1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2011 Ed Schouten <ed@FreeBSD.org> 5 * 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 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 #include <sys/param.h> 31 #include <sys/stat.h> 32 #include <sys/sysctl.h> 33 34 #include <errno.h> 35 #include <paths.h> 36 #include <stdio.h> 37 #include <string.h> 38 39 #define LEN_PATH_DEV (sizeof(_PATH_DEV) - 1) 40 41 char * 42 ctermid(char *s) 43 { 44 static char def[sizeof(_PATH_DEV) + SPECNAMELEN]; 45 struct stat sb; 46 size_t dlen; 47 int sverrno; 48 49 if (s == NULL) { 50 s = def; 51 dlen = sizeof(def) - LEN_PATH_DEV; 52 } else 53 dlen = L_ctermid - LEN_PATH_DEV; 54 strcpy(s, _PATH_TTY); 55 56 /* Attempt to perform a lookup of the actual TTY pathname. */ 57 sverrno = errno; 58 if (stat(_PATH_TTY, &sb) == 0 && S_ISCHR(sb.st_mode)) 59 (void)sysctlbyname("kern.devname", s + LEN_PATH_DEV, 60 &dlen, &sb.st_rdev, sizeof(sb.st_rdev)); 61 errno = sverrno; 62 return (s); 63 } 64 65 char * 66 ctermid_r(char *s) 67 { 68 69 return (s != NULL ? ctermid(s) : NULL); 70 } 71