2 * Copyright (c) 1988, 1993
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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 * 4. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 #if defined(LIBC_SCCS) && !defined(lint)
31 static char sccsid[] = "@(#)ttyname.c 8.2 (Berkeley) 1/27/94";
32 #endif /* LIBC_SCCS and not lint */
33 #include <sys/cdefs.h>
34 __FBSDID("$FreeBSD$");
36 #include "namespace.h"
37 #include <sys/types.h>
38 #include <sys/ioctl.h>
39 #include <sys/filio.h>
48 #include "reentrant.h"
49 #include "un-namespace.h"
51 #include "libc_private.h"
53 static char ttyname_buf[sizeof(_PATH_DEV) + MAXNAMLEN];
55 static once_t ttyname_init_once = ONCE_INITIALIZER;
56 static thread_key_t ttyname_key;
57 static int ttyname_keycreated = 0;
60 ttyname_r(int fd, char *buf, size_t len)
66 /* Must be a terminal. */
69 /* Must have enough room */
70 if (len <= sizeof(_PATH_DEV))
73 strcpy(buf, _PATH_DEV);
75 if (fdevname_r(fd, buf + used, len - used) == NULL)
76 return (errno == EINVAL ? ERANGE : errno);
81 ttyname_keycreate(void)
83 ttyname_keycreated = (thr_keycreate(&ttyname_key, free) == 0);
94 if (thr_once(&ttyname_init_once, ttyname_keycreate) != 0 ||
97 if ((buf = thr_getspecific(ttyname_key)) == NULL) {
98 if ((buf = malloc(sizeof ttyname_buf)) == NULL)
100 if (thr_setspecific(ttyname_key, buf) != 0) {
107 if (ttyname_r(fd, buf, sizeof ttyname_buf) != 0)