Corpus for sendmmsg:

Coverage	Program
551	socket$nl_xfrm-getsockopt$sock_cred-setuid-socket$netlink-sendmmsg
546	socket$packet-sendmmsg
543	socket$netlink-sendmmsg
529	socket$netlink-sendmmsg
450	syz_init_net_socket$bt_l2cap-connect$bt_l2cap-sendmmsg
392	socketpair$unix-sendmmsg