/*
 * Copyright (c) 1995, 1996 Gunther Schadow.  All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 * 
 * This program 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 General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <unistd.h>
#include <errno.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/file.h>
#include <stdio.h>
#include <string.h>

int
main()
{
  int master, master2;
  int gotpty = 0;
  char *line;
  struct stat statbuf;
  char c;
  int i;
  
  /* search a free pty */
  
  for (c = 'p'; !gotpty && c <= 's'; c++)
    {
      line = strdup("/dev/ptyXX");
      line[sizeof("/dev/pty")-1] = c;
      line[sizeof("/dev/ptyp")-1] = '0';
      if (stat(line, &statbuf) < 0)
	break;
      for (i = 0; i < 16; i++)
	{
	  line[sizeof("/dev/ptyp")-1] = "0123456789abcdef"[i];
	  master = open(line, O_RDWR);
	  if (master > 0) 
	    {
	      gotpty = 1;
	      break;
	    }
	  else
	    perror(line);
	}
    }
  if (!gotpty)
    {
      fprintf(stderr, "all ptys in use");
      exit(1);
    }
  
  if((master2 = dup(master)) < 0)
    {
      perror("dup");
      exit(1);
    }

  close(master);

  if(open(line, O_RDWR) < 0)
    {
      int the_errno = errno;
      perror("multipy opening a pty master results in");
      printf("%d\n", the_errno);
      exit(0);
    }

  fprintf(stderr, "pty masters may be multiply opened\n");
  exit(2);
}