usr.bin/window/wwpty.c

   1 /*
   2  * Copyright (c) 1983, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * This code is derived from software contributed to Berkeley by
   6  * Edward Wang at The University of California, Berkeley.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. All advertising materials mentioning features or use of this software
  17  *    must display the following acknowledgement:
  18  *      This product includes software developed by the University of
  19  *      California, Berkeley and its contributors.
  20  * 4. Neither the name of the University nor the names of its contributors
  21  *    may be used to endorse or promote products derived from this software
  22  *    without specific prior written permission.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  34  * SUCH DAMAGE.
  35  *
  36  * @(#)wwpty.c  8.1 (Berkeley) 6/6/93
  37  * $FreeBSD: src/usr.bin/window/wwpty.c,v 1.2.2.1 2001/05/17 09:45:01 obrien Exp $
  38  * $DragonFly: src/usr.bin/window/wwpty.c,v 1.2 2003/06/17 04:29:34 dillon Exp $
  39  */
  40
  41 #include <fcntl.h>
  42 #include <string.h>
  43
  44 #include "ww.h"
  45
  46 #if !defined(OLD_TTY) && !defined(TIOCPKT)
  47 #include <sys/ioctl.h>
  48 #endif
  49
  50 wwgetpty(w)
  51 register struct ww *w;
  52 {
  53         register char c, *p;
  54         int tty;
  55         int on = 1;
  56 #define PTY "/dev/XtyXX"
  57 #define _PT     5
  58 #define _PQRS   8
  59 #define _0_9    9
  60
  61         (void) strcpy(w->ww_ttyname, PTY);
  62         for (c = 'p'; c <= 'u'; c++) {
  63                 w->ww_ttyname[_PT] = 'p';
  64                 w->ww_ttyname[_PQRS] = c;
  65                 w->ww_ttyname[_0_9] = '0';
  66                 if (access(w->ww_ttyname, 0) < 0)
  67                         break;
  68                 for (p = "0123456789abcdefghijklmnopqrstuv"; *p; p++) {
  69                         w->ww_ttyname[_PT] = 'p';
  70                         w->ww_ttyname[_0_9] = *p;
  71                         if ((w->ww_pty = open(w->ww_ttyname, 2)) < 0)
  72                                 continue;
  73                         w->ww_ttyname[_PT] = 't';
  74                         if ((tty = open(w->ww_ttyname, 2)) < 0) {
  75                                 (void) close(w->ww_pty);
  76                                 continue;
  77                         }
  78                         (void) close(tty);
  79                         if (ioctl(w->ww_pty, TIOCPKT, (char *)&on) < 0) {
  80                                 (void) close(w->ww_pty);
  81                                 continue;
  82                         }
  83                         (void) fcntl(w->ww_pty, F_SETFD, 1);
  84                         return 0;
  85                 }
  86         }
  87         w->ww_pty = -1;
  88         wwerrno = WWE_NOPTY;
  89         return -1;
  90 }