snprintf(dev_buf, sizeof(dev_buf), "%s/class/net/bonding_masters", sysfs_path);
snprintf(buf, sizeof(buf), "%c%s", op, ifname);
snprintf(dev_buf, sizeof(dev_buf), "%s/class/net/bonding_masters", sysfs_path);
snprintf(buf, sizeof(buf), "%c%s", op, ifname);