Make the termp and winp arguments for openpty, et al. const.
This matches the prototypes in glibc and musl libc.
From Matthew Martin. OK tb@

add previous to NAME;

Add getptmfd(), fdopenpty(), fdforkpty() functions. These allow programs
to separate the open(/dev/ptm) from the ioctl(PTMGET) for privilege
separation or pledge().

Based on a diff from reyk@.

ok d

Add getptmfd(), fdopenpty(), fdforkpty() functions. These allow programs
to separate the open(/dev/ptm) from the ioctl(PTMGET) for privilege
separation or pledge().

Based on a diff from reyk@.

ok deraadt millert

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Remove lies about openpty(4) searching for a free pseudo-tty by iterating
through all existing pseudo-tty devices in /dev.

use fancy .In macro for includes. from Jan Klemkow. ok jmc schwarze

convert to new .Dd format;

update FILES;

fixes pr #3998; diff from frank denis, though slightly different fix
committed;
help and ok millert@

typo

Add the ptm device to pty(4). By opening /dev/ptm and using the PTMGET
ioctl(2), an unprivileged process may allocate a pty and have its owner
and mode set appropriately. This means that programs s

Add the ptm device to pty(4). By opening /dev/ptm and using the PTMGET
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.

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Remove the advertising clause in the UCB license which Berkeley
rescinded 22 July 1999. Proofed by myself and Theo.

- section reorder
- clean up .Xr's

- typos
- new sentence, new line

o) start new sentence on a new line;
o) always close .Bl tags;
o) fix usage of .Xr;

millert@ ok

Make the list of required #includes match reality.

say how long the buffer needs to be

Remove a lie. We don't skip /dev/ttyv* since our pcvt uses /dev/ttyC*.

when using `-' as a negative sign, escape it with a backslash so troff knows
it's not supposed to be a hyphen/dash

Update from NetBSD.
- correct two .Fn references to forkpty()
- describe retval of forkpty(); it can return PID as well
- add xref to fork(2)

openpty() returns int.

libutil