_get_port_number > > [root@t]# strings /lib64/libusb-1.0.so.0 |grep libusb_get_port_number > libusb_get_port_number > [root@t]#
kraxel@sirius ~# grep libusb_get_port_number /usr/include/libusb-1.0/libusb.h uint8_t LIBUSB_CALL libusb_get_port_number(libusb_device *dev); int LIBUSB_CALL libusb_get_port_numbers(libusb_device *dev, uint8_t* port_numbers, int port_numbers_len); LIBUSB_DEPRECATED_FOR(libusb_get_port_numbers) So libusb_get_port_numbers replaces libusb_get_port_number, seems you have an old version which hasn't yet libusb_get_port_numbers. On old version qemu should fallback to libusb_get_port_path, but maybe the version #ifdef is wrong so this doesn't work properly for some versions ... According to my /usr/include/libusb-1.0/libusb.h libusb >= 1.0.16 declares LIBUSB_API_VERSION >= 0x01000102, so that looks ok. Hmm, not sure what is going on here. In any case the libusb_get_port_path fallback code path should work. cheers, Gerd
