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.
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11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. 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.
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19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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29 * @(#)ttyname.c 8.2 (Berkeley) 1/27/94
30 * $FreeBSD: src/lib/libc/gen/ttyname.c,v 1.24 2007/01/09 00:27:55 imp Exp $
33 #include "namespace.h"
34 #include <sys/types.h>
44 #include <machine/stdint.h>
46 #include <sys/ioctl.h>
47 #include "reentrant.h"
48 #include "un-namespace.h"
50 #include "libc_private.h"
52 #define TTYNAME_DEVFS_COMPAT 1
54 static char ttyname_buf
[sizeof(_PATH_DEV
) + NAME_MAX
];
56 static once_t ttyname_init_once
= ONCE_INITIALIZER
;
57 static thread_key_t ttyname_key
;
58 static int ttyname_keycreated
= 0;
61 ttyname_r(int fd
, char *buf
, size_t len
)
64 struct fiodname_args fa
;
69 /* Must be a valid file descriptor */
72 /* Must be a character device */
73 if (!S_ISCHR(sb
.st_mode
))
75 /* Must be a terminal. */
78 /* Must have enough room */
79 if (len
<= sizeof(_PATH_DEV
))
82 strcpy(buf
, _PATH_DEV
);
86 if (_ioctl(fd
, FIODNAME
, &fa
) == -1) {
87 #ifdef TTYNAME_DEVFS_COMPAT
88 /* If compat mode is set, fall back to old method */
89 devname_r(sb
.st_rdev
, S_IFCHR
, buf
+ used
, len
- used
);
98 ttyname_keycreate(void)
100 ttyname_keycreated
= (thr_keycreate(&ttyname_key
, free
) == 0);
112 if (thr_once(&ttyname_init_once
, ttyname_keycreate
) != 0 ||
115 if ((buf
= thr_getspecific(ttyname_key
)) == NULL
) {
116 if ((buf
= malloc(sizeof ttyname_buf
)) == NULL
)
118 if (thr_setspecific(ttyname_key
, buf
) != 0) {
125 if (((error
= ttyname_r(fd
, buf
, sizeof ttyname_buf
))) != 0) {