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