text: /* $OpenBSD$ */
  
  /*
   * Copyright (c) 2017 Nicholas Marriott <nicholas.marriott@gmail.com>
   *
   * Permission to use, copy, modify, and distribute this software for any
   * purpose with or without fee is hereby granted, provided that the above
   * copyright notice and this permission notice appear in all copies.
   *
   * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
   * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
   * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
   * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
   * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
   * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
   */
  
  #include <sys/types.h>
  #include <sys/ioctl.h>
  #include <sys/time.h>
  #ifdef __OpenBSD__
  #include <sys/tty.h>
  #endif
  
  #include <fcntl.h>
  #include <string.h>
  #include <termios.h>
  #include <unistd.h>
  
  #include "compat.h"
  
  int	pty_open(int *);
  pid_t	pty_fork(int, int *, char *, size_t, struct winsize *);
  
  #ifdef __OpenBSD__
  int
  pty_open(int *fd)
  {
  	*fd = open(PATH_PTMDEV, O_RDWR|O_CLOEXEC);
  	if (*fd < 0)
  	    return (-1);
  	return (0);
  }
  #else
  int
  pty_open(__unused int *fd)
  {
  	*fd = -1;
  	return (0);
  }
  #endif
  
  #ifdef __OpenBSD__
  pid_t
  pty_fork(int ptmfd, int *fd, char *name, size_t namelen, struct winsize *ws)
  {
  	struct ptmget	ptm;
  	pid_t		pid;
  
  	if (ioctl(ptmfd, PTMGET, &ptm) == -1)
  		return (-1);
  
  	strlcpy(name, ptm.sn, namelen);
  	ioctl(ptm.sfd, TIOCSWINSZ, ws);
  
  	switch (pid = fork()) {
  	case -1:
  		close(ptm.cfd);
  		close(ptm.sfd);
  		return (-1);
  	case 0:
  		close(ptm.cfd);
  		login_tty(ptm.sfd);
  		return (0);
  	}
  	*fd = ptm.cfd;
  	close(ptm.sfd);
  	return (pid);
  }
  #else
  pid_t
  pty_fork(__unused int ptmfd, int *fd, char *name, __unused size_t namelen,
      struct winsize *ws)
  {
  	return (forkpty(fd, name, NULL, ws));
  }
  #endif
  