sd_dhcp_client_set_index  608 src/network/networkd-dhcp4.c         r = sd_dhcp_client_set_index(link->dhcp_client, link->ifindex);
sd_dhcp_client_set_index   51 src/systemd/sd-dhcp-client.h int sd_dhcp_client_set_index(sd_dhcp_client *client, int interface_index);