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/* openpty.h -- provides openpty() and login_tty()
*
* Copyright (C) 1996-2004 by Ian Piumarta and other authors/contributors
* listed elsewhere in this file.
* All rights reserved.
*
* This file is part of Unix Squeak.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
* Author: Ian.Piumarta@inria.fr
*
* Last edited: 2006-10-18 10:09:16 by piumarta on emilia.local
*/
#if defined(HAVE_OPENPTY)
# include <utmp.h> /* login_tty() */
# if defined(HAVE_PTY_H)
# include <pty.h> /* openpty() */
# elif defined(HAVE_UTIL_H)
# include <util.h> /* openpty() */
# elif defined(HAVE_LIBUTIL_H)
# include <libutil.h> /* openpty() on FreeBSD */
# else
# error: cannot find headers for openpty()
# endif
#else /* !HAVE_OPENPTY */
# if defined(HAVE_UNIX98_PTYS)
/* we'll just roll our own, it ain't hard */
# include <stdlib.h> /* ptsname(), grantpt(), unlockpt() */
# include <unistd.h>
# include <string.h>
# include <fcntl.h>
# if defined(HAVE_STROPTS_H)
# include <stropts.h>
# include <sys/ioctl.h>
# endif
static int openpty(int *ptmp, int *ptsp, char *ttyp, void *termiosp, void *winp)
{
int ptm= -1, pts= -1;
char *tty= 0;
if ((ptm= open("/dev/ptmx", O_RDWR, 0)) == -1) return -1;
tty= ptsname(ptm);
if (grantpt(ptm) == -1) return -1;
if (unlockpt(ptm) == -1) return -1;
if ((pts= open(tty, O_RDWR, 0)) == -1) return -1;
*ptmp= ptm;
*ptsp= pts;
strcpy(ttyp, tty);
return 0;
}
static int login_tty(int pts)
{
#if defined(HAVE_STROPTS_H)
/* push a terminal onto stream head */
if (ioctl(pts, I_PUSH, "ptem") == -1) return -1;
if (ioctl(pts, I_PUSH, "ldterm") == -1) return -1;
#endif
setsid();
#if defined(TIOCSCTTY)
ioctl(pts, TIOCSCTTY, 0);
#endif
dup2(pts, 0);
dup2(pts, 1);
dup2(pts, 2);
if (pts > 2) close(pts);
return 0;
}
# else /* !HAVE_UNIX98_PTYS */
# error: cannot open a pty -- this plugin will not work
# endif
#endif /* !HAVE_OPENPTY */
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