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