window/wwpty.c

   1 /*      $NetBSD: wwpty.c,v 1.5 1997/11/21 08:49:12 mrg Exp $    */
   2
   3 /*
   4  * Copyright (c) 1983, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * This code is derived from software contributed to Berkeley by
   8  * Edward Wang at The University of California, Berkeley.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  * 3. All advertising materials mentioning features or use of this software
  19  *    must display the following acknowledgement:
  20  *      This product includes software developed by the University of
  21  *      California, Berkeley and its contributors.
  22  * 4. Neither the name of the University nor the names of its contributors
  23  *    may be used to endorse or promote products derived from this software
  24  *    without specific prior written permission.
  25  *
  26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  36  * SUCH DAMAGE.
  37  */
  38
  39 #include <sys/cdefs.h>
  40 #ifndef lint
  41 #if 0
  42 static char sccsid[] = "@(#)wwpty.c     8.1 (Berkeley) 6/6/93";
  43 #else
  44 __RCSID("$NetBSD: wwpty.c,v 1.5 1997/11/21 08:49:12 mrg Exp $");
  45 #endif
  46 #endif /* not lint */
  47
  48 #if !defined(OLD_TTY) && !defined(TIOCPKT)
  49 #include <sys/ioctl.h>
  50 #endif
  51 #include <fcntl.h>
  52 #include <string.h>
  53 #include <unistd.h>
  54 #include "ww.h"
  55
  56 int
  57 wwgetpty(w)
  58         struct ww *w;
  59 {
  60         char c, *p;
  61         int tty;
  62         int on = 1;
  63 #define PTY "/dev/XtyXX"
  64 #define _PT     5
  65 #define _PQRS   8
  66 #define _0_9    9
  67
  68         (void) strcpy(w->ww_ttyname, PTY);
  69         for (c = 'p'; c <= 'u'; c++) {
  70                 w->ww_ttyname[_PT] = 'p';
  71                 w->ww_ttyname[_PQRS] = c;
  72                 w->ww_ttyname[_0_9] = '0';
  73                 if (access(w->ww_ttyname, 0) < 0)
  74                         break;
  75                 for (p = "0123456789abcdef"; *p; p++) {
  76                         w->ww_ttyname[_PT] = 'p';
  77                         w->ww_ttyname[_0_9] = *p;
  78                         if ((w->ww_pty = open(w->ww_ttyname, 2)) < 0)
  79                                 continue;
  80                         w->ww_ttyname[_PT] = 't';
  81                         if ((tty = open(w->ww_ttyname, 2)) < 0) {
  82                                 (void) close(w->ww_pty);
  83                                 continue;
  84                         }
  85                         (void) close(tty);
  86                         if (ioctl(w->ww_pty, TIOCPKT, (char *)&on) < 0) {
  87                                 (void) close(w->ww_pty);
  88                                 continue;
  89                         }
  90                         (void) fcntl(w->ww_pty, F_SETFD, 1);
  91                         return 0;
  92                 }
  93         }
  94         w->ww_pty = -1;
  95         wwerrno = WWE_NOPTY;
  96         return -1;
  97 }