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40 lines
1.2 KiB
C
40 lines
1.2 KiB
C
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/* Copyright (C) 1991, 1995 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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#include <ansidecl.h>
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#include <errno.h>
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#include <unistd.h>
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#include <sys/ioctl.h>
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/* Return 1 if FD is a terminal, 0 if not. */
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int
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DEFUN(__isatty, (fd), int fd)
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{
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int save;
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int is_tty;
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struct sgttyb term;
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save = errno;
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is_tty = __ioctl (fd, TIOCGETP, &term) == 0;
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errno = save;
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return is_tty;
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}
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weak_alias (__isatty, isatty)
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