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register cleanup for pty earlier. move code for pty-owner handling to pty.c
ok provos@, dugsong@

/*
 * 
 * pty.h
 * 
 * Author: Tatu Ylonen <ylo@cs.hut.fi>
 * 
 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
 *                    All rights reserved
 * 
 * Created: Fri Mar 17 05:03:28 1995 ylo
 * 
 * Functions for allocating a pseudo-terminal and making it the controlling
 * tty.
 */

/* RCSID("$Id: pty.h,v 1.5 2000/02/15 16:52:58 markus Exp $"); */

#ifndef PTY_H
#define PTY_H

/*
 * Allocates and opens a pty.  Returns 0 if no pty could be allocated, or
 * nonzero if a pty was successfully allocated.  On success, open file
 * descriptors for the pty and tty sides and the name of the tty side are
 * returned (the buffer must be able to hold at least 64 characters).
 */
int     pty_allocate(int *ptyfd, int *ttyfd, char *ttyname, int ttynamelen);

/*
 * Releases the tty.  Its ownership is returned to root, and permissions to
 * 0666.
 */
void    pty_release(const char *ttyname);

/*
 * Makes the tty the processes controlling tty and sets it to sane modes.
 * This may need to reopen the tty to get rid of possible eavesdroppers.
 */
void    pty_make_controlling_tty(int *ttyfd, const char *ttyname);

/* Changes the window size associated with the pty. */
void 
pty_change_window_size(int ptyfd, int row, int col,
    int xpixel, int ypixel);

void	pty_setowner(struct passwd *pw, const char *ttyname);

#endif				/* PTY_H */