pwritev_args
{ .sy_narg = AS(pwritev_args), .sy_call = (sy_call_t *)sys_pwritev, .sy_auevent = AUE_PWRITEV, .sy_flags = SYF_CAPENABLED, .sy_thrcnt = SY_THR_STATIC }, /* 290 = pwritev */
sys_pwritev(struct thread *td, struct pwritev_args *uap)
struct pwritev_args *p = params;
int sys_pwritev(struct thread *, struct pwritev_args *);