1 /*- 2 * Copyright (c) 2011 Ed Schouten <ed@FreeBSD.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27 #include <sys/cdefs.h> 28 __FBSDID("$FreeBSD$"); 29 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