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      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 	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