1/*	$NetBSD: ttyslot.c,v 1.12.34.1 2008/11/08 21:45:38 christos Exp $	*/
2
3/*
4 * Copyright (c) 1988, 1993
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 *    may be used to endorse or promote products derived from this software
17 *    without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32#include <sys/cdefs.h>
33#if defined(LIBC_SCCS) && !defined(lint)
34#if 0
35static char sccsid[] = "@(#)ttyslot.c	8.1 (Berkeley) 6/4/93";
36#else
37__RCSID("$NetBSD: ttyslot.c,v 1.12.34.1 2008/11/08 21:45:38 christos Exp $");
38#endif
39#endif /* LIBC_SCCS and not lint */
40
41#include "namespace.h"
42#include <ttyent.h>
43#include <stdio.h>
44#include <stdlib.h>
45#include <string.h>
46#include <unistd.h>
47#include <sys/ioctl.h>
48#include <sys/stat.h>
49
50#ifdef __weak_alias
51__weak_alias(ttyslot,_ttyslot)
52#endif
53
54int
55ttyslot(void)
56{
57	struct ttyent *ttyp;
58	int slot = 0, ispty = 0;
59	char *p;
60	int cnt;
61	char *name;
62	struct ptmget ptm;
63
64	setttyent();
65	for (cnt = 0; cnt < 3; ++cnt) {
66		if (ioctl(cnt, TIOCPTSNAME, &ptm) != -1) {
67			ispty = 1;
68			name = ptm.sn;
69		} else if ((name = ttyname(cnt)) != NULL) {
70			ispty = 0;
71		} else
72			continue;
73
74		if ((p = strstr(name, "/pts/")) != NULL)
75			++p;
76		else if ((p = strrchr(name, '/')) != NULL)
77			++p;
78		else
79			p = name;
80
81		for (slot = 1; (ttyp = getttyent()) != NULL; ++slot)
82			if (!strcmp(ttyp->ty_name, p)) {
83				endttyent();
84				return slot;
85			}
86		break;
87	}
88	endttyent();
89	if (ispty) {
90		struct stat st;
91		if (fstat(cnt, &st) == -1)
92			return 0;
93		return slot + (int)minor(st.st_rdev) + 1;
94	}
95	return 0;
96}
97