sendmsg_args
{ .sy_narg = AS(sendmsg_args), .sy_call = (sy_call_t *)sys_sendmsg, .sy_auevent = AUE_SENDMSG, .sy_flags = SYF_CAPENABLED, .sy_thrcnt = SY_THR_STATIC }, /* 28 = sendmsg */
struct sendmsg_args *p = params;
sys_sendmsg(struct thread *td, struct sendmsg_args *uap)
int sys_sendmsg(struct thread *, struct sendmsg_args *);