70 lines
1.9 KiB
C
70 lines
1.9 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <time.h>
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#include <libusb-1.0/libusb.h>
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static int count = 0;
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int hotplug_callback(struct libusb_context *ctx, struct libusb_device *dev,
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libusb_hotplug_event event, void *user_data) {
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static libusb_device_handle *dev_handle = NULL;
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struct libusb_device_descriptor desc;
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int rc;
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printf("Entering callback\n"); // DEBUG
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(void)libusb_get_device_descriptor(dev, &desc);
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printf("%04x:%04x (bus %d, device %d)\n",
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desc.idVendor, desc.idProduct,
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libusb_get_bus_number(dev), libusb_get_device_address(dev));
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if (LIBUSB_HOTPLUG_EVENT_DEVICE_ARRIVED == event) {
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rc = libusb_open(dev, &dev_handle);
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if (LIBUSB_SUCCESS != rc) {
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printf("Could not open USB device\n");
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}
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} else if (LIBUSB_HOTPLUG_EVENT_DEVICE_LEFT == event) {
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if (dev_handle) {
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libusb_close(dev_handle);
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dev_handle = NULL;
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}
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} else {
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printf("Unhandled event %d\n", event);
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}
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count++;
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return 0;
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}
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int main (void) {
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libusb_hotplug_callback_handle callback_handle;
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int rc;
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libusb_init(NULL);
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rc = libusb_hotplug_register_callback(
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NULL,
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LIBUSB_HOTPLUG_EVENT_DEVICE_ARRIVED | LIBUSB_HOTPLUG_EVENT_DEVICE_LEFT,
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0,
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LIBUSB_HOTPLUG_MATCH_ANY,
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LIBUSB_HOTPLUG_MATCH_ANY,
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LIBUSB_HOTPLUG_MATCH_ANY,
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hotplug_callback,
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NULL,
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&callback_handle);
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if (LIBUSB_SUCCESS != rc) {
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printf("Error creating a hotplug callback\n");
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libusb_exit(NULL);
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return EXIT_FAILURE;
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}
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while (count < 2) {
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libusb_handle_events_completed(NULL, NULL);
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nanosleep(&(struct timespec){0, 10000000UL}, NULL);
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}
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libusb_hotplug_deregister_callback(NULL, callback_handle);
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libusb_exit(NULL);
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return 0;
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}
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