int uio_resid;
enum uio_seg uio_segflg;
enum uio_rw uio_rw;
struct proc *uio_procp;
struct thread *uio_td;
};
.Ed
.Ft int
.Dv UIO_READ ,
or
.Dv UIO_WRITE .
.It Dv uio_procp
.It Dv uio_td
The pointer to a
.Li struct proc
.Li struct thread
for the associated process; used if
for the associated thread; used if
.Dv uio_segflg
indicates that the transfer is to be made from/to a process's address
space.