newlib-cygwin/newlib/libc/unix/ttyname.c

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/*
* Copyright (c) 1988 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 5.10 (Berkeley) 5/6/91";
#endif /* LIBC_SCCS and not lint */
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <dirent.h>
#include <termios.h>
#include <unistd.h>
#include <string.h>
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#include <paths.h>
#include <_syslist.h>
static char buf[sizeof (_PATH_DEV) + MAXNAMLEN] = _PATH_DEV;
char *
ttyname (fd)
int fd;
{
struct stat sb;
struct termios tty;
struct dirent *dirp;
DIR *dp;
struct stat dsb;
/* Must be a terminal. */
if (tcgetattr (fd, &tty) < 0)
return NULL;
/* Must be a character device. */
if (_fstat (fd, &sb) || !S_ISCHR (sb.st_mode))
return NULL;
if ((dp = _opendir (_PATH_DEV)) == NULL)
return NULL;
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while ((dirp = _readdir (dp)) != NULL)
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{
if (dirp->d_ino != sb.st_ino)
continue;
strcpy (buf + sizeof (_PATH_DEV) - 1, dirp->d_name);
if (stat (buf, &dsb) || sb.st_dev != dsb.st_dev ||
sb.st_ino != dsb.st_ino)
continue;
(void) _closedir (dp);
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return buf;
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}
(void) _closedir (dp);
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return NULL;
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}