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/param.h>
30 #include <sys/stat.h>
31 #include <sys/sysctl.h>
32
33 #include <errno.h>
34 #include <paths.h>
35 #include <stdio.h>
36 #include <string.h>
37
38 #define LEN_PATH_DEV (sizeof(_PATH_DEV) - 1)
39
40 char *
ctermid(char * s)41 ctermid(char *s)
42 {
43 static char def[sizeof(_PATH_DEV) + SPECNAMELEN];
44 struct stat sb;
45 size_t dlen;
46 int sverrno;
47
48 if (s == NULL) {
49 s = def;
50 dlen = sizeof(def) - LEN_PATH_DEV;
51 } else
52 dlen = L_ctermid - LEN_PATH_DEV;
53 strcpy(s, _PATH_TTY);
54
55 /* Attempt to perform a lookup of the actual TTY pathname. */
56 sverrno = errno;
57 if (stat(_PATH_TTY, &sb) == 0 && S_ISCHR(sb.st_mode))
58 (void)sysctlbyname("kern.devname", s + LEN_PATH_DEV,
59 &dlen, &sb.st_rdev, sizeof(sb.st_rdev));
60 errno = sverrno;
61 return (s);
62 }
63
64 char *
ctermid_r(char * s)65 ctermid_r(char *s)
66 {
67
68 return (s != NULL ? ctermid(s) : NULL);
69 }
70