don't zero buffer when doing in/out ioctl's

copyin & copyout now return EFAULT and all callers uniformly
return (or ignore) this value

using return val from copyin/copyout -- causes uiomove to
give errno of -1 instead of EFAULT!!!

error uninitialized in uiomove

make mkdir & rmdir work with rdwri (still kludged)

u.u_pofile flags are now UF_*

include ioctl.h separate from tty.h

no return value and add read(..., 0) early return

merge of 4.1b and 4.1c; and missing check for 0 length write

lint

lint

more lint

more lint

ioctl lower levels return errno's

return errors from ioctl routines and internal ldisc routines

header files to vax directories

label_t now structure

cosmetic for new style limits

first completely uio'd version

no more readi()

read() now goes through readip()

fixes to get uio'd readi for char devs

first use of readip()

don't copy stuff out if an error in lower levels