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/* Test whether a file descriptor refers to a terminal. Linux version.
Copyright (C) 1991-2025 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 <termios_internals.h>
/* Return 1 if FD is a terminal, 0 if not. This simply does a
TCGETS2 ioctl into a dummy buffer without parsing the result. */
int
__isatty (int fd)
{
struct termios2 k_termios;
return INLINE_SYSCALL_CALL (ioctl, fd, TCGETS2, &k_termios) == 0;
}
weak_alias (__isatty, isatty)
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