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

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#ifndef _NO_TTYNAME
/*
* 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.
* 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.
*/
#include "ttyname.h"
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <dirent.h>
#include <unistd.h>
#include <string.h>
#include <paths.h>
#include <_syslist.h>
#include <errno.h>
/*
* ttyname_r() - POSIX 1003.1b 4.7.2 - Determine Terminal Device Name
*/
int
_DEFUN( ttyname_r,(fd, name, namesize),
int fd _AND
char *name _AND
size_t namesize)
{
struct stat sb;
struct dirent *dirp;
DIR *dp;
struct stat dsb;
char buf[TTYNAME_BUFSIZE];
/* Must be a terminal. */
if (!isatty(fd))
return ENOTTY;
/* Must be a character device. */
if (fstat (fd, &sb) || !S_ISCHR (sb.st_mode))
return ENOTTY;
if ((dp = opendir (_PATH_DEV)) == NULL)
return EBADF;
strcpy(buf, _PATH_DEV);
while ((dirp = readdir (dp)) != NULL)
{
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);
if(strlen(buf) < namesize) /* < to account for terminating null */
{
strcpy(name, buf);
return 0;
}
else
{
return ERANGE;
}
}
(void) closedir (dp);
return EBADF;
}
#endif /* !_NO_TTYNAME */