11573Srgrimes/*- 2225897Sed * Copyright (c) 2011 Ed Schouten <ed@FreeBSD.org> 3225897Sed * All rights reserved. 41573Srgrimes * 51573Srgrimes * Redistribution and use in source and binary forms, with or without 61573Srgrimes * modification, are permitted provided that the following conditions 71573Srgrimes * are met: 81573Srgrimes * 1. Redistributions of source code must retain the above copyright 91573Srgrimes * notice, this list of conditions and the following disclaimer. 101573Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 111573Srgrimes * notice, this list of conditions and the following disclaimer in the 121573Srgrimes * documentation and/or other materials provided with the distribution. 131573Srgrimes * 14225897Sed * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 151573Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 161573Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17225897Sed * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 181573Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 191573Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 201573Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 211573Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 221573Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 231573Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 241573Srgrimes * SUCH DAMAGE. 251573Srgrimes */ 261573Srgrimes 2792986Sobrien#include <sys/cdefs.h> 2892986Sobrien__FBSDID("$FreeBSD$"); 291573Srgrimes 30225897Sed#include <sys/param.h> 31225897Sed#include <sys/stat.h> 32225897Sed#include <sys/sysctl.h> 33225897Sed 34225897Sed#include <errno.h> 35225897Sed#include <paths.h> 361573Srgrimes#include <stdio.h> 371573Srgrimes#include <string.h> 381573Srgrimes 39225897Sed#define LEN_PATH_DEV (sizeof(_PATH_DEV) - 1) 40225897Sed 411573Srgrimeschar * 4253863Swesctermid(char *s) 431573Srgrimes{ 44225897Sed static char def[sizeof(_PATH_DEV) + SPECNAMELEN]; 45225897Sed struct stat sb; 46225897Sed size_t dlen; 47225897Sed int sverrno; 481573Srgrimes 49225897Sed if (s == NULL) { 50225897Sed s = def; 51225897Sed dlen = sizeof(def) - LEN_PATH_DEV; 52225897Sed } else 53225897Sed dlen = L_ctermid - LEN_PATH_DEV; 54225897Sed strcpy(s, _PATH_TTY); 55225897Sed 56225897Sed /* Attempt to perform a lookup of the actual TTY pathname. */ 57225897Sed sverrno = errno; 58225897Sed if (stat(_PATH_TTY, &sb) == 0 && S_ISCHR(sb.st_mode)) 59225897Sed (void)sysctlbyname("kern.devname", s + LEN_PATH_DEV, 60225897Sed &dlen, &sb.st_rdev, sizeof(sb.st_rdev)); 61225897Sed errno = sverrno; 62225897Sed return (s); 631573Srgrimes} 6453863Swes 6553863Sweschar * 6653863Swesctermid_r(char *s) 6753863Swes{ 68225897Sed 69225897Sed return (s != NULL ? ctermid(s) : NULL); 7053863Swes} 71