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/* Copyright (C) 1991,92,93,95,96,97,98,2004 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <errno.h>
#include <stddef.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#include <termios.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
static const char dev[] = "/dev";
/* Store at most BUFLEN character of the pathname of the terminal FD is
open on in BUF. Return 0 on success, otherwise an error number. */
int
__ttyname_r (int fd, char *buf, size_t buflen)
{
int ret;
struct fiodgname_arg fgn;
/* Test for the absolute minimal size. This makes life easier inside
the loop. */
if (!buf)
{
__set_errno (EINVAL);
return EINVAL;
}
if (buflen < (int) (sizeof (dev) + 1))
{
__set_errno (ERANGE);
return ERANGE;
}
/* isatty check, tcgetattr is used because it sets the correct
errno (EBADF resp. ENOTTY) on error. */
struct termios term;
if (__builtin_expect (__tcgetattr (fd, &term) < 0, 0))
return errno;
/* Prepare the result buffer. */
memcpy (buf, dev, sizeof (dev) - 1);
buf[sizeof (dev) - 1] = '/';
fgn.buf = buf + sizeof (dev);
fgn.len = buflen - sizeof (dev);
ret = __ioctl(fd, FIODGNAME, &fgn);
if (ret == -1)
{
__set_errno (EBADF);
return EBADF;
}
return 0;
}
weak_alias (__ttyname_r, ttyname_r)
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