writev_args
{ .sy_narg = AS(writev_args), .sy_call = (sy_call_t *)sys_writev, .sy_auevent = AUE_WRITEV, .sy_flags = SYF_CAPENABLED, .sy_thrcnt = SY_THR_STATIC }, /* 121 = writev */
sys_writev(struct thread *td, struct writev_args *uap)
struct writev_args *p = params;
int sys_writev(struct thread *, struct writev_args *);