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      1 /*	$NetBSD: pty.c,v 1.4 2014/01/08 02:17:30 christos Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2004 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Christos Zoulas.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 #if defined(LIBC_SCCS) && !defined(lint)
     34 __RCSID("$NetBSD: pty.c,v 1.4 2014/01/08 02:17:30 christos Exp $");
     35 #endif /* LIBC_SCCS and not lint */
     36 
     37 #include "namespace.h"
     38 #include <fcntl.h>
     39 #include <string.h>
     40 #include <errno.h>
     41 #include <stdlib.h>
     42 #include <sys/ioctl.h>
     43 
     44 int
     45 grantpt(int fildes)
     46 {
     47 
     48 	return ioctl(fildes, TIOCGRANTPT, 0);
     49 }
     50 
     51 int
     52 /*ARGSUSED*/
     53 unlockpt(int fildes)
     54 {
     55 
     56 	return 0;
     57 }
     58 
     59 char *
     60 ptsname(int fildes)
     61 {
     62 	static struct ptmget pm;
     63 
     64 	if (ioctl(fildes, TIOCPTSNAME, &pm) == -1)
     65 		return NULL;
     66 
     67 	return pm.sn;
     68 }
     69 
     70 int
     71 ptsname_r(int fildes, char *buf, size_t buflen) {
     72 	struct ptmget pm;
     73 
     74 	if (buf == NULL)
     75 		return EINVAL;
     76 	if (ioctl(fildes, TIOCPTSNAME, &pm) == -1)
     77 		return errno;
     78 	if (strlcpy(buf, pm.sn, buflen) > buflen)
     79 		return ERANGE;
     80 	return 0;
     81 }
     82