home *** CD-ROM | disk | FTP | other *** search
- /*
- * Copyright (c) 1983 Regents of the University of California.
- * All rights reserved.
- *
- * This code is derived from software contributed to Berkeley by
- * Edward Wang at The University of California, Berkeley.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
-
- #ifndef lint
- static char sccsid[] = "@(#)wwpty.c 3.19 (Berkeley) 8/12/90";
- #endif /* not lint */
-
- #include "ww.h"
- #if !defined(OLD_TTY) && !defined(TIOCPKT)
- #include <sys/ioctl.h>
- #endif
-
- wwgetpty(w)
- register struct ww *w;
- {
- register char c, *p;
- int tty;
- int on = 1;
- #define PTY "/dev/XtyXX"
- #define _PT 5
- #define _PQRS 8
- #define _0_9 9
-
- (void) strcpy(w->ww_ttyname, PTY);
- for (c = 'p'; c <= 'u'; c++) {
- w->ww_ttyname[_PT] = 'p';
- w->ww_ttyname[_PQRS] = c;
- w->ww_ttyname[_0_9] = '0';
- if (access(w->ww_ttyname, 0) < 0)
- break;
- for (p = "0123456789abcdef"; *p; p++) {
- w->ww_ttyname[_PT] = 'p';
- w->ww_ttyname[_0_9] = *p;
- if ((w->ww_pty = open(w->ww_ttyname, 2)) < 0)
- continue;
- w->ww_ttyname[_PT] = 't';
- if ((tty = open(w->ww_ttyname, 2)) < 0) {
- (void) close(w->ww_pty);
- continue;
- }
- (void) close(tty);
- if (ioctl(w->ww_pty, TIOCPKT, (char *)&on) < 0) {
- (void) close(w->ww_pty);
- continue;
- }
- return 0;
- }
- }
- w->ww_pty = -1;
- wwerrno = WWE_NOPTY;
- return -1;
- }
-