xref: /src/lib/libc/stdlib/pty.c

/*	$NetBSD: pty.c,v 1.2.28.1 2014/08/20 00:02:16 tls Exp $	*/

/*-
 * Copyright (c) 2004 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Christos Zoulas.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
__RCSID("$NetBSD: pty.c,v 1.2.28.1 2014/08/20 00:02:16 tls Exp $");
#endif /* LIBC_SCCS and not lint */

#include "namespace.h"
#include <fcntl.h>
#include <string.h>
#include <errno.h>
#include <stdlib.h>
#include <sys/ioctl.h>

int
grantpt(int fildes)
{

	return ioctl(fildes, TIOCGRANTPT, 0);
}

int
/*ARGSUSED*/
unlockpt(int fildes)
{

	return 0;
}

char *
ptsname(int fildes)
{
	static struct ptmget pm;

	if (ioctl(fildes, TIOCPTSNAME, &pm) == -1)
		return NULL;

	return pm.sn;
}

int
ptsname_r(int fildes, char *buf, size_t buflen) {
	struct ptmget pm;

	if (buf == NULL)
		return EINVAL;
	if (ioctl(fildes, TIOCPTSNAME, &pm) == -1)
		return errno;
	if (strlcpy(buf, pm.sn, buflen) > buflen)
		return ERANGE;
	return 0;
}