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/*
* Copyright (c) 1988, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)ttyname.c 8.2 (Berkeley) 1/27/94";
#endif /* LIBC_SCCS and not lint */
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "namespace.h"
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <sys/filio.h>
#include <fcntl.h>
#include <dirent.h>
#include <stdlib.h>
#include <termios.h>
#include <unistd.h>
#include <string.h>
#include <paths.h>
#include <pthread.h>
#include "un-namespace.h"
#include "libc_private.h"
static char ttyname_buf[sizeof(_PATH_DEV) + MAXNAMLEN];
static pthread_mutex_t ttyname_lock = PTHREAD_MUTEX_INITIALIZER;
static pthread_key_t ttyname_key;
static int ttyname_init = 0;
char *
ttyname_r(int fd, char *buf, size_t len)
{
struct stat sb;
char *rval;
struct fiodgname_arg fgn;
rval = NULL;
*buf = '\0';
/* Must be a terminal. */
if (!isatty(fd))
return (rval);
/* Must be a character device. */
if (_fstat(fd, &sb) || !S_ISCHR(sb.st_mode))
return (rval);
/* Must have enough room */
if (len <= sizeof(_PATH_DEV))
return (rval);
strcpy(buf, _PATH_DEV);
fgn.len = len - strlen(buf);
fgn.buf = buf + strlen(buf);
if (!_ioctl(fd, FIODGNAME, &fgn))
return(buf);
devname_r(sb.st_rdev, S_IFCHR,
buf + strlen(buf), sizeof(buf) - strlen(buf));
return (buf);
}
char *
ttyname(int fd)
{
char *buf;
if (__isthreaded == 0)
return (ttyname_r(fd, ttyname_buf, sizeof ttyname_buf));
if (ttyname_init == 0) {
_pthread_mutex_lock(&ttyname_lock);
if (ttyname_init == 0) {
if (_pthread_key_create(&ttyname_key, free)) {
_pthread_mutex_unlock(&ttyname_lock);
return (NULL);
}
ttyname_init = 1;
}
_pthread_mutex_unlock(&ttyname_lock);
}
/* Must have thread specific data field to put data */
if ((buf = _pthread_getspecific(ttyname_key)) == NULL) {
if ((buf = malloc(sizeof(_PATH_DEV) + MAXNAMLEN)) != NULL) {
if (_pthread_setspecific(ttyname_key, buf) != 0) {
free(buf);
return (NULL);
}
} else {
return (NULL);
}
}
return (ttyname_r(fd, buf, sizeof(_PATH_DEV) + MAXNAMLEN));
}
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