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/* Copyright (C) 1991-2021 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, see
<https://www.gnu.org/licenses/>. */
#include <errno.h>
#include <limits.h>
#include <termios.h>
#include <stdlib.h>
#include "ttyname.h"
static char *ttyname_buf = NULL;
libc_freeres_fn (free_mem)
{
free (ttyname_buf);
}
/* 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)
{
/* isatty check, tcgetattr is used because it sets the correct
errno (EBADF resp. ENOTTY) on error. Fast error path to avoid the
allocation */
struct termios term;
if (__glibc_unlikely (__tcgetattr (fd, &term) < 0))
return NULL;
if (ttyname_buf == NULL)
{
ttyname_buf = malloc (PATH_MAX);
if (ttyname_buf == NULL)
return NULL;
}
int result = __ttyname_r (fd, ttyname_buf, PATH_MAX);
if (result != 0)
{
__set_errno (result);
return NULL;
}
return ttyname_buf;
}
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