__siov           1309 sprintf.c          struct __siov *iov;
__siov            229 vsnprintf.c    	struct	__siov *uio_iov;
__siov            245 vsnprintf.c    	register struct __siov *iov;
__siov            543 vsnprintf.c    	register struct __siov *iovp;/* for PRINT macro */
__siov            570 vsnprintf.c    	struct __siov iov[NIOV];/* ... and individual io vectors */