2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 1988, 1993
5 * The Regents of the University of California. All rights reserved.
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8 * modification, are permitted provided that the following conditions
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11 * notice, this list of conditions and the following disclaimer.
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19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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32 #include <sys/cdefs.h>
33 __SCCSID("@(#)ttyname.c 8.2 (Berkeley) 1/27/94");
34 #include "namespace.h"
35 #include <sys/types.h>
36 #include <sys/ioctl.h>
37 #include <sys/filio.h>
46 #include "reentrant.h"
47 #include "un-namespace.h"
49 #include "libc_private.h"
51 static char ttyname_buf[sizeof(_PATH_DEV) + MAXNAMLEN];
53 static once_t ttyname_init_once = ONCE_INITIALIZER;
54 static thread_key_t ttyname_key;
55 static int ttyname_keycreated = 0;
58 ttyname_r(int fd, char *buf, size_t len)
62 /* Don't write off the end of a zero-length buffer. */
68 /* Must be a terminal. */
71 /* Must have enough room */
72 if (len <= sizeof(_PATH_DEV))
75 strcpy(buf, _PATH_DEV);
77 if (fdevname_r(fd, buf + used, len - used) == NULL)
78 return (errno == EINVAL ? ERANGE : errno);
83 ttyname_keycreate(void)
85 ttyname_keycreated = (thr_keycreate(&ttyname_key, free) == 0);
96 if (thr_once(&ttyname_init_once, ttyname_keycreate) != 0 ||
99 if ((buf = thr_getspecific(ttyname_key)) == NULL) {
100 if ((buf = malloc(sizeof ttyname_buf)) == NULL)
102 if (thr_setspecific(ttyname_key, buf) != 0) {
109 if (ttyname_r(fd, buf, sizeof ttyname_buf) != 0)