最終更新:2017-06-13 (火) 16:23:06 (2499d)  

find_usbfs_path
Top / find_usbfs_path

処理

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コード 

  • static const char *find_usbfs_path(void)
{
	const char *path = "/dev/bus/usb";
	const char *ret = NULL;

	if (check_usb_vfs(path)) {
		ret = path;
	} else {
		path = "/proc/bus/usb";
		if (check_usb_vfs(path))
			ret = path;
	}

	/* look for /dev/usbdev*.* if the normal places fail */
	if (ret == NULL) {
		struct dirent *entry;
		DIR *dir;

		path = "/dev";
		dir = opendir(path);
		if (dir != NULL) {
			while ((entry = readdir(dir)) != NULL) {
				if (_is_usbdev_entry(entry, NULL, NULL)) {
					/* found one; that's enough */
					ret = path;
					usbdev_names = 1;
					break;
				}
			}
			closedir(dir);
		}
	}

/* On udev based systems without any usb-devices /dev/bus/usb will not
 * exist. So if we've not found anything and we're using udev for hotplug
 * simply assume /dev/bus/usb rather then making libusb_init fail. */
#if defined(USE_UDEV)
	if (ret == NULL)
		ret = "/dev/bus/usb";
#endif

	if (ret != NULL)
		usbi_dbg("found usbfs at %s", ret);

	return ret;
}



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