sys_writev
{ .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 */
int sys_writev(struct thread *, struct writev_args *);