/** * udev_device_new_from_device_id: * @udev: udev library context * @id: text string identifying a kernel device * * Create new udev device, and fill in information from the sys * device and the udev database entry. The device is looked-up * by a special string: * b8:2 - block device major:minor * c128:1 - char device major:minor * n3 - network device ifindex * +sound:card29 - kernel driver core subsystem:device name * * The initial refcount is 1, and needs to be decremented to * release the resources of the udev device. * * Returns: a new udev device, or #NULL, if it does not exist **/ _public_ struct udev_device *udev_device_new_from_device_id(struct udev *udev, const char *id) { struct udev_device *udev_device; int r; udev_device = udev_device_new(udev); if (!udev_device) return NULL; r = sd_device_new_from_device_id(&udev_device->device, id); if (r < 0) { errno = -r; udev_device_unref(udev_device); return NULL; } return udev_device; }
static int list_links(int argc, char *argv[], void *userdata) { _cleanup_netlink_message_unref_ sd_netlink_message *req = NULL, *reply = NULL; _cleanup_netlink_unref_ sd_netlink *rtnl = NULL; _cleanup_free_ LinkInfo *links = NULL; int r, c, i; pager_open_if_enabled(); r = sd_netlink_open(&rtnl); if (r < 0) return log_error_errno(r, "Failed to connect to netlink: %m"); r = sd_rtnl_message_new_link(rtnl, &req, RTM_GETLINK, 0); if (r < 0) return rtnl_log_create_error(r); r = sd_netlink_message_request_dump(req, true); if (r < 0) return rtnl_log_create_error(r); r = sd_netlink_call(rtnl, req, 0, &reply); if (r < 0) return log_error_errno(r, "Failed to enumerate links: %m"); if (arg_legend) printf("%3s %-16s %-18s %-11s %-10s\n", "IDX", "LINK", "TYPE", "OPERATIONAL", "SETUP"); c = decode_and_sort_links(reply, &links); if (c < 0) return rtnl_log_parse_error(c); for (i = 0; i < c; i++) { _cleanup_free_ char *setup_state = NULL, *operational_state = NULL; _cleanup_device_unref_ sd_device *d = NULL; const char *on_color_operational, *off_color_operational, *on_color_setup, *off_color_setup; char devid[2 + DECIMAL_STR_MAX(int)]; _cleanup_free_ char *t = NULL; sd_network_link_get_operational_state(links[i].ifindex, &operational_state); operational_state_to_color(operational_state, &on_color_operational, &off_color_operational); sd_network_link_get_setup_state(links[i].ifindex, &setup_state); setup_state_to_color(setup_state, &on_color_setup, &off_color_setup); sprintf(devid, "n%i", links[i].ifindex); (void)sd_device_new_from_device_id(&d, devid); link_get_type_string(links[i].iftype, d, &t); printf("%3i %-16s %-18s %s%-11s%s %s%-10s%s\n", links[i].ifindex, links[i].name, strna(t), on_color_operational, strna(operational_state), off_color_operational, on_color_setup, strna(setup_state), off_color_setup); } if (arg_legend) printf("\n%i links listed.\n", c); return 0; }
/* 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; }