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/* Copyright (C) 1998, 1999, 2004 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Zack Weinberg <zack@rabi.phys.columbia.edu>, 1998.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, write to the Free
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   02111-1307 USA.  */

#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <stdlib.h>
#include <string.h>
#include <termios.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/ioctl.h>

#define _PATH_DEVPTMX "/dev/ptmx"

int openpty (int *amaster, int *aslave, char *name, struct termios *termp,
                struct winsize *winp)
{
        char buf[PATH_MAX];
        int master, slave;

        master = open(_PATH_DEVPTMX, O_RDWR);
        if (master == -1)
                return -1;

        if (grantpt(master))
                goto fail;

        if (unlockpt(master))
                goto fail;

        if (ptsname_r(master, buf, sizeof buf))
                goto fail;

        slave = open(buf, O_RDWR | O_NOCTTY);
        if (slave == -1)
                goto fail;

        /* XXX Should we ignore errors here?  */
        if (termp)
                tcsetattr(slave, TCSAFLUSH, termp);
        if (winp)
                ioctl(slave, TIOCSWINSZ, winp);

        *amaster = master;
        *aslave = slave;
        if (name != NULL)
                strcpy(name, buf);

        return 0;

fail:
        close(master);
        return -1;
}