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/* Copyright (C) 1991,92,93,96,97,98,2000,2002 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 <stddef.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#include <termios.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
/* Static buffer in `ttyname'. */
libc_freeres_ptr (static char *ttyname_buf);
static const char dev[] = "/dev";
/* Return the pathname of the terminal FD is open on, or NULL on errors.
The returned storage is good only until the next call to this function. */
char *
ttyname (int fd)
{
static size_t buflen;
struct fiodgname_arg fgn;
/* 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 NULL;
if (buflen == 0)
{
buflen = 4095;
ttyname_buf = (char *) malloc (buflen + 1);
if (ttyname_buf == NULL)
{
buflen = 0;
return NULL;
}
}
/* Prepare the result buffer. */
memcpy (ttyname_buf, dev, sizeof (dev) - 1);
ttyname_buf[sizeof (dev) - 1] = '/';
fgn.buf = ttyname_buf + sizeof (dev);
fgn.len = buflen - sizeof (dev);
if (__ioctl(fd, FIODGNAME, &fgn) == -1)
{
return NULL;
}
return ttyname_buf;
}
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