theo ok

suggested by deraadt@

ioctl(2), an unprivileged process may allocate a pty and have its owner
and mode set appropriately.  This means that programs such as xterm and
screen no longer need to be setuid.  Programs using the openpty()
function require zero changes and will "just work".
Designed by beck@ and deraadt@; changes by beck@ with cleanup (and
a rewrite of the vnode bits) by art@ and tweaks/bugfixes by me.
Tested by many.

The latest versions are at http://www.ata-atapi.com/hiw.htm.
Discussed with nick@ and jmc@.  ok deraadt@.

some of this ok espie@, all of it ok deraadt@

ok deraadt@

this can cause confusion when a user tries to use a long option with
a program that only supports short options.  Furthermore, it appears
to be in violation of POSIX, which states that "--" shall indicate
the end of argument processing, not any string that begins with "--".
OK otto@ and closes PR 3666.

STeve Andre

ok deraadt@

discussed with todd@

u_char -> unsigned char
u_short -> unsigned short
u_long -> unsigned long
u_int -> unsigned int
okay millert@