Benno's Misadventures in libusb

gistfile1.txt

$ uname -a
Darwin benno-mac.local 17.7.0 Darwin Kernel Version 17.7.0: Thu Jun 21 22:53:14 PDT 2018; root:xnu-4570.71.2~1/RELEASE_X86_64 x86_64$ cc -o thing -I/usr/local/include/libusb-1.0 -L/usr/local/lib thing.c -lusb-1.0
$ ./thing
thing: set config failed: No such device (it may have been disconnected): No such file or directory
thing: claim interface failed: Access denied (insufficient permissions)

thing.c

#include <err.h>
#include <stdio.h>

#include <libusb.h>

int
main(void)
{
    libusb_context *ctx;
    libusb_device_handle *handle;
    libusb_device *device;
    struct libusb_device_descriptor desc;
    int err;

    if (libusb_init(&ctx) != 0) {
        errx(1, "failed to init");
    }

    handle = libusb_open_device_with_vid_pid(NULL, 0x1050, 0x0406);
    if (handle == NULL) {
        errx(1, "open failed");
    }

    device = libusb_get_device(handle);
    libusb_get_device_descriptor(device, &desc);

    if ((err = libusb_set_configuration(handle, 1)) != 0) {
        warn("set config failed: %s", libusb_strerror(err));
    }

    if ((err = libusb_claim_interface(handle, 1)) != 0) {
        errx(1, "claim interface failed: %s", libusb_strerror(err));
    }

    libusb_exit(ctx);
}