/*-

 * Copyright (c) 1990, 1993

 *	The Regents of the University of California.  All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 * 4. Neither the name of the University nor the names of its contributors

 *    may be used to endorse or promote products derived from this software

 *    without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND

 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE

 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY

 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

 * SUCH DAMAGE.

 */

#if defined(LIBC_SCCS) && !defined(lint)

static char sccsid[] = "@(#)login_tty.c	8.1 (Berkeley) 6/4/93";

#endif /* LIBC_SCCS and not lint */

#include <errno.h>

#include <sys/param.h>

#include <sys/ioctl.h>

#include <unistd.h>

#include <fcntl.h>

#include <utmp.h>

int

login_tty (int fd)

{

	(void) setsid();

#ifdef TIOCSCTTY

	if (ioctl(fd, TIOCSCTTY, (char *)NULL) == -1)

		return (-1);

#else

	{

	  /* This might work.  */

	  char *fdname = ttyname (fd);

	  int newfd;

	  if (fdname)

	    {

	      if (fd != 0)

		(void) close (0);

	      if (fd != 1)

		(void) close (1);

	      if (fd != 2)

		(void) close (2);

	      newfd = open (fdname, O_RDWR);

	      (void) close (newfd);

	    }

	}

#endif

	while (dup2(fd, 0) == -1 && errno == EBUSY)

	  ;

	while (dup2(fd, 1) == -1 && errno == EBUSY)

	  ;

	while (dup2(fd, 2) == -1 && errno == EBUSY)

	  ;

	if (fd > 2)

		(void) close(fd);

	return (0);

}

libutil_hidden_def (login_tty)