xref: /minix/lib/libc/gen/ttyslot.c (revision 84d9c625)
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
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 #if !defined(__minix)
63 	struct ptmget ptm;
64 #endif /* !defined(__minix) */
65 
66 	setttyent();
67 	for (cnt = 0; cnt < 3; ++cnt) {
68 #if !defined(__minix)
69 		if (ioctl(cnt, TIOCPTSNAME, &ptm) != -1) {
70 			ispty = 1;
71 			name = ptm.sn;
72 		} else if ((name = ttyname(cnt)) != NULL) {
73 #else
74 		if ((name = ttyname(cnt)) != NULL) {
75 #endif /* !defined(__minix) */
76 			ispty = 0;
77 		} else
78 			continue;
79 
80 		if ((p = strstr(name, "/pts/")) != NULL)
81 			++p;
82 		else if ((p = strrchr(name, '/')) != NULL)
83 			++p;
84 		else
85 			p = name;
86 
87 		for (slot = 1; (ttyp = getttyent()) != NULL; ++slot)
88 			if (!strcmp(ttyp->ty_name, p)) {
89 				endttyent();
90 				return slot;
91 			}
92 		break;
93 	}
94 	endttyent();
95 	if (ispty) {
96 		struct stat st;
97 		if (fstat(cnt, &st) == -1)
98 			return 0;
99 		return slot + (int)minor(st.st_rdev) + 1;
100 	}
101 	return 0;
102 }
103