int udev_device_get_devlink_priority(struct udev_device *udev_device) {
int priority, r;
assert(udev_device);
r = device_get_devlink_priority(udev_device->device, &priority);
if (r < 0)
return r;
return priority;
}
/* find device node of device with highest priority */
static int link_find_prioritized(sd_device *dev, bool add, const char *stackdir, char **ret) {
_cleanup_closedir_ DIR *dir = NULL;
_cleanup_free_ char *target = NULL;
struct dirent *dent;
int r, priority = 0;
assert(!add || dev);
assert(stackdir);
assert(ret);
if (add) {
const char *devnode;
r = device_get_devlink_priority(dev, &priority);
if (r < 0)
return r;
r = sd_device_get_devname(dev, &devnode);
if (r < 0)
return r;
target = strdup(devnode);
if (!target)
return -ENOMEM;
}
dir = opendir(stackdir);
if (!dir) {
if (target) {
*ret = TAKE_PTR(target);
return 0;
}
return -errno;
}
FOREACH_DIRENT_ALL(dent, dir, break) {
_cleanup_(sd_device_unrefp) sd_device *dev_db = NULL;
const char *devnode, *id_filename;
int db_prio = 0;
if (dent->d_name[0] == '\0')
break;
if (dent->d_name[0] == '.')
continue;
log_device_debug(dev, "Found '%s' claiming '%s'", dent->d_name, stackdir);
if (device_get_id_filename(dev, &id_filename) < 0)
continue;
/* did we find ourself? */
if (streq(dent->d_name, id_filename))
continue;
if (sd_device_new_from_device_id(&dev_db, dent->d_name) < 0)
continue;
if (sd_device_get_devname(dev_db, &devnode) < 0)
continue;
if (device_get_devlink_priority(dev_db, &db_prio) < 0)
continue;
if (target && db_prio <= priority)
continue;
log_device_debug(dev_db, "Device claims priority %i for '%s'", db_prio, stackdir);
r = free_and_strdup(&target, devnode);
if (r < 0)
return r;
priority = db_prio;
}
if (!target)
return -ENOENT;
*ret = TAKE_PTR(target);
return 0;
}
