1 /* $NetBSD: ttyslot.c,v 1.13 2009/01/11 02:46:27 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
35 static char sccsid[] = "@(#)ttyslot.c 8.1 (Berkeley) 6/4/93";
36 #else
37 __RCSID("$NetBSD: ttyslot.c,v 1.13 2009/01/11 02:46:27 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
__weak_alias(ttyslot,_ttyslot)51 __weak_alias(ttyslot,_ttyslot)
52 #endif
53
54 int
55 ttyslot(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