linux usb 监视

#include <libusb-1.0/libusb.h>
#include <stdio.h>
#include <stdlib.h>

void print_devs(libusb_device **devs) {
    libusb_device *dev;
    int i = 0, j = 0;
    uint8_t path[8]; 

    while ((dev = devs[i++]) != NULL) {
        struct libusb_device_descriptor desc;
        int r = libusb_get_device_descriptor(dev, &desc);
        if (r < 0) {
            fprintf(stderr, "Failed to get device descriptor\n");
            return;
        }

        printf("Bus %03d Device %03d: ID %04x:%04x\n",
               libusb_get_bus_number(dev),
               libusb_get_device_address(dev),
               desc.idVendor, desc.idProduct);
    }
}

int main(void) {
    libusb_context *context = NULL;
    libusb_device **devs;
    ssize_t cnt;

    r = libusb_init(&context);
    if (r < 0) {
        fprintf(stderr, "Init Error %d\n", r);
        return EXIT_FAILURE;
    }

    cnt = libusb_get_device_list(context, &devs);
    if (cnt < 0){
        fprintf(stderr, "Get Device Error\n");
        return EXIT_FAILURE;
    }

    print_devs(devs);
    libusb_free_device_list(devs, 1);

    libusb_exit(context);
    return EXIT_SUCCESS;
}