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